pause_token

THE RISK

Critical Risk

Why pause_token needs a policy

Pausing all transfers on a payment token halts all financial activity for that token across all users. This is a high-impact financial operation that can freeze funds and prevent any transactions from occurring, representing a critical blast radius. It is irreversible in effect until unpaused, and operates on a financial instrument (stablecoin payments).

From the tool's definition Emergency pause all transfers on a TIP-20 token

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

POLICY

How to control pause_token

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 pause_token:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pause_token": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to pause_token is blocked until a human approves it. The rest of the server keeps working.

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

Govern MCP payment tools → Approval gates, spend caps, and per-identity scopes on every refund, payout, and charge your agents make.
Critical-risk tools in Tempo → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about pause_token

What does the pause_token tool do? +

Emergency pause all transfers on a TIP-20 token. Requires PAUSE_ROLE. It is categorised as a Financial tool in the Tempo MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on pause_token? +

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

pause_token is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit pause_token? +

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

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

pause_token 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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