PostToolBatch
A Claude Code hook event, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
After a full batch of parallel tool calls resolves, before the next model call
Anthropic's own wording. Read off Hooks reference, captured 2026-10-22.
In the changelogs
3Releases whose published page names PostToolBatch.
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v2.1.287
Hook matching covers PostToolBatch, and repeated refusal log entries are capped
The matcher used for
PostToolUsehooks now also coversPostToolBatch, and refused-request log entries are recorded once per dayfound in this entry's text, named in this entry
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v2.1.248
Hook schema failures now print the exact field, a template, and which tool failed
A bad hook response now shows the exact failing field, the output and a template.
found in this entry's text
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v2.1.118
PostToolBatch Hook Event
found in this entry's text
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the hook event does. All hook events.