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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.

← All of v2.1.251 Home All releases ←olderv2.1.250

Claude Code v2.1.251 28 Aug 2026

Cancelling an orphaned MCP task no longer hangs

You'll notice

Useful3 Signal2

MCP

Cancelling leftover work after an MCP server dies now times out instead of hanging.

What

After an MCP server process is killed, the request that cancels its leftover task now carries a timeout instead of running unbounded.

Details

Applied on every cancel through this path.

Evidence

cancelTask(c, { signal: AbortSignal.timeout(oce) }), AbortSignal.timeout(oce)

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

See this entry in the whole of v2.1.251 →