DA + action from spec will write data endlessly

[HuihuiWu-Microsoft]

Describe the bug
Reported from Diego Riera:

Agent toolkit have a bug, when I select to create an action and use GET /user from graph it starts to download sample an keep on it until disk become full

To Reproduce
Steps to reproduce the behavior:
Steps to reproduce the behavior:

1. Go to 'Create a new agent/app'
2. Click on 'Declarative Agent'
3. Click on 'Add an Action'
4. Click on 'Start with an OpenAPI Description Document'
5. Click on 'Enter OpenAPI Description...'
6. Paste URL "https://aka.ms/graph/v1.0/openapi.yaml"
7. Select GET /Users
8. It will download sample until disk is full

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

VS Code Extension Information (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

CLI Information (please complete the following information):

• OS: [e.g. iOS8.1]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[m365-agent-toolkit-assistant]

👋 Hi @HuihuiWu-Microsoft,

Thank you for reporting this issue! We want to let you know that:

⏱️ Our team will personally review your issue
🎯 You can expect a response within 2 business days

✨ This is an AI-generated initial response
🤖 AI-Generated Preliminary Analysis:

Classification: Bug — ATK appears to loop while generating an action from the full Microsoft Graph OpenAPI document, which is inconsistent with expected “add action” behavior.

• Repro is specific and points to https://aka.ms/graph/v1.0/openapi.yaml + GET /users.
• Learn guidance says Graph’s OpenAPI is huge and Kiota generation should be scoped with --include-path/--exclude-path to reduce size, which is consistent with this failure mode.
• ATK docs also say OpenAPI-based plugin generation should use an existing REST API spec and follow OpenAPI guidance; no doc suggests endless downloading is expected.
• I didn’t find a separate matching duplicate in the searched repo.

Upgrade check: No changelog entry found for this exact issue in packages/vscode-extension/CHANGELOG.md (unverified fixed version).

What to do now:

1. Avoid the full Graph spec URL as-is; use a trimmed/scoped OpenAPI document for only the needed path(s).
2. Try a smaller/custom spec for /users instead of the entire Graph description.
3. Share ATK extension version + OS to help confirm whether this is already fixed in prerelease.

Useful links:

• No similar issues found in the searched repos.
• https://learn.microsoft.com/graph/sdks/generate-with-kiota#generating-a-client
• https://learn.microsoft.com/microsoft-365/copilot/extensibility/build-api-plugins-existing-api
• https://learn.microsoft.com/microsoft-365/copilot/extensibility/openapi-document-guidance

If you want, I can help create a minimal /users OpenAPI file as a workaround.

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Note: This is an automated first response generated by AI. A human team member will review your issue and provide a more detailed response soon. We appreciate your patience!