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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 v2.1.251

Follow-ups delivered straight to a running artifact editor

Not switched on
Useful3 Signal4
Artifacts Notable not in their notes

Follow-ups can go straight to a working artifact editor if you set an environment variable.

Direct editor delivery requires an env var plus a relayed human conversation, otherwise skipped.

CLAUDE_CODE_EDITOR_CODELIVERY
What

A follow-up message on a thread can be handed directly to an artifact editor sub-agent that is still working, instead of going back through the coordinator first. It requires the environment variable CLAUDE_CODE_EDITOR_CODELIVERY to be set to a truthy value and the session to be a relayed human conversation; otherwise the path is skipped entirely.

Details
  • Matching relies on the editor's acknowledgement carrying a follow-up URL, checked against the coordinator's record of which editors are live.
  • Carries messages for the races this opens up: the worker dying mid-flight, the page being deleted, the page being republished by someone else, and the follow-up being withdrawn or cancelled.
Usage
CLAUDE_CODE_EDITOR_CODELIVERY=1 claude
Evidence

artifact_editor_codelivery

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

See this entry in the whole of v2.1.251 →