one tool missing from most API doc discussions: MCP (Model Context Protocol) server definitions. if you're building APIs that AI agents consume — and in 2026 that's basically every API — you need a machine-readable spec that goes beyond OpenAPI. MCP configs describe what tools an agent can call, what permissions they need, and how context flows between them. the gap right now is that every team writes their own MCP configs from scratch. been collecting production-tested examples at tokrepo.com as an open registry alongside claude code skills and slash commands.