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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 v2.1.239 21 Aug 2026

SDK protocol accepts relayed Claude Code Projects notifications

Under the hood

Useful2 Signal5

SDK

The SDK now accepts a relayed notification kind for Claude Code Projects coordinator sessions.

What

Task notifications delivered over the SDK protocol accept a third kind, projects-relay, for deliveries composed by Anthropic servers for a Claude Code Projects coordinator session and addressed to a thread session. A delivery carrying the relay stamps is framed as a message from the coordinator session; one without them keeps the generic background-notification framing.

Details

Relay message ids must match the cmsg_ id format, and relay rows are validated against those ids.
No gate is visible in the schema.

Evidence

projects-relay

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

See this entry in the whole of v2.1.239 →