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Sweep 08 Oct 2026 · 18:53Z Build v2.1.295 516 read Stable v2.1.286 Latest v2.1.295 Next v2.1.295 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 8 Oct 2026
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Use the mods API changedplugins/mods/api

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Upstream edited this page at 8 Oct 2026 23:01 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 8 Oct 2026 23:07 UTC.

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138138## Send and receive messages between sessions
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140A mod can send a plain-text message to another of your sessions or to one of this session's subagents, and observe the messages that arrive and leave. `$.session.send({ to, text })` sends one, the same delivery the SendMessage tool makes. `to` is `{ sessionId }` for a session, `{ agentId }` for a subagent from `$.agent.list()`, or the string address a received message came from. The call resolves once the message is queued, with `{ isDelivered: true }`. When nothing was delivered it resolves with `{ isDelivered: false, reason }`, and `reason` says why.
140A mod can send a plain-text message to another of your sessions, to one of this session's subagents, or to a teammate in its [agent team](/docs/en/agent-teams). It can also observe the messages that arrive and leave.
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142To send one, call `$.session.send({ to, text })`, which makes the same delivery the SendMessage tool makes. Set `to` by who receives the message:
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144* **Another of your sessions**: `{ sessionId }`
145* **A subagent or teammate**: `{ agentId }`, with an id from `$.agent.list()`
146* **The sender of a message you received**: the string address that message came from
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148The call resolves once the message is queued, with `{ isDelivered: true }`. When nothing was delivered, it resolves with `{ isDelivered: false, reason }`, and `reason` says why.
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142150This hook answers a `/ping` command, [registered as a command](#add-a-command), by asking the session whose id you type after it for a status:
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