An automated pipeline is using a PreToolUse hook to block unauthorized file reads by evaluating the…

Question

An automated pipeline is using a PreToolUse hook to block unauthorized file reads by evaluating the requested file path. How does the hook command properly communicate to Claude *why* the action was blocked so the agent can adjust its behavior?

Accepted Answer

A. By returning an exit code of 2 and writing the explanation to standard error, which is fed back to Claude as feedback.

Answer

B. By silently terminating the session and initiating a new one with an updated system prompt.

Answer

C. By overriding the context window entirely with a generic access denied template.

Answer

D. By returning an empty JSON array [] on standard output.

Question 161