Microsoft Foundry Guardrails Getting in Your Way? Here’s How to Dial Them Down
How This All Started So here’s the story. I just got back from a trip and had a pile of footage sitting on my laptop. Being the lazy (sorry, efficient) person I am, I fired up OpenCode and asked GPT-6 Astra, running on Microsoft Foundry, to cut me a travelogue. Nothing fancy: under two minutes, nice lighting, clean transitions, no cringy effects, a quick QA before showing me, and the output in its own folder. Easy, right? Nope. This is what I got instead: “Image processing blocked due to content policy violation.” Seriously? It’s holiday footage! Nothing even remotely dodgy in there. This is a classic false positive from the default guardrails, and the good news is it’s totally fixable. Let me show you how. My Setup Quick context before we dive in: I’ve got two models deployed on Microsoft Foundry, gpt-6-astra and gpt-6-sol. Both were running on Microsoft’s out-of-the-box guardrail. Step 1: Find the Guardrails Page Head over to the Microsoft Foundry portal, click Build, then hit Guardrails in the left menu. You’ll see three guardrails that Microsoft gives you by default: Microsoft.Default, Microsoft.DefaultV2 and Microsoft.MAIDefault. Microsoft.DefaultV2 is the one every new deployment gets, which is why it’s sitting on both of my models. Here’s the catch: you can’t edit or delete these Microsoft-managed defaults. So instead of tweaking them, we’re going to build our own guardrail and swap it in. Step 2: Create Your Own Guardrail Smash that "Create" button and you’ll land on the Create guardrail page. This is where all the knobs and switches live: Every control has three bits: the risk type, the intervention point (does it check what you send in, what the model spits out, or both?) and the action. The magic trick for loosening things up is flipping the action from Block to Annotate. With Annotate, Foundry still scans the content and tags it in the API response, but it stops slamming the door on your request. So What Does Each Setting Actually Do? Before you go on a switching-off spree, it’s worth knowing what each of these does and what you’re giving up when you loosen it. Here’s the quick tour: Jailbreak: This one catches prompts trying to trick the model into ignoring its rules. On Block, those prompts get rejected outright. On Annotate, they go through with a flag. Turn it off completely and you’re trusting the model’s own training to keep it in line. Network (egress rules): Controls which outbound calls a hosted agent is allowed to make. As the portal points out, it only applies to hosted agents, so for plain model deployments like mine it doesn’t change a thing. Indirect prompt injections: Watches user input and tool responses (files, docs, web pages the model reads) for sneaky instructions someone has planted. Leave it on and your agents are protected when they read outside content; switch it off and a dodgy file could quietly hijack your model. For an agentic tool like OpenCode, which reads files and runs shell commands, I’d honestly keep this one on, even if it’s just on Annotate. Spotlighting (Preview): Tags external content inside the prompt so the model can tell your real instructions apart from random untrusted data. Think of it as an extra seatbelt against indirect attacks. Content harms (Hate, Sexual, Self-harm, Violence): Each of these has a severity slider that starts at Medium blocking, meaning anything rated medium or higher gets blocked. Slide it down to Lowest blocking and only the really nasty stuff gets stopped, which kills off most false positives like mine. The asterisk means these four are mandatory: you can turn the dial down, but you can’t switch them off. Blocklists: Want to ban specific words or phrases, like profanity or your competitor’s name? This is where you do it. It’s off by default. Protected material for code and text: Checks whether the model is about to spit out known copyrighted text (song lyrics, articles and so on) or code lifted from public repos. Block stops it; Annotate lets it through with a flag. Switch it off and you’re rolling the dice on your app reproducing someone else’s copyrighted work. Step 3: Pick Your Models Hit Next and Foundry asks which agents and models you want this guardrail on. Any model you’ve already deployed in your project shows up here. For me that’s gpt-6-astra and gpt-6-sol, so I ticked both. Step 4: Name It and Pick a Streaming Mode One more Next and you’re on the Review page. Give your guardrail a name (I went with NoGuardrails, because subtlety isn’t my thing) and pick a streaming mode. You’ve got two choices: Default: Foundry buffers the response and runs it through the guardrail before each chunk goes out. Nothing reaches the user until it’s been checked. 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