Source Intelligence

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.

All of v2.1.248 Home All releases olderv2.1.247 v2.1.250newer
Claude Code v2.1.248

Remote tool announcements abort when echoed back unverified

You'll notice
Useful2 Signal3
Remote Tools

Remote tool announcements abort if echoed back without a verified device attestation.

Feature flag
tengu_violin_wood Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.248: on

Read once, for one account on one subscription tier, against v2.1.248. It isn't a statement about your account. What a flag value here can and cannot tell you

What

The remote-tools announcement now cancels itself and reports unverified_sender if it sees its own request echoed back with an unverified device attestation, instead of proceeding.

Details
  • The client also renews the device proof in that case.
  • The announcement acknowledgement schema gained passthrough_declined (either "policy" or "pending") and passthrough_adopted.
  • Error handling now separates retryable conditions (remote_tools_not_ready:, stale_worker_epoch) from outright refusals (remote_tools_disabled:, invalid_announce:).
  • The whole remote-tools surface is gated by tengu_violin_wood, which falls back to off; the abort itself is unconditional inside that path.
Evidence

unverified_sender

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 →