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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.

← All of v2.1.251 Home All releases ←olderv2.1.250
Claude Code v2.1.251

Ultraplan hands the agent a note it is told not to answer

Under the hood
Useful2 Signal3
Plan Mode

Ultraplan hands the agent a status note about your plan and tells it not to reply.

What

Exiting plan mode via the ultraplan option now passes a note channel to the launched work, which posts a status message about what happened to the plan plus a follow-up instruction: "The ultraplan note above reports what happened to the plan. Do not respond to it - wait for the user's next message."

Details
  • The ultraplan option appears only when remote sessions are permitted by the allow_remote_sessions setting, an internal availability check passes, and a live remote session handle exists.
Evidence

The ultraplan note above reports what happened to the plan. Do not respond to it — wait for the user’s next message.

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.251 →