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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 enable/disable failures report the underlying error

You'll notice

Useful3 Signal0

MCP

Turning an MCP server on or off now shows the real error instead of a vague message.

/mcp

What

Failing to toggle an MCP server now shows the actual error instead of a generic "it may have been removed" message.

Details

Applies to both the /mcp slash-command path and the plugin/MCP toggle UI.
Toggling a server from the manager surfaces the error inline rather than discarding it.
The failure text is assembled at runtime from the action, the server name and the error.

Evidence

Failed to

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 →