Scout Monitoring (local)

Scout Monitoring MCP

This repository contains code to locally run an MCP server that can access Scout Monitoring data via Scout's API. We provide a Docker image that can be pulled and run by your AI Assistant to access Scout Monitoring data.

This puts Scout Monitoring's performance and error data directly in the hands of your AI Assistant. For Rails, Django, FastAPI, Laravel and more. Use it to get traces and errors with line-of-code information that the AI can use to target fixes right in your editor and codebase. N+1 queries, slow endpoints, slow queries, memory bloat, throughput issues - all your favorite performance problems surfaced and explained right where you are working.

If this makes your life a tiny bit better, why not :star: it?!

Setup Wizard

The simplest way to configure and start using the Scout MCP is with our interactive setup wizard. It handles all the prereqs and installation steps for you.

Run via npx:

npx @scout_apm/wizard

Build and run from source:

cd ./wizard
npm install
npm run build
node dist/wizard.js

The wizard will guide you through:

• Selecting your AI coding platform (Cursor, Claude Code, Claude Desktop)
• Entering your Scout API key
• Automatically configuring the MCP server settings

Supported Platforms

The wizard currently supports setup for:

• Cursor - Automatically configures MCP settings
• Claude Code (CLI) - Provides the correct command to run
• Claude Desktop - Updates the configuration file for Windows/Mac

For all others, it will output JSON that you can copy/paste into your AI Assistant's MCP configuration.

Prerequisites

The Wizard is a great way to get started, but you can also set things up manually. You will need to have or create a Scout Monitoring account and obtain an API key.

1. Sign up
2. Install the Scout Agent in your application and send Scout data!
   • Ruby
   • Python
   • PHP
   • If you are trying this out locally, make sure monitor: true, errors_enabled: true are set in your config for the best experience
3. Visit settings to get or create an API key
   • This is not your "Agent Key"; it's the "API Key" that can be created on the Settings page
   • This is a read-only key that can only access data in your account
4. Install Docker. Instructions below assume you can start a Docker container

The MCP server will not currently start without an API key set, either in the environment or by a command-line argument on startup.

Installation

We recommend using the provided Docker image to run the MCP server. It is intended to be started by your AI Assistant and configured with your Scout API key. Many local clients allow specifying a command to run the MCP server in some location. A few examples are provided below.

The Docker image is available on Docker Hub.

Of course, you can always clone this repo and run the MCP server directly; uv or other environment management tools are recommended.

Configure a local Client (e.g. Claude/Cursor/VS Code Copilot)

If you would like to configure the MCP manually, this usually just means supplying a command to run the MCP server with your API key in the environment to your AI Assistant's config. Here is the shape of the JSON (the top-level key varies):

{
  "mcpServers": {
    "scout-apm": {
      "command": "docker",
      "args": ["run", "--rm", "-i", "--env", "SCOUT_API_KEY", "scoutapp/scout-mcp-local"],
      "env": { "SCOUT_API_KEY": "your_scout_api_key_here"}
    }
  }
}

claude mcp add scoutmcp -e SCOUT_API_KEY=your_scout_api_key_here -- docker run --rm -i -e SCOUT_API_KEY scoutapp/scout-mcp-local

MAKE SURE to update the SCOUT_API_KEY value to your actual api key in Arguments in the Cursor Settings > MCP

• VS Code Copilot docs
  • We recommend the "Add an MCP server to your workspace" option

Add the following to your claude config file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "scout-apm": {
      "command": "docker",
      "args": ["run", "--rm", "-i", "--env", "SCOUT_API_KEY", "scoutapp/scout-mcp-local"],
      "env": { "SCOUT_API_KEY": "your_scout_api_key_here"}
    }
  }
}

Using the Scout Monitoring MCP

Scout's MCP is intended to put error and performance data directly in the... hands? of your AI Assistant. Use it to get traces and errors with line-of-code information that the AI can use to target fixes right in your editor.

Most assistants will show you both raw tool calls and perform analysis. Desktop assistants can readily create custom JS applications to explore whatever data you desire. Assistants integrated into code editors can use trace data and error backtraces to make fixes right in your codebase.

Combine Scout's MCP with your AI Assistant's other tools to:

• Create rich GitHub/GitLab issues based on errors and performance data
• Make JIRA fun - have your AI Assistant create tickets with all the details
• Generate PRs that fix specific errors and performance problems

Tools

The Scout MCP provides the following tools for accessing Scout APM data:

• list_apps - List available Scout APM applications, with optional filtering by last active date
• get_app_metrics - Get individual metric data (response_time, throughput, etc.) for a specific application
• get_app_endpoints - Get all endpoints for an application with aggregated performance metrics
• get_endpoint_metrics - Get timeseries metrics for a specific endpoint in an application
• get_app_endpoint_traces - Get recent traces for an app filtered to a specific endpoint
• get_app_trace - Get an individual trace with all spans and detailed execution information
• get_app_error_groups - Get recent error groups for an app, optionally filtered by endpoint
• get_app_insights - Get performance insights including N+1 queries, memory bloat, and slow queries

Resources

The Scout MCP provides configuration templates as resources that your AI assistant can read and apply:

• scoutapm://config-resources/{framework} - Setup instructions for supported framework or library (rails, django, flask, fastapi)
• scoutapm://config-resources/list - List all available configuration templates
• scoutapm://metrics - List of all available metrics for Scout APM

Useful Prompts

Setup & Configuration

• "Help me set up Scout monitoring for my Rails application"
• "Create a Scout APM config file for my Django project with key ABC123"

Performance & Monitoring

• "Summarize the available tools in the Scout Monitoring MCP."
• "Find the slowest endpoints for app my-app-name in the last 7 days. Generate a table with the results including the average response time, throughput, and P95 response time."
• "Show me the highest-frequency errors for app Foo in the last 24 hours. Get the latest error detail, examine the backtrace and suggest a fix."
• "Get any recent n+1 insights for app Bar. Pull the specific trace by id and help me optimize it based on the backtrace data."

Token Usage

We are currently more interested in expanding available information than strictly controlling response size from our MCP tools. If your AI Assistant has a configurable token limit (e.g. Claude Code export MAX_MCP_OUTPUT_TOKENS=50000), we recommend setting it generously high, e.g. 50,000 tokens.

Local Development

We use uv and taskipy to manage environments and run tasks for this project.

Run with Inspector

uv run task dev

Connect within inspector to add API key, set to STDIO transport

Build the Docker image

docker build -t scout-mcp-local .

Release

1. Branch and bump versions with uv run python bump_versions.py
2. Get that merged
3. Create a GitHub release with the new version (gh release create v2025.11.3 --generate-notes --draft)

Publishing the release pushes the v* tag, and CI publishes the Docker image, the PyPI package, and then the MCP Registry entries:

• server.json → com.scoutapm/scout-mcp-local (this server; its version is bumped by bump_versions.py)
• server.remote.json → com.scoutapm/scout-monitoring (the hosted server at https://scoutapm.com/mcp). Bump its version by hand when you change its metadata; unchanged versions are skipped.

MCP Registry key

The registry verifies we own the com.scoutapm/* namespace through a DNS TXT record at the scoutapm.com apex holding an Ed25519 public key. CI signs in with the matching private key from the MCP_REGISTRY_PRIVATE_KEY repository secret. To rotate it:

openssl genpkey -algorithm Ed25519 -out key.pem
# Public key for the TXT record: replace the existing v=MCPv1 record, don't add a second one
echo "v=MCPv1; k=ed25519; p=$(openssl pkey -in key.pem -pubout -outform DER | tail -c 32 | base64)"
# Private key (hex) for the MCP_REGISTRY_PRIVATE_KEY secret
openssl pkey -in key.pem -noout -text | grep -A3 "priv:" | tail -n +2 | tr -d ' :\n'

For the bots:

mcp-name: com.scoutapm/scout-mcp-local