Semaphore Server

M8ven Score

A Model Context Protocol (MCP) server for Semaphore UI - the modern open-source alternative to Ansible Tower/AWX.

This server enables AI assistants and MCP-compatible tools to interact with Semaphore UI for managing Ansible, Terraform, and other automation workflows.

Features

• Project Management — List, create, and delete projects
• Task Management — Launch, monitor, stop, and retrieve output of tasks
• Template Management — CRUD operations on job templates
• Inventory Management — Manage Ansible inventories
• Repository Management — Manage Git repositories
• Environment Management — Manage environment variable sets
• Key Store — List and manage SSH keys and credentials
• Schedule Management — Create and manage cron-based schedules
• User & Events — Get user info and project event logs
• Server Info — Check server health and version

Installation

pip install -e .

Or with the semaphore client from a local path:

pip install -e /path/to/python3-semaphore-client
pip install -e .

Configuration

Copy .env.example to .env and configure:

cp .env.example .env

Required environment variables:

Variable	Description
SEMAPHORE_URL	Base URL of your Semaphore UI instance (e.g., http://localhost:3000)
SEMAPHORE_TOKEN	API Bearer token (create via Semaphore UI or API)

Optional environment variables:

Variable	Default	Description
READ_ONLY	true	Set to false to enable write operations
DEBUG	(unset)	Set to true for verbose logging

Creating an API Token

1. Via Web UI (Semaphore 2.14+): Go to your user settings and create a token
2. Via API:

   # Login
   curl -c /tmp/semaphore-cookie -XPOST \
     -H 'Content-Type: application/json' \
     -d '{"auth": "YOUR_LOGIN", "password": "YOUR_PASSWORD"}' \
     http://localhost:3000/api/auth/login
   
   # Generate token
   curl -b /tmp/semaphore-cookie -XPOST \
     http://localhost:3000/api/user/tokens
   

Usage

Running the MCP Server

semaphore-mcp

MCP Configuration

Add to your MCP client configuration (e.g., VS Code mcp.json):

{
  "servers": {
    "semaphore": {
      "command": "semaphore-mcp",
      "env": {
        "SEMAPHORE_URL": "http://localhost:3000",
        "SEMAPHORE_TOKEN": "your-token-here",
        "READ_ONLY": "false"
      }
    }
  }
}

Or for Claude Desktop (claude_desktop_config.json):

{
  "mcpServers": {
    "semaphore": {
      "command": "semaphore-mcp",
      "env": {
        "SEMAPHORE_URL": "http://localhost:3000",
        "SEMAPHORE_TOKEN": "your-token-here"
      }
    }
  }
}

Available Tools

Tool	Description
project_list	List all projects
project_get	Get project details
project_create	Create a new project
project_delete	Delete a project
task_list	List tasks in a project
task_get	Get task details
task_launch	Launch a task from a template
task_stop	Stop a running task
task_output	Get task output/log
task_delete	Delete a task
template_list	List templates in a project
template_get	Get template details
template_create	Create a new template
template_delete	Delete a template
inventory_list	List inventories in a project
inventory_get	Get inventory details
inventory_create	Create a new inventory
inventory_delete	Delete an inventory
repository_list	List repositories in a project
repository_get	Get repository details
repository_create	Create a new repository
repository_delete	Delete a repository
environment_list	List environments in a project
environment_get	Get environment details
environment_create	Create a new environment
environment_delete	Delete an environment
key_list	List keys/credentials in a project
key_get	Get key details
key_delete	Delete a key
schedule_list	List schedules in a project
schedule_create	Create a new schedule
schedule_delete	Delete a schedule
user_get_current	Get current user info
user_tokens	List user API tokens
event_list	List project events
server_info	Get server version/info
server_ping	Check server connectivity

Dependencies

This project uses python3-semaphore-client — an OpenAPI-generated Python client library for the Semaphore UI API (v2.16.14).

Development

# Install in development mode
pip install -e ".[dev]"

# Run directly
python -m src.semaphore_mcp_server

License

MIT