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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 v2.1.229

MCP OAuth no longer re-saves a stale client secret or redirect URI

You'll notice
Useful2 Signal2
MCP not in their notes

MCP sign-in no longer saves a stale client secret or redirect address back to disk.

oauth.clientId
What

Saving OAuth client details for an MCP server now drops the client secret when the issuer is known, the client id matches the one already stored with no secret against it, and it matches the configured oauth.clientId. A previously stored redirect URI is only reused when this client is not doing the redirect itself, instead of falling back to the current one.

Details
  • Prevents a secret from a different registration being written back over a secretless entry.
Evidence

mcpOAuth

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.229 →