---
title: "Stream Messages"
method: POST
path: "/api/v1/chat/{session_id}/messages/stream"
tags: ["Chat"]
---

# Stream Messages

`POST /api/v1/chat/{session_id}/messages/stream`

Stream agent events for a chat turn as Server-Sent Events.

## Path parameters

- `session_id` string, required

## Query parameters

- `project_id` string, uuid, nullable
- `organization_id` string, uuid, nullable

## Cookies

- `session` string, nullable

## Request body

- ChatParams — Request body for running a chat turn against one or more indexes.
  - `index_ids` string[], required — Indexes to retrieve data from.
  - `prompt` string, required — User message for this chat turn.

## Response `200`

Successful Response

- unknown

## Other responses

- `422` — Validation Error

## Changes

- **2026-06-09** `b17341164de9` — 2 info
  - added the optional property `detail/items/ctx` to the response with the `422` status
  - added the optional property `detail/items/input` to the response with the `422` status
- **2026-05-23** `34da5826db1c` — 1 info
  - endpoint added
- **2026-05-21** `fb63fb8d662c` — 1 breaking
  - api path removed without deprecation
- **2026-05-19** `64b8ab5b0a0a` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/run-llama/apis/llama-platform/changes/api/v1/chat/:session_id/messages/stream/post.md)

---

[API](https://skmtc.dev/run-llama/apis/llama-platform.md) · [All operations](https://skmtc.dev/run-llama/apis/llama-platform/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/run-llama/llama-platform/revisions/b17341164de9/schema)