LibreNMS MCP

LibreNMS MCP Server

LibreNMS MCP Server is a Python-based Model Context Protocol (MCP) server designed to provide advanced, programmable access to LibreNMS network monitoring data and management features. It exposes a modern API for querying, automating, and integrating LibreNMS resources such as devices, ports, alerts, inventory, locations, logs, and more. The server supports both read and write operations, robust security features, and is suitable for integration with automation tools, dashboards, and custom network management workflows.

Features

Core Features

• Query LibreNMS devices, ports, inventory, locations, logs, and alerts with flexible filtering
• Retrieve network topology, device status, and performance metrics
• Access and analyze alert history, event logs, and system health
• Monitor interface statistics, port status, and traffic data
• Track endpoints and connected devices by MAC or IP address
• Retrieve and manage device groups, port groups, and poller groups
• Get detailed information about network services and routing

Management Operations

• Create, update, and delete devices, ports, and groups (if enabled)
• Manage alert rules, notifications, and device metadata
• Configure read-only mode to restrict all write operations for safe monitoring
• Support for bulk operations on devices and ports

Advanced Capabilities

• Rate limiting and API security features
• Real-time network monitoring and health tracking
• Comprehensive logging and audit trails
• SSL/TLS support and configurable timeouts
• Optional tool-search transform for large tool catalogs
• Extensible with custom middlewares and utilities

Installation

Prerequisites

• Python 3.11 to 3.14
• Access to a LibreNMS
• Valid LibreNMS token with appropriate permissions

Quick Install from PyPI

The easiest way to get started is to install from PyPI:

# Using UV (recommended)
uvx librenms-mcp

# Or using pip
pip install librenms-mcp

Remember to configure the environment variables for your LibreNMS instance before running the server:

# Create environment configuration
export LIBRENMS_URL=https://domain.tld:8443
export LIBRENMS_TOKEN=your-librenms-token

For more details, visit: https://pypi.org/project/librenms-mcp/

Install from Source

1. Clone the repository:

git clone https://github.com/mhajder/librenms-mcp.git
cd librenms-mcp

2. Install dependencies:

# Using UV (recommended)
uv sync

# Or using pip
pip install -e .

3. Configure environment variables:

cp .env.example .env
# Edit .env with your LibreNMS url and token

4. Run the server:

# Using UV (recommended)
uv run librenms-mcp

# Or using the installed command directly
librenms-mcp

Using Docker

A Docker images are available on GitHub Packages for easy deployment.

# Normal STDIO image
docker pull ghcr.io/mhajder/librenms-mcp:latest

# MCPO image for usage with Open WebUI
docker pull ghcr.io/mhajder/librenms-mcpo:latest

Development Setup

For development with additional tools:

# Clone and install with development dependencies
git clone https://github.com/mhajder/librenms-mcp.git
cd librenms-mcp
uv sync --group dev

# Run tests
uv run pytest

# Run with coverage
uv run pytest --cov=src/

# Run linting and formatting
uv run ruff check .
uv run ruff format .

# Run type checking
uv run ty check .

# Setup pre-commit hooks
uv run prek install

Configuration

Environment Variables

# LibreNMS Connection Details
LIBRENMS_URL=https://domain.tld:8443
LIBRENMS_TOKEN=your-librenms-token

# SSL Configuration
LIBRENMS_VERIFY_SSL=true
LIBRENMS_TIMEOUT=30

# Read-Only Mode
# Set READ_ONLY_MODE true to disable all write operations (put, post, delete)
READ_ONLY_MODE=false

# Disabled Tags
# Comma-separated list of tags to disable tools for (empty by default)
# Example: DISABLED_TAGS=alert,bills
DISABLED_TAGS=

# Logging Configuration
LOG_LEVEL=INFO

# Rate Limiting (requests per minute)
# Set RATE_LIMIT_ENABLED true to enable rate limiting
RATE_LIMIT_ENABLED=false
RATE_LIMIT_MAX_REQUESTS=100
RATE_LIMIT_WINDOW_MINUTES=1

# Tool Search Transform (Optional)
# Set TOOL_SEARCH_ENABLED true to replace full tool listings with search_tools + call_tool
TOOL_SEARCH_ENABLED=false
# Search strategy: bm25 (natural language) or regex (pattern match)
TOOL_SEARCH_STRATEGY=bm25
# Maximum number of tools returned by search_tools
TOOL_SEARCH_MAX_RESULTS=5

# Sentry Error Tracking (Optional)
# Set SENTRY_DSN to enable error tracking and performance monitoring
# SENTRY_DSN=https://your-key@o12345.ingest.us.sentry.io/6789
# Optional Sentry configuration
# SENTRY_TRACES_SAMPLE_RATE=1.0
# SENTRY_SEND_DEFAULT_PII=true
# SENTRY_ENVIRONMENT=production
# SENTRY_RELEASE=1.2.3
# SENTRY_PROFILE_SESSION_SAMPLE_RATE=1.0
# SENTRY_PROFILE_LIFECYCLE=trace
# SENTRY_ENABLE_LOGS=true

# MCP Transport Configuration
# Transport type: 'stdio' (default), 'sse' (Server-Sent Events), or 'http' (HTTP Streamable)
MCP_TRANSPORT=stdio

# HTTP Transport Settings (used when MCP_TRANSPORT=sse or MCP_TRANSPORT=http)
# Host to bind the HTTP server (default: 127.0.0.1)
# MCP_HTTP_HOST=127.0.0.1
# Port to bind the HTTP server (default: 8000)
# MCP_HTTP_PORT=8000
# Optional bearer token for authentication (leave empty for no auth)
# MCP_HTTP_BEARER_TOKEN=

Available Tools

Device & Inventory Tools

• devices_list: List all devices (with optional filters)
• device_get: Get details for a specific device
• device_add: Add a new device
• device_update: Update device metadata
• device_delete: Remove a device
• device_ports: List all ports for a device
• device_ports_get: Get details for a specific port on a device
• device_fdb: List the forwarding database (learned MACs) for a device
• device_nac: List network access control (802.1X / MAB) sessions on a device
• device_availability: Get device availability
• device_outages: Get device outages
• device_set_maintenance: Set device maintenance mode
• device_discover: Discover or add a device using provided credentials
• device_rename: Rename an existing device
• device_maintenance_status: Get the maintenance status for a device
• device_vlans: List VLANs for a device
• device_links: List links for a device
• device_eventlog_add: Add an event log entry for a device
• inventory_device: Get inventory for a device
• inventory_device_flat: Get flat inventory for a device
• devicegroups_list: List device groups
• devicegroup_add: Add a device group
• devicegroup_update: Update a device group
• devicegroup_delete: Delete a device group
• devicegroup_devices: List devices in a device group
• devicegroup_set_maintenance: Set maintenance for a device group
• devicegroup_add_devices: Add devices to a device group
• devicegroup_remove_devices: Remove devices from a device group
• locations_list: List all locations
• location_add: Add a location
• location_edit: Edit a location
• location_delete: Delete a location
• location_get: Get details for a location
• location_set_maintenance: Set maintenance for a location

Port & Port Group Tools

• ports_list: List all ports (with optional filters)
• ports_search: Search ports (general search)
• ports_search_field: Search ports by a specific field
• ports_search_mac: Search ports by MAC address
• port_get: Get details for a specific port
• port_fdb: List MAC addresses learned on a port
• port_ip_info: Get IP address information for a port
• port_transceiver: Get transceiver information for a port
• port_description_get: Get a port description
• port_description_update: Update a port description
• port_groups_list: List port groups
• port_group_add: Add a port group
• port_group_list_ports: List ports in a port group
• port_group_assign: Assign ports to a port group
• port_group_remove: Remove ports from a port group

Port Security Tools

• port_security_list: List port security configuration across all devices
• port_security_device: Get port security configuration for a device
• port_security_port: Get port security configuration for a single port

Graph Tools

Graphs are returned as MCP images. LibreNMS serves SVG on current releases and PNG on older ones; the MIME type is taken from the response.

• device_graphs_list: List the graph types available for a device
• device_graph: Render a device-level graph (e.g. device_icmp_perf)
• port_graph: Render a per-port graph by interface name (bits, upkts, errors, etherlike)
• port_group_graph: Render a traffic graph for one or more ports by port ID

port_graph falls back to the port-group endpoint for bits when the per-port endpoint fails, which works around LibreNMS releases that return a 500 naming an empty graph type.

Alerting & Logging Tools

• alerts_get: List current and historical alerts
• alert_get_by_id: Get details for a specific alert
• alert_acknowledge: Acknowledge an alert
• alert_unmute: Unmute an alert
• alert_rules_list: List alert rules
• alert_rule_get: Get details for a specific alert rule
• alert_rule_add: Add an alert rule
• alert_rule_edit: Edit an alert rule
• alert_rule_delete: Delete an alert rule
• alert_templates_list: List all alert templates
• alert_template_get: Get a specific alert template
• alert_template_create: Create a new alert template
• alert_template_edit: Edit an alert template
• logs_eventlog: Get event log for a device
• logs_syslog: Get syslog for a device
• logs_alertlog: Get alert log for a device
• logs_authlog: Get auth log for a device
• logs_syslogsink: Add a syslog sink

Billing Tools

• bills_list: List bills
• bill_get: Get details for a bill
• bill_graph: Render a bill graph as an image
• bill_graph_data: Get bill graph data
• bill_history: Get bill history
• bill_history_graph: Render a bill history graph as an image
• bill_history_graph_data: Get bill history graph data
• bill_create_or_update: Create or update a bill
• bill_delete: Delete a bill

Oxidized Tools

• oxidized_list: List devices tracked by Oxidized for config backup
• oxidized_config_get: Get the stored configuration for a specific device
• oxidized_config_search: Search all stored device configurations for a string

Network & Monitoring Tools

• arp_search: Search ARP entries

• poller_group_get: Get poller group(s)

• routing_ip_addresses: List all IP addresses from LibreNMS.

• services_list: List all services from LibreNMS.

• services_for_device: Get services for a device from LibreNMS.

• service_add: Add a service to LibreNMS

• service_edit: Edit an existing service

• service_delete: Delete a service

• bgp_sessions: List BGP sessions

• bgp_session_get: Get details for a specific BGP session

• bgp_session_edit: Edit a BGP session

• fdb_lookup: Lookup forwarding database (FDB) entries

• nac_list: List network access control (802.1X / MAB) sessions across all devices

• ospf_list: List OSPF instances

• ospf_ports: List OSPF ports

• vrf_list: List VRFs

• ping: Ping the LibreNMS system

• health_list: List health sensors

• health_by_type: List health sensors by type

• health_sensor_get: Get details for a health sensor

• sensors_list: List sensors

• switching_vlans: List all VLANs from LibreNMS.

• switching_links: List all links from LibreNMS.

• system_info: Get system info from LibreNMS.

• Flexible filtering and search for all major resources (devices, ports, alerts, logs, inventory, etc.)

Pagination & Limit Support

To prevent overloading LLM contexts when querying large LibreNMS production instances, all list, search, and log tools support pagination.

Key Features

• Sensible Defaults: All list tools default to returning 100 results per page.
• Unified Parameters:
  • limit: The maximum number of results to return (defaults to 100, minimum 1).
  • offset (or start for log tools): The number of results to skip.
• Pagination Metadata: Every paginated response includes metadata fields:
  • limit: The active limit.
  • offset (or start): The active offset.
  • count: The number of items returned in the current page.
  • total: The total number of items available (for log tools, this is provided if returned by the LibreNMS API).

Security & Safety Features

Read-Only Mode

The server supports a read-only mode that disables all write operations for safe monitoring:

READ_ONLY_MODE=true

Tag-Based Tool Filtering

You can disable specific categories of tools by setting disabled tags:

DISABLED_TAGS=alert,bills

Tool Search for Large Toolsets

FastMCP tool search can reduce prompt size for servers with many tools. When enabled, list_tools returns two synthetic tools:

• search_tools: Finds matching tools and returns their full schemas
• call_tool: Executes any discovered tool by name

Enable it with:

TOOL_SEARCH_ENABLED=true
TOOL_SEARCH_STRATEGY=bm25    # bm25 or regex
TOOL_SEARCH_MAX_RESULTS=5    # optional, default is 5

bm25 supports natural language queries, while regex uses a regex pattern input for deterministic matching.

Tool search respects existing visibility controls (read-only mode and disabled tags).

Rate Limiting

The server supports rate limiting to control API usage and prevent abuse. If enabled, requests are limited per client using a sliding window algorithm.

Enable rate limiting by setting the following environment variables in your .env file:

RATE_LIMIT_ENABLED=true
RATE_LIMIT_MAX_REQUESTS=100   # Maximum requests allowed per window
RATE_LIMIT_WINDOW_MINUTES=1   # Window size in minutes

If RATE_LIMIT_ENABLED is set to true, the server will apply rate limiting middleware. Adjust RATE_LIMIT_MAX_REQUESTS and RATE_LIMIT_WINDOW_MINUTES as needed for your environment.

Sentry Error Tracking & Monitoring (Optional)

The server optionally supports Sentry for error tracking, performance monitoring, and debugging. Sentry integration is completely optional and only initialized if configured.

Installation

To enable Sentry monitoring, install the optional dependency:

# Using UV (recommended)
uv sync --extra sentry

Configuration

Enable Sentry by setting the SENTRY_DSN environment variable in your .env file:

# Required: Sentry DSN for your project
SENTRY_DSN=https://your-key@o12345.ingest.us.sentry.io/6789

# Optional: Performance monitoring sample rate (0.0-1.0, default: 1.0)
SENTRY_TRACES_SAMPLE_RATE=1.0

# Optional: Include personally identifiable information (default: true)
SENTRY_SEND_DEFAULT_PII=true

# Optional: Environment name (e.g., "production", "staging")
SENTRY_ENVIRONMENT=production

# Optional: Release version (auto-detected from package if not set)
SENTRY_RELEASE=1.2.2

# Optional: Profiling - continuous profiling sample rate (0.0-1.0, default: 1.0)
SENTRY_PROFILE_SESSION_SAMPLE_RATE=1.0

# Optional: Profiling - lifecycle mode for profiling (default: "trace")
# Options: "all", "continuation", "trace"
SENTRY_PROFILE_LIFECYCLE=trace

# Optional: Enable log capture as breadcrumbs and events (default: true)
SENTRY_ENABLE_LOGS=true

Features

When enabled, Sentry automatically captures:

• Exceptions & Errors: All unhandled exceptions with full context
• Performance Metrics: Request/response times and traces
• MCP Integration: Detailed MCP server activity and interactions
• Logs & Breadcrumbs: Application logs and event trails for debugging
• Context Data: Environment, client info, and request parameters

Getting a Sentry DSN

1. Create a free account at sentry.io
2. Create a new Python project
3. Copy your DSN from the project settings
4. Set it in your .env file

Disabling Sentry

Sentry is completely optional. If you don't set SENTRY_DSN, the server will run normally without any Sentry integration, and no monitoring data will be collected.

SSL/TLS Configuration

The server supports SSL certificate verification and custom timeout settings:

LIBRENMS_VERIFY_SSL=true    # Enable SSL certificate verification
LIBRENMS_TIMEOUT=30         # Connection timeout in seconds

Transport Configuration

The server supports multiple transport mechanisms for the MCP protocol:

STDIO Transport (Default)

The default transport uses standard input/output for communication. This is ideal for local usage and integration with tools that communicate via stdin/stdout:

MCP_TRANSPORT=stdio

HTTP SSE Transport (Server-Sent Events)

For network-based deployments, you can use HTTP with Server-Sent Events. This allows the MCP server to be accessed over HTTP with real-time streaming:

MCP_TRANSPORT=sse
MCP_HTTP_HOST=127.0.0.1        # Localhost
MCP_HTTP_PORT=8000           # Port to listen on
MCP_HTTP_BEARER_TOKEN=your-secret-token  # Optional authentication token

When using SSE transport with a bearer token, clients must include the token in their requests:

curl -H "Authorization: Bearer your-secret-token" http://localhost:8000/sse

HTTP Streamable Transport

The HTTP Streamable transport provides HTTP-based communication with request/response streaming. This is ideal for web integrations and tools that need HTTP endpoints:

MCP_TRANSPORT=http
MCP_HTTP_HOST=127.0.0.1        # Localhost
MCP_HTTP_PORT=8000           # Port to listen on
MCP_HTTP_BEARER_TOKEN=your-secret-token  # Optional authentication token

When using streamable transport with a bearer token:

curl -H "Authorization: Bearer your-secret-token" \
     -H "Accept: application/json, text/event-stream" \
     -H "Content-Type: application/json" \
     -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' \
     http://localhost:8000/mcp

Note: The HTTP transport requires proper JSON-RPC formatting with jsonrpc and id fields. The server may also require session initialization for some operations.

For more information on FastMCP transports, see the FastMCP documentation.

Contributing

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Make your changes
4. Run tests and ensure code quality (uv run pytest && uv run ruff check .)
5. Commit your changes (git commit -m 'Add amazing feature')
6. Push to the branch (git push origin feature/amazing-feature)
7. Open a Pull Request

License

MIT License - see LICENSE file for details.