reverse_geocode
Reverse geocode coordinates to a human-readable address. Uses Nominatim (free, no key). Returns display name, structured address components (road, city, country, postcode), and OSM identifiers. Parameters: lat — Latitude coordinate (required), e.g. 51.5. lon — Longitude coordinate (required), e.g...
This record as markdown: /tools/com-gadgethumans-swarm-x402-middleware/reverse-geocode.md
What reverse_geocode does on X402 Middleware
AI agents call reverse_geocode to retrieve information from X402 Middleware without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
lat | number | Yes | |
lon | number | Yes |
Parameters from the server's own tool schema.
Why reverse_geocode is rated Low
This tool retrieves publicly available geographic data based on coordinates. It performs a query operation with no side effects, data modification, code execution, or financial implications. The only data returned is address information derived from public mapping sources. Low severity due to minimal security impact—reverse geocoding is a standard, non-sensitive read operation.
From the tool's definition Tool description states it 'Reverse geocode coordinates to a human-readable address' and 'Returns display name, structured address components'. The parameters are latitude and longitude inputs with no modification or deletion capabilities.
Attacks that exploit this kind of access
The rule that runs reverse_geocode safely
PolicyLayer is an MCP gateway: it sits between your AI agents and X402 Middleware, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For reverse_geocode, this is the rule to start with:
reverse_geocode is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect X402 Middleware, apply this rule, and every reverse_geocode call is checked against it from then on.
Questions about reverse_geocode
Reverse geocode coordinates to a human-readable address. Uses Nominatim (free, no key). Returns display name, structured address components (road, city, country, postcode), and OSM identifiers. Parameters: lat — Latitude coordinate (required), e.g. 51.5. lon — Longitude coordinate (required), e.g. -0.12. It is categorised as a Read tool in the X402 Middleware MCP Server, which means it retrieves data without modifying state.
reverse_geocode accepts 2 parameters: lat, lon. Required: lat, lon. The full parameter table on this page comes from the server's own tool schema.
Register the X402 Middleware MCP server in PolicyLayer and add a rule for reverse_geocode: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches X402 Middleware. Nothing to install.
reverse_geocode is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the reverse_geocode rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for reverse_geocode. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
reverse_geocode is provided by the X402 Middleware MCP server (@gadgethumans/x402). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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