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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

Session-ID header name shared between call sites

Under the hood
Useful1 Signal0
Internals

The session header name comes from one constant now; the wire is unchanged.

What

The per-request session header is now emitted from a single constant instead of an inline string. The name sent on the wire is unchanged.

Evidence

X-Claude-Code-Session-Id

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 →