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 v2.1.227 Home All releases olderv2.1.226 v2.1.228newer
Claude Code v2.1.227

Durable artifact watches backed by server-side webhooks

Not switched on
Useful3 Signal5
Artifacts Notable

Artifacts could keep being watched even when your session is not running, but that is off.

Server-side webhook-backed durable artifact watches are fully built behind a flag that is off in this build.

Feature flag
tengu_scalable_quiche 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 v2.1.227: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.227. It isn't a statement about your account. What a flag value here can and cannot tell you

What

New machinery keeps watching a published artifact even when the session is not live, by minting a webhook through a dedicated wake service (watch_url and unwatch_url tools) and subscribing to the artifact's publish events. Unsubscribing releases both the subscription and the webhook. It requires a first-party client and the flag tengu_scalable_quiche, which is off in this build.

Details
  • the returned https URL is checked against the expected webhook path shape before being used
  • outcomes are reported as artifact_durable_subscribe with reasons including trigger_limit, mint_failed, no_wake_minter and client_policy
Evidence

artifact_durable_subscribe

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 v2.1.227 →