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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 v2.1.75 Home All releases olderv2.1.74 v2.1.76newer
Claude Code v2.1.75

Agent Message Queuing to Running Agents

What

When resuming a running agent via Agent({resume: id}), the prompt is now queued for delivery instead of throwing an error. Coordinators can also send messages to running agents via SendMessage.

Details
  • If an agent is already running, calling Agent({resume: id}) queues the prompt and returns a queued_to_running status
  • The agent receives the queued message at its next tool-round boundary
  • SendMessage({to: "<name>", message: "..."}) can also queue messages to running local agents
  • A coordinator message is rendered with: "The coordinator sent a message while you were working: [...] Address this before completing your current task."
Evidence

Agent message queue system (search for "queued_to_running", "Message queued for delivery", "pendingMessages")

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

See this entry in the whole of v2.1.75 →