MCP Server for Cisco FMC

A read-only Model Context Protocol (MCP) server for Cisco Firepower Management Center (FMC) 7.4.x.

This server allows LLMs like Claude to query your firewall configuration, search for network objects, and check deployment status—all through natural language.

Features

Read-Only Access: Safe exploration of FMC configuration without modification risk
Rate Limiting: Built-in token bucket rate limiter (120 req/min, 10 concurrent connections)
Automatic Token Refresh: Handles FMC's 30-minute token expiration and 3-refresh limit
Transparent Pagination: Automatically fetches all pages from large datasets

MCP Resources

Resource	Description
`fmc://system/info`	FMC server version and system information
`fmc://devices/list`	List of all managed firewall devices
`fmc://objects/network`	All network objects (IPs, subnets)
`fmc://deployment/status`	Devices with pending changes

MCP Tools

Tool	Description
`search_object_by_ip`	Find network objects containing a specific IP
`get_deployment_status`	Check if devices are in sync

Installation

Prerequisites

Python 3.10+
uv (recommended) or pip
Access to a Cisco FMC 7.4.x instance

Using uv (Recommended)

# Clone the repository
git clone https://github.com/your-org/fmc-mcp.git
cd fmc-mcp

# Install dependencies
uv sync

Using pip

pip install -e .

Configuration

Copy the example configuration:

cp .env.example .env

Edit .env with your FMC credentials:

FMC_HOST=fmc.example.com
FMC_USERNAME=api_user
FMC_PASSWORD=your_password_here

Configuration Options

Variable	Required	Default	Description
`FMC_HOST`	Yes	-	FMC hostname or IP
`FMC_USERNAME`	Yes	-	API username
`FMC_PASSWORD`	Yes	-	API password
`FMC_VERIFY_SSL`	No	`false`	SSL certificate verification
`FMC_DOMAIN_UUID`	No	auto	Domain UUID (auto-discovered)
`FMC_TIMEOUT`	No	`60`	Request timeout in seconds

Usage

Running the Server

# Using uv
uv run python -m fmc_mcp

# Or using the CLI entry point
uv run mcp-server-fmc

Testing Connection

uv run python -c "from fmc_mcp.client import FMCClient; import asyncio; asyncio.run(FMCClient().test_connection())"

Claude Desktop Integration

Add to your Claude Desktop configuration (claude_desktop_config.json):

{
  "mcpServers": {
    "fmc": {
      "command": "uv",
      "args": ["run", "--directory", "/path/to/fmc-mcp", "python", "-m", "fmc_mcp"]
    }
  }
}

Then restart Claude Desktop and try:

"What version is my FMC running?"
"List all firewall devices"
"Find the network object for IP 10.10.10.5"
"Are there any pending deployments?"

MCP Inspector Testing

# Install MCP Inspector
npx @anthropic/mcp-inspector

# Run the server
uv run python -m fmc_mcp

Development

Running Tests

# Run all tests
uv run pytest -v

# Run with coverage
uv run pytest --cov=src/fmc_mcp --cov-report=term-missing

Code Quality

# Linting
uv run ruff check src/ tests/

# Type checking
uv run mypy src/

API Rate Limits

The FMC API has strict rate limits that this server respects:

Limit	Value	How We Handle It
Requests per minute	120	Token bucket rate limiter
Concurrent connections	10	Connection semaphore
Token lifetime	30 min	Auto-refresh on 401
Max token refreshes	3	Full re-authentication after 3

The server logs warnings when approaching rate limits:

WARNING when token bucket drops below 20%
ERROR on 429 (rate limited) responses

Security Notes

Read-Only: This server only performs GET requests
SSL: Disabled by default for lab environments; enable in production
Credentials: Store in .env, never commit to version control
API User: Create a dedicated read-only API user in FMC

License

Apache 2.0

Cisco FMC MCP Server