bridge_with_hook · Tenzro Ledger MCP: Risk & Policy

WHAT IT DOES

What bridge_with_hook does on Tenzro Ledger MCP

AI agents use bridge_with_hook to commit financial operations through Tenzro Ledger MCP — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why bridge_with_hook needs a policy

This tool moves tokens across chains (cross-chain bridge), which constitutes a financial transaction moving assets. It also executes a contract call on the destination chain post-delivery, adding an Execute dimension. Per the severity rules, Financial > Execute, so it's classified as Financial.

From the tool's definition Bridge tokens with a post-delivery hook to execute a contract call on the destination chain

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bridge_with_hook Approval-gated

Any call to bridge_with_hook 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": {
    "bridge_with_hook": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

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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 Tenzro Ledger MCP, so you can run agents against it safely.

FAQ

Questions about bridge_with_hook

What does the bridge_with_hook tool do? +

Bridge tokens with a post-delivery hook to execute a contract call on the destination chain. It is categorised as a Financial tool in the Tenzro Ledger MCP MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on bridge_with_hook? +

Register the Tenzro Ledger MCP server in PolicyLayer and add a rule for bridge_with_hook: 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 Tenzro Ledger MCP. Nothing to install.

What risk level is bridge_with_hook? +

bridge_with_hook 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 bridge_with_hook? +

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

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

bridge_with_hook is provided by the Tenzro Ledger MCP server (https://canton-mcp.tenzro.network/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.