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 v2.1.239 Home All releases olderv2.1.238 v2.1.240newer
Claude Code v2.1.239

Reading someone else's artifact asks you once, then remembers for the conversation

You'll notice
Useful3 Signal2
Artifacts

Reading someone else's published page now asks you once, then remembers for the rest of the conversation.

What

Reading a published page now runs through its own permission branch instead of borrowing WebFetch's. Your own artifacts are read without a prompt; the first read of someone else's asks you, and that approval is remembered for the rest of the conversation.

Details
  • A URL that is not a recognisable artifact link is rejected outright, with text telling the model to use a URL from the list or publish result.
  • Deny and ask rules written for Artifact or WebFetch are both consulted before the read runs.
  • In plan mode, reading another person's artifact is refused rather than prompting, since no one can answer.
  • The automatic permission classifier is never allowed to approve one of these reads on your behalf.
Evidence

This is not an artifact url Claude can read. Use the artifact url from the list or publish result.

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 →