Under the hood
No documentation found
Claude Code adds a new internal hook event called command.describe
What
Claude Code's internal hook system (the machinery that lets different parts of the app react to events) now includes a new core event named command.describe, alongside existing ones like agent.offer, tool.describe, session.start, and the turn.start/turn.step/turn.complete events.
Why
This is internal plumbing rather than something a reader interacts with directly. It suggests Claude Code now has a defined point for describing commands, similar to how it already describes tools, but the finding doesn't say what consumes this event yet.
Names in the bundlecommand.describe
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The writer flagged doubt
What functionality actually uses the new command.describe hook is not established by this finding.