set_budget

Set or update budget limit for an agent. REQUIRES OPERATOR 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/set-budget.md

WHAT IT DOES

What set_budget does on Lightning Wallet

AI agents use set_budget 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 set_budget is rated Critical

This tool governs financial spending limits for agents on a Bitcoin/Lightning wallet platform. Setting or updating a budget directly affects financial obligations and spending authority. Misuse could allow an agent to spend far more (or less) than intended, making this a Financial category tool with high severity.

From the tool's definition 'Set or update budget limit for an agent' on a Bitcoin Lightning Wallet server — controls how much an agent can spend financially

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_budget 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 set_budget, this is the rule to start with:

set_budget Approval-gated

Any call to set_budget 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_budget": {
      "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 set_budget call is checked against it from then on.

FAQ

Questions about set_budget

What does the set_budget tool do? +

Set or update budget limit for an agent. REQUIRES OPERATOR 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 set_budget? +

Register the Lightning Wallet MCP server in PolicyLayer and add a rule for set_budget: 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 set_budget? +

set_budget 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_budget? +

Yes. Add a rate_limit block to the set_budget 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_budget completely? +

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

set_budget 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

All critical-risk MCP tools → The MCP Attack Database →

Guides

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