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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 v2.1.267 ·

New session-identity contest/impersonation warnings for send_message

send_message now warns about possible impersonation or a restarted session before sending

TierYou'll noticehow much it should matter to you
Useful2my rating, 1 to 5
Signal2worth watching, 1 to 5
AreaRemote Controlwhat it touches
KindImprovementsin v2.1.267,
You'll notice

send_message now warns about possible impersonation or a restarted session before sending

What

Two new warnings appear when resolving a saved session reference for send_message:

  • another live session on the same machine currently claims the same identity as the target, which could mean impersonation or a duplicate open conversation
  • the target session has restarted since it was last reached (same session, but a new process)

Both warnings advise checking with the user before sending anything sensitive.

Why

These guard against sending a message to the wrong session when identities have become ambiguous, such as after a restart or when two sessions could plausibly claim the same identity, prompting extra caution before sharing sensitive content.

See this entry in the whole of v2.1.267 →

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