🌍 bbox-mcp-server

Ask AI about anything, anywhere — and verify the answer on a map. For Free

The geospatial toolkit for AI agents. 6 tools, zero config — give any LLM the ability to find, query, convert, and aggregate spatial data using open data. No API keys or signups required to start.

Every response includes a shareable verification link to vibhorsingh.com/boundingbox — click it to visually confirm results on an interactive map. No other MCP server does this.

What Can You Do With This?

You don't have to be a GIS professional to make use of this. Any AI agent with this MCP server can answer spatial questions using real OpenStreetMap data and not spit out hallucinated garbage.

Ask your AI agent...	What happens under the hood
"How many EV chargers are in downtown Denver?"	Overpass query → H3 hex binning → density analysis
"Is there a hospital near this Airbnb?"	POI search with structured tags → map verification link
"Find all playgrounds within 1km of this address"*	Overpass query + radius filter → pinned results on a shareable map
"Convert this WKT to GeoJSON in EPSG:3857"	Format conversion across 6 inputs, 9 outputs, 3,900+ projections
"Show me all bike-share stations in Amsterdam"	Curated OSM tags → Overpass query → results on map
"Compare park density across Seattle neighborhoods"	Overpass + H3 aggregation → hex-binned spatial analysis

Every answer comes with a link. Click it, see if the AI got it right and you can also share it with someone else.

What Makes This Different

Most AI tools give you text you have to trust. This one gives you an interactive map you can check and verify!

Verifiable — Every response includes a public URL where you (or anyone) can visually confirm the results. This is the only MCP server that does this in any domain.
Deterministic — Queries hit real OpenStreetMap data and return real coordinates. The AI interprets your question. The data comes from all the hard work done by all the awesome OSM volunteers.
Free — No paid services. Overpass API is free, OSM data is free, the tool is free. A Mapbox token (free tier, no payment info) unlocks natural language location search but isn't required.
Zero config — npx -y bbox-mcp-server and you're running.

Why This Exists

The problem	How bbox-mcp solves it
"I have WKT but the API needs a GeoJSON bbox in EPSG:3857."	Parses 6 input formats, projects to 3,900+ EPSG codes, outputs in 9 formats — in one call.
"I keep getting the wrong OSM tags for Overpass queries."	`list_osm_tags` returns curated tag combos. No more hallucinated `amenity=grocery`.
"How many hospitals are in this district?"	`aggregate_overpass_h3` queries Overpass and bins results into H3 hexagons server-side.
"Is this bounding box actually correct?"	Every response includes a clickable map link for visual verification.

Tools at a Glance

Tool	What it does	Key params
`get_bounds`	Convert and project a bbox across formats and coordinate systems	`bbox`, `epsg`, `format`, `coord_order`, `zoom`
`get_h3_indices`	Generate H3 hex cell indices covering a bbox	`bbox`, `resolution`, `compact`
`generate_share_url`	Create a shareable map link for a bbox	`bbox`
`search_overpass`	Query OpenStreetMap via Overpass QL within a bbox or radius	`bbox`, `query`, `limit`, `radius_meters`
`list_osm_tags`	Look up correct OSM tags for a category	`category`
`aggregate_overpass_h3`	Run an Overpass query and bin results into H3 hexagons	`bbox`, `query`, `resolution`

All tools accept location (natural language, requires Mapbox token) or bbox (coordinates, WKT, GeoJSON, etc).

Quick Start

Add to your MCP client config:

Claude Desktop (Click to expand)

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "bbox": {
      "command": "npx",
      "args": ["-y", "bbox-mcp-server"]
    }
  }
}

Cursor (Click to expand)

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "bbox": {
      "command": "npx",
      "args": ["-y", "bbox-mcp-server"]
    }
  }
}

Windsurf (Click to expand)

Add to ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "bbox": {
      "command": "npx",
      "args": ["-y", "bbox-mcp-server"]
    }
  }
}

VS Code (GitHub Copilot) or Google Antigravity (Click to expand)

Add to .vscode/mcp.json in your workspace:

{
  "servers": {
    "bbox": {
      "command": "npx",
      "args": ["-y", "bbox-mcp-server"]
    }
  }
}

Try: "Find all coffee shops within 500m of Times Square"

Optional Configuration

{
  "mcpServers": {
    "bbox": {
      "command": "npx",
      "args": ["-y", "bbox-mcp-server"],
      "env": {
        "MAPBOX_ACCESS_TOKEN": "pk.your-token-here",
        "OVERPASS_API_URL": "https://your.custom.overpass.instance/api/interpreter"
      }
    }
  }
}

Variable	Default	Description
`MAPBOX_ACCESS_TOKEN`	—	Enables natural language location search (e.g. "San Francisco")
`OVERPASS_API_URL`	auto	Custom Overpass endpoint. By default, rotates between `overpass-api.de` and `kumi.systems`.
`MAX_H3_CELLS`	`50000`	Safety cap for H3 grid generation

Or install globally: npm install -g bbox-mcp-server

Tool Reference

`get_bounds`

Convert and project a bounding box across 6 input formats, 9 output formats, and 3,900+ coordinate systems. Returns the center point and tile coordinates for the centroid.

Param	Type	Default	Description
`bbox`	string	—	Input geometry (coordinates, WKT, GeoJSON, ogrinfo extent)
`epsg`	string	`"4326"`	Target projection. Unknown codes auto-fetched from epsg.io.
`format`	string	`"csv"`	Output: `csv`, `wkt`, `geojson-bbox`, `geojson-polygon`, `leaflet`, `overpass`, `ogc-bbox`, `kml`, `stac-bbox`
`coord_order`	string	`"lng,lat"`	Swap to `"lat,lng"` for APIs that expect latitude first
`zoom`	number	`15`	Zoom level for tile coordinate calculation
`precision`	number	`6`	Decimal places in formatted output

💡 Prompt: "Get the bounding box for Central Park in WKT format projected to EPSG:32618"

`get_h3_indices`

Generate Uber H3 hexagonal cell indices covering a bounding box.

Param	Type	Default	Description
`bbox`	string	—	Input geometry
`resolution`	number	—	H3 resolution (0–15)
`compact`	boolean	`false`	Merge cells into coarser parents where possible
`return_geometry`	boolean	`false`	Include GeoJSON hex boundaries

💡 Prompt: "Give me H3 cells at resolution 7 for downtown Chicago, include the hex geometries"

`search_overpass`

Execute an Overpass query within a bounding box or radius. Returns structured results with names, coordinates, and tags. The verification link plots each result as a pin on the map.

Param	Type	Default	Description
`bbox`	string	—	Input geometry
`query`	string	—	Overpass QL (e.g. `nwr["amenity"="cafe"]`). The server wraps it in the appropriate spatial filter automatically.
`radius_meters`	number	—	Search radius in metres. Use only when the user specifies an explicit distance (e.g. `2000` for "within 2km"). Omit for area/region queries.
`limit`	number	`100`	Max elements returned

💡 Prompt: "Find all parking within 2km of JFK airport"

💡 Prompt: "Search for hospitals in Manhattan, limit 50"

`list_osm_tags`

Look up the correct OpenStreetMap tags for a category before writing an Overpass query.

Param	Type	Description
`category`	string	Broad category (e.g. `"food"`, `"health"`, `"transport"`)

💡 Prompt: "What are the correct OSM tags for supermarkets?"

`aggregate_overpass_h3`

Run an Overpass query and bin results into H3 hexagons for spatial density analysis. Returns counts per cell and GeoJSON hex boundaries.

Param	Type	Default	Description
`bbox`	string	—	Input geometry
`query`	string	—	Overpass QL core query
`resolution`	number	`8`	H3 resolution for binning

💡 Prompt: "Aggregate all hospitals in Seattle into H3 bins at resolution 7"

`generate_share_url`

Generate a shareable link to visualize a bounding box on the interactive map at vibhorsingh.com/boundingbox.

Param	Type	Description
`bbox`	string	Input geometry

💡 Prompt: "Generate a share link for bbox 40.7128,-74.0060,40.7580,-73.9855"

Supported Input Formats

All tools auto-detect the input format. No need to specify which one you're using.

Format	Example
Raw coordinates	`40.7128,-74.0060,40.7580,-73.9855`
WKT	`POLYGON((-74.006 40.712, -73.985 40.712, ...))`
GeoJSON	`{"type":"Feature","geometry":{...}}`
GeoJSON bbox	`{"bbox":[-74.006,40.712,-73.985,40.758]}`
ogrinfo extent	`Extent: (-74.006, 40.712) - (-73.985, 40.758)`
Space-separated	`40.7128 -74.0060 40.7580 -73.9855`

🤖 For AI Agent Developers

Response structure

Every tool returns two content blocks:

Human-readable text — formatted output with the map verification link
Structured JSON — all computed data, machine-parseable

Example get_bounds JSON response:

{
  "original_wgs84": { "lat1": 40.7128, "lng1": -74.006, "lat2": 40.758, "lng2": -73.9855 },
  "projected": { "xmin": -8238310.23, "ymin": 4970241.32, "xmax": -8235527.11, "ymax": 4976491.56 },
  "center": { "lat": 40.7354, "lng": -73.99575 },
  "tile_indices": { "z": 15, "x": 9660, "y": 12284 },
  "epsg": "3857",
  "coord_order": "lng,lat",
  "area_km2": 8.681,
  "dimensions": { "width_km": 1.714, "height_km": 5.066 },
  "share_url": "https://vibhorsingh.com/boundingbox/#40.712800,-74.006000,40.758000,-73.985500"
}

Error handling

All errors return isError: true with a descriptive message. Invalid coordinates, unknown EPSG codes, and oversized H3 requests all return clean errors — the server never crashes on bad input.

Logging

Structured JSON logs go to stderr (stdout is reserved for MCP protocol). Each entry includes timestamp, level, and context.

Acknowledgments & Fair Use

OpenStreetMap

This tool is built on OpenStreetMap: A global dataset created and maintained by millions of volunteers. Every query you run returns data that someone walked, mapped, or verified by hand. If you find this useful, consider contributing to OSM.

Responsible Usage

The public Overpass API instances are free community resources with limited capacity. Avoid tight loops, excessive polling, or bulk-scraping. For heavy workloads, set OVERPASS_API_URL to your own instance, see Overpass API installation. The default server rotation helps spread load, but it's not a substitute for responsible usage.

License

MIT

Name		Name	Last commit message	Last commit date
Latest commit History 13 Commits
mcpb-build		mcpb-build
.gitignore		.gitignore
LICENSE		LICENSE
README.md		README.md
index.ts		index.ts
package-lock.json		package-lock.json
package.json		package.json
proj4defs.json		proj4defs.json
test.js		test.js
test_overpass.ts		test_overpass.ts
tsconfig.json		tsconfig.json

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🌍 bbox-mcp-server

What Can You Do With This?

What Makes This Different

Why This Exists

Tools at a Glance

Quick Start

Optional Configuration

Tool Reference

`get_bounds`

`get_h3_indices`

`search_overpass`

`list_osm_tags`

`aggregate_overpass_h3`

`generate_share_url`

Supported Input Formats

🤖 For AI Agent Developers

Response structure

Error handling

Logging

Acknowledgments & Fair Use

OpenStreetMap

Responsible Usage

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🌍 bbox-mcp-server

What Can You Do With This?

What Makes This Different

Why This Exists

Tools at a Glance

Quick Start

Optional Configuration

Tool Reference

get_bounds

get_h3_indices

search_overpass

list_osm_tags

aggregate_overpass_h3

generate_share_url

Supported Input Formats

🤖 For AI Agent Developers

Response structure

Error handling

Logging

Acknowledgments & Fair Use

OpenStreetMap

Responsible Usage

License

About

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`get_bounds`

`get_h3_indices`

`search_overpass`

`list_osm_tags`

`aggregate_overpass_h3`

`generate_share_url`