AI agents call lichess_puzzle_daily to retrieve information from UnClick without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool fetches a puzzle from Lichess, a chess platform. It is a retrieval operation that does not create, modify, delete, or execute code. The action is read-only and has no meaningful blast radius if misused by an AI agent.
From the tool's definition Tool name and description indicate retrieval of data: 'Get the Lichess daily puzzle' — a query operation with no side effects or state modification.
Attacks that exploit this kind of access
Get the Lichess daily puzzle. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
Register the UnClick MCP server in PolicyLayer and add a rule for lichess_puzzle_daily: 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 UnClick. Nothing to install.
lichess_puzzle_daily is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the lichess_puzzle_daily 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.
Set action: deny in the PolicyLayer policy for lichess_puzzle_daily. 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.
lichess_puzzle_daily is provided by the UnClick MCP server (@unclick/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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