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

# Discover a running engine

> Version, wire protocol, liveness and billing standing. No auth — a launching app needs this to decide whether to attach to a running engine or start its own. Attach only when `protocol` matches yours.



## OpenAPI

````yaml /api-reference/openapi.json get /engine/info
openapi: 3.1.0
info:
  title: Meradomo Public API
  version: 1.0.0
  description: >-
    Two surfaces: the local management API on 127.0.0.1:8765 (Publish) and the
    OAuth endpoints on account.meradomo.com (Connect). No SDK — these HTTP
    endpoints are the integration surface.
  license:
    name: MIT
servers:
  - url: http://127.0.0.1:8765
    description: Local management API (Publish)
  - url: https://account.meradomo.com
    description: Control plane (Connect / OAuth)
security: []
paths:
  /engine/info:
    get:
      tags:
        - Engine
      summary: Discover a running engine
      description: >-
        Version, wire protocol, liveness and billing standing. No auth — a
        launching app needs this to decide whether to attach to a running engine
        or start its own. Attach only when `protocol` matches yours.
      operationId: engineInfo
      responses:
        '200':
          description: Engine identity
          content:
            application/json:
              schema:
                type: object
                properties:
                  engineVersion:
                    type: string
                  protocol:
                    type: integer
                    example: 1
                  pid:
                    type: integer
                  mode:
                    type: string
                  connected:
                    type: boolean
                  host:
                    type: string
                    nullable: true
                  name:
                    type: string
                    nullable: true
                  firstPartyApp:
                    type: string
                    nullable: true
                  registrants:
                    type: integer
                  billing:
                    type: object
                    nullable: true
      servers:
        - url: http://127.0.0.1:8765

````