Convert WGS-84 lat/lng to a Chinese postal address (province, city, district, township, formatted address). Useful when you have raw GPS coordinates and need a human-readable place name, or the citycode/adcode to pass to other tools. Args: - lat (string, required): WGS-84 latitude, decimal, e.g.
AI agents call bus_reverse_geocode to retrieve information from Chelaile without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only geolocation lookup operation. It takes GPS coordinates as input and returns address information without creating, modifying, deleting, or executing any external operations. The worst-case misuse scenario (revealing location information from coordinates) has limited blast radius in a public transit context where routes and stops are already public.
From the tool's definition Tool converts WGS-84 coordinates to human-readable postal addresses. Description states it 'converts' and 'retrieves' location data with no mention of modification, deletion, or execution.
Documented attack patterns abuse exactly the kind of access bus_reverse_geocode gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Chelaile, and nothing reaches the server without passing your rules. This is the rule we recommend for bus_reverse_geocode:
{
"version": "1",
"default": "deny",
"tools": {
"bus_reverse_geocode": {}
}
}bus_reverse_geocode is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Convert WGS-84 lat/lng to a Chinese postal address (province, city, district, township, formatted address). Useful when you have raw GPS coordinates and need a human-readable place name, or the citycode/adcode to pass to other tools. Args: - lat (string, required): WGS-84 latitude, decimal, e.g. It is categorised as a Read tool in the Chelaile MCP Server, which means it retrieves data without modifying state.
Register the Chelaile MCP server in PolicyLayer and add a rule for bus_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 Chelaile. Nothing to install.
bus_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 bus_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 bus_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.
bus_reverse_geocode is provided by the Chelaile MCP server (peanutsplash/chelaile-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Chelaile, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
15 Chelaile tools catalogued and risk-classified — across an index of 43,000+ MCP servers.