classic.PreToolUse
A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Hook event names now support wildcard and negation patterns, and internal plugin hooks are namespaced as classic.<EventName>
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.265.
In the changelogs
3Releases whose published page names classic.PreToolUse.
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v2.1.265
Hook event names gain a wildcard/negation pattern grammar and a 'classic.' namespace
Hook event names now support wildcard and negation patterns, and internal plugin hooks are namespaced as
classic.<EventName>found in this entry's text
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v2.1.265
Functionhooks event registry expands: ui.open/ui.close, command.run/command.describe, classic.PreToolUse
Hooks system adds ui.open/ui.close and command.run/command.describe event types, and renames PreToolUse internally
found in this entry's text, named in this entry
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v2.1.265
Hook events: PreToolUse split into classic vs. new, and two new synchronous hook events added
PreToolUse hooks are now split into a classic and new form, plus two new synchronous hook events
found in this entry's text, named in this entry
First cited
1The earliest release whose published evidence quoted classic.PreToolUse was v2.1.265, 8 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
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 settings key does. All settings keys.