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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 13 Aug 2026

MCP servers that garble the version probe now fall back to the legacy protocol

You'll notice

Useful3 Signal1

MCP

Garbled MCP version-probe replies now fall back to legacy rather than erroring the connection.

What

When Claude Code probes an MCP server for its protocol version, a reply with a mismatched id, unparseable content, or a stream that ends early is now handled as a legacy server and the connection proceeds, instead of surfacing an error.

Evidence

Connection closed during the version negotiation probe

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

See this entry in the whole of v2.1.232 →