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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

MCP connection-failure telemetry records where the auth header came from

Under the hood
Useful2 Signal2
MCP

MCP connection failure reports now note when auth headers came from a credential helper.

What

Failure reports for sse, http and claudeai-proxy MCP transports now carry a field marking headers minted by a credential helper, alongside the existing user-header and CLI-bearer flags. It feeds the same classifier behind tengu_mcp_server_connection_failed. Unconditional.

Evidence

helperMintsAuthHeader

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 →