FBI Crime Data Server

PyPI CI codecov

An MCP (Model Context Protocol) server that provides access to the FBI's Crime Data Explorer API.

Query crime statistics, arrest data, hate crimes, NIBRS incidents, law enforcement employment, and more — directly from any MCP-compatible client.

Created for data journalists, researchers, and anyone interested in exploring US crime data with the power of language models. Initially created for use by the Policy Analyst Agent of the qsv Claude Cowork plugin.

Features

• 17 tools covering a wide range of crime data topics
  • Crime trends and Summary Reporting System (SRS) crime data
  • National Incident Based Reporting System (NIBRS) incident-based data and national estimates
  • Arrest statistics with demographic breakdowns
  • Hate crime incidents by bias motivation
  • Expanded homicide and property crime details
  • Police employment, Law Enforcement Officers Killed and Assaulted (LEOKA), Law Enforcement Suicide Data Collection (LESDC), and use of force
  • Agency lookup, reference data, cache management, and spillover reading
• Geographic query levels — national, state, and agency for most tools; some also support region (get_police_employment, get_nibrs_estimation) or agency-type / population-size breakdowns (get_nibrs_estimation) — all with automatic parameter validation
• Smart yearly aggregation — monthly API data is automatically rolled up into yearly totals (sums for counts, averages for rates, last value for population), with an option for monthly granularity
• Tiered disk-backed caching — 90-day time-to-live (TTL) for stable data (trends, reference, summaries, NIBRS estimation), 30-day TTL for dynamic data (incidents, arrests, agency lookups), and 1-day TTL for the homepage summary (refresh dates change frequently)
• Spillover handling — responses exceeding 128K characters are saved to disk with a preview returned, so large queries are never silently truncated
• Input validation — date format/ordering checks, offense and bias code validation, and level-based parameter requirements with clear error messages
• Sliding-window rate limiting — 1,000 requests/hour with transparent wait-time feedback
• Reference tools for agency lookups (by state, Originating Agency Identifier (ORI), or district with name filtering) and code translations

Quick Start

1. Get a free API key from api.data.gov

2. Run with Claude Desktop — add to your claude_desktop_config.json:

{
  "mcpServers": {
    "fbi-crime-data": {
      "command": "uvx",
      "args": ["fbi-crime-data-mcp"],
      "env": {
        "FBI_API_KEY": "your-api-key-here"
      }
    }
  }
}

3. Or run directly:

FBI_API_KEY=your-key uvx fbi-crime-data-mcp

Available Tools (17)

Core Crime Data

Tool	Description
get_summarized_crime_data	SRS crime data — rates, actuals, clearances for violent crime, property crime, homicide, rape, robbery, assault, burglary, larceny, motor vehicle theft, arson
get_nibrs_data	NIBRS incident-based data for 70+ offense types
get_arrest_data	Arrest statistics by offense with optional demographic breakdowns (male, female, sex, race)
get_crime_trends	National crime trend percent changes across 10 crime types
get_nibrs_estimation	NIBRS national estimates by state, region, agency type, or population size

Specialized Crime Data

Tool	Description
get_hate_crime_data	Hate crime incidents by bias motivation (30+ categories)
get_expanded_homicide_data	Supplementary Homicide Reports — victim/offender demographics, weapons, circumstances
get_expanded_property_data	Expanded property crime details — stolen/recovered values for burglary, larceny, motor vehicle theft (MVT), robbery

Law Enforcement Data

Tool	Description
get_police_employment	Officer and civilian employee counts by gender, rates per 1,000 population
get_leoka_data	Officers killed and assaulted — weapons, circumstances, demographics
get_lesdc_data	Law enforcement suicide data — demographics, race, duty status, and more
get_use_of_force_data	Use of force incidents resulting in death, serious injury, or firearm discharge

Overview

Tool	Description
get_cde_homepage_summary	CDE homepage summary — mission statement, navigation, data freshness, date ranges, and national crime trends

Reference & Lookup

Tool	Description
lookup_agency	Find law enforcement agencies by state, ORI code, or judicial district
get_reference_data	State lists, offense/bias code lookups, data refresh dates
manage_cache	View cache stats, clear all entries, or clear only expired entries
read_spillover	Read spillover files saved when tool responses exceed the size limit

Large Responses

When a tool response exceeds 128,000 characters, the full result is saved to ~/.cache/fbi-crime-data-mcp/spillover/ and a truncated preview is returned with the file path. To avoid this, narrow your query (shorter date range, specific state/agency).

Data Sources

All data comes from the FBI's Crime Data Explorer API, which provides Uniform Crime Reporting (UCR) data including both the Summary Reporting System (SRS) and the National Incident-Based Reporting System (NIBRS).

API Rate Limits

• Registered key: 1,000 requests per hour (rolling window)
• DEMO_KEY: 30 requests per IP per hour

The server includes a built-in rate limiter (1,000 req/hr). The DEMO_KEY limit is enforced API-side.

Development

# Install dependencies
uv sync

# Run the server locally
FBI_API_KEY=your-key uv run fbi-crime-data-mcp

# Run tests
uv run pytest

License

MIT