---
title: "Send a message to another assistant."
method: POST
path: "/ai_assistants/{assistant_id}/send_to_assistant"
tags: ["AI Assistants"]
---

# Send a message to another assistant.

`POST /ai_assistants/{assistant_id}/send_to_assistant`

## Request

- Base URL: `https://h2ogpte.genai.h2o.ai/api/v1`
- URL: `https://h2ogpte.genai.h2o.ai/api/v1/ai_assistants/{assistant_id}/send_to_assistant`
- Auth: HTTP bearer
- TypeScript: <https://skmtc.dev/h2o/apis/h2ogpte-rest-api/docs/ai_assistants/:assistant_id/send_to_assistant/post.ts> (a function with typed inputs; its response is checked against the schema)

Sends a direct message from one assistant to another, triggering a wake event on the recipient.

## Path parameters

- `assistant_id` string, required

## Request body

- InterAssistantMessageRequest
  - `recipient_assistant_id` string, uuid, required
  - `content` string, required: Message content (max 100000 chars).
  - `metadata` object: Optional metadata.

## Response `201`

Successful operation

- InterAssistantMessage
  - `id` string, uuid
  - `sender_assistant_id` string, uuid
  - `recipient_assistant_id` string, uuid
  - `content` string
  - `metadata` object
  - `wake_cycle` integer
  - `created_at` string, date-time

## Other responses

- `401`: Unauthorized - Invalid or missing API key
- `default`: Unexpected error

## Changes

- **2026-11-06** `a82a117320f4`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/h2o/apis/h2ogpte-rest-api/changes/ai_assistants/:assistant_id/send_to_assistant/post.md)

---

[API](https://skmtc.dev/h2o/apis/h2ogpte-rest-api.md) - [All operations](https://skmtc.dev/h2o/apis/h2ogpte-rest-api/llms.txt) - [OpenAPI document](https://skmtc.dev/h2o/apis/h2ogpte-rest-api/revisions/a82a117320f4?raw)