AI agents call find_position_in_pgn to retrieve information from MCP Chess Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries PGN files to locate specific chess positions—a retrieval operation with no side effects, matching the 'Read' category definition. Finding a position does not modify game state, execute code, or cause irreversible changes. Low severity because misuse only retrieves chess game data without external impact.
From the tool's definition Tool name 'find_position_in_pgn' and context indicate it searches or retrieves position data from PGN (Portable Game Notation) files.
Documented attack patterns abuse exactly the kind of access find_position_in_pgn gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Chess Server, and nothing reaches the server without passing your rules. This is the rule we recommend for find_position_in_pgn:
{
"version": "1",
"default": "deny",
"tools": {
"find_position_in_pgn": {}
}
}find_position_in_pgn is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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find_position_in_pgn. It is categorised as a Read tool in the MCP Chess Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Chess Server MCP server in PolicyLayer and add a rule for find_position_in_pgn: 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 MCP Chess Server. Nothing to install.
find_position_in_pgn 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 find_position_in_pgn 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 find_position_in_pgn. 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.
find_position_in_pgn is provided by the MCP Chess Server MCP server (jiayao/mcp-chess). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP Chess Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 MCP Chess Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.