is_whitelisted

THE RISK

Low Risk

Why is_whitelisted needs a policy

This tool performs a lookup/query operation to determine whether an address exists on a whitelist. It has no side effects, does not execute transactions, does not modify data, and does not delete or create records. It is purely informational. While the server as a whole handles financial operations (stablecoin payments), this specific tool is a read-only compliance check.

From the tool's definition Tool name 'is_whitelisted' and description 'Check if an address is on the whitelist' indicate a query operation that retrieves whitelist status without modifying any state.

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

POLICY

How to control is_whitelisted

PolicyLayer is an MCP gateway — it sits between your AI agents and Tempo, and nothing reaches the server without passing your rules. This is the rule we recommend for is_whitelisted:

policy.json

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

is_whitelisted 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 Tempo — 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 →

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EXPLORE

Related tools and policies

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Go deeper

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
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 →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about is_whitelisted

What does the is_whitelisted tool do? +

Check if an address is on the whitelist for a TIP-403 policy. It is categorised as a Read tool in the Tempo MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on is_whitelisted? +

Register the Tempo MCP server in PolicyLayer and add a rule for is_whitelisted: 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 Tempo. Nothing to install.

What risk level is is_whitelisted? +

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

Can I rate-limit is_whitelisted? +

Yes. Add a rate_limit block to the is_whitelisted 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_whitelisted completely? +

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

is_whitelisted is provided by the Tempo MCP server (arome3/tempo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Tempo tool call.

Start from Tempo, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →