remove_from_blacklist

THE RISK

Medium Risk

Why remove_from_blacklist needs a policy

This tool modifies a compliance/security policy by removing an address from a blacklist, effectively unblocking it from transactions. This is a reversible write operation (the address can be re-added), but carries high severity because misuse by an AI agent could unblock malicious or sanctioned addresses, enabling prohibited financial activity on the Tempo stablecoin network.

From the tool's definition Remove an address from a TIP-403 policy blacklist (unblock the address)

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

POLICY

How to control remove_from_blacklist

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 remove_from_blacklist:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "remove_from_blacklist": {
      "limits": [
        {
          "counter": "remove_from_blacklist_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

remove_from_blacklist stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
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 remove_from_blacklist

What does the remove_from_blacklist tool do? +

Remove an address from a TIP-403 policy blacklist (unblock the address). It is categorised as a Write tool in the Tempo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on remove_from_blacklist? +

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

remove_from_blacklist is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit remove_from_blacklist? +

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

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

remove_from_blacklist 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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