canton_submit_command · Tenzro Ledger MCP: Risk & Policy

WHAT IT DOES

What canton_submit_command does on Tenzro Ledger MCP

AI agents invoke canton_submit_command 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 canton_submit_command needs a policy

This tool submits commands to a DAML ledger, which executes create or exercise operations. These are active ledger state changes that trigger smart contract logic. The effects depend on the arguments passed (what contract is created or exercised), making this an Execute-category tool.

From the tool's definition Submit a DAML create or exercise command

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

canton_submit_command Rate-limited

canton_submit_command 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": {
    "canton_submit_command": {
      "limits": [
        {
          "counter": "canton_submit_command_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 canton_submit_command

What does the canton_submit_command tool do? +

Submit a DAML create or exercise command. 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 canton_submit_command? +

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

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

Can I rate-limit canton_submit_command? +

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

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

canton_submit_command 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.