Fetch the principal variation (best line) for a position from ChessDB
AI agents call get-chessdb-pv to retrieve information from ChessAgine MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries an existing chess database to retrieve pre-computed analysis data. The 'Fetch' and 'get' terminology, combined with the straightforward retrieval of analytical results, confirms this is a Read operation. No data is created, modified, or deleted; no external commands are executed; and no financial transactions occur.
From the tool's definition Tool 'get-chessdb-pv' uses verb 'Fetch' and 'get-' prefix, indicating data retrieval. Description states it retrieves 'the principal variation (best line) for a position from ChessDB' — a pure query operation with no side effects.
Attacks that exploit this kind of access
Fetch the principal variation (best line) for a position from ChessDB. It is categorised as a Read tool in the ChessAgine MCP MCP Server, which means it retrieves data without modifying state.
Register the ChessAgine MCP server in PolicyLayer and add a rule for get-chessdb-pv: 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 ChessAgine MCP. Nothing to install.
get-chessdb-pv 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 get-chessdb-pv 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 get-chessdb-pv. 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.
get-chessdb-pv is provided by the ChessAgine MCP server (jalpp/chessagine-mcp). 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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