command.describe
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.
Plugins can now register, run, list and describe their own slash commands via a new command API
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.265.
In the changelogs
14Releases whose published page names command.describe.
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v2.1.317
Two internal name lists in Claude Code each gain an entry
A list holding command.describe, env.get and prompt.section now also holds tool.describe, and a list of input sources gains a mid-turn prompt entry
found in this entry's text
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v2.1.312
Remote clients can ask to start a shell task, and a hooks list grows
A new request lets a connected program start a shell task, and a list in the hooks runtime now holds five event names instead of two
found in this entry's text
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v2.1.311
Hooks runtime skips needless work, with two variables to turn this off
The hooks runtime now skips work when only default handlers apply; two environment variables switch the shortcuts off
found in this entry's text
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v2.1.311
Plugin command description handling reorganised
Claude Code reorganised how it handles the
command.describeplugin event, with no visible change in behaviourfound in this entry's text
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v2.1.292
Plugins gain a prompt autocomplete hook event
A new plugin event,
prompt.autocomplete, is defined to let a plugin suggest completions while you type, though nothing raises it yetfound in this entry's text
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v2.1.267
Hooks engine gains session.compact, session.receive, ui.resolve event contracts
The plugin hooks system adds validated event types for session compaction, session receive, and UI resolution
found in this entry's text
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v2.1.265
Plugin commands can now be registered/run/described via new $.command.* hook API
Plugins can now register, run, list and describe their own slash commands via a new command API
found in this entry's text
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v2.1.265
Command execution can now be intercepted by command.run/command.describe hooks
Slash-command execution can now be intercepted and rewritten by command.run/command.describe hooks
found in this entry's text, named in this entry
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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
Plugin runtime API gains command hooks and UI window controls
Plugins can now register and run their own commands and open or close their own UI windows
found in this entry's text
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v2.1.265
Plugin telemetry site map gains command.run and command.describe hooks
Plugin hook telemetry adds command.run and command.describe event types
found in this entry's text
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v2.1.265
ui.invalidate now supports invalidating command.describe
The ui.invalidate plugin operation can now also invalidate command.describe
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
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v2.1.265
Hook registry gains command.describe as a core hook event
Claude Code adds a new internal hook event called command.describe
found in this entry's text, named in this entry
First cited
3The earliest release whose published evidence quoted command.describe 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.