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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

Credential-helper tokens suppress the MCP OAuth flow

You'll notice
Useful3 Signal2
MCP

An MCP headersHelper that mints an Authorization header now suppresses the OAuth flow.

headersHelper
What

If an MCP server's headersHelper command mints an Authorization header, Claude Code no longer layers an OAuth flow or first-party auto-auth on top of it, matching what it already did for a statically configured Authorization header.

Details
  • Resolved headers are now computed once up-front for sse, http and ws servers, before any transport is built, and checked for an Authorization key.
  • Driven entirely by the headersHelper config key, which the sse, http and ws server schemas accept. No feature flag.
Evidence

headersHelper

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 v2.1.248 →