feat(sdk): add extension for user approval

[pilartomas]

Signed-off-by: Tomas Pilar [email protected]

Summary

Linked Issues

closes #1762

Documentation

• No Docs Needed:

If this PR adds new feature or changes existing. Make sure documentation is adjusted accordingly. If the docs is not needed, please explain why.

[gemini-code-assist]

Summary of Changes

Hello @pilartomas, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the AgentStack SDK by integrating a dedicated Approval extension. This new feature allows agents to formally request user approval for critical actions, providing a clear human-in-the-loop mechanism. It introduces structured data models for approval requests and responses, along with server and client-side logic to manage these interactions. Concurrently, it deprecates the older ToolCallRequest and ToolCallExtensionServer, streamlining the approach to agent-user interactions within the SDK.

Highlights

• New Approval Extension: Introduced a new Approval extension within the agentstack-sdk-py to facilitate explicit user approval workflows for agent actions.
• Structured Approval Models: Added ApprovalRequest and ApprovalResponse Pydantic models to define the structure for requesting and handling user approvals, including a mechanism to raise an error on rejection.
• Server and Client Implementations: Provided ApprovalExtensionServer and ApprovalExtensionClient classes to manage the lifecycle of approval requests and responses, integrating with the SDK's message and context handling.
• Deprecation of ToolCall: Marked ToolCallRequest and ToolCallExtensionServer as deprecated, guiding users to transition to the new ApprovalRequest and ApprovalExtensionServer for future interactions.

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[gemini-code-assist]

Code Review

This pull request introduces a new generic user approval extension, which is a great addition for interactive agent workflows. It also deprecates the older, more specific ToolCallRequest and ToolCallExtensionServer in favor of this new mechanism. The implementation of the new approval extension is well-structured. I've added a few suggestions to improve code clarity and maintainability.