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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 v2.1.248 27 Aug 2026

MCP authentication tools are flagged as stubs

You'll notice

Useful2 Signal2

MCP

MCP auth tools are marked as stubs and confirm with the tools actually available.

What

The per-server complete_authentication tool generated for MCP servers is now tagged isAuthStub in its metadata, so callers can tell it apart from the server's real tools. On success it now builds its confirmation message from the server name plus the tools actually available, instead of the old fixed line claiming the server's tools should now be available.

Evidence

isAuthStub

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

See this entry in the whole of v2.1.248 →