Build a dual-mode voice agent in Microsoft Foundry with native subagents
Voice agents are changing how companies interact with customers. From service questions to technical support, the expectation is the same: a natural conversation that leads to useful, reliable answers. But responding quickly and resolving a complex request are not always the same task. Some questions can be answered directly. Others require information from backend systems, specialized analysis, or several steps to determine what should happen next. The challenge is to support that deeper work without putting the conversation on hold, or giving an answer before the necessary information is available. In this blog, I will walk through a dual-mode voice-agent pattern in Microsoft Foundry. A frontline agent manages the real-time conversation, while a backend agent handles specialized work. We will explore how these responsibilities work together, how the frontline can continue interacting while backend processing runs, and how to configure and verify the experience. The pattern is broadly applicable, with particular relevance to telecom customer service and support. You will learn how to: Separate real-time conversation from specialized backend work. Configure a native voice subagent Understand how Voice Agents build on Voice Live Test delayed responses, interruptions, missing information, and backend failures. How voice agents work Before we look at our full workflow. Lets have a look at the voice experience in Microsoft Foundry. A voice application needs to carry audio, manage the conversation, and connect that conversation to useful information or actions. Those responsibilities work together, but they are not the same layer. A browser or contact-center connector handles audio capture and playback The voice runtime manages streaming and turn-taking Instructions, knowledge, and authorized tools determine what the agent can say and do. In Microsoft Foundry, Voice Live provides the real-time speech foundation. Voice Agents build on it with a named, versioned agent definition and capabilities such as tools, tracing, and evaluation. The diagram below shows the underlying voice pipeline. Audio arrives from the client Before anything else, Voice Live cleans up that audio. It uses conversational enhancements that can reduce background noise and echo and help detect when a speaker has finished a turn. The exact combination depends on the selected model, pipeline, and audio settings; not every session uses all the processing stages shown The conversation can then either follow a native speech-to-speech path. A model in the GPT Realtime family processes spoken input directly and produces a spoken response. Supported configurations can also use Azure Speech voices for output, so choosing a realtime model does not mean we must use its native output voice. Alternatively, a cascaded pipeline converts speech to text, sends that text to a language model or agent, and synthesizes the response as speech. This separates the recognition, conversation model, and voice choices. Voice Live can manage that pipeline without us writing the streaming and turn-taking loop ourselves. In either path, useful answers may also require knowledge sources or external tools. These connections give the agent access to information and actions beyond the conversation itself. Configure the required permissions and safety controls for the selected model and application; a tool or content-safety box in the diagram is not a substitute for those decisions. On the return path, speech streams back to the client for playback. Where supported, Azure Speech provides standard and HD voices, with custom voice subject to access requirements. These choices describe how the spoken conversation runs. The dual-mode pattern adds a different separation: the frontline owns that conversation, while a backend agent handles a focused task. It does not require two speech-to-speech models, and the backend does not speak directly to the caller. How the frontline and backend work together To keep the conversation responsive while specialized work runs, we separate the caller-facing interaction from the backend task. Each agent has a clear responsibility: The frontline agent is responsible for the interaction. It listens, takes turns, answers supported questions, and explains what happens next. The backend agent has a different job: work through a focused task, such as reviewing incident evidence or recommending a troubleshooting sequence. The important part is that delegation does not have to take the caller out of the conversation. The frontline can remain active while the backend works. In the native subagent pattern, this behavior is configured through the agent definitions, instructions, and response policy rather than a separate routing model The following diagram shows how those responsibilities fit together: The voice client captures and streams the caller’s audio: The client connects the caller to the frontline voice agent, sends microphone audio, and plays returned speech. It can also display transcripts and runtime events. The client can send audio and receive events concurrently. The frontline voice agent decides whether to answer directly or delegate: The frontline owns the live conversation. It handles straightforward requests within its configured knowledge and permissions without invoking the backend. When a request needs specialized work, the frontline uses its instructions and the configured subagent’s description to determine when to delegate. Direct answers return through the voice client without a backend invocation. Foundry invokes the configured backend subagent. The voice agent’s subagent_config references a backend in the same Foundry project by name. Foundry invokes that backend for the delegated task. The frontline retains ownership of the voice conversation; the caller is not transferred to the backend. The backend performs the task and uses its tools. A prompt or hosted agent follows its own instructions and can retrieve data, call APIs, or execute supported functions. Access to service information, incident records, or diagnostics must be explicitly configured and authorized. Meanwhile, the frontline keeps the voice interaction active. Its response_policy controls an immediate acknowledgment, gap-filling speech, and supported progress updates. The basic sample enables only immediate_ack=True; additional behavior requires configuration. The frontline can receive further caller input, but it must not invent backend findings while waiting. Further caller input does not automatically update an in-flight backend task. Results and supported progress return through Foundry. The backend returns its output to the frontline through managed delegation. Where supported and enabled, progress can also inform the conversation before completion. The diagram’s return arrow does not mean every backend automatically streams intermediate findings. The frontline presents the result to the caller. Following its instructions, it explains the findings, communicates uncertainty, and identifies appropriate next actions. Speech streams back through the client for playback. The backend does not speak directly to the caller, and its output is not necessarily identical to the spoken response. Note: The GPT Live samples demonstrate an alternative implementation of the conversation/backend split. They use VoiceAgentLiveDefinition and live.connect(), with direct Responses or managed prompt-agent delegation. The design goal is responsiveness without sacrificing depth. A fast acknowledgment improves perceived waiting time; it does not shorten the underlying investigation or guarantee an accurate answer. Measure conversational responsiveness and backend task quality separately. Decide when the frontline should ask for help With the flow in place, the next question is when the frontline should ask for help. Define clear boundaries in the frontline agent’s instructions and the subagent’s capability description. Rule 1: Answer directly when the frontline has sufficient grounded information and permission to respond. Rule 2: Delegate when the backend owns the required capability. This might include combining information from several systems, assessing service impact, investigating symptoms, or developing a troubleshooting plan. Rule 3: Escalate when the request exceeds the automated workflow’s boundaries. Define what should happen when an action requires human approval, evidence remains insufficient, or a tool failure prevents progress. Implement and test the human-handoff or failure path; instructions alone do not provide it. From the caller’s perspective, this should feel like one conversation, not a handoff between agents. The frontline listens, clarifies the request, and brings in specialized help when needed. The caller does not need to understand which backend agent or tool is doing the work. When backend processing begins, an enabled acknowledgment can make that transition clear: “Let me check that for you.” If gap-filling speech or supported progress updates are configured, the frontline can keep the caller informed while the task runs. Those updates should reflect what is actually known, without implying that a check has completed or a result has been confirmed. Once the backend returns, the frontline explains the outcome in language suited to the conversation. That might be a confirmed finding, a recommended next step, or a clear statement that more information is needed. The goal is not to fill every pause with speech. It is to keep the caller oriented while specialized work happens in the background, and to make the eventual answer useful, understandable, and grounded in evidence. Build the native voice-subagent workflow Now that we have defined the conversation flow, let’s configure the agents behind it. We will use native voice subagents throughout this walkthrough: a VoiceAgentDefinition for the frontline, a prompt agent for the backend, and subagent_config to connect them. Voice subagents are currently in preview. Microsoft does not recommend features in preview for production workloads. Step 1: Give the backend one focused responsibility Start with the work the frontline should delegate. A useful backend has a clear responsibility. The subagent can be a Foundry prompt agent or a hosted agent in the same project. For our example here we will create a prompt agent that can analyze information supplied to it. It can be connected to knowledge bases and different tools to help. You can also create a subagent in the Microsoft Foundry portal or deploy a code-based hosted agent. Keep the instructions specific to the backend’s actual capabilities. If it can only analyze supplied information, say so. If you later add an incident lookup, update the instructions and capability description to reflect that change. Instructions guide model behavior; they do not enforce permissions or guarantee an output schema. Restrict access in the tools and services themselves, and validate any structured fields your application relies on. Separate read-only investigation from actions that change a customer account or service. Step 2: Connect the backend to the frontline Next, we can create the caller-facing voice-based agent. We can create this using the SDK. In its instructions we should explain when to delegate to the backend agent and we should add the backend agent to its subagent_config. In the subagent_config, you identify the backend agent by name and describe when the voice-based agent should delegate a request to it in the agent_capabilities, which describes the specialist’s responsibility. You can use the following code to spin up such an agent (Also see: Use a subagent in a Voice-based agent - Microsoft Foundry | Microsoft Learn) import os from azure.ai.projects import AIProjectClient from azure.ai.projects.models import ( RealtimeAudioFormatsAudioPcm, VoiceAgentAudioConfig, VoiceAgentAudioInputConfig, VoiceAgentAudioOutputConfig, VoiceAgentDefinition, VoiceAgentInputTranscription, VoiceAgentServerVadTurnDetection, VoiceAgentSubagent, VoiceAgentSubagentConfig, VoiceAgentSubagentResponsePolicy, ) from azure.identity import DefaultAzureCredential endpoint = os.environ["FOUNDRY_PROJECT_ENDPOINT"] model = os.environ.get("FOUNDRY_VOICE_MODEL", "gpt-realtime-2.1") definition = VoiceAgentDefinition( model_type="managed", model=model, instructions=( "You are a real-time customer support assistant for service incidents. " "Handle straightforward factual and support-process questions directly. " "For complex troubleshooting, SLA-risk triage, root-cause hypotheses, " "or multi-step remediation planning, call forward_to_subagent for " "the configured telco support agent. " "After the subagent returns, provide a concise, customer-safe summary " "and next actions. " "Do not present uncertain reasoning as confirmed fact." ), store=True, output_modalities=["audio"], audio=VoiceAgentAudioConfig( input=VoiceAgentAudioInputConfig( format=RealtimeAudioFormatsAudioPcm(rate=24000), turn_detection=VoiceAgentServerVadTurnDetection( threshold=0.5, prefix_padding_ms=300, silence_duration_ms=1000, ), transcription=VoiceAgentInputTranscription( model="azure-speech", ), ), output=VoiceAgentAudioOutputConfig( format=RealtimeAudioFormatsAudioPcm(rate=24000), voice="en-US-JennyNeural", voice_type="azure-standard", ), ), subagent_config=VoiceAgentSubagentConfig( subagents=[ VoiceAgentSubagent( agent_name="[BACKEND AGENT NAME]", agent_capabilities=( "Performs deeper SLA-risk triage and troubleshooting " "reasoning, including structured cause hypotheses " "and remediation planning." ), response_policy=VoiceAgentSubagentResponsePolicy( immediate_ack=True, ), ) ], ), ) with ( DefaultAzureCredential() as credential, AIProjectClient( endpoint=endpoint, credential=credential, allow_preview=True, ) as project_client, ): voice_agent = project_client.agents.create_version( agent_name="frontline-voice-agent", definition=definition, description="Voice frontline with subagent delegation", ) print( f"Created voice agent '{voice_agent.name}', " f"version {voice_agent.version}" ) While you currently can't link these subagents through the portal You can see the subagents linked and its instructions in the portal by clicking on the YAML button. Step 3: Configure what the caller hears while waiting With the basic connection in place, we can decide how the frontline should support the caller during backend work. Use the optional response_policy object to control what the voice agent says while it waits for a subagent: immediate_ack: Specifies whether the voice agent immediately acknowledges that it forwarded the request. ack_instructions Provides instructions for generating the immediate acknowledgment. enable_delta_progress Emits progress incrementally instead of waiting for the subagent invocation to finish. The default is false. gap_filling_interval Sets the period without subagent content or user input before a gap-filling response. Use a value from 5 through 120 seconds. gap_filling_instructions Provides instructions for speech generated while the voice agent waits for progress. progress_instructions Provides instructions for summarizing streamed subagent progress as speech. progress_update_interval Sets the minimum time between spoken progress updates. Use a value from 5 through 300 seconds. Step 4: Start a conversation with the voice agent With the frontline and its subagent configured, we can now test the spoken experience. The quickest starting point is the Foundry playground: open the project containing both agents, go to Build → Agents, select frontline-voice-agent, and open it in the playground. Start a voice session and allow microphone access. This tests the saved agent configuration without building a local audio client. For a custom application, we can use the shared native microphone client linked here (Native voice client: dependencies, launch commands, and event handling) or the complete client in the Microsoft Learn walkthrough. Configure it with the same Foundry project endpoint and the name created in Step 2: frontline-voice-agent. The client connects through beta.voice_agents.realtime.connect(), sends microphone audio, and receives speech and events concurrently. The example uses 24 kHz PCM audio and plays the returned audio chunks as they arrive. Follow the setup and readiness sequence of the client we choose rather than combining snippets from different clients. Voice activity detection identifies speech boundaries; the frontline instructions and subagent configuration still determine when to delegate. Start with a general support question, then ask for analysis that should use the backend. Check the execution evidence as well as the spoken answer: an acknowledgment alone does not prove that the subagent ran. In our current configuration, only immediate_ack is enabled, so additional gap filling or progress narration should not be assumed. Use headphones to prevent speaker audio from feeding back into the microphone. Then introduce a delayed response, a caller correction, missing evidence, and a backend failure. Check how the frontline responds and what the execution trace shows. Test interruptions separately: stopping audio playback does not prove that the backend task was canceled. From a microphone to a contact-center call The microphone client helps us validate the agent. Connecting it to a contact center adds another layer: a channel integration that bridges call audio and call-control events to the voice runtime. The division between frontline and backend remains useful, but a working local conversation does not automatically provide telephony routing or human transfer. The Azure-Samples Call Center Voice Agent Accelerator documents browser testing and multiple telephony providers, including Genesys Cloud, Azure Communication Services, and Twilio. It provides a reference for the channel-integration layer. There are also call-center-specific accelerators e.g. This Genesys Voice Live Connector sample. This integration option uses Genesys Cloud AudioConnector and a connector service between Genesys and Azure Voice Live. The connector handles the channel protocol and audio conversion; the agent handles the conversation and its configured tools. Conclusion A dual-mode voice agent separates responsibilities that operate on different timelines. The frontline keeps the conversation clear and responsive; the backend performs specialized work. Native subagent delegation connects them without handing the caller over to another speaking agent. The value is not constant speech or an instant answer to every request. It is an interaction that stays understandable while the necessary work happens, then delivers a response grounded in what that work actually established. Next Steps Ready to go deeper? Use a subagent in a Voice-based agent (preview) – Follow the end-to-end walkthrough to create a backend subagent, configure delegation, and test the spoken experience. Configure a voice agent – Explore model selection, audio settings, turn detection, voices, and agent behavior. Native voice-subagent samples – Explore working examples that connect a frontline voice agent to prompt or hosted backend agents. Voice Live overview – Learn about the underlying speech capabilities, supported models, and regional availability. Genesys Cloud Voice Live Connector – Explore a sample audio bridge between Genesys Cloud and Azure Voice Live, with a simulator for local testing. Call Center Voice Agent Accelerator – Explore deployment guidance and reference integrations for browser-based conversations and supported telephony providers.Native real-time multilingual transcription is now generally available, and faster
In July, real-time transcription went multilingual for the first time. multilingual post-stream refinement entered public preview, so a single live session could recognize multiple languages, including switches mid-conversation, without knowing the language in advance. Today, multilingual post-stream refinement is generally available in Azure Speech, part of Microsoft Foundry. It also has a new engine. Instead of running a second recognition pass in parallel and waiting for it to finish, multilingual post-stream refinement now runs on an LLM Speech streaming model. The result is refined final transcripts that arrive much sooner. What’s new Generally available: Multilingual real-time transcription, with code-switching and no locale preselection, is ready for production. Faster final results: The streaming model removes the wait for a separate second pass. Final results typically arrive in around 100 milliseconds. Phrase lists: Bias recognition toward product names, people, and domain terms in multilingual sessions. This was the most requested capability from the preview. Each phrase list can have up to 200 phrases and 3,200 characters. 61 multilingual locales: Up from 29 at preview. Diarization included: Multilingual transcripts still show who said what. Why the new architecture matters Partial and final results do different jobs. Partial results drive live captions and voice-agent turn-taking. Final results feed storage, analytics, search, summarization, and downstream AI. In preview, multilingual post-stream refinement paired a real-time recognizer with a second, non-streaming recognition pass that refined each final result with broader audio context. That improved accuracy, but applications had to wait for the second pass before the refined final arrived. Multilingual post-stream refinement now runs natively on an LLM Speech streaming model inside the real-time service, so refined finals arrive without that extra wait. The integration doesn’t change. If you already use multilingual post-stream refinement, you get the new engine with no code changes. This update applies to real-time speech to text through the Speech SDK. If the player doesn't load, open the video in a new window: Open video Get started Enable Post-Stream Refinement with open-range language detection, then add a phrase list if you need it: Multilingual Post-Stream Refinement requires Speech SDK 1.50 or later. import azure.cognitiveservices.speech as speechsdk import time ENABLE_LID = False done = False speech_config = speechsdk.SpeechConfig(subscription="YourSpeechKey", endpoint="YourSpeechEndpoint") # Enable Multichannel processing speech_config.set_property(speechsdk.PropertyId.Speech_EnableMultiChannelProcessing, "true") # Optional: identify the language on each channel auto_detect_config = None if ENABLE_LID: speech_config.set_property(speechsdk.PropertyId.SpeechServiceConnection_LanguageIdMode, "Continuous") auto_detect_config = speechsdk.languageconfig.AutoDetectSourceLanguageConfig(languages=["en-US", "es-MX"]) else: speech_config.speech_recognition_language = "en-US" audio_config = speechsdk.AudioConfig(filename="stereo.wav") speech_recognizer = speechsdk.SpeechRecognizer( speech_config=speech_config, auto_detect_source_language_config=auto_detect_config, audio_config=audio_config, ) # Print Multichannel results def recognized_cb(evt: speechsdk.SpeechRecognitionEventArgs) -> None: if evt.result.reason == speechsdk.ResultReason.RecognizedSpeech: label = f"channel {evt.result.channel}" if ENABLE_LID: label += f" | {speechsdk.AutoDetectSourceLanguageResult(evt.result).language}" print(f"RECOGNIZED ({label}): {evt.result.text}") def stop_cb(evt: speechsdk.SessionEventArgs) -> None: global done done = True speech_recognizer.recognized.connect(recognized_cb) speech_recognizer.session_stopped.connect(stop_cb) speech_recognizer.canceled.connect(stop_cb) speech_recognizer.start_continuous_recognition() try: while not done: time.sleep(0.5) finally: speech_recognizer.stop_continuous_recognition() Tip: For the lowest final-result latency in voice-agent scenarios, commit results explicitly when your application detects the end of a turn, instead of relying only on the service’s silence timeout. What else: more languages for monolingual post-stream refinement This release also expands monolingual post-stream refinement, for sessions where you know the language up front. It now supports 148 locales, up from 29, which matches fast transcription coverage. Monolingual post-stream refinement keeps its existing design, a second recognition pass that runs in parallel with real-time streaming. For the full list, see Speech to text language support. Which mode should I use? Your scenario Use Why Language unknown up front, or speakers switch languages Multilingual post-stream refinement low latency final results, open-range detection, code-switching, 61 locales Known single language, broadest locale coverage Monolingual post-stream refinement 148 locale coverage Designed for global, real-time workloads Global contact centers, where callers start or continue in different languages. Voice agents that must handle code-switching without restarting the session, and recognize product and customer names with phrase lists. International meetings, webinars, and live captioning. Travel, automotive, media, and consumer apps serving many markets. Availability Multilingual post-stream refinement is available in six regions: Central India, East US, North Europe, Southeast Asia, West US, and West US 2. For complete locale and region lists, see Speech to text language support and Supported regions for Azure Speech. Get started today Read the documentation: Multilingual post-stream refinement Phrase lists: Improve recognition accuracy with phrase list Check locale and region support: Speech to text language support and Supported regions for Azure Speech. Azure Support: File a support request through the Azure portal GitHub: Open issues on the Azure Speech SDK samples repositoryFoundry Toolbox Lifecycle: Deploy and Promote
Foundry Toolbox Lifecycle: Deploy and Promote For developers looking to manage Microsoft Foundry tools across agents, this article presents one recommended pattern: define each Toolbox in its own azure.yaml , deploy it separately from project infrastructure and agents, and pass environment-specific Bicep outputs through GitHub Actions. Why Manage a Foundry Toolbox Separately? Organizations are integrating agent development into established software development lifecycles, raising questions about how teams govern and reuse tools. In this post, a “tool” means an external capability an agent invokes such as web search, a tool exposed by a Model Context Protocol (MCP) server, or a third-party application. Tools let agents retrieve live data or take actions in external systems. How can teams avoid rebuilding the same integrations? Microsoft Foundry Toolbox offers a shared way to manage tools. This post explores how to structure Toolbox ownership and deployment so a reusable collection doesn’t become a Toolshed. What Is a Microsoft Foundry Toolbox? A Toolbox in Foundry is a versioned collection of tools exposed through a single MCP-compatible endpoint. It is created in the context of a Foundry Project, and agents connect to that endpoint to use its tools. Microsoft’s Toolbox overview describes a way to define shared tools once and expose them through a single MCP-compatible endpoint. It centralizes tool access, credentials, governance, and versioning so teams can reuse approved tools across agents without rebuilding each integration. Instead of embedding a separate Web IQ integration in every Finance agent, teams can configure Web IQ once in a shared Toolbox. Each agent then connects to the Toolbox’s MCP endpoint and invokes the tools it exposes. The Toolbox and its project connections provide the shared configuration and credentials. Should a Toolbox Be Deployed with an Agent? Foundry examples show toolboxes created through SDKs and consumed by agents. The key design decision is which deployment lifecycle owns toolbox version changes. When multiple agents share a toolbox, manage its versions separately from any one agent’s deployment. A Foundry Project can contain zero or more agents. Agent deployments should be idempotent and managed independently. An agent’s availability should not depend on another agent. A Toolbox has its own lifecycle and versioning. A Toolbox lives outside any single agent, within a Foundry Project. Creating a toolbox with the Python SDK does not, by itself, make the toolbox part of an agent; the SDK call creates a version in the Foundry Project. The coupling arises when the agent’s deployment pipeline also owns and publishes that toolbox. To keep the lifecycles independent, manage toolbox versions through a project-level pipeline and have agents consume the toolbox endpoint. This avoids redeploying an unrelated agent for toolbox changes and avoids making shared tool availability depend on one agent’s lifecycle. Provision the Project, Then Deploy the Toolbox A Foundry project is provisioned as an Azure resource (`Microsoft.CognitiveServices/accounts/projects`), while toolbox versions are created through the Foundry project API. In this deployment pattern, we need to provision the project and any required connections first, then create and deploy the toolbox using the project endpoint. See the toolbox version API reference for details. The Foundry project and its project-level role-based access control (RBAC) and connections are infrastructure prerequisites that can be managed with infrastructure as code (IaC). The toolbox version is then created in a separate deployment step using the project endpoint, with environment-specific values supplied as Bicep outputs. This keeps the Toolbox alongside the project’s lifecycle without coupling it to any one agent. Where to Store the Toolbox Configuration Like the Foundry Project, a Toolbox is shared across agents and should follow the project’s lifecycle rather than an individual agent’s lifecycle. Store its definition alongside the project’s IaC and include its deployment in the project-level infrastructure workflow. Create a separate folder and `azure.yaml` for each Toolbox. This gives each Toolbox its own deployment step and `azd` environment, so teams can deploy, update, and version Toolboxes independently without coupling their release cycles. This post uses that structure to make each Toolbox’s lifecycle explicit. Foundry Toolbox Versioning and Promotion Foundry stores each Toolbox version as an immutable snapshot of its configuration. Changes create a new version rather than modifying an existing one. The first version becomes the default automatically; subsequent versions must be promoted explicitly. See Foundry Toolbox version managementfor details. Agents using the Toolbox’s stable consumer endpoint receive the default version. Developers can use a version specific endpoint to validate changes before promotion. Promoting a version changes what the consumer endpoint serves without requiring a rebuild and deploy of the agents code. To roll back, promote a previously retained version. Foundry provides these versioning and promotion capabilities, but the team still decides how changes are tested, approved, retained, and retired. A version captures Toolbox configuration not a frozen copy of the external services it calls—so rolling back the Toolbox does not necessarily reverse downstream service changes. i.e. changes that were made to tools of a custom downstream MCP server. Teams can remove older or unwanted versions after confirming they aren’t needed for rollback or used through version specific endpoints. If multiple versions exist, promote another version before deleting the current default. When using `azd`, deleting the only remaining version also removes the Toolbox. One important connection to our example: its `postdeploy` hook promotes immediately. We should distinguish that sample behavior from a production process that validates a candidate version before promotion. Deploy a Foundry Toolbox with GitHub Actions In this example, the Toolbox is deployed as a separate step in the same GitHub Actions workflow, after the Bicep deployment provisions the Foundry Project. This lets the workflow populate the Toolbox’s `azd` environment with the infrastructure outputs before deployment. You can also split the deployments across jobs or workflows, provided the Toolbox step receives the required outputs and runs after its prerequisites are ready. Prerequisites Foundry Project and region: Create the Foundry Project and any project connections required by the Toolbox before deployment. Confirm that the target region supports the Toolbox’s tool types and models using the tool support by region and model table Identity and access: Configure GitHub Actions to authenticate to Azure using OpenID Connect (OIDC), as in the linked sample. The identity that creates or updates Toolbox versions needs the Foundry User role on the project (Toolbox prerequisites). If the same workflow deploys Bicep, that identity also needs permission to deploy the template’s resources and create its role assignments at the applicable scopes. Tooling: Install Azure Developer CLI 1.37.0+, as required by the unified `microsoft.foundry` extension. Install the extension with `azd ext install microsoft.foundry`, following the Foundry extension installation guidance. The linked sample pins `azd` 1.37.1 and installs `azure.ai.toolboxes` separately. Configuration Provide the project endpoint, environment name, location, and every downstream endpoint or connection name referenced by the Toolbox’s `azure.yaml`. Create the required Foundry project connections before deploying the Toolbox. Configure credentials on those connections or in an approved secret store, not in Bicep outputs; see Toolbox authentication. - name: Deploy and promote the toolbox working-directory: foundation/toolboxes/fibey-toolbox env: AZURE_ENV_NAME: ${{ steps.infrastructure.outputs.AZURE_ENV_NAME }} FOUNDRY_PROJECT_ENDPOINT: ${{ steps.infrastructure.outputs.FOUNDRY_PROJECT_ENDPOINT }} AZURE_AI_PROJECT_ENDPOINT: ${{ steps.infrastructure.outputs.AZURE_AI_PROJECT_ENDPOINT }} run: | azd deploy fibey-toolbox --no-prompt The infrastructure deployment should expose the values the Toolbox needs as outputs—in this case, Bicep outputs. The linked sample uses `AZURE_ENV_NAME`, `AZURE_LOCATION`, `FOUNDRY_PROJECT_ENDPOINT`, and `AZURE_AI_PROJECT_ENDPOINT` for the deployment context. Its Toolbox configuration also consumes `INVENTORY_MCP_URL`, `WORK_ORDERS_API_URL`, `KB_MCP_URL`, and `KB_CONNECTION_NAME`. Expose the corresponding values for each target environment and region. The Toolbox’s `azure.yaml` references the imported values, so the same definition can be reused across environments and regions. For each target, provide that target’s infrastructure outputs instead of manually changing endpoint values, and confirm that the required services and tools are supported in the target region. The example references `steps.infrastructure.outputs` because the infrastructure and Toolbox deployment steps run in the same GitHub Actions job. If they run in separate jobs, expose the required values as job outputs and consume them through `needs`. This keeps the deployments connected without tying their release cycles together: infrastructure provides the deployment context, and the Toolbox consumes it. Keep credentials in managed identities or approved secret stores rather than ordinary deployment outputs. The complete workflow demonstrates authentication, infrastructure outputs, and environment initialization. Its extension-install step currently uses `azure.ai.toolboxes`; replace that step with `azd ext install microsoft.foundry` when following the current Learn guidance above. Version promotion is handled by the `postdeploy` hook in the Toolbox’s `azure.yaml`. Verify Toolbox Deployment and Promotion The sample’s `postdeploy` hook promotes the deployed version to the default and checks that promotion succeeded. Redeploying an unchanged Toolbox definition does not create a new version. To inspect the versions and confirm which one is default, run: azd ai toolbox versions list fibey-toolbox The default version is marked with `*`. This confirms which version is default, but not that its tools work. For runtime verification, follow the Toolbox verification guidance to initialize MCP and list tools using the version-specific endpoint. Test a tool call only with a safe, read-only operation. The developer needs the Foundry User role on the project; prompt-agent and OAuth scenarios can require additional permissions for the agent identity or end user. Troubleshooting If deployment or promotion fails, check that the deployment identity has the required project role, that the project endpoint and Toolbox configuration values were supplied, and that the required project connections and tools are available in the target region. Conclusion Toolbox provides a shared way to manage tools across agents without tying their lifecycle to any one agent. Keeping toolbox definitions alongside your Foundry Project infrastructure, while deploying them as a separate step, lets teams update and version tools independently while retaining a clear dependency on the project. As your organization adopts this pattern, consider who owns each toolbox, how changes are tested and promoted, and who can access its tools. That governance will help keep a useful Toolbox from becoming a Toolshed.Real-Time Multichannel Speech-to-Text is now generally available
In August, we introduced Real-Time Multichannel Speech-to-Text in public preview. It gave contact centers and conversational AI builders a simpler way to transcribe stereo audio without giving up channel separation. Today, Real-Time Multichannel Speech-to-Text is generally available in Azure Speech, part of Microsoft Foundry. You can now run stereo transcription in production with the same simple Speech SDK integration. This release also adds the capability preview customers asked for most: language identification alongside multichannel. Since the public preview launched in August, customers have run more than 3 million real-time multichannel sessions, led by contact center workloads in production. A quick recap: why channel separation matters In many contact center and communication scenarios, each participant is already recorded on a separate channel. For example, the customer is on one channel and the agent on the other. That separation carries valuable context, especially when people interrupt each other or speak at the same time. Until now, teams had to choose between two imperfect options. They could split channels and run parallel transcription pipelines, which adds operational overhead. Or they could merge channels into one stream, which can hurt transcription quality and speaker separation. Real-Time Multichannel Speech-to-Text removes that tradeoff. Azure Speech transcribes up to two channels independently in a single real-time session, and every recognition result is tagged with its source channel. If the player doesn't load, open the video in a new window: Open video What’s new at general availability Production-ready: Real-time multichannel transcription is now generally available and supported for production workloads. Same price as single channel: Multichannel transcription is priced the same as single-channel real-time transcription, so keeping channels separate doesn't cost more. Language identification with multichannel: Each channel can be recognized in its own language. For example, an English-speaking agent and a Spanish-speaking customer can be transcribed in the same session, and each result carries both its channel and its detected language. Works with the features you already use: Diarization, custom speech, semantic segmentation, and TrueText all work with multichannel. Same Speech SDK, recognition events, endpoint, and authentication. One configuration setting turns it on. Get started If you already use Azure Speech, getting started is simple. Enable multichannel processing, and optionally add an automatic language detection configuration: import azure.cognitiveservices.speech as speechsdk import time ENABLE_LID = False done = False speech_config = speechsdk.SpeechConfig(subscription="YourSpeechKey", endpoint="YourSpeechEndpoint") # Enable Multichannel processing speech_config.set_property(speechsdk.PropertyId.Speech_EnableMultiChannelProcessing, "true") # Optional: identify the language on each channel auto_detect_config = None if ENABLE_LID: speech_config.set_property(speechsdk.PropertyId.SpeechServiceConnection_LanguageIdMode, "Continuous") auto_detect_config = speechsdk.languageconfig.AutoDetectSourceLanguageConfig(languages=["en-US", "es-MX"]) else: speech_config.speech_recognition_language = "en-US" audio_config = speechsdk.AudioConfig(filename="stereo.wav") speech_recognizer = speechsdk.SpeechRecognizer( speech_config=speech_config, auto_detect_source_language_config=auto_detect_config, audio_config=audio_config, ) # Print Multichannel results def recognized_cb(evt: speechsdk.SpeechRecognitionEventArgs) -> None: if evt.result.reason == speechsdk.ResultReason.RecognizedSpeech: label = f"channel {evt.result.channel}" if ENABLE_LID: label += f" | {speechsdk.AutoDetectSourceLanguageResult(evt.result).language}" print(f"RECOGNIZED ({label}): {evt.result.text}") def stop_cb(evt: speechsdk.SessionEventArgs) -> None: global done done = True speech_recognizer.recognized.connect(recognized_cb) speech_recognizer.session_stopped.connect(stop_cb) speech_recognizer.canceled.connect(stop_cb) speech_recognizer.start_continuous_recognition() try: while not done: time.sleep(0.5) finally: speech_recognizer.stop_continuous_recognition() To also identify individual speakers within a channel, use ConversationTranscriber instead of SpeechRecognizer. Each result then includes both the channel and the speaker ID. Built for real-world conversations Contact centers and CCaaS platforms: Keep agent and customer audio separate for agent assist, quality monitoring, compliance, and post-call analytics, without running two pipelines. Multilingual customer service: Language identification lets each side of the call be transcribed in its own language, ready for translation, summarization, or routing. Conversational AI: Channel-aware transcripts give voice agents and copilots a cleaner record of who said what for downstream reasoning and summarization. Good to know Supports up to two channels, with continuous recognition. Heavily overlapping speech on both channels can increase result latency. Phrase lists, multilingual models, post-stream refinement, and pronunciation assessment aren't supported with multichannel in this release. Requires Speech SDK 1.51 or later. For Go, and for channel metadata on diarization results in JavaScript, use version 1.52 or later. Get started today Real-Time Multichannel Speech-to-Text is now generally available in Azure Speech. If you’ve been choosing between parallel pipelines and mixed-audio compromises, you can now keep stereo channel separation in production, with built-in language identification. Read the documentation: How to transcribe multichannel audio in real time Watch the demo: https://aka.ms/stt-multichannel-demo Azure Support: File a support request through the Azure portal GitHub: Open issues on the Azure Speech SDK samples repositoryFrom Python Agents to Copilot Harness : Putting Microsoft Foundry to the Test
You have built the agents. Written the Python. Connected the data. Worked out how the pieces talk to each other. Then the conversation shifts to harnesses. The prospect of convergence around the GitHub Copilot harness across GitHub, Microsoft Foundry and Copilot Studio (CPS) raises a very practical question: What happens to the pro-code agents I already built? Do I rewrite them, wrap them, or keep them? Rather than debate it in the abstract, I wanted to give it a shot. I already had a Microsoft Agent Framework (MAF) demo with Python agents, Fabric sales data and product knowledge. Could I keep the useful business workflows, remove the custom agent wrappers, and let a managed harness do more of the work? That experiment became the demo behind this blog. Not another empty chat box, but an app to ask business questions, inspect actual tool activity, follow the evidence and create a brief you can revise and download. This is a practical Foundry experiment and the question I wanted to answer was: how much of this particular agent application can move into the harness, and what still belongs in my code? TL;DR: I moved a Python/MAF research demo to a Foundry-managed Copilot harness to test whether it could handle the same business questions. Native research and source connections reduced the agent-side orchestration I had to write, while the app still owns authentication, streaming and secure access. Downloadable briefs are an extra experiment, not part of the original migration. Focused tests were promising, but do not establish complete feature parity or production readiness. The Starting Point: Pro-Code Agents The starting point is olivierb123/microsoftiq-lead-agent-demo. It used four hosted Agent Framework wrappers and application-controlled fan-out. Python agent code and custom source adapters handled the integrations; the application determined which agents to call and assembled their results. That approach makes the orchestration explicit. It also puts the responsibility for hosting the wrappers, maintaining source adapters and coordinating the workflow in the application. For this experiment with harness, I kept the business scenario but changed the execution model. Instead of recreating those wrappers inside another service, I configured one Foundry-managed Microsoft Copilot harness agent with instructions, native capabilities and connected sources. Responsibility Pro-Code Demo Harness Experiment Workflow orchestration Application-controlled agent calls Managed agent selects tools and can delegate Research Hosted wrappers and custom adapters Native web search and page fetching Business data Application source integration Native Fabric connection Product knowledge Application retrieval integration Foundry IQ knowledge-base retrieval through native MCP Working output Application-managed result assembly Conversation workspace and published artifacts Application code UI plus agent orchestration UI, authentication, streaming and session/download authorization This repository contains the migrated implementation. The original pro-code demo remains separate and was not overwritten. A Practical Question, Not a Tool Demonstration The scenario is a fictional sales team working with FieldForge product documentation. A useful assistant should help answer questions such as: How many opportunities are open in the expanded synthetic demo, what is their total and probability-weighted value, and how do our internal forecasting definitions explain those numbers? That request needs two different kinds of evidence: structured opportunity data and the actual internal document defining the forecast. It should not require the user to name a connector or prescribe a tool sequence. A more advanced request asks for a South territory brief combining sales performance, priority opportunities, product capabilities and official construction heat-exposure guidance. The user can then request a revision or a downloadable Markdown artifact in the same conversation. These examples exercise the harness as a working environment, not just a text-generation endpoint. However, they are requests to explore, not promises that every tool or subagent will run on every turn. Why a Local Web App? I deliberately kept the test experience in a local web app. I wanted to make it easy to ask a question, try a follow-up and inspect what happened, without turning the experiment into a web-hosting project first. The React workbench and Node.js backend run locally; the agent and connected sources run in the cloud. After signing in, I can choose a sample question, watch the streamed response, inspect Activity and Evidence, and request a revision or download in the same conversation. I do not need to reconstruct a raw SDK response to see whether a source was actually called. That separation also makes the migration easier to understand. The web app is the test surface, not the agent runtime. There is no local Python agent server hiding behind it: the backend sends the request to Foundry and handles the application's authentication, streaming and session-owned downloads. For this first experiment, the backend is intentionally loopback-only. Hosting the application publicly is a separate engineering task, not a prerequisite for testing the harness against a useful scenario. The Architecture The configured agent uses microsoft_copilot_preview and gpt-5-mini. The agent definition lives in harness/azure.yaml, rather than a Python agent server. The application, backend and data scripts use JavaScript/Node.js. There is no Python application runtime, pip setup or virtual environment required for this version. That is not a zero-code migration: the application still owns sign-in, token validation, streaming, conversation ownership and secure downloads. The backend does not execute the native source calls a second time. Foundry executes them; the application observes their returned results and presents them in Activity and Evidence. What It Looks Like in the Foundry Portal The local workbench is only one view of the experiment. Foundry also supports hosted pro-code agents: I can package custom agent code, including a Python/MAF implementation, and its dependencies in a container and let Foundry manage the hosting. I still own the agent implementation and its orchestration; using Python does not mean I must run the server myself. This experiment instead uses a managed-harness prompt agent. I configure its instructions, capabilities and source connections, while Foundry supplies the harness execution environment and native tool orchestration. Both approaches can run in Foundry. The distinction is not simply local versus cloud, or Python versus no Python: it is how much agent runtime and orchestration I implement versus delegate to the managed harness. The application's UI, authentication and session/download authorization remain my responsibility in this demo. My microsoftiq-copilot agent and its configured tools/connections make the change tangible. The configuration ties together the native harness capabilities, Fabric access and product-knowledge retrieval shown in the architecture diagram. No Web IQ Wrapper in This Version The Web IQ integration from the earlier demo is not carried forward. External research uses the harness's native web search to discover sources and its Web capability to read relevant pages. This supports the research portion of the scenario without maintaining a separate Web IQ agent wrapper. It is not a claim that native web research reproduces every Web IQ behavior or data contract. Fabric and product knowledge are optional grounding sources, not stages that every question must pass through. A public-research question can stay a public-research question. Private business data must not be sent to public web tools. More Direct Integration with Fabric and Foundry IQ For me, the integration improvement is the ownership boundary: the harness uses configured native connections instead of calling application adapters that obtain credentials and query sources themselves. Fabric supplies structured business facts. The native Fabric connection uses the signed-in user's context to access a dedicated data agent over imported semantic models. There is no app-only Fabric credential fallback. The models contain demonstration data, not live CRM records. Foundry IQ supplies document evidence. The product-knowledge MCP connection reaches a knowledge base backed by Azure AI Search. Query planning and semantic retrieval return extractive evidence, including stored document metadata, for the harness to use in its answer. This connection uses the Foundry project's managed identity; it does not establish per-user document ACL enforcement. The distinction matters. A supportingDocId in an opportunity row is a relationship reference, not proof that the corresponding document has been retrieved. Fabric cannot substitute for document content, titles or update dates from the knowledge base. Calling this integration "better" means more direct native integration with clearer source responsibilities. I have not established a quality, latency or cost improvement over the MAF implementation, nor certified genuinely different-user authorization. What the Experiment Actually Showed Focused tests showed that the harness could retrieve sales figures, find internal documents, research the web and continue a conversation. That supported the core research workflows we wanted to carry over from the MAF demo. The most revealing test asked for sales figures together with the internal document explaining how the forecast should be interpreted. Some early runs got the numbers right but did not retrieve the requested document. The answer sounded convincing, but part of its explanation lacked verified support. After clarifying the agent's instructions and which source should answer each part of the question, one test run successfully retrieved evidence from both sources. This used synthetic demo data, not live customer information. The lesson: connecting the tools is only the start. You still need to test whether the agent uses the right sources and whether those sources actually support its answer. Beyond the Migration: Trying Workspace Files and Briefs Once the core question-answering workflows were working in focused tests, I wanted to try something we had not implemented in the MAF demo: turning an answer into a working document. Why save a brief? Not every answer needs one. But a territory review is a useful example: instead of leaving the analysis in a chat response, I can request a Markdown document to keep, review or hand off, then ask for a revision in the same conversation. The file is an optional deliverable, not a prerequisite for retrieving sales data or product evidence. This is where the harness's conversation workspace and native file capabilities become interesting. I can explore creating, reading back and revising an artifact in the managed environment without rebuilding those agent-side tools in a Python wrapper. MAF could support the same kind of workflow with appropriate tools and code; this is an additional capability in this demo, not something exclusive to a harness. Publication adds a separate step when the user actually wants a download. A workspace file is not automatically downloadable: the workbench registers it only after a successful native upload returns a real file ID, and only the owning unexpired session can download it. The application still implements those access checks. The migration question is therefore "can I keep answering the useful business questions?" The extension question is "what else can I build on the harness's native capabilities?" Briefs help explore the second question. Actual tool results, not assistant narration, establish whether creation, revision or publication occurred. There are still operational boundaries. The app is loopback-only, the harness is a public preview, inference and retrieval incur costs, and workspace state is not durable application storage. Refreshing the browser or restarting the backend loses local session mappings. Production hosting, retention and broader authorization need separate work. Shell and external business-system writes remain disabled. The Takeaway So, what happened to my Python agents? For this scenario, their hosted wrappers were no longer needed. The business questions stayed; their execution moved into a managed harness, and the remaining application code focused on the experience and its security boundaries. For this practical research scenario, that shifts the work from maintaining Python wrappers and fixed fan-out toward configuring the agent, defining source responsibilities, building the user experience and verifying evidence. Fabric and Foundry IQ fit into that environment directly, while native web research replaces the earlier Web IQ path for the tasks explored here. When I Would Still Use MAF Deterministic Routing and Local Hybrid Execution: MAF allows you to deploy hybrid topologies where small, local models (like MAI-Decision / Jev) handle rapid, deterministic triage and tool-gating, reserving expensive cloud-hosted frontier models for complex reasoning. A managed harness forces all routing into its proprietary cloud runtime, stripping away your ability to optimize latency and compute token economics. Absolute Control over the Orchestration Loop: The Copilot Harness uses an abstracted reasoning engine to decide when to activate a skill or invoke a tool. Native Toolchain Continuity and Hosting: MAF agents operate as standard C# or Python applications. Granular State and Semantic Memory: Managed harnesses provide a generalized shared memory layer. MAF allows you to build custom memory providers (like custom Azure SQL or Cosmos DB schemas) Unrestricted Interoperability Mechanics: While the Copilot Harness can consume Agent-to-Agent (A2A) protocols and Model Context Protocol (MCP) servers, building the actual server logic in MAF gives you the power to manipulate the raw protocol mechanics. If you need to manage custom message headers, inject highly specific tokens for platforms like SAP or ServiceNow, or alter payload structures mid-flight, MAF provides the unabstracted access required to do so. For this demo, the harness was a useful way to move beyond fixed fan-out and put research, connected evidence and artifacts into one managed environment. For another application, keeping its MAF agents may be the better decision. My takeaway is simple: start with a real task, move the responsibilities that fit the harness, and test the boundary instead of assuming the migration works. What's Next This experiment answered one question—now I'm curious about others: How does the harness perform under sustained load? What happens when Fabric semantic models grow to production scale? Can the same approach work for agents that need to write back to business systems? If you're exploring similar migrations, I'd be interested to hear what worked and what didn't. Try the Project The code is available at olivierb123/microsoftiq-copilot-harness-demo. Choose your path: Run the demo locally → Start with the README and setup checklist Explore the agent configuration → See harness/azure.yaml for the Foundry agent definition Understand the data model → Review the synthetic data documentation Compare with the original MAF approach → Check out the original pro-code demo Questions or feedback? Open an issue on the repo or share your own migration experience in the comments below.When the Answer Isn’t in the Document: Metadata-Aware Agentic RAG with Foundry IQ
The problem SharePoint libraries often contain years of carefully curated metadata, including root cause, severity, business unit, document type, owner and classification. If that metadata never reaches the retrieval pipeline, however, a RAG system cannot use it. This creates a common blind spot: the information that explains what a document is about may exist in its metadata rather than its text. Consider an incident review containing this statement: “Investigation found that a DNS record was repointed during a migration while the old target was still serving writes.” The associated Root Cause Category is Configuration change, but those words do not appear in the document. Another review might mention that a configuration change was suspected and ruled out. Text-only retrieval can therefore favour the wrong document. In the sample dataset used for this project, none of the 19 reviews classified as configuration-change incidents contained the word “configuration”, while six reviews with other root causes did. Metadata does not improve every search. It helps when the information that determines what a document is lives outside the document text. Why tuning alone cannot fix it With a native SharePoint knowledge source, document text is extracted, chunked and embedded, while standard properties are retained. Custom SharePoint columns are not part of that ingestion path. Fields such as Root Cause Category, Contributing Factors, Detection Method and Severity therefore never become structured fields available to retrieval. If the metadata is absent from the index, search tuning cannot make it count. Flattening all metadata into a single text string is also problematic: Notification Service | Sev2 | Configuration change | Missing runbook This preserves the words but loses their meaning. A root cause, severity and contributing factor represent different concepts and should remain separate fields. Bring a custom Azure AI Search index The approach is to create and control a custom Azure AI Search index, then expose it to Foundry IQ as a searchIndex knowledge source. This combines metadata control with agentic query planning and a governed retrieval surface. Approach Metadata control Agentic planning Native SharePoint knowledge source No Yes Custom index queried directly Yes No Custom index as a knowledge source Yes Yes Architecture The key design principle is simple: every chunk carries its parent document's metadata. Figure 1. Metadata-aware retrieval architecture with Azure AI Search and Foundry IQ. The ingestion pipeline extracts a document, creates chunks, attaches document-level metadata to every chunk, generates embeddings and writes the records to Azure AI Search. Foundry IQ then uses the index as a knowledge source. Azure AI Search holds the metadata. Foundry IQ decides when to use it. Figure 2. Detailed implementation view, including the baseline and metadata-aware retrieval paths. At query time, the search service calls the configured models for vectorisation and query planning. Where key authentication is disabled, the search service's managed identity needs the required access. In the tested implementation, the Cognitive Services User role resolved HTTP 401 responses from retrieve requests. Put metadata on every chunk A chunk can only be retrieved and ranked using information available on that chunk. Each metadata property should therefore remain in its own field: { "id": "doc1035-000", "parentId": "doc1035", "title": "Notification Service: failed sign-ins", "content": "<extracted review text>", "rootCauseCategory": "Configuration change", "contributingFactors": "Missing runbook; Change outside window", "detectionMethod": "Customer report", "severity": "Sev2" } A separate metadata index does not solve the same problem because a match against metadata in one index cannot raise the ranking of a content chunk in another. What influences retrieval Four areas matter in this design: Search fields: searchFields determine which fields generated subqueries search. Semantic configuration: prioritised fields give the semantic reranker access to important metadata. Query hints: hints help the planner connect natural-language requests to known metadata values. Filters: a baseFilter or request-level filterAddOn can enforce constraints. Boost hints influence ranking without excluding documents. Filter hints can narrow the result set when the planner determines that a filter is appropriate. "queryHints": { "boosts": [{ "kind": "fieldValue", "field": "rootCauseCategory", "fieldValues": ["Configuration change", "Capacity", "Software defect", "Dependency failure", "Certificate expiry"], "boost": 3.0, "boostInstructions": "Boost when the user describes what caused an incident." }] } Hints are best effort. Hard requirements should use a base filter or document-level access control rather than relying on the planner to select a hint. The tested configuration used the 2026-08-01-preview API. Current documentation should be checked for supported models, limits and behaviour before implementation. Why can't vector search or semantic ranking solve this? This is probably the most obvious question: if embeddings understand meaning, and semantic ranking understands context, why do we need metadata at all? The answer is that vector search and semantic ranking solve a different problem. This approach complements them rather than replacing them. Vector search finds similarity, not recorded facts In a typical RAG pipeline, document chunks are converted into embeddings, numerical representations of their meaning. The user's question is embedded as well, and vector search finds chunks that are close to it in vector space. For example, a passage saying: “The gateway routing rule was updated shortly before the incident.” might rank highly for: “Find incidents caused by configuration changes.” That's useful. But it doesn't necessarily mean Configuration change was the confirmed root cause. The passage could describe an investigation path, a contributing factor, or even something that was later ruled out. Vector similarity is essentially asking: “Does this content mean something similar to what the user is asking about?” Metadata lets us ask a different question: “What was this incident actually classified as?” If the incident review already contains a curated rootCauseCategory = Configuration change field, we should not require an embedding model to rediscover that fact from the prose every time somebody searches. What about semantic ranking? Semantic ranking helps, but at a different stage. In Azure AI Search, semantic ranker applies secondary ranking to an initial result set, using language understanding to promote results that are more semantically relevant to the query. That can help distinguish between: a configuration change that caused an incident a configuration change that was merely investigated a configuration change that was explicitly ruled out But semantic ranking still works with the information supplied to the retrieval pipeline. It cannot make use of a classification stored in a separate metadata field if that field was never supplied to retrieval or ranking in the first place. The difference becomes clearer with a real query Consider: “Show me configuration change incidents that customers reported.” A content-first approach primarily asks: “Does this passage sound relevant to configuration changes and customer reports?” A metadata-aware approach can additionally ask: “Is the recorded root cause Configuration change , and is the recorded detection method Customer report ?” Those signals can influence retrieval in different ways: Boost: favour incidents with those metadata values while still allowing other relevant results. Filter: restrict the candidate set when those classifications represent hard constraints. Retrieval layer Typical content-first RAG Metadata-aware approach Vector search Finds chunks with similar meaning using content embeddings Keeps content embeddings for narrative similarity Searchable fields Primarily searches document content and other configured fields Makes classifications such as root cause and detection method explicit searchable or filterable fields Semantic ranking Reranks the supplied candidate content for relevance Can also benefit from curated text fields when those fields are included and prioritised in the semantic configuration Query planning Translates the question into retrieval over content, optionally with application-defined filters Uses the metadata taxonomy to generate field-specific boosts or filters where appropriate There is an important nuance here: traditional RAG can absolutely use metadata filters and hybrid search. So the contribution here isn't a new embedding algorithm, nor is metadata an alternative to vector search. It is about making structured knowledge a first-class retrieval signal, and wiring that information into candidate retrieval, ranking and Foundry IQ's agentic query planning rather than asking the system to infer every classification from document text. And importantly, in the comparison below, both approaches use the same Azure AI Search index. So the comparison isn't: vector search vs. metadata. It's: content-first retrieval vs. retrieval that can also use the structured information the organisation already knows. Measuring the impact Two knowledge bases were created over the same Azure AI Search index. The baseline searched title and content. The metadata-aware configuration used the same content plus structured metadata, semantic configuration and query hints. Ten questions were run through both configurations. Correctness was determined directly from the metadata attached to returned reviews, rather than by asking an LLM whether a result appeared relevant. For the question “What can be learned from outages caused by configuration changes?”, the planner generated: rootCauseCategory eq 'Configuration change' Matching reports in top 5 Score Baseline 0 Metadata-aware 3 Best possible 5 Across ten questions and four runs using gpt-5.4-mini for query planning, the baseline returned 26 matching reviews in the top five. The metadata-aware configuration returned 39 to 41, against a best possible score of 50. The gains appeared where metadata carried the missing meaning: Configuration changes: 0 → 3 Configuration changes reported by customers: 0 → 3 Capacity in production: 1 → 5 Alert fatigue: 3 → 5 Queries whose important terms already appeared in the document text scored 5/5 in both configurations. The result is therefore more specific than “metadata improves search”: metadata closes a retrieval gap when document text does not fully describe what the document represents. A failure mode worth handling Because query planning uses an LLM, the planner can occasionally generate a filter that the search index rejects. Two invalid examples observed during testing were: severity eq Sev1 changeRelated eq true The first omitted quotes around a string. The second treated an Edm.String field containing Yes and No as a Boolean. The latter caused the retrieve request to fail with HTTP 502. The fix was to make the schema and allowed values explicit: This is a text field, not a Boolean. The only valid values are 'Yes' and 'No'. Never compare the field with true or false. Application code should also handle retrieval failures rather than assuming every generated filter will be valid. Production considerations A custom index provides control, but the solution now owns ingestion. Options include the SharePoint indexer with custom columns, an Azure Function using Microsoft Graph, or an existing pipeline built with Logic Apps, Azure Data Factory or Microsoft Fabric. A custom Azure AI Search index does not automatically inherit the SharePoint permissions model. Where users have different document permissions, ACLs must be carried into ingestion and retrieval. Query hints should also be regenerated when taxonomy values change. Key takeaways Confirm that the required metadata reaches the index. Keep metadata structured rather than flattening it into one text field. Attach parent-document metadata to every chunk. Use search fields, semantic configuration, query hints and filters deliberately. Describe field types and valid values clearly in filter instructions. Evaluate against a baseline using objective correctness rules. Metadata-aware retrieval is not about making every search better. It gives the retrieval system access to context that does not exist in the document text. Try the proof of concept The complete proof of concept, synthetic dataset, index scripts, knowledge-base configurations and A/B evaluation harness are available in the GitHub - shikha-msft/foundryiq-metadata-agentic-rag. References Create a search index knowledge source Create a knowledge base Query a knowledge base via API or MCP What is Foundry IQ?
Building a Self-Updating RAG System: Handling Document Uploads, Updates and Deletions
The Hidden Challenge of Production RAG Imagine your organization has deployed an AI assistant to answer questions about employee policies. An employee asks, “How many days of annual leave am I entitled to?” The assistant responds confidently: “15 days.” There is just one problem. The company updated its policy last week. Employees are now entitled to 20 days. The updated PDF was uploaded successfully. The storage service is healthy. The search index is responding. The language model is generating answers without errors. Yet the answer is wrong. This is a different kind of production failure. Nothing appears to be broken at the infrastructure level. The failure lies in the relationship between the source document and the information the AI retrieves. Retrieval-Augmented Generation (RAG) systems depend on external knowledge to ground their responses. But that knowledge is not static. Policies change, contracts get revised, product documentation evolves, and outdated documents are removed. When the underlying documents change, the associated chunks, embeddings, metadata, and search-index entries must be managed accordingly. Otherwise, the system can continue generating plausible answers from information that is no longer valid. Building a RAG pipeline is a retrieval problem. Keeping it correct as data changes is a data lifecycle engineering problem. In this article, we will design a self-updating RAG system that handles document creation, updates, and deletion while addressing asynchronous processing, version consistency, failed jobs, and stale retrieval results. The goal is not simply to index documents automatically. It is to make sure that the right version of the right document is available to the right user when a query is executed. Understand the Problem Before Designing the Architecture A basic RAG pipeline is relatively straightforward: Load a document. Extract its text. Split the text into smaller chunks. Generate an embedding for each chunk. Store the chunks and embeddings in a searchable index. Retrieve relevant chunks when a user asks a question. Pass the retrieved context to a language model to generate an answer. This works well when the document collection is relatively static. The difficulty begins when the source data changes after indexing. Consider three common scenarios. Scenario A: A document is uploaded A new policy is added to the knowledge base. The system must process it and make its content searchable. Until indexing finishes, the document may not be available to the chatbot. Scenario B: A document is updated The original policy allows 15 days of annual leave. A revised policy allows 20 days. If the new version is indexed without correctly deactivating the old version, both versions may appear in search results. The language model may then select the wrong passage or combine conflicting information. Scenario C: A document is deleted An administrator removes a document from the application. However, deleting the original PDF from storage does not automatically delete the corresponding records from Azure AI Search. The content may remain searchable until its indexed chunks are removed. Azure AI Search document deletion itself can also take time to be reflected in index statistics. Microsoft Learn: Delete documents in Azure AI Search These scenarios reveal an important design principle: The source document, its metadata, the background processing jobs, and the search index must be treated as parts of one logical lifecycle—even though they are separate systems. We need a design that can handle failures between these systems without exposing outdated or unauthorized content. Design the System Around Clear Responsibilities Rather than making the upload API responsible for every operation, we can separate the system into a document management path, an asynchronous processing path, and a query path. The Proposed Architecture The design uses the following components: Component Responsibility Azure Blob Storage Stores the original document files Azure Cosmos DB Maintains document metadata, versions, and lifecycle state Azure Service Bus Queues ingestion and deletion jobs Background worker Extracts text, creates chunks, generates embeddings, and updates the index Microsoft Foundry Provides the models used for embedding generation and response generation Azure AI Search Stores searchable document chunks, metadata, and vectors FastAPI Exposes document management and chat APIs Microsoft Agent Framework Supports agentic query workflows when multi-step reasoning or tool use is required The background worker can be implemented as a separate Python service or another suitable compute component. It does not have to be part of the FastAPI process. Why separate these responsibilities? Suppose a user uploads a 100-page contract. The application may need to extract text, split thousands of characters into chunks, generate embeddings, and send multiple indexing requests. Performing all of that synchronously inside the upload request increases latency and makes the API vulnerable to timeouts. Instead, FastAPI accepts the request, persists the document and its metadata, and arranges for the work to be processed asynchronously. The worker performs the expensive operations independently. This allows ingestion to scale separately from query traffic and makes retries easier to manage. The query path remains separate: it retrieves eligible, relevant chunks and uses them to ground the model's response. Establish a source of truth Azure Cosmos DB should hold the authoritative lifecycle metadata in this design. Azure AI Search is the retrieval index, not the authority on whether a document is currently active. For example, a document record might look like this: { "id": "policy-123", "documentId": "policy-123", "currentVersion": 2, "indexedVersion": 1, "status": "PROCESSING", "blobPath": "policies/leave-policy.pdf" } Here, version 2 is the desired version, but version 1 is still the last successfully indexed version. The application must not assume that the latest upload has already become searchable simply because the metadata record has been updated. This distinction between the desired version and the indexed version is central to reliable lifecycle management. Implementing Document Uploads A reliable upload operation involves more than storing a file and sending a message to a queue. It must establish a durable record of the document, identify the version being processed, and ensure that background processing can be retried safely. Step 1: Accept and persist the document When a client uploads a document, FastAPI validates the request, checks the user's permissions, and stores the original file in Azure Blob Storage. The application then creates or updates the document metadata in Cosmos DB. At this stage, the document can be marked as PROCESSING until the ingestion pipeline completes. Step 2: Schedule background processing The system creates an ingestion job containing enough information for the worker to locate the source and determine exactly which version to process. For example: { "operationId": "op-789", "operation": "INGEST", "documentId": "policy-123", "documentVersion": 2, "blobPath": "policies/leave-policy-v2.pdf" } The worker should process the specified version rather than blindly reading whatever file happens to exist at a mutable storage path. For systems that overwrite the same blob path, use blob versioning, an immutable version-specific path, or another mechanism that ensures the worker reads the intended content. Step 3: Extract, chunk, and embed The worker downloads the appropriate document and extracts its text. The extracted text is divided into chunks. Each chunk should carry identifiers that connect it to its parent document and version. For example: { "id": "policy-123-v2-chunk-001", "documentId": "policy-123", "documentVersion": 2, "chunkNumber": 1, "content": "Employees are entitled to 20 days of annual leave." } The worker generates an embedding for each chunk and writes the chunk, its metadata, and its vector to Azure AI Search. The exact index schema depends on the retrieval strategy, embedding dimensions, filtering requirements, and whether hybrid search is used. Step 4: Mark the version as indexed After the worker confirms that all required indexing operations succeeded, it updates the document metadata to record the indexed version and processing status. For example: { "id": "policy-123", "currentVersion": 2, "indexedVersion": 2, "status": "ACTIVE" } This update must be conditional on the document still being at version 2. If a newer version has already been uploaded, the older job must not mark itself as the current version. Why idempotency matters Distributed systems can deliver the same job more than once. A worker may finish indexing but fail before acknowledging the queue message. The message can then be delivered again. If every attempt creates new chunk IDs, duplicate content may accumulate in the index. A practical solution is to derive chunk IDs deterministically from the document ID, version, and chunk identifier. Reprocessing the same version then targets the same index records instead of creating a new set each time. This does not eliminate every failure mode, but it makes repeated indexing much safer. Azure Service Bus supports duplicate detection for eligible tiers, but queue-level duplicate detection is not a substitute for idempotent worker logic. Microsoft Learn: Duplicate detection Updating Documents Without Serving Stale Content Document updates are the most interesting part of the lifecycle because they introduce a consistency problem. Imagine the current leave policy is version 1, allowing 15 days. An administrator uploads version 2, allowing 20 days. The worker starts processing version 2, but embedding generation takes time. Meanwhile, users continue querying the application. What should those users see? There are two common strategies. The right choice depends on whether the system prioritizes availability or strict freshness. Strategy A: Make the new version active after indexing succeeds In this approach, the existing active version remains available while the new version is processed. The workflow is: Create version 2 and mark it as processing. Extract text and generate embeddings for version 2. Index all required version 2 chunks. Verify indexing success. Atomically update the authoritative metadata to make version 2 active. Clean up version 1's indexed chunks asynchronously. This minimizes the time during which the document is unavailable. However, it means that version 1 can remain available while version 2 is being processed. That may be acceptable for some knowledge bases but inappropriate for policies that must become effective immediately. Strategy B: Disable the old version as soon as an update is accepted For high-sensitivity documents, the application can immediately mark the old version as ineligible for retrieval. It then processes the new version and activates it only after successful indexing. The trade-off is that the document may temporarily have no eligible version. The application should return a clear message or use an approved fallback rather than silently serving obsolete information. Prevent old jobs from overwriting new versions Consider this sequence: Version 2 starts processing. Version 3 is uploaded before version 2 finishes. Version 3 finishes indexing first. Version 2 finishes later and attempts to update the metadata. Without version checks, the late version 2 job could incorrectly reactivate stale content. The worker must therefore use conditional updates or optimistic concurrency checks against the authoritative document version. A job may complete its indexing work, but it must not activate its version unless it is still eligible to do so. Handle the lack of a cross-service transaction Cosmos DB and Azure AI Search do not participate in a single distributed transaction in this architecture. A metadata update can succeed while an indexing request fails. An indexing request can succeed while the subsequent metadata update fails. The system should account for these partial failures using: Explicit lifecycle states. Conditional version updates. Retryable and idempotent operations. Periodic reconciliation between metadata and indexed records. The important engineering principle is to make incomplete operations detectable and recoverable, rather than assuming every multi-step workflow succeeds atomically. Deleting Documents Safely Deletion requires special treatment because removing a document from the source does not automatically remove its indexed content. More importantly, waiting for physical index cleanup before preventing retrieval creates a window in which content that should no longer be available may still be returned. Step 1: Make the document ineligible for retrieval When an authorized deletion request arrives, the application updates the authoritative metadata to indicate that the document is being deleted or has been logically deleted. The retrieval path must check that status before using retrieved content. For sensitive documents, this check must happen before the content is added to the LLM context. Merely hiding a document in the user interface is insufficient. Step 2: Schedule physical cleanup The application enqueues a deletion job that identifies the document and all indexed records associated with it. The worker queries or otherwise identifies the corresponding chunk keys and deletes those records from Azure AI Search. The deletion operation should be idempotent. Retrying a deletion for an already-removed chunk should not cause the workflow to fail unnecessarily. Step 3: Verify cleanup The worker checks whether the targeted records have been removed and records the cleanup result. If an operation fails, the job should be retried according to a defined policy. Jobs that continue failing should be sent to a dead-letter queue for investigation and controlled recovery. Azure AI Search supports deleting indexed documents by their document keys. Its documentation also describes how to verify deletion and why index statistics may not update immediately. Microsoft Learn: Delete documents A simplified FastAPI deletion endpoint The following example illustrates the API boundary. The helper functions represent application-specific implementations. from fastapi import FastAPI, HTTPException app = FastAPI() @app.delete("/documents/{document_id}") async def delete_document(document_id: str): document = await get_document_metadata(document_id) if document is None: raise HTTPException( status_code=404, detail="Document not found" ) # Must enforce authorization and use a # concurrency-safe lifecycle transition. await mark_document_deleting(document_id) # The job must be published reliably. await enqueue_deletion_job( document_id=document_id, document_version=document["currentVersion"] ) return { "documentId": document_id, "status": "DELETING" } This is an illustrative example, not a complete production implementation. In particular, the metadata transition and message publication must be coordinated reliably. One approach is the transactional outbox pattern: write the lifecycle change and an outbox event in the same Cosmos DB transactional batch when the data model and partitioning allow it, then publish the event asynchronously. The publisher can retry without losing the intent to schedule cleanup. Deletion must also account for in-flight queries Suppose a query retrieves a document's chunks just before the deletion request is processed. The query might still hold those chunks in memory even after the document is marked deleted. For stricter deletion guarantees, the application needs a defined policy for in-flight requests, cache invalidation, and authorization checks immediately before content is sent to the model. If the requirement is that no response may contain content after a deletion takes effect, that guarantee must explicitly cover requests already in progress. Physical cleanup and retrieval eligibility are separate responsibilities. Both matter. Coordinate Lifecycle Changes Reliably Once ingestion and deletion run asynchronously, the queue becomes part of the system's correctness model. A production worker should not assume that each message is delivered exactly once or that messages for a particular document always finish in order. Design for at-least-once processing A practical worker lifecycle is: Receive a message using a lock-based delivery mode. Validate the document ID, version, and operation. Check whether the operation is still eligible to run. Perform idempotent indexing or deletion. Update lifecycle metadata conditionally. Acknowledge the message only after successful processing. If the worker fails before acknowledging the message, the message may be delivered again. That is expected behavior and should be handled by the design. Add retry and dead-letter policies Not all failures should be treated equally. Transient network errors or throttling may succeed after a delay. Invalid documents, unsupported file formats, and persistent schema mismatches may require manual investigation. The system should use bounded retries with appropriate backoff, record meaningful failure details, and route repeatedly failing messages to a dead-letter queue. Use reconciliation as a safety net Even with retries, the system needs a way to detect inconsistencies that escaped the normal workflow. A reconciliation job can compare authoritative metadata against indexed document versions and lifecycle states. It can identify cases such as: A document marked active whose current version is not fully indexed. Chunks belonging to an obsolete version. Search records for a logically deleted document. An operation that remained in a processing state beyond its expected duration. Reconciliation should repair only states it can safely determine. It should not reactivate a version simply because its chunks exist in the index. For applications using Azure Cosmos DB change feed, document metadata changes can also drive incremental background processing. The change feed captures inserts and updates in its standard latest-version mode; capturing deletions requires selecting and configuring an appropriate supported mode or using explicit lifecycle events. Microsoft Learn: Cosmos DB change feed Where Microsoft Agent Framework Fits A common mistake is to assume that every part of an agentic RAG application should be implemented as an AI agent. Document uploads, version transitions, embedding generation, and index deletion are predictable operations with explicit success and failure conditions. These are generally best implemented with conventional application logic and background workers. Microsoft Agent Framework becomes useful when the query itself requires multi-step reasoning, tool selection, or orchestration. For example, a user might ask: “Compare the current leave policy with the previous version and explain the changes that affect employees.” An agent could use approved tools to retrieve the current policy and the permitted historical version, compare the relevant passages, and generate an evidence-based explanation. The application must still control which documents and versions are eligible for retrieval. The agent should not independently decide whether a deleted document is authorized for use. This distinction is important: deterministic workflows protect data integrity; agentic workflows help solve tasks that benefit from reasoning and tool use. Microsoft Agent Framework provides both agent and workflow capabilities, allowing developers to choose an appropriate orchestration model for the task. Microsoft Agent Framework documentation Production Readiness: What Should We Measure? A pipeline that successfully indexes a document once is not necessarily production-ready. The system needs observable lifecycle states and measurable recovery behavior. Area What to validate Ingestion Can a failed upload or indexing job be retried safely? Idempotency Does processing the same document version twice create duplicate records? Version consistency Can a delayed job reactivate an older version? Deletion Can logically deleted content enter the LLM context? Authorization Are tenant and document-level permissions enforced during retrieval? Recovery Can reconciliation detect and repair partial failures? Observability Can operators identify stuck jobs, indexing failures, and cleanup delays? Performance How long does it take for an accepted update to become searchable? Useful operational metrics include ingestion success rate, queue age, indexing latency, retry counts, dead-letter queue depth, time spent in each lifecycle state, and deletion cleanup latency. Also test race conditions deliberately. Upload a new version while an earlier job is still running. Delete a document while a query is in flight. Simulate an indexing failure after metadata has been updated. Restart a worker after it has indexed content but before it acknowledges the message. These tests expose the problems that a happy-path demonstration will not reveal. Bringing It All Together Keeping a RAG system accurate is not simply a matter of re-running embeddings whenever a file changes. It requires a deliberate lifecycle design that connects source documents, versioned metadata, asynchronous processing, search-index operations, and retrieval-time authorization. Azure Blob Storage can preserve the source documents, Cosmos DB can track authoritative lifecycle state, Service Bus can distribute background work, and Azure AI Search can provide retrieval. Microsoft Foundry supplies the models, while Microsoft Agent Framework can support the parts of the application that genuinely benefit from agentic orchestration. The architecture becomes reliable when it assumes that failures will happen: messages may be repeated, jobs may finish out of order, index operations may partially succeed, and cleanup may take time. Version checks, idempotent operations, explicit lifecycle states, reliable event publication, and reconciliation turn those failure modes into manageable engineering problems. The objective is not merely to keep the index populated. It is to ensure that every answer is grounded in information that is current, eligible, and authorized for the user who asked the question. Further Reading Azure AI Search: Delete documents Azure Cosmos DB: Change feed Azure Service Bus: Duplicate detection Microsoft Agent Framework I'd be interested to hear from engineers building production RAG systems: how do you coordinate document updates and deletions across your source of truth and search index?Implementing Next Best Action (NBA) in Foundry with Microsoft-Decision-1
Imagine a sales rep opening their account list at the start of the day. One customer wants a product demo. Another has a larger potential deal, but its requirements may not match what your product can do. A third has asked you not to contact them for another week. A construction permit looks promising, but you are not even sure the applicant is the company in your CRM. You do not need another summary of the list. You need to know: what should I do next? That is the starting point for this demo: a next best action workbench for sales reps, built with Microsoft Foundry. It compares rules, GPT-4o, and Microsoft-Decision-1 against the same evidence. The accounts and evidence are synthetic; the hosted model responses are real. The interesting part is not which model wins. It is how the sales question changes, and what that reveals about the kind of decision support we need. A Bigger Deal Is Not Always the Next Call The first scenario puts four fictional sales motions in front of the rep: Apex: a $76,000 expansion. The buyer has requested a dispatch demo, and the capability exists today. Summit: a $210,000 cross-sell. The buyer wants capabilities that are not all established as currently supported. Coastal: a $158,000 expansion. The customer has explicitly paused sales contact until October 23. A similar-name permit applicant: a $3.1 million construction project, but an unverified account match and unknown software opportunity value. Sorting by the largest number would miss the point. A construction budget is not software revenue. A large opportunity does not justify promising a roadmap feature. A territory's quota pressure does not override a customer's request not to be contacted. So "next best action" is really two questions: which account deserves attention, and what kind of attention is appropriate? Contact now, clarify requirements, defer, and request human review are different outcomes. Doing nothing yet can be the correct one. Some of those decisions should not be left to a model. In this application, code enforces contact restrictions, evidence requirements, and identity checks before any model recommendation is accepted. Coastal's pause is a boundary, not a factor a model can trade against deal size. The unverified applicant needs review, not a confident sales approach. With those boundaries in place, we can compare how each method handles the remaining judgment. First, Try the Simple Answer The first version uses a transparent scoring formula: software opportunity value, territory quota shortfall, a requested meeting, and whether the buyer needs an unavailable capability. In the recorded routine comparison, all three methods agreed on the ranking and next actions. Rules needed no model tokens and were the simplest adequate implementation for that case. That is a useful outcome. If the relevant facts are already explicit and a few conditions capture the decision, adding a model may add latency and cost without adding useful capability. But consider what happens when "meeting requested" stops telling the whole story. The Same Meeting Request Can Mean Different Things The second scenario is a separate authored version of the synthetic evidence, not a claim that these accounts changed in real time. Apex now has the larger seller-entered estimate, but the meeting is exploratory: there is no established buying process or approved budget. Summit has a smaller funded pilot, completed requirements review, and near-term rollout readiness. Both have requested a meeting. Both need supported capabilities. To the fixed formula, those meeting requests look the same. It ranks Apex first. To a rep reading the context, a discovery invitation and a funded pilot are not equivalent signals. We could extend the rules with readiness fields and more conditions. That may be the right choice. But this is also where a different kind of model becomes interesting: one that interprets the evidence and returns a bounded decision rather than a paragraph. Where Decision Models Fit Models such as TypeSafe AI's Jev have brought attention to this decision-first approach. Supply the situation, define the possible answers, and receive structured choices or scores that software can use directly. TypeSafe calls this a System One model. Microsoft-Decision-1 brings that approach to Microsoft Foundry. Instead of asking it to write a recommendation, this application asks two questions for each eligible account: what action fits, and how much priority should it receive? The application defines the available actions and the priority scale. Decision-1 does not generate a written rationale. It returns a selected action and a score. Its API also supports yes/no probability questions. Jev is context for the emerging category, not a model tested in this comparison. In the recorded contextual runs, both Decision-1 and GPT-4o ranked Summit first, while rules ranked Apex first. One earlier run also showed a useful distinction: GPT-4o suggested outreach for Apex; Decision-1 suggested researching it further. The takeaway is not that models understand sales better than rules. It is narrower: the context changed the models' recommendation in a way this particular formula could not express. That is a reason to evaluate contextual judgment, not proof of better revenue outcomes. These are authored teaching cases, and "Summit first" is the intended case criterion, not a measured commercial result. Choosing the Account Is Only the Beginning Now change the question again. It is no longer just "should we pursue the funded pilot?" It becomes: Can we propose a rollout that fits the customer's deadline and budget? A selected action is no longer the complete answer. The rep needs a proposal: phases, dates, costs, and remaining budget. That is the third scenario. All methods receive the same operational facts, but only the generative adapter is implemented to produce a plan. Rules and Decision-1 remain explicitly decision-only. GPT-4o uses a calculation tool for the budget, then returns a structured schedule and proposal. The successful recorded plan finished on October 22, cost $23,200, and left $300 of budget. Application code independently checked phase order, business-day durations, non-overlap, costs, deadline assessment, and supplied references. The path to that result matters. Earlier model attempts produced correct schedules but incorrect costs, and the application rejected them. The fix was to provide an arithmetic tool, not weaken the checks or substitute a prewritten answer. This is a role for generation alongside deterministic tools. It is not a claim that only an LLM can solve a schedule: a purpose-built scheduler could solve these fixed constraints too. It shows why choosing an action and producing a usable plan are different tasks. The Use Case Gives Us the Framework We started with one sales question, but uncovered three kinds of work: What the rep needs A mechanism to consider What still belongs in code An action from explicit, structured facts Rules The conditions, formula, and permitted actions. A contextual choice within known options A bounded decision model, compared with a structured-output LLM Evidence checks, action boundaries, and output validation. A proposed plan or other generated artifact A generative LLM with tools, or a purpose-built solver where appropriate Calculations, constraint checks, and approval before action. This is why I find "rules, bounded decisions, and generation" more useful here than simply "deterministic versus non-deterministic." Repeatability alone does not tell us whether a recommendation is useful or correct. The required output and the cost of an error tell us more. These mechanisms can coexist in one workflow. Keep hard boundaries deterministic. Use contextual judgment where it adds value. Use generation when you need a generated artifact. Microsoft Agent Framework coordinates the comparison: What This Demo Does, and Does Not, Show The comparison is deliberately small and inspectable. Every method receives the same prepared evidence; expected teaching outcomes stay out of model input. In the recorded decision-only runs, Decision-1 had lower measured branch time and estimated token cost than GPT-4o. Those are single-run observations, not a general speed, quality, or savings benchmark. The planning case performs additional work and is not a like-for-like latency comparison. The scenarios use a fixed simulation time of October 15, 2026, at 12:00 UTC. The primary demo retrieves versioned synthetic snapshots from Azure AI Search, not live CRM or live IQ-agent responses. It does not turn historical records into fresh facts. The workbench opens editable synthetic drafts; it sends no outreach and makes no CRM changes. "Best" therefore means a suggested next action under the supplied evidence and rubric, not a proven optimal action or a prediction of sales success. A valid response shape or evidence reference does not establish a correct judgment. Production use would need representative held-out evaluation, verified access controls, and appropriate human approval. The practical starting point is simple: take a decision your users already make, define the available actions, identify the non-negotiable boundaries, and compare the simplest adequate implementation with the alternatives. Let the use case earn the complexity. Try the Workbench The decision-lead-agent-demo repository contains the local workbench and the three scenarios. Follow the local setup instructions to reproduce the comparison with approved model deployments and credentials. Hosted calls can incur charges. Start with the routine case, where all three may agree. Then inspect what changes in the contextual case, and what extra work the planning task requires. The question to carry into your own application is not "where can I add AI?" It is "what does the next action require that my current approach cannot provide?" Technical Walkthrough: The Code Behind the Comparison The story above does not require reading the implementation. For builders, the following sections retain the exact rules and invocation code, pinned to commit d1a16a5. Microsoft Agent Framework runs each method against an isolated copy of the same prepared snapshot. Shared checks restrict actions before the decision and validate the result afterward. Invalid results are rejected rather than repaired and reported as successes. Snapshot fingerprints verify comparable inputs; evidence-reference checks verify membership, not the truth of a model's judgment. 1. The Rules Baseline The baseline is intentionally transparent. It weights capped software opportunity value at 30%, proportional territory quota shortfall at 20%, a requested meeting at 30%, and no unavailable-capability requirement at 20%. It scales the result to 0-3. Here is the complete rules runner from the implementation at the demo commit. The territory-specific branch supports the separate live research mode; the synthetic comparison uses the opportunity formula. async def rules_runner(snapshot: dict[str, Any]) -> dict[str, Any]: suggestions = [] for candidate in snapshot["candidates"]: signals, policy = candidate["buyingSignals"], candidate["policy"] performance = candidate["territoryPerformance"] gap = max(0, performance["quota"] - performance["revenue"]) / performance["quota"] score = ( 30 * min((candidate["opportunityAmount"] or 0) / 250000, 1) + 20 * min(gap, 1) + 30 * (signals["meetingRequested"] is True) + 20 * (signals["requiresUnavailableCapability"] is False) ) if snapshot.get("scope") == "territory-prospecting": score = 100 * min(gap, 1) action = "outreach" if signals["requiresUnavailableCapability"] is False and signals["meetingRequested"] is True else "research" if not {"outreach", "research"}.intersection(policy["allowedActions"]): action, score = ("defer" if "defer" in policy["allowedActions"] else "cannot_tell"), 0 suggestions.append({ "candidateId": candidate["candidateId"], "action": action, "priority": round(score * 3 / 100, 4), "evidenceIds": [item["evidenceId"] for item in candidate["evidence"]] + [item["evidenceId"] for item in snapshot["productEvidence"]], "basis": (f"Territory research only: proportional quota shortfall {gap:.2f}; no inferred buyer intent." if snapshot.get("scope") == "territory-prospecting" else f"Rules: value {min((candidate['opportunityAmount'] or 0) / 250000, 1):.2f}; quota gap {gap:.2f}; meeting {signals['meetingRequested']}; unavailable capability {signals['requiresUnavailableCapability']}."), }) return validate_recommendations({"status": "ok", "model": "Deterministic rules v1", "suggestions": suggestions, "usage": None, "inferenceCostUsd": 0}, snapshot) These weights are demonstration heuristics, not validated sales economics. Their advantage is that their behavior is easy to inspect. Their limitation is equally concrete: the formula does not read whether a meeting is exploratory or follows an approved, funded pilot. That limitation is not inherent to all rules systems. We could add structured readiness fields or more rules. The question is whether maintaining that logic is preferable to using a model for the contextual part. 2. Invoke Microsoft-Decision-1 Decision-1 is not a drop-in model-name change on the chat endpoint. It uses a different request contract: POST <resource-origin>/providers/microsoft/v1/systemone The request contains the deployment name, shared state, and questions. The following is the complete adapter method from the model adapters. Its surrounding class supplies the HTTP transport; policy_exclusions, ACTIONS, and token_cost are repository helpers. async def decision1(self, snapshot): rubric = snapshot.get("rubric", RUBRIC) priority_criteria = (["No research priority or review required", "Low research priority", "Moderate research priority", "High research priority"] if snapshot.get("scope") == "territory-prospecting" else ["Not actionable or review required", "Exploratory", "Timely but uncertain", "Ready and timely"]) questions, suggestions = {}, policy_exclusions(snapshot) for candidate in snapshot["candidates"]: candidate_id = candidate["candidateId"] allowed = candidate["policy"]["allowedActions"] if not {"outreach", "research"}.intersection(allowed): continue questions[f"action_{candidate_id}"] = { "type": "choice", "instructions": f"{rubric} Choose the next action for {candidate_id}.", "criteria": {action: ACTIONS[action] for action in allowed}, } questions[f"priority_{candidate_id}"] = { "type": "score", "instructions": f"{rubric} Rate attention priority for {candidate_id}.", "criteria": priority_criteria, } if not questions: return {"status": "ok", "model": "No model call: all candidates policy-gated", "suggestions": suggestions, "usage": None, "inferenceCostUsd": 0} response = await self.transport( os.environ["DECISION1_ENDPOINT"].rstrip("/") + "/providers/microsoft/v1/systemone", {"model": os.environ["DECISION1_DEPLOYMENT"], "state": snapshot, "questions": questions}, ) answers = response["answers"] for candidate in snapshot["candidates"]: candidate_id = candidate["candidateId"] if not {"outreach", "research"}.intersection(candidate["policy"]["allowedActions"]): continue action_answer, score_answer = answers[f"action_{candidate_id}"], answers[f"priority_{candidate_id}"] if action_answer.get("type") != "choice" or score_answer.get("type") != "score": raise ValueError("Unexpected Decision-1 answer type") suggestions.append({"candidateId": candidate_id, "action": action_answer["choice"], "priority": score_answer["score"], "evidenceIds": supplied_ids(candidate, snapshot), "basis": "Supplied evidence references; Decision-1 provides no written rationale."}) return {"status": "ok", "suggestions": suggestions, "usage": response.get("usage"), "model": response.get("model", os.environ["DECISION1_DEPLOYMENT"]), "inferenceCostUsd": token_cost(response.get("usage"), "DECISION1")} Two details matter. First, each question identifies the candidate in its instructions, not only in its dictionary key. Second, action criteria come from the application's policy-allowed set. Related action and priority questions share one request and one state. The four score levels run from 0 to 3; a returned score can fall between levels. The demo consumes the selected action and score, not the full probability distributions. The evidence IDs attached here are supplied references, not model-generated citations or a written explanation. 3. Invoke GPT-4o With Structured Output The LLM receives the same snapshot and qualitative rubric, but uses Chat Completions with a strict JSON schema. The basic comparison asks for decisions, not a persuasive paragraph. That gives the LLM a bounded task too, rather than making it generate an explanation that Decision-1 cannot provide. These are exact excerpts from HostedModels.llm, not a standalone script. The method derives eligible_ids from policy and defines this schema: item_schema = { "type": "object", "additionalProperties": False, "properties": {"candidateId": {"type": "string", "enum": eligible_ids}, "action": {"type": "string", "enum": ["outreach", "research", "cannot_tell"]}, "priority": {"type": "number"}, "evidenceIds": {"type": "array", "items": {"type": "string"}}}, "required": ["candidateId", "action", "priority", "evidenceIds"], } schema = {"type": "object", "additionalProperties": False, "properties": {"suggestions": {"type": "array", "items": item_schema}}, "required": ["suggestions"]} For the decision-only task, plan_instruction is "Do not generate an explanation." The payload and endpoint are: payload = { "model": os.environ["LLM_DEPLOYMENT"], "messages": [{"role": "system", "content": rubric + f" Return JSON suggestions ONLY for these eligible candidate IDs: {json.dumps(eligible_ids)}. The application supplies excluded candidates separately. Use candidateId, action, priority and evidenceIds. " + plan_instruction}, {"role": "user", "content": json.dumps(snapshot)}], "response_format": {"type": "json_schema", "json_schema": {"name": "seller_priorities", "strict": True, "schema": schema}}, } endpoint = os.environ["LLM_ENDPOINT"].rstrip("/") + "/openai/v1/chat/completions" After any optional planning-tool interaction, the actual call and parsing are: response = await self.transport(endpoint, payload) responses.append(response) result = json.loads(response["choices"][0]["message"]["content"]) The schema constrains response structure. Shared application validation still checks policy, candidate coverage, score bounds, and evidence references. Structured output is not a substitute for those checks. 4. Run the Demo Locally To try the story yourself, clone the demo repository and open it in WSL. You need Node.js/npm compatible with the project, Python 3.13, and uv. For the full comparison, you also need access to existing GPT-4o and Microsoft-Decision-1 deployments and an Azure AI Search index containing the synthetic snapshots. Starting the local app does not provision those services. Configure your environment. Create a root .env using the repository's .env.example as a template. Set these values for your own resources: Setting What to provide LLM_ENDPOINT / LLM_DEPLOYMENT Your GPT-4o resource origin and deployment name. DECISION1_ENDPOINT / DECISION1_DEPLOYMENT Your Decision-1 resource origin and deployment name. DECISION_RECORDS_SEARCH_ENDPOINT Your Azure AI Search service endpoint. DECISION_RECORDS_SEARCH_INDEX decision-demo-snapshots-v1, populated with the repository's canonical records. Model endpoints must be HTTPS resource origins, not project URLs or complete API paths. Sign in with a local Azure developer identity permitted to invoke both models and read the Search documents; the backend uses that identity, not the simulated UI persona. No credentials belong in the browser configuration. Follow the snapshot-seeding instructions to populate your own index before comparing. Setting its name alone does not create or load it. The seeding tool offers a credential-free preview; uploading requires approved access and index/document-write permissions. The focused three-tab UI retrieves these stored synthetic records and does not silently substitute local fixtures if retrieval fails. You do not need to deploy the separate IQ agents for this path. Start the comparison backend. From the repository root in a WSL terminal: uv venv --python 3.13 .venv uv pip install --python .venv/bin/python -r agent/requirements-workflow.txt npm ci npm run workflow The backend listens on http://127.0.0.1:8008. Restart it after changing environment settings. Start the workbench. In a second WSL terminal, from the same repository root: npm run dev Open http://localhost:5175/. If that port is occupied, run npm run dev -- --port 5176 instead and open http://localhost:5176/. Use the development server, not vite preview: the development server forwards comparison requests to the local backend. Walk through the three scenarios. Select a scenario tab, inspect the account context, then press Compare approaches. Switching tabs does not itself call a model. Start with the routine case, move to the discovery-versus-readiness case, and finish with the rollout plan. Compare the returned actions and ranks, then inspect branch times, token estimates, and the plan's independent checks. If a branch is unavailable or fails, treat that as an incomplete comparison, not a model recommendation. Hosted inference and Search can incur charges. The deployment used for the recorded demo permits one Decision-1 request per minute, so allow at least a minute between comparisons on that deployment; your own limits may differ. This is a local development app: keep the backend on loopback and do not expose it publicly. 5. Measurement Details The repository records these hosted browser observations from October 16, 2026. Each comparison confirmed matching prepared snapshot fingerprints across branches. Scenario Observed result Branch time / estimated inference token cost Routine, 06:06 UTC All methods agreed on ranks and actions. Rules: 0.13 ms / $0; GPT-4o: 3,364.12 ms / $0.003690; Decision-1: 2,570.10 ms / $0.000110418. Contextual, 06:07 UTC Both models ranked Summit first; rules ranked Apex first. GPT-4o: 6,509.38 ms / $0.003795; Decision-1: 3,619.02 ms / $0.000115248. Decision plus plan, 06:04 UTC Tool-assisted GPT-4o plan passed independent checks. Other adapters supplied no plan. GPT-4o: 7,386.28 ms / $0.016510, including both requests. These are single-run observations on deliberately authored synthetic cases, not latency distributions, a held-out accuracy study, or a general savings claim. A future run can produce different timings or decisions. GPT-4o is the existing general-purpose baseline, not an exhaustive search for the best alternative model. Costs use returned token usage and configured retail rates. Cached GPT-4o input is priced separately without double-counting. Estimates exclude Search, IQ retrieval, hosting, taxes, and contract-specific adjustments; $0 for rules means no inference token charge, not zero operating cost. Microsoft's launch pricing lists Decision-1 at $0.042 per million input tokens with free output. Recheck current pricing, deployment availability, and preview lifecycle before reproducing the experiment. Before relying on model scores, evaluate representative held-out cases, paraphrases, and option ordering. Measure abstentions, invalid outputs, failures, latency distributions, and cost per successfully validated task. A priority score is not a probability of closing a sale, and matching actions or rankings does not imply calibrated score equivalence. For model setup and the current API contract, see Deploy and use Microsoft-Decision-1 in Microsoft Foundry.
Building Permission-Aware Hosted Agents for SharePoint in Foundry Agent Service
Organizations increasingly publish agents to Microsoft Teams and Microsoft 365 Copilot that answer questions using internal knowledge sources. SharePoint is a very common source for this information; where many times access is different for every user. A finance employee, HR employee, and project manager may all ask the same question but have access to different documents. When an agent is hosted in Foundry Agent Service, the agent itself runs under its own identity. This creates an important challenge: how can retrieval respect the permissions of the person asking the question rather than the permissions of the agent? This post shows how to do that with built-in capabilities: a Foundry IQ knowledge base with a remote SharePoint knowledge source, connected to the agent through the Foundry toolbox. Foundry IQ is the knowledge layer for agents, built on Azure AI Search. A knowledge base is its top-level resource: it orchestrates retrieval across one or more knowledge sources, which are connections to indexed or remote content. In this solution the only knowledge source is SharePoint, queried live as the signed-in user through the On-Behalf-Of (OBO) pattern, and the agent reaches the knowledge base through a toolbox. Why agent identity is not enough Hosted agents run as their own agent identity. When Foundry Agent Service runs your Microsoft Agent Framework agent as a hosted agent, it authenticates as the agent, not as the person chatting with it. SharePoint permissions belong to users. Two people asking the same question may be allowed to see different documents. So grounded answers (RAG) need per-user retrieval. If retrieval runs as the agent, SharePoint can't check the asking user's access. Results are either empty or not filtered for that user. Therefore the user's token has to reach the retrieval step. Changing the model or the prompt can't fix this. The architecture has to carry the user's identity all the way to SharePoint. This is the key architectural principle behind this solution. The hosted agent keeps using its own identity for model inference, while retrieval runs with the signed-in user's identity. What you'll build A hosted agent, published to Microsoft Teams, that answers from one or more SharePoint sites. Answers limited to what each user can open in SharePoint, using On-Behalf-Of (identity passthrough) retrieval. Clickable citations back to the source documents. Built on out-of-the-box Foundry IQ and Foundry toolbox capabilities: no custom server to host, and no client secrets in the retrieval path. The complete sample is on GitHub: SharePoint knowledge base sample The sample repository contains the setup scripts and agent code used in this walkthrough. Before we run them, let’s trace how the user’s identity flows through the architecture and why it matters for permission trimming. Note: Remote SharePoint knowledge sources in Foundry IQ were in preview at the time this article was written. How it works The agent runs as itself. Retrieval runs as the user. Three pieces carry the user's identity end to end: FoundryToolbox in the agent sends the per-request call ID with each tool call, so Foundry knows which user the call belongs to. A UserEntraToken connection passes that user's Microsoft Entra ID token to the Foundry IQ knowledge base on Azure AI Search. This is identity passthrough (On-Behalf-Of): every request downstream runs as the signed-in user. A remote SharePoint knowledge source queries SharePoint live through the Microsoft 365 Copilot Retrieval API as that user, scoped to the site paths you choose. Nothing is copied into an index. Why not Work IQ? Work IQ is a good choice when an agent should reason over a user’s broader Microsoft 365 work context. This pattern is intended for scenarios where the agent should answer from specific SharePoint sites, treating those sites as a defined knowledge boundary. Use Work IQ when broad Microsoft 365 context is appropriate. Use this pattern when retrieval should be limited to selected SharePoint content. The right choice depends on the scope and behavior your scenario requires. Before building the sample, let’s check the services and permissions the setup requires. Before you start You need a Foundry project with a model deployment, an Azure AI Search service and a SharePoint site containing the content you want the agent to use.The Search service must be in a region that supports agentic retrieval, in the same Microsoft Entra tenant as Microsoft 365. Make sure the following permissions are in place: Role Required permissions Setup user Search Service Contributor on the Azure AI Search service, and rights to create connections and toolboxes in the Foundry project End users Search Index Data Reader on the Search service, Foundry Agent Consumer on the agent, a Microsoft 365 Copilot licence, and access to the documents in SharePoint With the concepts established, let's build the end-to-end solution. Build it in four steps Clone the sample repository before running the setup scripts. The commands below assume you are running them from the repository root: git clone https://github.com/Heenanl/hosted-agent-sharepoint-knowledge-base.git Set-Location hosted-agent-sharepoint-knowledge-base python -m pip install -r setup/requirements.txt Copy-Item setup/.env.example setup/.env Fill in setup/.env with your Foundry project, Azure AI Search, and SharePoint knowledge source values. The repository README contains the complete configuration and deployment instructions. The steps below highlight the key settings and decisions. 1. Create the knowledge base Run setup/create_knowledge_base.py . It creates a remote SharePoint knowledge source and a knowledge base. The setting that limits retrieval to your site is: "filterExpression": "Path:\"https://<TENANT>.sharepoint.com/sites/<SITE>/\"" 2. Connect it to Foundry with the user's identity Run setup/create_connection.py . It registers the knowledge base's MCP endpoint as a Foundry connection. The setting that matters most in the whole architecture is: "authType": "UserEntraToken" With UserEntraToken , Foundry forwards the signed-in user's token instead of a shared identity, so SharePoint can apply that user's permissions. Then run setup/create_toolbox.py . It wraps the connection in a toolbox that exposes only knowledge_base_retrieve . 3. Build the agent The agent itself is small. The key line is tools=FoundryToolbox(credential) : agent = Agent( client=FoundryChatClient(project_endpoint=endpoint, model=model, credential=credential), instructions=INSTRUCTIONS, tools=FoundryToolbox(credential), ) Two instructions in the agent's prompt made a visible difference in Teams: Cite every source as a markdown link, using the Title and uri fields the tool returns. If the tool returns nothing relevant, say that the available sources do not contain the answer. Do not guess. The first gives users clickable citations. The second stops the model from filling gaps when a user can't see a document. 4. Deploy and publish to Teams Follow the sample README to initialize the agent with azd ai agent init , set the required environment values, and deploy it with azd up . After deployment, publish the agent to Microsoft Teams and Microsoft 365 Copilot. The repository includes a publishing script, including support for Foundry projects on a private network. Users do not need a separate, tool-specific consent flow. Prove the permission trimming A good answer doesn't prove the right permissions were used. Test with two users and one document that only one of them can open: User SharePoint access Result in Teams A Can open the document Answer from the document, with a citation link B Cannot open the document "The available sources do not contain the answer." In our testing, both users' requests reached the knowledge base, but only user A got content from the document, because the Microsoft 365 Copilot Retrieval API ran as each user. Run the test in separate conversations, and repeat it after any permission change. Common pitfalls Using a managed identity for the connection The retrieval runs as the agent's managed identity, so SharePoint has no user to check permissions against. In our testing, a ProjectManagedIdentity connection failed with x-ms-query-source-authorization is invalid . Use UserEntraToken . Forgetting Search Index Data Reader Because each user's own token reaches Azure AI Search, every user needs this role, not just you. Otherwise the user can reach the agent, but retrieval fails for them. Assign the role to a security group once, replacing SEARCH_SERVICE , RESOURCE_GROUP and $GROUP_ID with your own values: $SEARCH_ID = az search service show -n SEARCH_SERVICE -g RESOURCE_GROUP --query id -o tsv az role assignment create --assignee $GROUP_ID --role 'Search Index Data Reader' --scope $SEARCH_ID Using a custom MCP client instead of FoundryToolbox A hand-built MCP client that attaches only the agent's credential drops the per-request call ID, which links a tool call to its user. In our testing with another OAuth tool, every user ended up running as whoever had consented first. FoundryToolbox fixed it. Building a custom MCP proxy A custom On-Behalf-Of (OBO) proxy can work, but you then own its hosting, secrets, token checks and patching. The knowledge base gives the same per-user retrieval with built-in components. Once the setup and permission checks are complete, use the sample repository to try the full flow in your own environment. The links below provide more detail on the Foundry IQ and toolbox building blocks. Get started Try it: clone the sample and follow the README end to end. Learn the building blocks: Create a remote SharePoint knowledge source Connect a Foundry IQ knowledge base to Foundry Agent Service Toolbox authentication What is a Foundry toolbox? Use a toolbox with a hosted agent Validate before rollout: use the two-user isolation checklist. Share your scenario: open an issue on the repo. Acknowledgements Thanks to Mahya Gheini and Linda Li from the Microsoft Foundry product team for their guidance on toolboxes and knowledge bases.
Introducing Dragon HD Omni: Azure Speech New Voice Type Now in Preview via Microsoft Foundry
Dragon HD Omni is Microsoft Azure Speech’s newest text‑to‑speech generation, delivering over 700 high‑quality voices with enhanced expressiveness, multi‑lingual fluency, and multi‑style control — all through a unified model built in Microsoft Foundry. It removes common developer pain points such as unnatural voice prosody, limited language coverage, and heavy SSML tuning effort. The result is a powerful value proposition: faster integration, richer user experiences, and production‑ready voice output with minimal effort. Azure speech offers a broad range of unique voices for applications like virtual agents, audiobooks, podcasts, and speech-to-speech tasks. Demo video 700+ prebuilt voices Dragon HD Omni offers a range of prebuilt voices with distinct personas and emotions, supporting diverse use cases from agent-based applications to content creation. These voices unlock endless possibilities, empowering users to enhance end-to-end applications. Full update for previous generation voices Dragon HD Omni merges a wide range of prebuilt voices into one, improving contextual adaptation, prosody, expression, and keeping each voice's unique character. This technology delivers more accurate, flexible, and lifelike speech for a variety of uses. Dragon HD Omni raises the standard for natural AI voices across customer service, accessibility, and creative projects, advancing human-computer interaction. You can explore some voices from voice list, such as: "en-US-Ava:DragonHDOmniLatestNeural" "en-US-Andrew:DragonHDOmniLatestNeural" "en-US-Dana:DragonHDOmniLatestNeural" "en-US-Caleb:DragonHDOmniLatestNeural" "zh-CN-Xiaoyue:DragonHDOmniLatestNeural" "zh-CN-Yunqi:DragonHDOmniLatestNeural" "en-US-Phoebe:DragonHDOmniLatestNeural" "en-US-Lewis:DragonHDOmniLatestNeural" They will be available to try directly via Speech Playground - Microsoft Foundry Or, you can use this voice name format by adding the suffix `:DragonHDOmniLatestNeural` to try the Omni version of the given voice via direct SSML call. For example: Previous neural voice Omni version voice name de-DE-ConradNeural de-DE-Conrad:DragonHDOmniLatestNeural AI-Generated Voices Dragon HD Omni now features nearly 300 brand‑new AI‑generated voices, carefully designed to deliver an unprecedented range of vocal diversity. These voices aren’t just more of the same — they’re built to give you choice, flexibility, and creative control. With variations across: Gender – male, female, and non‑binary options Age – youthful, mature, and senior tones Pitch & tone – from warm and friendly to authoritative and professional This expanded library means you can: Personalize experiences for different audiences, whether you’re building an educational app, a customer support bot, or a storytelling platform. Strengthen brand identity by selecting voices that reflect your company’s personality and values. Increase inclusivity with diverse vocal styles that resonate across cultures and communities. Unlock creativity by experimenting with unique voice personalities for podcasts, games, or immersive experiences. Speaker name – Description Sample en-us-graphiterhodium - A bold and dramatic male voice en-us-olivepoivre - An adult female voice that is calm and soothing. Check the full Dragon HD Omni voice list at here. Styles control Standard Azure voices have limited styles due to extensive tuning requirements. The Dragon HD Omni introduces automatic style prediction using natural language descriptions, enabling advanced customization, broader style support, reduced cost, and improved expressiveness. In the initial release, styles will launch for en-US-Ava and en-US-Andrew. Supported styles angry, chill surfer, confused, curious, determined, disgusted, embarrassed, emo teenager, empathetic, encouraging, excited, fearful, friendly, grateful, joyful, mad scientist, meditative, narration, neutral, new yorker, news, reflective, regretful, relieved, sad, santa, shy, soft voice, surprised Note that style result will be strongly influenced by the input content. SSML example <speak version="1.0" xmlns="http://www.w3.org/2001/10/synthesis" xmlns:mstts="http://www.w3.org/2001/mstts" xml:lang="en-US"> <voice name="en-us-ava:DragonHDOmniLatestNeural"> <mstts:express-as style="cheerful"> Wow! What an amazing day! I feel so full of energy, and everything around me seems brighter. My voice is bubbling with excitement, and I can’t stop smiling. I’m ready to take on anything that comes my way—let’s celebrate this wonderful moment together! </mstts:express-as> </voice> </speak> Multilingual and Accents All Dragon HD Omni voices support multiple languages, with the capability that can automatically predicting and generating output based on the input text. Additionally, you may utilize the tag to adjust speaking languages and accents, such as fr-FR for French, de-DE for German, etc. For a comprehensive list of supported languages and their associated syntax and attributes, please refer to the lang element. SSML example <speak version="1.0" xmlns="http://www.w3.org/2001/10/synthesis" xmlns:mstts="http://www.w3.org/2001/mstts" xml:lang="en-US"><voice name="en-us-ava:Dragon HD OmniLatestNeural"><lang xml:lang="fr-FR"> Bonjour ! Ce matin, j’ai pris un café au jardin du Luxembourg. Il faisait frais, mais très agréable. Ensuite, j’ai acheté une baguette et quelques macarons. Paris est vraiment charmant.</lang> </voice> </speak> Word Boundary Event Support Dragon HD Omni supports the word boundary event, which allows developers to track the precise timing of each word as it is spoken. This feature is essential for applications requiring word-level synchronization, such as karaoke, real-time captioning, or interactive voice experiences. When the event fires, it provides: Text: The word spoken AudioOffset: The time offset in the audio stream (milliseconds) TextOffset: The position of the word in the input text Example: Python Sample Using Wordboundary Event in Azure Speech SDK import azure.cognitiveservices.speech as speechsdk def word_boundary_cb(evt): print(f"Word: '{evt.text}', AudioOffset: {evt.audio_offset / 10000}ms, TextOffset: {evt.text_offset}") speech_config = speechsdk.SpeechConfig(subscription="YourSubscriptionKey", region="YourServiceRegion") synthesizer = speechsdk.SpeechSynthesizer(speech_config=speech_config) synthesizer.synthesis_word_boundary.connect(word_boundary_cb) ssml = """ <speak version="1.0" xmlns="http://www.w3.org/2001/10/synthesis" xmlns:mstts="http://www.w3.org/2001/mstts" xml:lang="en-US"> <voice name="en-us-ava:DragonHDOmniLatestNeural"> Hello Azure, welcome to Dragon HD Omni! </voice> </speak> """ result = synthesizer.speak_ssml_async(ssml).get() Sample Output: Word: 'Hello', AudioOffset: 110.0ms, TextOffset: 182 Word: 'Azure', AudioOffset: 590.0ms, TextOffset: 188 Word: ',', AudioOffset: 1110.0ms, TextOffset: 193 Word: 'welcome', AudioOffset: 1270.0ms, TextOffset: 195 Word: 'to', AudioOffset: 1750.0ms, TextOffset: 203 Word: 'Dragon HD Omni', AudioOffset: 1910.0ms, TextOffset: 206 Word: '!', AudioOffset: 2750.0ms, TextOffset: 216 Parameters Dragon HD Omni supports advanced parameter tuning to help you customize voice output for different scenarios. This guide explains each parameter in simple terms and provides recommendations for adjusting them based on your goals. Overview Parameter Default Range Purpose temperature 0.7 0.3 – 1.0 Controls creativity vs. stability top_p 0.7 0.3 – 1.0 Filters output for diversity top_k 22 1 – 50 Limits number of options considered cfg_scale 1.4 1.0 – 2.0 Adjusts relevance and speech speed Tuning for Expressiveness vs. Stability Higher values for temperature, top_p, and top_k result in more expressive, emotionally varied speech. Lower values produce more stable and predictable output. Recommendation: To increase expressiveness, raise all three parameters together. Keep top_p equal to temperature for best results. Tuning for Speed and Contextual Relevance cfg_scale affects how quickly the voice speaks and how well it aligns with the context. Higher values (e.g., 1.8–2.0): faster speech, stronger contextual relevance. Lower values (e.g., 1.0–1.2): slower speech, less contextual alignment. Suggested Tuning Strategies Goal Suggested Adjustment More expressive Increase temperature, top_p, and top_k together More stable Lower temperature first, then adjust top_p if needed Faster & relevant Increase cfg_scale Slower & neutral Decrease cfg_scale The following table describes the usage of the parameters above: Single parameter: <speak version="1.0" xmlns="http://www.w3.org/2001/10/synthesis" xmlns:mstts="http://www.w3.org/2001/mstts" xml:lang="en-US"> <voice name="en-us-ava:Dragon HD OmniLatestNeural" parameters="top_p=0.8"> Hello Azure! </voice> </speak> Multiple parameters: <speak version="1.0" xmlns="http://www.w3.org/2001/10/synthesis" xmlns:mstts="http://www.w3.org/2001/mstts" xml:lang="en-US"> <voice name="en-us-ava:Dragon HD OmniLatestNeural" parameters="top_p=0.8;top_k=22;temperature=0.7;cfg_scale=1.2"> Hello Azure! Hello Azure! </voice> </speak> Get Started In our ongoing journey to enhance multilingual capabilities in text to speech (TTS) technology, we strive to deliver the best voices to empower your applications. Our voices are designed to be incredibly adaptive, seamlessly switching between languages based on the text input. They deliver natural-sounding speech with precise pronunciation and prosody, making them invaluable for applications like language learning, travel guidance, and international business communication. Microsoft offers an extensive portfolio of over 600 neural voices, covering more than 150 languages and locales. These TTS voices can quickly add read-aloud functionality for a more accessible app design or provide a voice to chatbots, elevating the conversational experience for users. With the Custom Neural Voice capability, businesses can also create unique and distinctive brand voices effortlessly. With these advancements, we continue to push the boundaries of what’s possible in TTS technology, ensuring that our users have access to the most versatile, high-quality voices for their needs. For more information Try our demo to listen to existing neural voices Add Text to speech to your apps today Apply for access to Custom Neural Voice Join Discord to collaborate and share feedback Contact us ttsvoicefeedback@microsoft.com
