Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ToolsArea: what it touches
Internal ChangesKind: in v2.1.290,
Internal ChangesSection of the release
Unclear It is not clear what the extra step changes in a description.
What
Descriptions of Claude Code's own tools, but not tools from MCP add-on servers, now pass through an extra step that depends on where the request comes from, before any description hooks run.
Why
The tool descriptions sent to the model may differ from before.
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtIt is not clear what the extra step changes in a description.
