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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 v2.1.246 25 Aug 2026

Cancelling a call no longer counts as an MCP failure

You'll notice

Useful2 Signal1

MCP

Cancelling a tool call is no longer recorded as an MCP server failure.

What

The mcp_session_recovery retry-failure event is skipped when the call was aborted, so cancelling stops being recorded as an MCP server retry failure.

Evidence

retry_failed_other

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

See this entry in the whole of v2.1.246 →