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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.248

PostToolUse hooks receive how long the tool took

Use it now
Useful4 Signal3
Hooks Notable

PostToolUse hooks now get duration_ms, the tool's own run time excluding prompts and hooks.

duration_ms
What

The data passed to a PostToolUse hook now includes an optional duration_ms, the tool's own execution time. It excludes time spent on permission prompts and on other hooks, so it reflects the tool rather than the wait around it.

Evidence

Tool execution time in milliseconds. Excludes permission-prompt and hook time.

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.248 →