MCP Tool Definition Quality Score (TDQS) Spec
An open framework for scoring how well an MCP tool definition communicates to an AI agent. Specification, reference implementation, CLI and hosted API.
MCP Tool Definition Quality Score (TDQS) Spec launched on September 3, 2026 with 8 votes, #1,109 of 8,093 launches that month and more than 75% of that year's launches.
What it does
The description is the only thing an agent reads before it picks a tool. TDQS grades every definition on six weighted dimensions, explains each point, and turns the result into a tier you can gate a release on — the same numbers in your terminal, in CI, and across Glama's registry. $ npx mcp-tdqs score --command "node ./dist/server.js" --fail-under B Code extracts what the schema and annotations already say; a model grades only what the description adds beyond them. Every stage of the pipeline is specified, and the deterministic ones are exact to the digit across implementations. Deterministic code reads the schema and annotations: parameter coverage, output schema, behavioural hints,…from tdqs.dev
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