---
title: "Post Message"
method: POST
path: "/api/mcp/messages/{session_id}"
tags: ["mcp-sse"]
---

# Post Message

`POST /api/mcp/messages/{session_id}`

## Request

- Base URL: `https://app.ctlsurf.com` (the document declares no server; this is the origin it was published from)
- URL: `https://app.ctlsurf.com/api/mcp/messages/{session_id}`
- Auth: HTTP bearer

Endpoint for clients to send MCP messages.

Handles JSON-RPC style messages for MCP protocol.

## Path parameters

- `session_id` string, required

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/ctlsurf/apis/notebook-control-plane.md) · [All operations](https://skmtc.dev/ctlsurf/apis/notebook-control-plane/llms.txt) · [OpenAPI document](https://skmtc.dev/ctlsurf/apis/notebook-control-plane/revisions/ddfbbe20d5ce?raw)