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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 v2.1.221 3 Aug 2026

Completed MCP OAuth is discarded if identity changed or the server was disabled

You'll notice

Useful3 Signal0

MCP

A finished MCP login is now thrown away if you switched accounts or the server got disabled meanwhile.

What

A finished OAuth flow is now re-validated before its connection is kept, so a flow that outlived its preconditions cannot produce a live connection.

Details

Account identity is re-checked both before and after the reconnect.
The server is re-checked against disabled state and managed policy after completion.
Stale or now-forbidden results are dropped, with distinct debug messages per case.

Evidence

OAuth completed but the server is now disabled or policy-blocked; not reconnecting

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

See this entry in the whole of v2.1.221 →