Sweep 19 Sep 2026 · 02:36Z Build v2.1.278 500 read Stable v2.1.267 Latest v2.1.278 Next v2.1.278 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.269 ·

Artifact and skill prompts gain 'Live files' and 'Live room' sections

The artifact and skill system prompts now include Live files (and, when enabled, Live room) sections describing this session's shared state

TierYou'll noticehow much it should matter to you
Useful3my rating, 1 to 5
Signal2worth watching, 1 to 5
AreaArtifactswhat it touches
KindImprovementsin v2.1.269,
Group of 2 You'll notice

The artifact and skill system prompts now include Live files (and, when enabled, Live room) sections describing this session's shared state

What

  • A new helper builds extra markdown sections appended to the Artifact/skill system prompt: a "Live files — this session" block, and, when room mode is on and the capability roster includes "room", a "Live room — this session" block.
  • These sections are now appended both to the skill-authoring prompt and to the top-level artifact prompt builder.
  • The function that renders a skill's capability roster now always appends these Live files/Live room sections, including on error or empty-roster paths.

Why This gives the model explicit, up-to-date context about files and rooms that are live/shared during the session, wherever an artifact or skill prompt is built.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhat the "Live room" feature is and how a session gets access to it is not established by the evidence.

See this entry in the whole of v2.1.269 →