> ## Documentation Index
> Fetch the complete documentation index at: https://docs.plungeai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# MCP endpoint (JSON-RPC)

> The Streamable HTTP MCP endpoint: `initialize`, then `tools/list` and `tools/call`. The samples use the MCP host `https://mcp.plungeai.com/v1`, the same server.


## OpenAPI

```yaml openapi.json post /v1/mcp
openapi: 3.1.0
info:
  title: Ocean One API
  version: 2.1.0
servers:
  - url: https://api.plungeai.com
paths:
  /v1/mcp:
    post:
      summary: Inbound MCP Streamable-HTTP pass-through — point any MCP client here with an ozk_ key
      security:
        - ozkBearer: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              description: JSON-RPC 2.0 message
      responses:
        "200":
          description: JSON-RPC response (JSON, or SSE for streamed tool calls)
          content:
            application/json:
              schema:
                type: object
                description: JSON-RPC 2.0 response
            text/event-stream:
              schema:
                type: string
        "429":
          description: rate_limited — Retry-After header
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Error"
components:
  schemas:
    Error:
      type: object
      description: Standard error envelope. Every error response also carries an `X-Error-Code` response header equal to error.code, so a client branches on the header regardless of the negotiated body format (json | yaml | markdown | text). When the request created an execution, the `X-Execution-Id` response header is also set. Errors follow the negotiated format like success bodies.
      properties:
        error:
          type: object
          properties:
            code:
              type: string
            message:
              type: string
          required:
            - code
            - message
          additionalProperties: true
      required:
        - error
  securitySchemes:
    ozkBearer:
      type: http
      scheme: bearer
      description: "ozk_ platform API key (Authorization: Bearer ozk_…)"
```