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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 v2.1.232

MCP connections record how they negotiated, and treat a probe timeout as a fallback

You'll notice
Useful4 Signal3
MCP

An MCP probe that times out is treated as a fallback rather than a failed connection.

What

MCP connect success and failure events now record which negotiation mode was used and whether the connection had to fall back after probing. In automatic negotiation mode, a request timeout during the Anthropic-side probe is now treated as a fallback case instead of a hard connection failure.

Evidence

_anthropicProbeTimedOut

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.232 →