Deliver a text message from you ("agent") to another coding agent's inbox, for example to hand off a task, ask a question or report a result. Call mail_peers first if you are unsure of the recipient name. To answer a message you received from mail_check, pass its id as reply_to. Each call writes one new message and never edits or removes existing mail. If the recipient has not started yet, the message waits in its inbox. Returns "sent to "; keep the id if you expect a reply that references it.

Fetch the unread messages addressed to you ("agent"), oldest first. Use it when you expect a reply or want to see if another agent wrote to you. Reading consumes the messages: each one is moved to your read folder and is not returned again, so act on or note what you need. With wait_seconds above 0 the call blocks until at least one message arrives or the time runs out. Returns each message as "[] from (re ) at :" followed by its body, or "no new messages". When live push is installed, new mail may already appear in your session without calling this tool.

List every agent name that has a mailbox here, so you know valid recipients for mail_send. Read-only: it changes nothing. Returns one line per agent: " - last started ", or "never started" for an agent that has mail waiting but has not run yet. Your own name is marked "(you)". A recent start time suggests the agent is active, but it does not guarantee a session is open right now.