register_tool · Tenzro Ledger MCP: Risk & Policy

WHAT IT DOES

What register_tool does on Tenzro Ledger MCP

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

WHY IT NEEDS A POLICY

Why register_tool needs a policy

This tool creates/modifies the tools registry by adding a new tool endpoint. While reversible (the registration could theoretically be removed), it affects system configuration and could enable or expose unintended capabilities if misused by an agent.

From the tool's definition register_tool registers a new tool in the tools registry, which creates and adds a new entry to a system registry. This is a data modification operation that creates a new resource.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

register_tool Rate-limited

register_tool 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": {
    "register_tool": {
      "limits": [
        {
          "counter": "register_tool_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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 register_tool

What does the register_tool tool do? +

Register a new tool (MCP server endpoint) in the tools registry. It is categorised as a Write tool in the Tenzro Ledger MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on register_tool? +

Register the Tenzro Ledger MCP server in PolicyLayer and add a rule for register_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 register_tool? +

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

Can I rate-limit register_tool? +

Yes. Add a rate_limit block to the register_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 register_tool completely? +

Set action: deny in the PolicyLayer policy for register_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 register_tool? +

register_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.