raster_calc · LocuSync Server MCP: Risk & Policy

WHAT IT DOES

What raster_calc does on LocuSync Server

AI agents invoke raster_calc to trigger actions in LocuSync Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why raster_calc needs a policy

The name 'raster_calc' implies executing a calculation on raster data, which in GIS contexts typically involves running algebraic expressions or formulas across raster datasets (similar to GDAL's gdal_calc or QGIS raster calculator). This is an Execute-category operation as it runs computations with effects dependent on the expression provided. However, with an empty description, confidence is lowered.

From the tool's definition Tool name 'raster_calc' suggests raster calculation/computation; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

raster_calc Rate-limited

raster_calc stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "raster_calc": {
      "limits": [
        {
          "counter": "raster_calc_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches LocuSync Server, so you can run agents against it safely.

FAQ

Questions about raster_calc

What does the raster_calc tool do? +

raster_calc. It is categorised as a Execute tool in the LocuSync Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on raster_calc? +

Register the LocuSync Server MCP server in PolicyLayer and add a rule for raster_calc: 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 LocuSync Server. Nothing to install.

What risk level is raster_calc? +

raster_calc is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit raster_calc? +

Yes. Add a rate_limit block to the raster_calc 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.

How do I block raster_calc completely? +

Set action: deny in the PolicyLayer policy for raster_calc. 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.

What MCP server provides raster_calc? +

raster_calc is provided by the LocuSync Server MCP server (matbel91765/gis-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.