Calculate the shortest path between two points using a saved street network. Args: graphml_path: Path to the saved GraphML file origin: (lat, lon) tuple for the origin destination: (lat, lon) tuple for the destination Returns: List of node IDs representing the shortest path or error message.
AI agents call calculate_shortest_path to retrieve information from GIS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that computes and retrieves routing information from an existing geospatial dataset without creating, modifying, or deleting any data. The tool has minimal blast radius if misused—it may return incorrect routes or consume computation resources, but cannot damage systems or data.
From the tool's definition The tool 'calculate_shortest_path' retrieves data by querying a saved street network to determine a route between two points. It returns 'List of node IDs representing the shortest path' with no modification, deletion, or creation of data.
Documented attack patterns abuse exactly the kind of access calculate_shortest_path gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and GIS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for calculate_shortest_path:
{
"version": "1",
"default": "deny",
"tools": {
"calculate_shortest_path": {}
}
}calculate_shortest_path is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Calculate the shortest path between two points using a saved street network. Args: graphml_path: Path to the saved GraphML file origin: (lat, lon) tuple for the origin destination: (lat, lon) tuple for the destination Returns: List of node IDs representing the shortest path or error message. It is categorised as a Read tool in the GIS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the GIS MCP Server MCP server in PolicyLayer and add a rule for calculate_shortest_path: 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 GIS MCP Server. Nothing to install.
calculate_shortest_path 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 calculate_shortest_path 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 calculate_shortest_path. 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.
calculate_shortest_path is provided by the GIS MCP Server MCP server (mahdin75/gis-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from GIS MCP Server, 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.
98 GIS MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.