18 pages for sendmessage.

api Claude Developer Platform · in the page manage-claude/opentelemetry/api …s" "go.opentelemetry.io/otel/propagation" ) func sendMessage(ctx context.Context) error { body := strings.NewReader(`{ "events": [ { "type": "use… Subagents in the SDK Claude Code CLI · in the page agent-sdk/subagents …he subagent needs directly in that prompt. A subagent that has the [`SendMessage`](/docs/en/tools-reference) tool starts with a list of the other named agents running in the session, so it knows whic… Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …e-code-on-the-web) use to message each other, not the [cross-session `SendMessage` tool](/docs/en/cross-session-messaging), and Anthropic servers verified that both sessions belong to the same private… Orchestrate teams of Claude Code sessions Claude Code CLI · in the page agent-teams …inition's `tools` list. For an in-process teammate, Claude Code adds `SendMessage` to that list, and in a [session that has the Task tools](/docs/en/tools-reference#task-tool-availability) it adds `Ta… Claude Code changelog Claude Code CLI · in the page changelog …final report twice, once as the result and once as a message * Fixed `SendMessage` not finding a subagent by name after the CLI restarted and resumed the session (names given before the last compactio… Message your other Claude Code sessions Claude Code CLI · in the page cross-session-messaging …minals. Claude discovers the target with `ListAgents` and sends with `SendMessage`, so you never call either tool yourself. Claude can decide to send a message without being asked, and you can also pr… Choose a permission mode Claude Code CLI · in the page permission-modes …sifier also reviews each message Claude sends to another agent with [`SendMessage`](/docs/en/tools-reference), whether plain text or a structured [agent team](/docs/en/agent-teams) message, before Cla… Use the mods API Claude Code CLI · in the page plugins/mods/api …all `$.session.send({ to, text })`, which makes the same delivery the SendMessage tool makes. Set `to` by who receives the message: * **Another of your sessions**: `{ sessionId }` * **A subagent or t… Mods reference Claude Code CLI · in the page plugins/mods/reference …l, or `{ deny: reason }` | When Claude resumes a subagent with the [`SendMessage`](/docs/en/sub-agents#resume-subagents) tool, your `agent.spawn` hook doesn't run again. To refuse the `SendMessage` c… Claude Code settings Claude Code CLI · in the page settings …hines` | Require your explicit approval before Claude's `SendMessage` reaches one of your sessions beyond this machine; see [cross-session messaging](/docs/en/cross-session-messaging#requ… Create custom subagents Claude Code CLI · in the page sub-agents …ToolSearch`, `EnterWorktree`, `ExitWorktree`, `Monitor`, `TaskStop`, `SendMessage`, and `Artifact`, plus [`SubagentHandback`](/docs/en/tools-reference) for a subagent that reports through it. Claude C… Tools reference Claude Code CLI · in the page tools-reference …or) | No | | `ListAgents` | Lists the agents Claude can message with `SendMessage`: subagents in the session, [agent team](/docs/en/agent-teams) teammates, your other local Claude Code sessions, and,… Week 24 · June 8–12, 2026 Claude Code CLI · in the page whats-new/2026-w24 …now warn at startupAgent messaging is hardened: messages relayed via `SendMessage` from other agents no longer carry user authority, and auto mode blocks themAmazon Bedrock reads the AWS region from `… Week 32 · August 3–7, 2026 Claude Code CLI · in the page whats-new/2026-w32 …covers your other sessions with the `ListAgents` tool and sends with `SendMessage`, either when you ask it to or on its own, such as after a change in one session affects what another is working on. A… Week 33 · August 10–14, 2026 Claude Code CLI · in the page whats-new/2026-w33 …ssage-another-session) by name, and Claude messages it directly with `SendMessage`; a bare name that matches exactly one live session now delivers without a confirmation stepInteractive sessions on on… Week 34 · August 17–21, 2026 Claude Code CLI · in the page whats-new/2026-w34 …it and persists across restartsWith the `notify_when_idle` input on `SendMessage`, Claude can ask another Claude Code session on the same machine to [send one notice when it next goes idle](/docs/en/… Week 35 · August 24–28, 2026 Claude Code CLI · in the page whats-new/2026-w35 …put marked as partial, with a hint that Claude can [continue it with `SendMessage`](/docs/en/sub-agents#resume-subagents), instead of appearing finishedOn Amazon Bedrock, Google Cloud's Agent Platform… Supersede older widget instances Claude Documentation · in the page connectors/building/mcp-apps/instance-supersession …ps://modelcontextprotocol.github.io/ext-apps/api/classes/app.App.html#sendmessage) to Claude. This page is for MCP App developers whose widget represents a single piece of state, such as a shopping c…