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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 v2.1.118

PostToolBatch Hook Event

What

A new hook event type that fires once after every tool call in a batch has resolved, before the next model request.

Details
  • Unlike PostToolUse which fires per-tool and may run concurrently for parallel tool calls, PostToolBatch fires exactly once with the full batch
  • Hook input includes tool_calls array with {tool_name, tool_input, tool_use_id, tool_response} for each call
  • Supports additionalContext return to inject content into the next model request
  • Can return "stopAgent": true to halt execution, showing "Execution stopped by PostToolBatch hook"
  • Available in hooks configuration under the event name "PostToolBatch"
Evidence

Schema definition (search for "PostToolBatch") at line ~263664. Hook input schema describes "Fired once after every tool call in a batch has resolved, before the next model request".

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

See this entry in the whole of v2.1.118 →