14 pages for sendmessage.

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 …-the-web) sessions 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 …gher usage limit from their admin * Added cross-session messaging (`SendMessage` / `ListAgents`) between sessions on the same machine on Bedrock, Vertex, and Foundry, and when telemetry is disabled… Message your other Claude Code sessions Claude Code CLI · in the page cross-session-messaging …ls for this: `ListAgents` to discover which agents it can reach, and `SendMessage` to deliver a message to one of them by name. With the same `SendMessage` tool, Claude can also message [subagents](/d… 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… 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`. Claude Code removes every other built-in tool from a background subagent, whether inherited or liste… Tools reference Claude Code CLI · in the page tools-reference …| `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 …div> <div>Agent messaging is hardened: messages relayed via <code>SendMessage</code> from other agents no longer carry user authority, and auto mode blocks them</div> <div>Amazon Bedrock reads… Week 32 · August 3–7, 2026 Claude Code CLI · in the page whats-new/2026-w32 …r sessions with the <code>ListAgents</code> tool and sends with <code>SendMessage</code>, either when you ask it to or on its own, such as after a change in one session affects what another is working… Week 33 · August 10–14, 2026 Claude Code CLI · in the page whats-new/2026-w33 …laude session</a> by name, and Claude messages it directly with <code>SendMessage</code>; a bare name that matches exactly one live session now delivers without a confirmation step</div> <div>Inte… Week 34 · August 17–21, 2026 Claude Code CLI · in the page whats-new/2026-w34 …div> <div>With the <code>notify\_when\_idle</code> input on <code>SendMessage</code>, Claude can ask another Claude Code session on the same machine to <a href="/docs/docs/en/cross-session-messagi… 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. If your widget represents a single piece of state, such as a shopping cart or a dashboard, only the most…