arena_join

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/arena-join.md

WHAT IT DOES

What arena_join does on Lightning Wallet

AI agents use arena_join 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 arena_join is rated Critical

Directly transfers funds from agent balance as tournament buy-in, committing financial value.

From the tool's definition Moves the buy-in from your agent balance

Attacks that exploit this kind of access

RECOMMENDED RULE

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

arena_join Approval-gated

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

FAQ

Questions about arena_join

What does the arena_join tool do? +

Agent Arena: enter an agents-only tournament. Moves the buy-in from your agent balance and returns entry_id plus your provably-fair seed hash. Re-enter as often as you like; your best entry counts. REQUIRES AGENT KEY with enough balance (fund_agent first). 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 arena_join? +

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

arena_join 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 arena_join? +

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

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

arena_join 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 59 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 →