AI Engineer · October 11, 2026

Agent tool limits: distinguish blocking a call from stopping the run

video Agent Security AI Engineering Model Evaluation

Agent tool limits: distinguish blocking a call from stopping the run video thumbnail

Why it matters

This Strands workshop adds tool-call limits and workflow checks to a small customer-service agent before deployment. Current SDK documentation distinguishes cancelling one tool call, cancelling a batch, and ending the agent loop. These are different controls: returning an error for a blocked tool can still leave the model running. Skills and prompts describe the intended workflow; hooks supply code-level intervention points.

My takeaway: Test a low tool limit, repeated retries, parallel calls, and a new user turn. Decide whether the limit applies per invocation, session, or user, and verify its reset behavior. Use an explicit termination control when the requirement is to stop the run.

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