AI agents call chess_leaderboards 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 queries and retrieves publicly available leaderboard data from Chess.com. It performs a straightforward data lookup with no ability to modify, delete, execute code, or create financial obligations. The blast radius of misuse is negligible—an agent could retrieve leaderboard information repeatedly, but this causes no harm to systems or data integrity.
From the tool's definition Tool name 'chess_leaderboards' and description 'Get Chess.com leaderboards' indicate a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Get Chess.com leaderboards. 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 chess_leaderboards: 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.
chess_leaderboards 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 chess_leaderboards 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 chess_leaderboards. 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.
chess_leaderboards 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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