france-data-mcp

reverse_geocode

Read-onlyIdempotent

Géocodage inverse : à partir de coordonnées GPS, retrouve l'adresse la plus proche. Source : IGN Géoplateforme. Couverture France métropolitaine + DOM uniquement : des coordonnées hors zone (ex. New York) ou en pleine mer renvoient null (pas une erreur — c'est l'absence de résultat, pas une panne).

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "lon": "<lon>",
      "lat": "<lat>"
    },
    "name": "reverse_geocode"
  }
}

Input Schema

Name	Required	Description	Default
`lat`	Yes	Latitude (WGS84).
`lon`	Yes	Longitude (WGS84).

Schema Changelog

Changes observed during successful MCP inspections.

First observedMay 13, 2026

TDQS

A4.4/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint, openWorldHint, idempotentHint true, and destructiveHint false. Description adds valuable behavioral context: coverage limitation, null return meaning 'no result not error', and data source attribution. No contradictions.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Description is two sentences, concise, and front-loaded with the primary purpose. Every sentence adds value (purpose, source, coverage, special return behavior). No wasted words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given no output schema, description mentions that out-of-zone coordinates return null, which partially addresses return behavior. However, it does not specify the format of the returned address. Still, for a simple tool with good annotations, it is nearly complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Input schema has 100% description coverage for both parameters (lat and lon with WGS84). Description does not add additional semantics beyond what the schema provides. Baseline 3 is appropriate since schema already explains parameters.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description clearly states 'reverse geocoding' and retrieves nearest address from GPS coordinates. Specifies data source (IGN Géoplateforme) and coverage, distinguishing it from sibling tool geocode_adresse which does forward geocoding.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides clear context on coverage (France métropolitaine + DOM) and behavior for out-of-zone coordinates (returns null). Does not explicitly state when to use versus alternatives, but the tool's purpose is self-evident and no other sibling does reverse geocoding.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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