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Tools

12 tools defined. 4 are active via the FBI CDE API; 8 are decommissioned — the legacy UCR backend (crime-data-api.fr.cloud.gov) was shut down, and those tools return a ServiceUnavailable error on every call with guidance to the FBI CDE website.

Active tools (CDE API)

Tool	Description
fbi_get_crime_estimates	Monthly offense rates (per 100k) and raw counts from the FBI CDE summarized endpoint. National, state, or agency scope. Covers violent-crime, property-crime, robbery, burglary, larceny, motor-vehicle-theft, arson, aggravated-assault, rape, homicide.
fbi_get_agency_offenses	Same CDE summarized endpoint, scoped to a single agency by ORI code. Returns month-by-month rates and counts for that agency.
fbi_get_leoka	Law Enforcement Officers Killed and Assaulted (LEOKA) — fatality and assault counts with circumstance and weapon detail, by month or year-to-date.
fbi_get_arson	Redirects to fbi_get_crime_estimates with offense="arson" — arson data is available via the CDE summarized endpoint.

Decommissioned tools (always return error)

Tool	Status
fbi_search_agencies	UCR agency search backend decommissioned
fbi_get_agency	UCR agency lookup backend decommissioned
fbi_get_arrests	UCR arrests backend decommissioned
fbi_get_hate_crimes	UCR hate crimes backend decommissioned
fbi_get_participation	UCR participation backend decommissioned
fbi_get_human_trafficking	UCR human trafficking backend decommissioned
fbi_get_nibrs_breakdown	NIBRS backend decommissioned
fbi_list_code_table	UCR code table backend decommissioned

For decommissioned data, consult cde.ucr.cjis.gov or download FBI bulk CSV files.

fbi_get_crime_estimates

Monthly offense rates and raw counts from the FBI CDE summarized endpoint.

• Scope: national, state (requires state_abbr), or agency (requires ORI)
• Offense types: violent-crime, property-crime, robbery, burglary, larceny, motor-vehicle-theft, arson, aggravated-assault, rape, homicide
• Returns per-100k rates and raw actuals by month for the requested date range

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fbi_get_agency_offenses

Same CDE summarized endpoint scoped to a single agency, state, or national level.

• Functionally equivalent to fbi_get_crime_estimates with scope="agency" — useful when the agent's mental model is "offenses for this agency" rather than "crime trends"
• Provide ORI for agency scope; state_abbr for state scope

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fbi_get_leoka

Law Enforcement Officers Killed and Assaulted (LEOKA) data.

• Two period modes: monthly (by month) or ytd (year-to-date)
• Returns feloniously killed, accidentally killed, and assault counts with circumstance and weapon detail

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fbi_get_arson

Redirects to fbi_get_crime_estimates with offense="arson". The dedicated UCR arson endpoint is decommissioned; arson data remains available via the CDE summarized endpoint.

Resources

Type	Name	Description
Resource	fbi://agency/{ori}	[UNAVAILABLE] The UCR agency profile backend has been decommissioned; reading this resource returns a ServiceUnavailable error.
Resource	fbi://state/{state_abbr}	[UNAVAILABLE] The CDE state participation backend has been decommissioned; reading this resource returns a ServiceUnavailable error.

Features

Built on @cyanheads/mcp-ts-core:

• Declarative tool and resource definitions — single file per primitive, framework handles registration and validation
• Unified error handling — handlers throw, framework catches, classifies, and formats
• Pluggable auth: none, jwt, oauth
• Swappable storage backends: in-memory, filesystem, Supabase, Cloudflare KV/R2/D1
• Structured logging with optional OpenTelemetry tracing
• STDIO and Streamable HTTP transports

FBI Crime Data Explorer-specific:

• CDE API (/cde/summarized/, /cde/leoka/) — the surviving FBI endpoints post-UCR decommission
• Decommissioned tools return a ServiceUnavailable error with a recovery hint pointing to cde.ucr.cjis.gov — agents can report the gap rather than silently failing
• DEMO_KEY mode for no-config exploration; registered api.data.gov key for production throughput

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 v1.3.2 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:

Variable	Description	Default
FBI_API_KEY	Required. api.data.gov API key for the FBI CDE API. Use DEMO_KEY for limited testing.	—
FBI_API_BASE_UCR	Override UCR base URL.	https://api.usa.gov/crime/fbi/ucr
FBI_API_BASE_CDE	Override CDE base URL.	https://api.usa.gov/crime/fbi/cde
FBI_REQUEST_TIMEOUT_MS	Per-request timeout in milliseconds.	15000
MCP_TRANSPORT_TYPE	Transport: stdio or http.	stdio
MCP_HTTP_PORT	Port for HTTP server.	3010
MCP_HTTP_ENDPOINT_PATH	HTTP endpoint path.	/mcp
MCP_PUBLIC_URL	Public origin override for TLS-terminating reverse-proxy deployments.	none
MCP_AUTH_MODE	Auth mode: none, jwt, or oauth.	none
MCP_LOG_LEVEL	Log level (RFC 5424).	info
MCP_GC_PRESSURE_INTERVAL_MS	Opt-in Bun-only forced-GC pressure interval (ms). Try 60000 if RSS grows under sustained HTTP load.	0
LOGS_DIR	Directory for log files (Node.js only).	<project-root>/logs
STORAGE_PROVIDER_TYPE	Storage backend: in-memory, filesystem, supabase, cloudflare-kv/r2/d1.	in-memory
OTEL_ENABLED	Enable OpenTelemetry instrumentation.	false

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

Running the server

Local development

• Build and run:

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

• Run checks and tests:

  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

Directory	Purpose
src/index.ts	createApp() entry point — registers tools, resources, and inits services.
src/config	Server-specific environment variable parsing and validation with Zod.
src/mcp-server/tools	Tool definitions (*.tool.ts). 12 tools — 4 active via CDE API, 8 decommissioned.
src/mcp-server/resources	Resource definitions (*.resource.ts). Agency and state overview resources.
src/services	FBI API service layer — UCR and CDE clients with shared retry/timeout logic.
tests/	Unit and integration tests mirroring src/.

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 via the barrels in src/mcp-server/*/definitions/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 and pull requests are welcome. Run checks and tests before submitting:

bun run devcheck
bun run test

License

Apache-2.0 — see LICENSE for details.