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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.268 ·

Resumed in-process teammates can show a definition-change notice

When an in-process teammate is resumed, Claude Code can now tell you its agent definition has changed

TierUnder the hoodhow much it should matter to you
Useful1my rating, 1 to 5
Signal1worth watching, 1 to 5
AreaTeammateswhat it touches
KindInternal Changesin v2.1.268,
Group of 3 Under the hood No documentation found

When an in-process teammate is resumed, Claude Code can now tell you its agent definition has changed

What

  • resumeInProcessTeammate's return value gained a definitionNotice field, threaded through from a new parameter at the call site, alongside the existing agentId/taskId/resumedMessageCount.
  • When a not-running teammate (subagent) is resumed in-process, the success message shown now appends this definitionNotice text (as a space-prefixed suffix) if present, in addition to the existing text about prior messages or a missing transcript.

Why This surfaces a warning when a teammate's underlying agent definition has changed since it last ran, so resuming it doesn't silently continue under stale assumptions about what the agent does.

Read from
Names in the bundledefinitionNotice
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 conditions produce a definitionNotice, or what text it contains, is not stated.

See this entry in the whole of v2.1.268 →

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