AI agents call geometry-centroid 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 read-only spatial calculation. It takes a geometry as input and returns its centroid point, which is a standard GIS query operation with no side effects, no data modification, and no irreversible actions. The low severity reflects minimal risk even if misused—it cannot corrupt data, delete records, or cause financial impact.
From the tool's definition Tool name 'geometry-centroid' and description 'Geometrinin merkez noktasını bul' (Turkish: 'Find the center point of geometry') indicates a calculation/query operation that retrieves a computed centroid from existing spatial data without modifying or deleting…
Documented attack patterns abuse exactly the kind of access geometry-centroid 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 geometry-centroid:
{
"version": "1",
"default": "deny",
"tools": {
"geometry-centroid": {}
}
}geometry-centroid is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Geometrinin merkez noktasını bul. 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 geometry-centroid: 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.
geometry-centroid 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 geometry-centroid 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 geometry-centroid. 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.
geometry-centroid 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.
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25 PostGIS MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.