cancel_order

THE RISK

Critical Risk

Why cancel_order needs a policy

Cancelling an open order on a DEX is a financial operation that alters an active trading position. While cancellation itself may be considered reversible in some sense (you could re-place the order), it directly affects financial instruments and trades on a blockchain, placing it firmly in the Financial category.

From the tool's definition 'Cancel an open order on the DEX' — directly modifies financial state by cancelling a DEX (decentralized exchange) trading order, affecting financial obligations and positions.

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

POLICY

How to control cancel_order

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 cancel_order:

policy.json

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

Any call to cancel_order 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 cancel_order

What does the cancel_order tool do? +

Cancel an open order on the DEX. The remaining unfilled amount will be. 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 cancel_order? +

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

cancel_order 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 cancel_order? +

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

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

cancel_order 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 →