Message your other Claude Code sessions changedcross-session-messaging
Nearest release: v2.1.287, published 11 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 2 Oct 2026 04:13 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 2 Oct 2026 04:37 UTC.
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6161* The message is [over the size cap](#limitations). Claude Code refuses it in the sending session, before it leaves.
6262* A rapid burst to a session on this machine has reached [what that session's inbox accepts](#limitations). Claude Code refuses further messages to that session.
63* A session beyond this machine is [listed as unable to receive cross-session messages](#message-sessions-on-other-machines). Claude Code refuses the message in the sending session, before it leaves this machine.
6364* The reply target on this machine fails a safety check, such as a symlinked target. [Refusing to send a cross-session message](/docs/en/errors#refusing-to-send-a-cross-session-message) lists these checks.
6465
6566The receiving session checks each arriving message against its own [inbound controls](#control-inbound-messages), and the check ends in one of three outcomes:
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139140Starting a conversation with a session on another of your machines requires Claude Code v2.1.225 or later and a target that [appears in the listing](#see-which-sessions-claude-can-reach).
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141You can message a session shown as `offline` in [the listing](#see-which-sessions-claude-can-reach), one whose Remote Control connection has dropped. The send goes through, but the message arrives only after that session's machine reconnects.
142A session's row in [the listing](#see-which-sessions-claude-can-reach) can show a condition that changes what happens when Claude messages that session:
142143
144* **`offline`**: that session's Remote Control connection has dropped. The message goes through, but arrives only after that session's machine reconnects.
145* **`can't receive cross-session messages (off in that session)`**: messaging [isn't available](#availability) in that session, or its [`crossSessionInbound`](/docs/en/settings-reference#crosssessioninbound) value is `refuse`. Claude Code refuses a message to that session before the message leaves this machine. The result under Claude's `SendMessage` call begins `Not sent` and names the reason. Once the cause is fixed in that session, a later listing no longer shows this condition, and Claude can message that session.
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143147A session inside a container and a session on the host can't reach each other. Two sessions inside the same container can still message each other, including on a [self-hosted runner](/docs/en/self-hosted-environments). A session inside WSL 2 and a native Windows session on the same computer can't reach each other either.
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145149If this session isn't connected to Remote Control when Claude sends to a session beyond this machine, the message still goes through, but without a [reply address](#what-a-message-looks-like), so the receiving Claude can't answer it.
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309313 * **Cloud session missing**: a cloud session appears only while this session is connected to [Remote Control](/docs/en/remote-control).
310314 * **Other-machine session missing**: a session on another of your machines appears only when it runs with [Remote Control](/docs/en/remote-control) and this session is connected as well.
311315 * **Other-machine session `offline`**: a message to a session listed as `offline` goes through, but [arrives only after that session's machine reconnects](#message-sessions-on-other-machines).
316 * **Cloud or other-machine session `can't receive cross-session messages`**: a message to a session listed with this condition [doesn't leave this machine](#message-sessions-on-other-machines), and the result under `SendMessage` begins `Not sent`.
312317 * **Older cloud or other-machine session missing**: Claude Code reads those session lists newest first and stops after a bounded number of pages, so Claude can't message a session that fell past them by name.
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314319In a session with messaging, `/status` also shows a `Peer address` row with the session's own inbox address, or `unavailable` and the reason when Claude Code [couldn't set up an inbox](#the-sessions-inbox-socket).
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