63 MCP tools, 4 agents, 7 sweepers. CKS gives LLMs a verifiable, self-maintaining knowledge backbone: validate, evolve, branch, merge, self-heal graphs. Detects contradictions, stale facts, outdated graphs. Agents resolve them autonomously. Offline search, plugins, SQLite/Postgres, backup, HTTP transport. 2 000+ tests. Zero API keys. Install: pip install cks-mcp