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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 legacy fallback records which probe failure caused it

Under the hood

Useful2 Signal2

MCP

When an MCP server falls back to the older transport, the exact reason is now recorded.

What

When probing an MCP server falls back to the legacy transport, the reason is now recorded distinctly as an id mismatch, a malformed response or a premature stream end, rather than one undifferentiated legacy fallback.

Evidence

_anthropicProbeLegacyEvidence

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 →