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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 retries now cover auth rejections

You'll notice

Useful3 Signal2

MCP

MCP now retries auth rejections, including rejected credential-helper tokens.

What

MCP error handling has an explicit set of codes it treats as retryable, combining HTTP 5xx, the existing connection error codes, and auth-rejection codes such as helper-minted credential rejections.

Details

The MCP error classes moved out of a lazily loaded wrapper into plain top-level classes.
Applies unconditionally, with no flag.

Evidence

HEADERS_HELPER_AUTH_REJECTED

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 →