set_spending_limits · Tenzro Ledger MCP: Risk & Policy

WHAT IT DOES

What set_spending_limits does on Tenzro Ledger MCP

AI agents use set_spending_limits 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 set_spending_limits needs a policy

This tool modifies financial controls on a wallet by configuring spending limits. While it doesn't directly move money, it governs how much money can be spent per day and per transaction, making it a financial configuration tool. Misuse could raise limits to allow unauthorized large transfers, directly enabling financial loss.

From the tool's definition Set daily and per-transaction spending limits for a wallet

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_spending_limits Approval-gated

Any call to set_spending_limits 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": {
    "set_spending_limits": {
      "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 set_spending_limits

What does the set_spending_limits tool do? +

Set daily and per-transaction spending limits for a wallet. 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 set_spending_limits? +

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

set_spending_limits 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 set_spending_limits? +

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

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

set_spending_limits 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.