Overview

FBI Crime Data Explorer (CDE) data — monthly UCR offense rates and counts by national, state, or agency scope, plus Law Enforcement Officers Killed and Assaulted (LEOKA) statistics. Query crime trends and officer-safety data from any MCP client; the CDE's legacy UCR endpoints (agency search, NIBRS breakdowns, hate crimes, arrests, human trafficking, participation) have been decommissioned by the FBI, and their tools and resources return an error. Runs as a stdio process or a local Streamable HTTP server.

Tools

Resources

Capability reference

fbi_get_crime_estimates _tool

• scope: national, state (requires two-letter state_abbr), or agency (requires nine-character ori); offense: violent-crime, property-crime, robbery, burglary, larceny, motor-vehicle-theft, arson, aggravated-assault, rape, or homicide. Set from_year/from_month through to_year/to_month (2000–2030; months default to January and December).
• Returns per-100k rates and raw actual/clearance counts by month, plus data_last_updated when the CDE reports a refresh date
• Typed errors: scope_param_missing (missing state_abbr/ori for the chosen scope), no_data

fbi_get_agency_offenses _tool

• Same CDE summarized endpoint as fbi_get_crime_estimates, scoped by scope: national, state (state_abbr), or agency (ori)
• Same offense enum and from_year/from_month/to_year/to_month range (years 2000–2030)
• Typed errors: scope_param_missing, no_data

fbi_get_leoka _tool

• period: ytd (year-to-date) or monthly (requires month, 1–12); year is required (2000–2030)
• totals preserves the six fields from incidents_victim_officer_totals_ytd: total_officers, total_incidents, total_officers_dod, total_officers_doi, total_incidents_dod, and total_incidents_doi. This CDE YTD block appears in both periods; it is not a combined-fatality count or a requested-month total. The upstream dod/doi abbreviations have unspecified interpretation.
• Totals field migration: replace total_officers_felonious with total_officers_dod, total_officers_accidental with total_officers_doi, total_incidents_felonious with total_incidents_dod, and total_incidents_accidental with total_incidents_doi. The four aliases are removed; values are unchanged.
• Category-to-count maps: weapons, officer_activity, lighting_conditions, body_armor_worn, location_of_attack, offender_previously_known_to_agency, offender_prior_mental_illness, offender_prior_relationship, officer_circumstances_time_of_attack, officer_incident_type, officer_type_of_assignment, and weather_conditions.
• offender_demographic and officer_demographic map demographic dimensions to category counts. officer_death_by_time_of_day maps killing types to literal hour keys (including -1); officer_death_by_month maps killing types to years to month counts, retaining comparison years and zeros.
• deaths_by_region and optional deaths_by_year retain explicitly classified killing types such as Felonious/Accidental. Monthly responses omit the annual series and provide month-specific breakdowns alongside the separate CDE YTD totals block.
• Structured and text output include every returned category and path. Absent/null sections are omitted, empty maps have no reported entries, null subgroups/counts are unavailable, and zero remains zero.
• Typed errors: month_required (monthly period without month), no_data

fbi_get_arson _tool

• Always throws ServiceUnavailable — the dedicated UCR arson endpoint is decommissioned
• Recovery hint redirects to fbi_get_crime_estimates with offense="arson", which serves arson data via the CDE summarized endpoint
• Input fields (scope, state_abbr, since_year, until_year) are accepted but unused

fbi_search_agencies _tool

• Always throws ServiceUnavailable — the UCR agency search backend (crime-data-api.fr.cloud.gov) is decommissioned
• Recovery hint points to cde.ucr.cjis.gov or the FBI UCR program
• Input fields (state_abbr, agency_type, city, population_group, page, per_page) are accepted but unused

fbi_get_agency _tool

• Always throws ServiceUnavailable — the UCR agency profile backend is decommissioned, with no CDE replacement identified
• Recovery hint points to cde.ucr.cjis.gov
• ori input is accepted but unused

fbi_get_arrests _tool

• Always throws ServiceUnavailable — the UCR arrests backend is decommissioned
• Recovery hint points to cde.ucr.cjis.gov or FBI bulk CSV downloads
• since_year/until_year inputs are accepted but unused

fbi_get_hate_crimes _tool

• Always throws ServiceUnavailable — the UCR hate crimes backend is decommissioned
• Recovery hint points to cde.ucr.cjis.gov
• Input fields (scope, state_abbr, since_year, until_year, cross_offense) are accepted but unused

fbi_get_human_trafficking _tool

• Always throws ServiceUnavailable — the UCR human trafficking backend is decommissioned
• Recovery hint points to cde.ucr.cjis.gov
• Input fields (scope, state_abbr, ori, since_year, until_year) are accepted but unused

fbi_get_nibrs_breakdown _tool

• Always throws ServiceUnavailable — the UCR NIBRS breakdown backend is decommissioned
• Recovery hint points to cde.ucr.cjis.gov
• Input fields (dimension, variable, scope, state_abbr, offense_name, since_year, until_year) are accepted but unused

fbi_get_participation _tool

• Always throws ServiceUnavailable — both the UCR legacy backend and the CDE /LATEST/participation/ path are decommissioned (404)
• Recovery hint points to cde.ucr.cjis.gov
• Input fields (scope, state_abbr, year, nibrs_only, page, per_page) are accepted but unused

fbi_list_code_table _tool

• Always throws ServiceUnavailable — the UCR code table backend is decommissioned
• Recovery hint points to cde.ucr.cjis.gov
• table input (one of 10 code-table names) is accepted but unused

fbi://agency/{ori} _resource

• Always throws ServiceUnavailable on read — the UCR agency profile backend is decommissioned
• ori is the 9-character ORI (Originating Agency Identifier) code

fbi://state/{state_abbr} _resource

• Always throws ServiceUnavailable on read — the CDE /LATEST/participation/state/ path returns 404
• state_abbr is the two-letter US state abbreviation

Features

Built on @cyanheads/mcp-ts-core: stdio and Streamable HTTP transports, pluggable auth (none / jwt / oauth), swappable storage (in-memory, filesystem, Supabase, Cloudflare KV/R2/D1), structured logging with optional OpenTelemetry tracing.

FBI CDE-specific:

• CDE summarized endpoint (/cde/summarized/) for national, state, and per-agency offense rates and counts across 10 offense types
• CDE LEOKA endpoint (/cde/leoka/) for officer fatality, weapon, and circumstance data by month or year-to-date
• DEMO_KEY works without registration (shared, rate-limited pool); a registered api.data.gov key raises throughput
• 9 of 12 tools and both resources return a ServiceUnavailable error — the legacy UCR backend (crime-data-api.fr.cloud.gov) was decommissioned; fbi_get_arson redirects callers to fbi_get_crime_estimates

Agent-friendly output:

• Typed error reasons (scope_param_missing, no_data, month_required, endpoint_decommissioned) each carry a recovery hint naming the next step or the cde.ucr.cjis.gov replacement
• Sparse upstream fields surface as null rather than fabricated zeros, on the rate, clearance, and count fields of fbi_get_crime_estimates and fbi_get_agency_offenses
• data_last_updated echoes the CDE's own refresh timestamp so agents can reason about freshness

Getting started

Add the following to your MCP client configuration file. See the FBI CDE API key registration to obtain a key — DEMO_KEY works for exploration but is rate-limited.

{
  "mcpServers": {
    "fbi-crime-mcp-server": {
      "type": "stdio",
      "command": "bunx",
      "args": ["@cyanheads/fbi-crime-mcp-server@latest"],
      "env": {
        "MCP_TRANSPORT_TYPE": "stdio",
        "MCP_LOG_LEVEL": "info",
        "FBI_API_KEY": "your-api-key"
      }
    }
  }
}

Or with npx (no Bun required):

{
  "mcpServers": {
    "fbi-crime-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@cyanheads/fbi-crime-mcp-server@latest"],
      "env": {
        "MCP_TRANSPORT_TYPE": "stdio",
        "MCP_LOG_LEVEL": "info",
        "FBI_API_KEY": "your-api-key"
      }
    }
  }
}

Or with Docker:

{
  "mcpServers": {
    "fbi-crime-mcp-server": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run", "-i", "--rm",
        "-e", "MCP_TRANSPORT_TYPE=stdio",
        "-e", "FBI_API_KEY=your-api-key",
        "ghcr.io/cyanheads/fbi-crime-mcp-server:latest"
      ]
    }
  }
}

For Streamable HTTP, set the transport and start the server:

MCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 FBI_API_KEY=... bun run start:http
# Server listens at http://localhost:3010/mcp

Prerequisites

• Bun v1.4.0 or higher (or Node.js v24+).
• An api.data.gov API key for the FBI CDE API. DEMO_KEY works for testing but is rate-limited to ~1,000 req/hr from a shared pool.

Installation

1. Clone the repository:

git clone https://github.com/cyanheads/fbi-crime-mcp-server.git

2. Navigate into the directory:

cd fbi-crime-mcp-server

3. Install dependencies:

bun install

4. Configure environment:

cp .env.example .env
# edit .env and set FBI_API_KEY

Configuration

All configuration is validated at startup via Zod schemas in src/config/server-config.ts. Key environment variables:

See .env.example for the full list of optional overrides.

Running the server

Local development

• Build and run:

  sh

  # One-time build
  bun run rebuild
  
  # Run the built server
  bun run start:stdio
  # or
  bun run start:http
  

• Run checks and tests:

  sh

  bun run devcheck   # Lint, format, typecheck, security
  bun run test       # Vitest test suite
  bun run lint:mcp   # Validate MCP definitions against spec
  

Docker

docker build -t fbi-crime-mcp-server .
docker run --rm -e FBI_API_KEY=your-key -p 3010:3010 fbi-crime-mcp-server

The Dockerfile defaults to HTTP transport, stateless session mode, and logs to /var/log/fbi-crime-mcp-server. OpenTelemetry peer dependencies are installed by default — build with --build-arg OTEL_ENABLED=false to omit them.

Project structure

Development guide

See CLAUDE.md for development guidelines and architectural rules. The short version:

• Handlers throw, framework catches — no try/catch in tool logic
• Use ctx.log for request-scoped logging, ctx.state for tenant-scoped storage
• Register new tools and resources in the arrays passed to createApp() in src/index.ts
• Active tools call the CDE API (/cde/summarized/, /cde/leoka/); decommissioned tools throw serviceUnavailable with a recovery hint
• Wrap FBI API calls: validate raw → normalize to domain type → return output schema; never fabricate missing fields

Contributing

Issues are welcome. Run checks and tests before submitting:

bun run devcheck
bun run test

License

Apache-2.0 — see LICENSE for details.