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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 v2.1.223

MCP control tool gives a session-specific message when controls are unavailable

You'll notice
Useful2 Signal0
MCP

The MCP tool now says controls are unavailable in this session rather than blaming startup.

What

The MCP control tool distinguishes between a terminal that is still starting up and a session where the controls simply do not exist.

Details
  • When reconnect, enable and disable handles are missing in a non-interactive or remote session, it now returns "Reconnect, enable, and disable aren't available in this session."
  • Otherwise it keeps the previous text about the terminal still starting up or showing another view.
Evidence

Reconnect, enable, and disable aren't available in this session.

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

See this entry in the whole of v2.1.223 →