@Cyanheads/Faostat Server

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Overview

Global food and agriculture statistics from the UN FAOSTAT bulk-download corpus — crop and livestock production, agricultural trade, food balances, food security and nutrition, land use, fertilizer use, and agrifood-systems emissions for 245+ countries and territories from 1961 to the present. Discover a domain, resolve area/item/element codes, then query the cube; large or merged result sets spill to a DataCanvas SQL surface for GROUP BY, ranking, and time-series analysis. Runs as a stdio process, a local Streamable HTTP server, or the public hosted endpoint above.

Tools

Tool	Description
faostat_list_domains	Discover FAOSTAT statistical domains with codes, descriptions, last-update date, upstream row count, and local index status. The entry point — every query keys on a domain code.
faostat_resolve_codes	Resolve human terms to the opaque integer codes a query needs (areas, items, elements), flagging each area as a country or an aggregate region.
faostat_query_observations	Query a domain's cube by area(s), item(s), element(s), and year range. Inline preview for small results; large sets spill to a DataCanvas table.
faostat_commodity_profile	Workflow: assemble top producers, the production trend, and trade flows for one commodity from the production and trade domains in a single call.
faostat_dataframe_query	Run a read-only SQL SELECT against the canvas tables staged by the analytical tools.
faostat_dataframe_describe	List the canvas tables staged this session, each with provenance, row count, and column schema.

Capability reference

faostat_list_domains _tool

• Full FAOSTAT catalog (~69 domains) read live from the bulk manifest, annotated with local mirror status
• code for an exact domain lookup; topic substring filter over code/name/topic; indexed_only to list only domains queryable from the local mirror
• offset + limit (max 200, default 20) page the catalog — response reports totalMatches, truncated, and nextOffset
• Each entry reports indexed / index_ready flags, local row count, and last completed sync

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faostat_resolve_codes _tool

• FTS5 full-text query, substring name_contains, or exact code lookup within a dimension: area, item, or element
• Item/element matches are scoped to codes present in the given domain's cube; area codes are shared across domains
• Every area match is flagged country or aggregate (codes ≥ 5000, plus curated sub-threshold roll-ups such as China=351)
• limit (max 200, default 50) + offset page the match set
• Typed errors: unknown_domain, index_not_ready

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faostat_query_observations _tool

• Filters by area_codes / item_codes / element_codes and an inclusive year_start / year_end range
• Aggregate regions excluded by default (include_aggregates: false); explicit area_codes bypass the exclusion
• limit caps the inline page (default 200, max 1000); a match that exceeds it spills in full to a DataCanvas table (50,000-row staging cap) for SQL via faostat_dataframe_query
• Every row carries its data-quality flag (A/E/I/B/M/T/X, others per domain) — never dropped
• Typed errors: domain_not_indexed, index_not_ready, canvas_disabled, invalid_year_range

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faostat_commodity_profile _tool

• Resolves item_query to up to 5 item codes, then ranks top producers/exporters/importers and returns an annual production trend in one call
• Rankings are per-country sums grouped by unit, each country at its own latest reporting year; countries only (aggregates excluded)
• Returns a partial, production-only profile with a notice — rather than failing — when the trade domain (TCL) isn't indexed or still syncing
• top_n caps each ranked list (max 50); the merged observation set spills to a DataCanvas table for further SQL
• Typed errors: no_match, index_not_ready, invalid_year_range

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faostat_dataframe_query _tool

• Single-statement read-only SELECT over staged faostat_xxxxxxxx tables — joins, aggregates, window functions, and CTEs all work
• Writes, DDL, DROP, COPY, PRAGMA, ATTACH, external-file functions, and system catalogs (information_schema, sqlite_master, duckdb_*) are rejected
• row_limit caps the response (default 1000, max 10000); truncated means more rows exist, with no exact total computed on this path
• Typed errors: canvas_disabled, canvas_not_found, missing_table, system_catalog_access, invalid_sql

---

faostat_dataframe_describe _tool

• Lists staged tables with source tool, query params, row count, column schema, and creation/expiry (2-hour sliding TTL)
• name describes one table outright; otherwise offset + limit (max 100, default 20) page the listing newest-first
• Typed errors: canvas_disabled, canvas_not_found, missing_table

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.

FAOSTAT-specific:

• Persistent local SQLite mirror of the FAOSTAT bulk corpus via the framework MirrorService, with FTS5 over the dimension labels driving code resolution
• Streaming bulk-ZIP ingester — skips domains whose upstream update date hasn't advanced, and stream-parses the normalized CSV into SQLite without materializing the full file in memory
• Config-driven domain selection (FAOSTAT_DOMAINS) — the indexed set can grow without code changes, and the full catalog stays browsable regardless
• DataCanvas SQL surface (DuckDB) for GROUP BY, ranking, and time-series analysis over spilled result sets

Agent-friendly output:

• Country-vs-aggregate classification on every area, with aggregates excluded from sums by default — guards against double-counting World/continent rows with their member countries
• Data-quality provenance — every observation carries its FAOSTAT flag (A/E/I/B/M/T/X, others per domain), never dropped from output
• Graceful partial results — faostat_commodity_profile returns a production-only profile with a notice, rather than failing, when the trade domain isn't indexed
• Typed error contracts — index_not_ready, domain_not_indexed, canvas_disabled, and others each carry a concrete recovery hint

Getting started

Public Hosted Instance

A public instance is available at https://faostat.caseyjhand.com/mcp — no installation required. Point any MCP client at it via Streamable HTTP:

{
  "mcpServers": {
    "faostat-mcp-server": {
      "type": "streamable-http",
      "url": "https://faostat.caseyjhand.com/mcp"
    }
  }
}

Self-Hosted / Local

Add the following to your MCP client configuration file. The server runs entirely on a local mirror, so build the mirror once before querying.

{
  "mcpServers": {
    "faostat-mcp-server": {
      "type": "stdio",
      "command": "bunx",
      "args": ["@cyanheads/faostat-mcp-server@latest"],
      "env": {
        "MCP_TRANSPORT_TYPE": "stdio",
        "MCP_LOG_LEVEL": "info"
      }
    }
  }
}

Or with npx (no Bun required):

{
  "mcpServers": {
    "faostat-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@cyanheads/faostat-mcp-server@latest"],
      "env": {
        "MCP_TRANSPORT_TYPE": "stdio",
        "MCP_LOG_LEVEL": "info"
      }
    }
  }
}

Or with Docker:

{
  "mcpServers": {
    "faostat-mcp-server": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run", "-i", "--rm",
        "-e", "MCP_TRANSPORT_TYPE=stdio",
        "-v", "faostat-mirror:/usr/src/app/.faostat-mirror",
        "ghcr.io/cyanheads/faostat-mcp-server:latest"
      ]
    }
  }
}

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

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

No API key is required — the FAOSTAT bulk-download service is public and keyless.

Prerequisites

• Bun v1.3.0 or higher (or Node.js v24+).
• Disk for the local mirror. The default domain set (QCL,TCL,FBS,FS,RL,GLE,RFN,QV, ∼37M rows) needs a few GB; TCL (∼17M rows) dominates and can be dropped from FAOSTAT_DOMAINS on a constrained host.

Installation

1. Clone the repository:

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

2. Navigate into the directory:

cd faostat-mcp-server

3. Install dependencies:

bun install

4. Configure environment:

cp .env.example .env
# edit .env to override the default domain set, mirror path, or refresh cron

Building the mirror

The corpus is not bundled. Before the data tools can answer queries, sync the selected domains into the local mirror:

bun run mirror:init      # one-time bootstrap — downloads and indexes the FAOSTAT_DOMAINS set
bun run mirror:refresh   # re-sync domains whose upstream update date has advanced
bun run mirror:verify    # report sync status, local row counts, and sample reads

mirror:init is idempotent and resumable per domain — re-running after an interrupt re-streams only the unfinished domain ZIP. FAOSTAT_DOMAINS selects which domains are indexed; everything else in the catalog shows in faostat_list_domains with indexed: false until added and re-synced. On HTTP transport, set FAOSTAT_REFRESH_CRON to refresh in-process on a schedule; on stdio, run mirror:refresh out-of-band. The read tools return index_not_ready until the first sync completes.

Configuration

Variable	Description	Default
FAOSTAT_DOMAINS	Comma-separated FAOSTAT domain codes to index into the local mirror. Domains outside this set appear in faostat_list_domains but are not queryable until added and re-synced.	QCL,TCL,FBS,FS,RL,GLE,RFN,QV
FAOSTAT_MIRROR_PATH	Directory holding the per-domain SQLite stores and the shared dimension database. Created if absent.	./.faostat-mirror
FAOSTAT_BULK_BASE_URL	FAOSTAT bulk-download service base URL (manifest + per-domain ZIPs).	https://bulks-faostat.fao.org/production
FAOSTAT_REFRESH_CRON	Cron for the in-process incremental refresh (HTTP transport only). Omit to disable and run mirror:refresh out-of-band.	—
CANVAS_PROVIDER_TYPE	DataCanvas engine. duckdb enables the SQL surface; set none to disable analytical staging (the dataframe_* tools then report canvas_disabled and large queries refuse to spill).	duckdb
MCP_TRANSPORT_TYPE	Transport: stdio or http.	stdio
MCP_SESSION_MODE	HTTP session mode: stateless, stateful, or auto (resolves to stateful). The server declares stateless in src/index.ts — no tool asks the caller for input mid-handler — and setting this overrides that declaration.	stateless
MCP_HTTP_PORT	Port for the HTTP server.	3010
MCP_AUTH_MODE	Auth mode: none, jwt, or oauth.	none
MCP_LOG_LEVEL	Log level (RFC 5424).	info
LOGS_DIR	Directory for log files (Node.js only).	<project-root>/logs

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 faostat-mcp-server .
docker run --rm -p 3010:3010 -v faostat-mirror:/usr/src/app/.faostat-mirror faostat-mcp-server

The Dockerfile defaults to HTTP transport, stateless session mode, and logs to /var/log/faostat-mcp-server. The build stage compiles the native dependencies (@duckdb/node-api, better-sqlite3) and the production stage reuses the prebuilt node_modules, so the slim runtime image carries no build toolchain. OpenTelemetry peer dependencies are installed by default — build with --build-arg OTEL_ENABLED=false to omit them. Mount a volume at the mirror path to persist the corpus across container recreations, and bootstrap it inside the container:

docker exec <container> bun run mirror:init      # one-time bootstrap
docker exec <container> bun run mirror:verify    # sync status + sample reads
docker exec <container> bun run mirror:refresh   # re-sync when FAO has updated a domain

Project structure

Directory	Purpose
src/index.ts	createApp() entry point — registers the six tools, wires the mirror and canvas in setup(), schedules the HTTP refresh.
src/config	Server-specific environment variable parsing and validation with Zod.
src/mcp-server/tools/definitions	Tool definitions (*.tool.ts).
src/services/faostat-mirror	The bulk-download mirror service — manifest discovery, streaming ZIP ingester, CSV parsing, dimension store, SQLite-backed MirrorService wiring.
src/services/canvas-accessor.ts, canvas-staging.ts	DataCanvas accessor and the spill/query/describe staging layer.
scripts/faostat-mirror-*.ts	mirror:init / mirror:refresh / mirror:verify CLIs.
tests/	Unit and integration tests mirroring src/.

Development guide

See CLAUDE.md/AGENTS.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 in the createApp() array in src/index.ts
• Wrap external data: validate raw → normalize to domain type → return output schema; never fabricate missing fields, and carry the data-quality flag through

Data attribution

Data is sourced from FAOSTAT, the statistics division of the Food and Agriculture Organization of the United Nations (FAO). FAOSTAT data is published under CC BY-4.0; cite FAO as the source in downstream use. This project is not affiliated with or endorsed by the FAO.

Contributing

Issues are welcome. Run checks and tests before submitting:

bun run devcheck
bun run test

License

Apache-2.0 — see LICENSE for details.