Witness is a Model Context Protocol (MCP) server: Production proofs for breaking JSON Schema/MCP changes; UNKNOWN/NO_WITNESS_FOUND not compatible. In practice that means any MCP-compatible AI assistant can call Witness's tools directly — the model decides when to use them in a conversation or agent run.
It's a hosted (remote) server — point your client at https://witness-contractwitness-production.witness-test.workers.dev/mcp and you're connected, with nothing to install locally. The current release is v0.3.0.
Witness is listed under Development on mcp.site and works with any MCP client — Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed and the rest of the ecosystem — using the install snippets below. If you maintain Witness for tfitzgerwitness, claim this listing to verify ownership, earn the Verified badge, and keep the details current.