claim_lnurl_withdraw

Claim funds from an LNURL-withdraw link. REQUIRES AGENT KEY.

SERVERLightning Wallet SOURCElightning-wallet-mcp

Critical RISK CLASS

Category Financial

Parameters 00 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-lightningfaucet-lightning-wallet-mcp/claim-lnurl-withdraw.md

WHAT IT DOES

What claim_lnurl_withdraw does on Lightning Wallet

AI agents use claim_lnurl_withdraw to commit financial operations through Lightning Wallet, usually the final step of a payment, billing, or trading workflow. A call moves real money.

RISK

Why claim_lnurl_withdraw is rated Critical

This tool commits a financial obligation and transfers value (Bitcoin funds) to the agent's wallet. Even though the agent is claiming pre-authorized funds rather than sending them, the economic effect is identical to a payment: cryptocurrency moves and wallet balances change irreversibly. Misuse could allow an attacker to drain LNURL-withdraw links, steal funds, or redirect payments.

From the tool's definition Tool description states 'Claim funds from an LNURL-withdraw link' — directly moves cryptocurrency (Bitcoin via Lightning Network) into the agent's wallet. LNURL-withdraw is a standard protocol for receiving Lightning payments.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs claim_lnurl_withdraw safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Lightning Wallet, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For claim_lnurl_withdraw, this is the rule to start with:

claim_lnurl_withdraw Approval-gated

Any call to claim_lnurl_withdraw 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": {
    "claim_lnurl_withdraw": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Lightning Wallet, apply this rule, and every claim_lnurl_withdraw call is checked against it from then on.

FAQ

Questions about claim_lnurl_withdraw

What does the claim_lnurl_withdraw tool do? +

Claim funds from an LNURL-withdraw link. REQUIRES AGENT KEY. It is categorised as a Financial tool in the Lightning Wallet MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on claim_lnurl_withdraw? +

Register the Lightning Wallet MCP server in PolicyLayer and add a rule for claim_lnurl_withdraw: 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 Lightning Wallet. Nothing to install.

What risk level is claim_lnurl_withdraw? +

claim_lnurl_withdraw 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 claim_lnurl_withdraw? +

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

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

claim_lnurl_withdraw is provided by the Lightning Wallet MCP server (lightning-wallet-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Lightning Wallet, and thousands of servers like it.

This server

All 45 Lightning Wallet tools → Critical-risk tools on this server →

Across the catalogue

build_redeem_withdraw_tx on Atv →withdraw_coin on Indodax MCP Server → All critical-risk MCP tools → The MCP Attack Database →

Guides

Govern MCP payment tools →Human-in-the-loop →Tool call approval →