is_valid

THE RISK

Low Risk

Why is_valid needs a policy

This tool performs a read-only validation check on geometric data. It retrieves or queries the validity status of a geometry without creating, modifying, deleting, or executing any operations that would change state or trigger external effects. The tool has minimal blast radius if misused by an agent, as it cannot cause data loss, corruption, or unintended external actions.

From the tool's definition Tool name is 'is_valid' and description states 'Check if a geometry is valid' — a validation/inspection operation with no side effects.

Documented attack patterns abuse exactly the kind of access is_valid gives an agent:

POLICY

How to control is_valid

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 is_valid:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "is_valid": {}
  }
}

is_valid 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 GIS 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

More GIS MCP Server tools

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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 is_valid

What does the is_valid tool do? +

Check if a geometry is valid. It is categorised as a Read tool in the GIS MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on is_valid? +

Register the GIS MCP Server MCP server in PolicyLayer and add a rule for is_valid: 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.

What risk level is is_valid? +

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

Can I rate-limit is_valid? +

Yes. Add a rate_limit block to the is_valid 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 is_valid completely? +

Set action: deny in the PolicyLayer policy for is_valid. 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 is_valid? +

is_valid 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.

Enforce policy on every GIS MCP Server tool call.

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.

CHECK YOUR STACK →