Show HN: An open dataset of MCP tool definitions and every change to them

Category: security

Tags: mcp, transparency-log, security, merkle-tree, dataset, prompt-injection

Score: 7.3/10 (Innovation: 7, Technical: 8, Documentation: 8, Utility: 6)

HISTOR is a public transparency log for MCP tool definitions that crawls the official MCP registry, digests tool sets, signs labels with AWR/2, and appends them to an RFC 9162 Merkle log. It fills a real security gap in MCP by making tool definition changes auditable and allowing clients to verify they received the same tools others saw.

Target audience: security engineers, backend developers, AI/ML engineers working with MCP

Repository: https://histor.modelmarket.dev/datasets/ · Python · MIT · 1 stars

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