cancel_single_trade · Composer Trade MCP: Risk & Policy

WHAT IT DOES

What cancel_single_trade does on Composer Trade

AI agents use cancel_single_trade to commit financial operations through Composer Trade — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why cancel_single_trade needs a policy

Cancelling a trade is a financial operation that directly affects investment activity. While it stops a pending trade rather than executing one, it commits to a financial decision (preventing a trade from occurring) with real portfolio consequences. It falls under Financial as it manipulates trading operations on a financial platform.

From the tool's definition Cancel a request for a single trade that has not executed yet.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cancel_single_trade Approval-gated

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

View as policy code

policy.json

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

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Composer Trade, so you can run agents against it safely.

FAQ

Questions about cancel_single_trade

What does the cancel_single_trade tool do? +

Cancel a request for a single trade that has not executed yet. It is categorised as a Financial tool in the Composer Trade MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on cancel_single_trade? +

Register the Composer Trade MCP server in PolicyLayer and add a rule for cancel_single_trade: 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 Composer Trade. Nothing to install.

What risk level is cancel_single_trade? +

cancel_single_trade 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_single_trade? +

Yes. Add a rate_limit block to the cancel_single_trade 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_single_trade completely? +

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

cancel_single_trade is provided by the Composer Trade MCP server (tanwithme/composer-trade-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.