Tandem | Governance runtime for AI agents

# Tandem > Tandem is an AI agent authority runtime for risk-tiered actions. It applies step-level policy to scoped MCP tools, pauses consequential actions for human-in-the-loop (HITL) approval, resumes them with durable context, and preserves protected audit evidence. ## Primary entry points - https://tandem.ac/ - Human homepage for the product explanation and demo. - https://tandem.ac/mcp - Tandem Docs MCP endpoint for structured docs search and retrieval. - https://tandem.ac/codex-plugin - Tandem Codex Plugin landing page with install commands and workflow authoring loop. - https://docs.tandem.ac - Full documentation site. - https://github.com/frumu-ai/tandem - Source repository. - https://github.com/frumu-ai/tandem-codex-plugin - Codex plugin repository. ## Hosted and enterprise product surfaces - https://tandem.ac/hosted - Hosted Tandem surface for managed/private runtime deployments. - https://tandem.ac/hosted/aca - Explainer for ACA (Autonomous Coding Agent), the structured coding-run control plane bundled on every hosted server. - https://tandem.ac/hosted/knowledgebase - Explainer for the Knowledgebase MCP, the per-server retrieval-only MCP that turns uploaded docs into agent-ready collections. ## Homepage anchors - https://tandem.ac/#problem - Concrete agent-risk scenario. - https://tandem.ac/#how-it-works - Diagram of the split between model intelligence and runtime authority. - https://tandem.ac/#controls - Tools, data, approval, and audit controls. - https://tandem.ac/#survives - Durable run state, restart, and audit evidence. - https://tandem.ac/#vendor-independence - Vendor-independence argument. - https://tandem.ac/#status - Shipped controls and roadmap items. - https://tandem.ac/#licensing - Open-core licensing summary. - https://tandem.ac/#contact - Demo, docs, and contact CTA. ## Docs MCP connection block Endpoint: https://tandem.ac/mcp Transport: MCP over HTTP Tools available: search_docs, get_doc, get_tandem_guide, recommend_next_docs, an