---
title: "Add Messages To Session"
method: POST
path: "/api/v1/sessions/{session_id}/messages"
tags: ["sessions"]
---

# Add Messages To Session

`POST /api/v1/sessions/{session_id}/messages`

## Request

- Base URL: `https://api.gnosari.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api.gnosari.com/api/v1/sessions/{session_id}/messages`
- Auth: one of:
  - HTTP bearer
  - API key in header `X-AUTH-TOKEN`

Add messages to an existing session.

Supports three access levels based on session's agent/team:
- PUBLIC: No authentication required
- PASSWORD_PROTECTED: X-Access-Password header required
- PRIVATE: User authentication required

## Path parameters

- `session_id` string, required

## Headers

- `X-Access-Password` string, nullable

## Request body

- SessionMessageCreate[]
  - `message_data` string, required

## Response `200`

Successful Response

- SessionMessage[]
  - `message_data` string, required
  - `id` integer, required
  - `session_id` string, required
  - `created_at` string, date-time, required
  - `updated_at` string, date-time, required
  - `attachments` MessageAttachmentRef[]: Attachment references parsed from message_data content parts (Phase 7). Empty for text-only messages.
    - `asset_id` string, required
    - `kind` string, required: asset.kind vocabulary: image | document
    - `filename` string, nullable

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/gnosari/apis/gnosari-api.md) · [All operations](https://skmtc.dev/gnosari/apis/gnosari-api/llms.txt) · [OpenAPI document](https://skmtc.dev/gnosari/apis/gnosari-api/revisions/f299cf53ae5f?raw)