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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.222

Active MCP server/tool markers are cleared on conversation reset

You'll notice
Useful3 Signal0
MCP

Errors after a conversation reset are no longer mislabelled with the MCP server and tool from a previous turn.

What

Stale MCP attribution no longer survives a conversation reset, so a later error or event is not tagged with the server and tool from a previous turn.

Details
  • The query loop's tool-state object gained an onReset hook
  • The hook calls a new helper that clears activeMcpServer and activeMcpTool on the options object, guarded by try/catch
  • The same helper is also invoked at the start of the API loop
Evidence

activeMcpServer

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.222 →