@maproll/mcp

@maproll/mcp

MCP server for maproll — make production-ready static maps from a URL.

Every map is a URL. This server gives an agent a typed way to build one, and returns the rendered map alongside it.

Status: M0 spike. One tool, no resources or prompts yet, not published. See the plan for what M1 adds.

Try it

npm install
npm run inspect      # MCP Inspector against the local source
npx tsx scripts/smoke.ts   # end-to-end: real MCP, real API, writes a PNG

Wire it into a client:

{
  "mcpServers": {
    "maproll": {
      "command": "npx",
      "args": ["-y", "@maproll/mcp"]
    }
  }
}

No API key. Anonymous renders carry the maproll wordmark; a token (later) makes logo a parameter the caller controls.

Tools

create_map

Structured data in, a map URL and a rendered PNG out.

{
  "scope": "world",
  "title": "Coffee consumption per capita",
  "values": [
    { "id": "FI", "value": 12 },
    { "id": "US", "value": 4.2 }
  ]
}

Returns svg_url, png_url, editor_url, a ready embed tag, and any warnings (e.g. region ids the renderer did not recognise). The svg_url is also the state handle — later tools take it and return a new one, so there is no session to keep.

editor_url opens the map in app.maproll.io with everything loaded and editable; the editor reads the query string back into state via its parseUrl.

Data arrives structured rather than as the packed US:200:#ff0000 wire form. That grammar is a serialisation detail; the server owns it.

Layout

src/
  index.ts          # stdio entry point
  server.ts         # transport-agnostic server construction
  map-url.ts        # the URL grammar — seed of the @maproll/map-url package
  scopes.ts         # GENERATED from editor/src/lib/scopes.ts
  render.ts         # PNG fetch + X-Geo-Warnings parsing
  tools/
    create-map.ts
scripts/smoke.ts    # end-to-end check

server.ts never mentions a transport, so the same tools ship over stdio today and streamable HTTP on a Worker later.

Known gaps

• map-url.ts is a copy of the editor's builder. M1 extracts it to @maproll/map-url and both sides import it.
• No resources, prompts, add_layers, or find_places yet.

Regenerating the scope catalog

src/scopes.ts is generated from editor/src/lib/scopes.ts. It is checked in so the package is self-contained; regenerate it when scopes change.