cancel_operation_handoff · XGR MCP Gateway MCP

WHAT IT DOES

What cancel_operation_handoff does on XGR MCP Gateway

AI agents use cancel_operation_handoff to create or update resources in XGR MCP Gateway — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your XGR MCP Gateway environment.

WHY IT NEEDS A POLICY

Why cancel_operation_handoff needs a policy

This tool cancels a pending off-chain handoff record, which is a reversible write operation (modifying state from pending to cancelled). It explicitly does not affect on-chain transactions, limiting its blast radius. It is not destructive in the irreversible sense since it only affects off-chain pending state, and it is not financial since no money or financial obligations are moved.

From the tool's definition Cancel a pending offchain operation handoff. This never cancels already signed or submitted chain transactions.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cancel_operation_handoff Rate-limited

cancel_operation_handoff 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.

View as policy code

policy.json

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

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Instant setup, no code required.

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

FAQ

Questions about cancel_operation_handoff

What does the cancel_operation_handoff tool do? +

Cancel a pending offchain operation handoff. This never cancels already signed or submitted chain transactions. It is categorised as a Write tool in the XGR MCP Gateway MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on cancel_operation_handoff? +

Register the XGR MCP Gateway MCP server in PolicyLayer and add a rule for cancel_operation_handoff: 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 XGR MCP Gateway. Nothing to install.

What risk level is cancel_operation_handoff? +

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

Can I rate-limit cancel_operation_handoff? +

Yes. Add a rate_limit block to the cancel_operation_handoff 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_operation_handoff completely? +

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

cancel_operation_handoff is provided by the XGR MCP Gateway MCP server (xgr-network/xgr-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.