Message your other Claude Code sessions changedcross-session-messaging
Nearest release: v2.1.284, published 21 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 29 Sep 2026 14:37 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 29 Sep 2026 15:07 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* The reply target on this machine fails a safety check, such as a symlinked target or an endpoint that isn't the expected process. [Refusing to send a cross-session message](/docs/en/errors#refusing-to-send-a-cross-session-message) lists these checks.
63* 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.
6464
6565The 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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