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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 v2.1.221 Home All releases ←olderv2.1.220 v2.1.222newer→

Claude Code v2.1.221 3 Aug 2026

MCP slash-command prompts extracted, now abortable

You'll notice

Useful3 Signal0

MCP

You can now cancel a running MCP prompt slash command without seeing a bogus error message.

What

Running an MCP prompt as a slash command can now be aborted cleanly, and aborting no longer looks like a failure.

Details

The prompt-command construction moved into its own function.
Fetching the prompt passes the command's abort signal and a context label to the client connection.
An aborted prompt no longer logs mcp_get_prompt_failed and no longer surfaces an "Error running command" notice; it rethrows.

Evidence

context: "MCP prompt command"

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

See this entry in the whole of v2.1.221 →