Agent in Azure AI Foundry not able to access SharePoint data via C# (but works in Foundry portal)

The most common reason for the “Run status: failed” error is that the SharePoint tool isn’t properly bound to the agent during your programmatic call. Even if the agent was created with the tool, you still need to make sure the connection ID is passed correctly, and that your message actually references the SharePoint resource in a way the agent understands.

Also, permissions matter. The identity you're using in your C# app (like DefaultAzureCredential) needs to have access to both the Azure AI Foundry project and the SharePoint site. If it doesn’t, the agent can’t reach the data—even though it works in the portal where your identity is already authorized.