Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
MCPArea: what it touches
New FeaturesKind: in v2.1.248,
New FeaturesSection of the release
What
The reminder Claude Code inserts about tools that are no longer usable was split apart. Tools lost because an MCP server disconnected get one wording; tools whose definitions were loaded earlier and then removed for any other reason get their own note telling the model to disregard those descriptions. Re-added tools are split the same way.
Details
Previously all vanished tools shared one MCP-flavoured message, which read as wrong when the cause was not a disconnect.
Evidence
Definitions of the following tools were loaded earlier in this conversation and their source has since been removed.
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
