is_blacklisted

THE RISK

Low Risk

Why is_blacklisted needs a policy

This tool performs a read-only lookup to determine whether an address matches blacklist criteria. It has no side effects—it does not modify the blacklist, transfer funds, execute transactions, or trigger external actions.

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

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

POLICY

How to control is_blacklisted

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_blacklisted:

policy.json

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

is_blacklisted 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.

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EXPLORE

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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_blacklisted

What does the is_blacklisted tool do? +

Check if an address is on the blacklist 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_blacklisted? +

Register the Tempo MCP server in PolicyLayer and add a rule for is_blacklisted: 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_blacklisted? +

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

Can I rate-limit is_blacklisted? +

Yes. Add a rate_limit block to the is_blacklisted 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_blacklisted completely? +

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

is_blacklisted 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.

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