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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.

All of v2.1.163 Home All releases olderv2.1.140 v2.1.165newer

Stop Hook Output Schema with additionalContext

What

The Stop hook event now has a formal output schema with an additionalContext field, allowing hooks to send feedback to the model after it finishes a response so the conversation continues.

Details
  • Hook output schema: { hookEventName: "Stop", additionalContext?: string }
  • additionalContext is non-error feedback delivered to the model; the conversation continues so the model can act on it
  • Previously, the Stop hook output schema was not separately defined — it now matches the SubagentStop pattern
Evidence

Schema description (search for "Hook-specific output for the Stop event. additionalContext is non-error feedback")

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

See this entry in the whole of v2.1.163 →