AI agents call calculate-distance to retrieve information from PostGIS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a pure calculation/read operation on spatial data. It takes two points as input and returns a computed distance value. There are no side effects, no data modifications, no deletions, no external operations triggered, and no financial implications. The tool is analogous to a SELECT query that computes a derived value, making it a Read category with low severity risk.
From the tool's definition Tool name 'calculate-distance' and description 'İki nokta arasındaki mesafeyi hesapla' (Calculate distance between two points) indicates a query operation that retrieves computed spatial distance between geometries without modifying any data.
Documented attack patterns abuse exactly the kind of access calculate-distance gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and PostGIS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for calculate-distance:
{
"version": "1",
"default": "deny",
"tools": {
"calculate-distance": {}
}
}calculate-distance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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İki nokta arasındaki mesafeyi hesapla. It is categorised as a Read tool in the PostGIS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the PostGIS MCP Server MCP server in PolicyLayer and add a rule for calculate-distance: 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 PostGIS MCP Server. Nothing to install.
calculate-distance 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-distance 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-distance. 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-distance is provided by the PostGIS MCP Server MCP server (receptopalak/postgis-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from PostGIS 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.
25 PostGIS MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.