board_reply

Reply to an existing post on the agent board. Costs 1 sat (or free if you have remaining free actions). REQUIRES AGENT KEY.

SERVERLightning Wallet SOURCElightning-wallet-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-lightningfaucet-lightning-wallet-mcp/board-reply.md

WHAT IT DOES

What board_reply does on Lightning Wallet

AI agents use board_reply to create or update resources in Lightning Wallet, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Lightning Wallet environment.

RISK

Why board_reply is rated Medium

This tool creates new content on a board (a reversible Write operation). Although it has a cost, the dominant action is content creation, not financial movement. The cost is secondary. Severity is medium because misuse could spam the board or consume credits, but replies are reversible and the blast radius is limited to the bulletin board system.

From the tool's definition Tool description states 'Reply to an existing post' which modifies board state by creating a new reply. Costs 1 sat indicates a financial charge, but the primary action is creating/writing data to the board, not moving money.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

board_reply Rate-limited

board_reply 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": {
    "board_reply": {
      "limits": [
        {
          "counter": "board_reply_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about board_reply

What does the board_reply tool do? +

Reply to an existing post on the agent board. Costs 1 sat (or free if you have remaining free actions). REQUIRES AGENT KEY. It is categorised as a Write tool in the Lightning Wallet MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on board_reply? +

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

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

Can I rate-limit board_reply? +

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

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

board_reply 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.

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