use_registered_tool · Tenzro Ledger MCP: Risk & Policy

WHAT IT DOES

What use_registered_tool does on Tenzro Ledger MCP

AI agents invoke use_registered_tool to trigger actions in Tenzro Ledger MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why use_registered_tool needs a policy

This tool acts as a generic executor for other tools without built-in constraints. Given the financial and irreversible operations available on the same server (payments, minting, staking, contract calls, mandate signing), use_registered_tool could be weaponized to invoke any of these with malicious arguments.

From the tool's definition Tool name 'use_registered_tool' and description 'Invoke a registered tool with the given input data' indicates dynamic execution of arbitrary registered tools.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

use_registered_tool Rate-limited

use_registered_tool stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "use_registered_tool": {
      "limits": [
        {
          "counter": "use_registered_tool_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

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 use_registered_tool

What does the use_registered_tool tool do? +

Invoke a registered tool with the given input data. It is categorised as a Execute tool in the Tenzro Ledger MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on use_registered_tool? +

Register the Tenzro Ledger MCP server in PolicyLayer and add a rule for use_registered_tool: 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 use_registered_tool? +

use_registered_tool is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit use_registered_tool? +

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

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

use_registered_tool 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.