extract-raster-value

THE RISK

Low Risk

Why extract-raster-value needs a policy

This tool retrieves/queries spatial raster data at specified coordinates. It has no side effects—it does not create, modify, delete, or execute code. The operation is a simple read of existing raster values, consistent with Read category tools like 'get' and 'fetch'.

From the tool's definition Tool name 'extract-raster-value' and description 'Belirli koordinattaki raster değerini çıkar' (Turkish: 'Extract raster value at specific coordinates') indicate a retrieval operation that queries raster data at a point location without modifying data.

Documented attack patterns abuse exactly the kind of access extract-raster-value gives an agent:

POLICY

How to control extract-raster-value

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 extract-raster-value:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "extract-raster-value": {}
  }
}

extract-raster-value is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register PostGIS MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about extract-raster-value

What does the extract-raster-value tool do? +

Belirli koordinattaki raster değerini çıkar. It is categorised as a Read tool in the PostGIS MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on extract-raster-value? +

Register the PostGIS MCP Server MCP server in PolicyLayer and add a rule for extract-raster-value: 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.

What risk level is extract-raster-value? +

extract-raster-value is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit extract-raster-value? +

Yes. Add a rate_limit block to the extract-raster-value 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 extract-raster-value completely? +

Set action: deny in the PolicyLayer policy for extract-raster-value. 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 extract-raster-value? +

extract-raster-value 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.

Enforce policy on every PostGIS MCP Server tool call.

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.

CHECK YOUR STACK →