urwa_set_frozen_tokens · Tenzro Ledger MCP: Risk & Policy

WHAT IT DOES

What urwa_set_frozen_tokens does on Tenzro Ledger MCP

AI agents use urwa_set_frozen_tokens 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 urwa_set_frozen_tokens needs a policy

An AI agent can call urwa_set_frozen_tokens faster than any human can review — one bad instruction and it creates or modifies resources in Tenzro Ledger MCP by the hundred, each call as confident as the last.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

urwa_set_frozen_tokens Rate-limited

urwa_set_frozen_tokens 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": {
    "urwa_set_frozen_tokens": {
      "limits": [
        {
          "counter": "urwa_set_frozen_tokens_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 urwa_set_frozen_tokens

What does the urwa_set_frozen_tokens tool do? +

(Admin) Freeze a specific amount on an ERC-7943 token account. 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 urwa_set_frozen_tokens? +

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

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

Can I rate-limit urwa_set_frozen_tokens? +

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

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

urwa_set_frozen_tokens 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.