Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
SDKArea: what it touches
Internal ChangesKind: in v2.1.323,
Internal ChangesSection of the release
What
ToolSearch is how Claude looks up tools that are held back and listed only by name until needed. One copy of its description appears in a prompt Claude Code sends when it is run through its SDK, its programming interface. That copy was reworded in this release.
It still says that until a tool is fetched, only its name is known, so Claude cannot use it yet.
Why
Changing Claude's instructions can change how it behaves. Here the instruction keeps the same meaning.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeImproved ToolSearch to say when a tool Claude searched for by its short name is already available, instead of only reporting no match
