Largest Census of MCP Tool Parameter Schemas Released: 229,827 Records

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A new dataset has been published cataloging 229,827 tool records from the Model Context Protocol (MCP) ecosystem, each including a machine-readable input schema describing its parameters. The records draw from 13,120 servers that expose tool-level schemas, out of 42,163 servers surveyed, with most deployed servers lacking such machine-readable parameter definitions. The publisher reports byte-verified counts, no malformed records, and SHA-256 anchoring so the bundle can be independently checked. The dataset is intended to support security research, conformance test generation, and analysis of parameter-level risks such as injection and exfiltration, and is released under a CC-BY-SA-4.0 license. Its authors note that sampling is weighted toward English-language servers and that schema quality varies, with about 29,000 servers without tool-level schemas recorded but not expanded.

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