reveal_cell · Minesweeper MCP Server MCP: Risk & Policy

WHAT IT DOES

What reveal_cell does on Minesweeper MCP Server

AI agents invoke reveal_cell to trigger actions in Minesweeper MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why reveal_cell needs a policy

Revealing a cell executes a game action that changes the board state (potentially triggering cascading reveals or a game-over condition). It is not a pure read (it modifies state), not a write in the data-persistence sense, and not destructive/financial. Execute best captures that it triggers an operation whose effects depend on the cell chosen.

From the tool's definition 'Reveal a cell on the Minesweeper board' — triggers a game action/state change on the board

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

reveal_cell Rate-limited

reveal_cell stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "reveal_cell": {
      "limits": [
        {
          "counter": "reveal_cell_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Minesweeper MCP Server, so you can run agents against it safely.

FAQ

Questions about reveal_cell

What does the reveal_cell tool do? +

Reveal a cell on the Minesweeper board. It is categorised as a Execute tool in the Minesweeper MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on reveal_cell? +

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

What risk level is reveal_cell? +

reveal_cell is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit reveal_cell? +

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

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

reveal_cell is provided by the Minesweeper MCP Server MCP server (vic563/mindsweeper-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.