lichess_resign · Lichess MCP: Risk & Policy

WHAT IT DOES

What lichess_resign does on Lichess MCP

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

WHY IT NEEDS A POLICY

Why lichess_resign needs a policy

Resigning a game is a reversible-in-principle write action (it changes game state and records a loss), but the game outcome itself cannot be undone — however, it does not delete data, execute code, or involve finances. It modifies the state of an active game by conceding, which is best categorized as Write.

From the tool's definition Resign and forfeit an active Lichess chess game. Concedes the game to your opponent.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

lichess_resign Rate-limited

lichess_resign 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": {
    "lichess_resign": {
      "limits": [
        {
          "counter": "lichess_resign_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about lichess_resign

What does the lichess_resign tool do? +

Resign and forfeit an active Lichess chess game. Concedes the game to your opponent. It is categorised as a Write tool in the Lichess MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on lichess_resign? +

Register the Lichess MCP server in PolicyLayer and add a rule for lichess_resign: 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 Lichess MCP. Nothing to install.

What risk level is lichess_resign? +

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

Can I rate-limit lichess_resign? +

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

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

lichess_resign is provided by the Lichess MCP server (jamespdaily/lichess-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.