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+# Documentation index
+
+| Document | Purpose |
+|----------|---------|
+| [DESIGN_PLAN.md](DESIGN_PLAN.md) | Approved architecture + implementation plan |
+| [../design/use-cases.md](../design/use-cases.md) | Use-case catalog (SSOT) |
+| [../design/scenarios.md](../design/scenarios.md) | Narrative scenarios |
+| [../design/DECISIONS.md](../design/DECISIONS.md) | Resolved decisions |
+
+## Planned at build time (not yet written)
+
+Per design plan workstreams: `DEPLOYER_HOST.md`, `INSTALL.md`, `UPGRADE.md`, `HERMES_MODELS.md`, `ARCHITECTURE.md`, `POLICY.md`, `SETUP_UX.md`, provider/MCP operator guides.