Source Intelligence

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.

All of v2.1.251 Home All releases olderv2.1.250
Claude Code v2.1.251

Connector names accept far more characters

You'll notice
Useful3 Signal2
MCP

Connector names now allow almost any characters, with new checks against host-prefix and id-like names.

What

The name you give a connector in a manifest is no longer restricted to letters, digits, spaces and a few punctuation marks. Any 1 to 64 characters are allowed except control characters, line breaks, unusual spaces and text-direction marks, and the name cannot start or end with a space or invisible character. A new check also rejects names that read like a host: prefix or like an internal id.

Details
  • Names shaped like the internal claude_ai_ or mcp__ prefixes are rejected too.
  • The change swaps an allow-list for a deny-list, so accented and non-Latin names now pass.
Evidence

`must not read as \host:\ or be shaped like an id or a \claude_ai_\u2026\/\mcp__\u2026\ prefix`

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

See this entry in the whole of v2.1.251 →