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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 v2.1.247 26 Aug 2026

MCP server protocol field is validated

Under the hood

Useful1 Signal1

MCP

Stored MCP server records now reject odd characters in the protocol field.

What

The stored MCP server record's protocol field is now restricted to printable ASCII with the same length cap as its neighbouring fields, instead of accepting any string.

Evidence

/^[\x20-\x7e]+$/

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

See this entry in the whole of v2.1.247 →