get-filterable-attributes

THE RISK

Low Risk

Why get-filterable-attributes needs a policy

This tool retrieves metadata about available filter attributes from a sample entity. It is a read-only operation that queries information without creating, modifying, deleting, executing code, or committing financial transactions. The blast radius is minimal—worst case, an agent learns what attributes are filterable, which is non-sensitive metadata disclosure.

From the tool's definition Tool name 'get-filterable-attributes' and description 'Get the list of attributes that can be used for filtering by examining a sample entity' indicate a retrieval operation with no modification or side effects.

Documented attack patterns abuse exactly the kind of access get-filterable-attributes gives an agent:

POLICY

How to control get-filterable-attributes

PolicyLayer is an MCP gateway — it sits between your AI agents and PI API MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get-filterable-attributes:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get-filterable-attributes": {}
  }
}

get-filterable-attributes 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 PI API 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

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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 get-filterable-attributes

What does the get-filterable-attributes tool do? +

Get the list of attributes that can be used for filtering by examining a sample entity. It is categorised as a Read tool in the PI API MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get-filterable-attributes? +

Register the PI API MCP Server MCP server in PolicyLayer and add a rule for get-filterable-attributes: 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 PI API MCP Server. Nothing to install.

What risk level is get-filterable-attributes? +

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

Can I rate-limit get-filterable-attributes? +

Yes. Add a rate_limit block to the get-filterable-attributes 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 get-filterable-attributes completely? +

Set action: deny in the PolicyLayer policy for get-filterable-attributes. 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 get-filterable-attributes? +

get-filterable-attributes is provided by the PI API MCP Server MCP server (mingzilla/pi-api-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every PI API MCP Server tool call.

Start from PI API 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 →