Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
CompactionArea: what it touches
Internal ChangesKind: in v2.1.323,
Internal ChangesSection of the release
What
When a conversation grows too long, Claude Code compacts it, which means summarising earlier parts to free up space. The prompt used for that step carries its own copy of the ToolSearch description. ToolSearch is how Claude looks up tools that are held back until needed. That copy was reworded in this release.
It still says that once a tool's definition appears in a search result, Claude can use it exactly like any other tool.
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
