---
title: "Send Channel Message"
method: POST
path: "/channels/tools/messages/send"
tags: ["Channels"]
---

# Send Channel Message

`POST /channels/tools/messages/send`

## Request body

- ChannelMessageSendRequest
  - `artifact_id` string, uuid, required
  - `session_id` string, required
  - `tool_call_id` string, required
  - `destination_id` string, required
  - `text` string, required
  - `thread_id` string, nullable

## Response `200`

Successful Response

- ChannelSendResult — `sent` only with the provider's acknowledgement; `unknown` when the post may have reached the chat without a receipt, which is never retried.
  - `delivery_id` string, required
  - `state` 'sent' | 'failed' | 'unknown', required
  - `message_id` string, nullable
  - `thread_id` string, nullable
  - `reason` string, nullable

## Other responses

- `422` — Validation Error

## Changes

- **2026-09-25** `ec21cdc5486c` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/agenta-ai/apis/agenta-api/changes/channels/tools/messages/send/post.md)

---

[API](https://skmtc.dev/agenta-ai/apis/agenta-api.md) · [All operations](https://skmtc.dev/agenta-ai/apis/agenta-api/llms.txt) · [OpenAPI document](https://skmtc.dev/agenta-ai/apis/agenta-api/revisions/72f2feba8ccb?raw)