Geo Worker

Geo MCP Server — Geospatial computation for AI agents.

Deployed on Cloudflare Workers. Powered by Nominatim / Overpass / OSRM. Free, no API key, stateless. English | 中文

Tools

Tool	Description	Source
geo_geocode	Address text → lat/lon coordinates	Nominatim (OSM)
geo_reverse	Lat/lon → address text	Nominatim (OSM)
geo_find_poi	Nearby POI search (20+ categories)	Overpass API (OSM)
geo_route	Point-to-point distance & duration (driving/walking/cycling)	OSRM

Protocol

MCP (JSON-RPC 2.0), compatible with search-mcp-worker.

• POST /mcp — MCP endpoint
• GET /health — Health check

Quick Start

Initialize

POST /mcp
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "initialize",
  "params": {
    "protocolVersion": "2025-03-26",
    "capabilities": {},
    "clientInfo": { "name": "my-agent", "version": "1.0" }
  }
}

List tools

{ "jsonrpc": "2.0", "id": 2, "method": "tools/list" }

Live API Examples

1. Geocode (geo_geocode)

Request:

{
  "jsonrpc": "2.0", "id": 1,
  "method": "tools/call",
  "params": {
    "name": "geo_geocode",
    "arguments": { "address": "上海市徐汇区云锦路", "limit": 1 }
  }
}

Response:

{
  "ok": true,
  "query": "上海市徐汇区云锦路",
  "results": [
    {
      "lat": 31.169501,
      "lon": 121.453866,
      "display_name": "云锦路, 龙华, 龙华街道, 徐汇区, 上海市, 200232, 中国",
      "type": "residential",
      "importance": 0.42
    }
  ]
}

School names work too:

{ "address": "向明中学浦江校区" }
→ lat=31.075575, lon=121.496283
→ "向明中学（浦江校区）, 浦锦路, 浦锦街道, 勤俭, 闵行区, 上海市, 201112, 中国"

⚠️ Does not accept company/brand names (e.g. "中电金信"). For such queries, use search-mcp first to get the street address, then pass it to geo_geocode.

2. Reverse Geocode (geo_reverse)

Request:

{
  "name": "geo_reverse",
  "arguments": { "lat": 31.169501, "lon": 121.453866 }
}

Response:

{
  "ok": true,
  "display_name": "云锦路, 龙华, 龙华街道, 徐汇区, 上海市, 200232, 中国",
  "address": {
    "road": "云锦路",
    "suburb": "龙华街道",
    "city": "徐汇区",
    "state": "上海市",
    "postcode": "200232",
    "country": "中国"
  }
}

3. Find Nearby POIs (geo_find_poi)

Subway stations:

{
  "name": "geo_find_poi",
  "arguments": {
    "lat": 31.169501, "lon": 121.453866,
    "category": "subway", "radius_m": 1000, "limit": 5
  }
}

Response:

{
  "ok": true,
  "count": 4,
  "results": [
    { "name": "云锦路",   "distance_m": 0,   "category": "subway" },
    { "name": "龙华",     "distance_m": 772, "category": "subway" },
    { "name": "龙耀路",   "distance_m": 897, "category": "subway" },
    { "name": "龙华",     "distance_m": 962, "category": "subway" }
  ]
}

Restaurants:

{ "lat": 31.240168, "lon": 121.497945, "category": "restaurant", "radius_m": 500 }

Yang's Dumplings — 223m
Morton's Grille — 319m | steak_house
Win House — 387m
Hooters — 457m | burger

Supported POI categories: restaurant, cafe, school, hospital, clinic, pharmacy, bank, atm, supermarket, convenience, subway, bus_stop, park, gym, cinema, library, kindergarten, police, fire_station, post_office, parking, fuel, marketplace

4. Route Planning (geo_route)

Driving:

{
  "name": "geo_route",
  "arguments": {
    "from": { "lat": 31.169501, "lon": 121.453866 },
    "to":   { "lat": 31.240168, "lon": 121.497945 },
    "mode": "driving"
  }
}

distance=12609m (12.6km)  duration=14.7min  confidence=high

Walking (auto-calibrated for long distances):

{
  "from": { "lat": 31.075575, "lon": 121.496283 },
  "to":   { "lat": 31.127125, "lon": 121.489319 },
  "mode": "walking"
}

distance=7352m (7.4km)  duration=91.9min  confidence=low

For walking distances >2km, duration is recalculated at 80m/min (~4.8km/h) and flagged as confidence=low.

5. Health Check

GET /health
{
  "ok": true,
  "name": "geo-mcp-worker",
  "version": "1.0.0",
  "tools": ["geo_geocode", "geo_reverse", "geo_find_poi", "geo_route"],
  "data_sources": ["nominatim", "overpass", "osrm"]
}

Search MCP Integration

Geo MCP handles spatial computation only. For semantic search, combine with search-mcp-worker:

User: "What subway stations are near 中电金信 Shanghai HQ?"

1. search_mcp("中电金信上海总部地址") → "上海市徐汇区云锦路XXX号"
2. geo_geocode("上海市徐汇区云锦路") → { lat: 31.17, lon: 121.45 }
3. geo_find_poi(lat, lon, category="subway", radius_m=1000) → 云锦路(0m), 龙华(772m)
4. geo_route(from=office, to=云锦路, mode="walking") → 3min walk

Design Constraints

• Stateless: No CF KV. All data fetched from upstream APIs in real-time.
• Zero auth: All upstream APIs are free and require no API key.
• Coordinate precision: All coordinates truncated to 6 decimal places via toFixed(6).
• Walking calibration: OSRM walking durations >2km are recalculated at 80m/min.
• Semantic errors: { ok: false, reason: "poi_not_found", message: "..." } — agents can decide whether to retry with a larger radius or abort.

Deployment

# Upload via CF API
curl -X PUT \
  "https://api.cloudflare.com/client/v4/accounts/<ACCOUNT_ID>/workers/scripts/geo-mcp-worker" \
  -H "X-Auth-Email: <EMAIL>" \
  -H "X-Auth-Key: <API_KEY>" \
  -F "metadata=@/tmp/metadata.json;type=application/json" \
  -F "index.js=@src/index.js;type=application/javascript+module"

metadata.json:

{ "main_module": "index.js", "compatibility_date": "2026-04-08" }

Expansion Roadmap

See GEO_TRANSIT_RESEARCH_REPORT.txt for the full survey of 28 projects.

Layer	Solution	Coverage	Status
Layer 0	OSRM + Nominatim + Overpass	Global driving/walking/POI	✅ Deployed
Layer 1	Transitous	International public transit	📋 Researched
Layer 2	Amap (高德) API	China public transit	📋 Researched

License

This project is licensed under the GNU General Public License v3.0 — see the LICENSE file for details.