ldk_generate_invoice · LDK MCP Server MCP: Risk & Policy

WHAT IT DOES

What ldk_generate_invoice does on LDK MCP Server

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

WHY IT NEEDS A POLICY

Why ldk_generate_invoice needs a policy

Generating a Lightning invoice creates a new, reversible financial record that can be queried, modified, or canceled. While it doesn't move funds directly, it commits the wallet to accept payment under specified terms and could mislead a user into accepting unwanted payments if misused by an agent.

From the tool's definition Tool name 'ldk_generate_invoice' and description 'Generate a Lightning invoice with real payment hash for testing' indicate creation of a new financial artifact (an invoice).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ldk_generate_invoice Rate-limited

ldk_generate_invoice 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": {
    "ldk_generate_invoice": {
      "limits": [
        {
          "counter": "ldk_generate_invoice_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 LDK MCP Server, so you can run agents against it safely.

FAQ

Questions about ldk_generate_invoice

What does the ldk_generate_invoice tool do? +

Generate a Lightning invoice with real payment hash for testing. It is categorised as a Write tool in the LDK MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on ldk_generate_invoice? +

Register the LDK MCP Server MCP server in PolicyLayer and add a rule for ldk_generate_invoice: 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 LDK MCP Server. Nothing to install.

What risk level is ldk_generate_invoice? +

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

Can I rate-limit ldk_generate_invoice? +

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

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

ldk_generate_invoice is provided by the LDK MCP Server MCP server (stevengeller/ldk-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.