# Design Documents

Technical design documents for major Mosaic Stack features.

## Purpose

Design documents serve as:

- **Blueprints** for implementation
- **Reference** for architectural decisions
- **Communication** between team members
- **Historical record** of design evolution

## Document Structure

Each design document should include:

1. **Problem Statement** — What are we solving?
2. **Architecture Overview** — High-level design with diagrams
3. **Database Schema** — Tables, indexes, relationships
4. **API Specifications** — Endpoints, request/response formats
5. **Implementation Plan** — Phased rollout with milestones
6. **Security & Performance** — Considerations and constraints

## Documents

### [Agent Orchestration Layer](./agent-orchestration.md)

**Status:** Design Phase  
**Version:** 1.0  
**Date:** 2025-01-29

Infrastructure for persistent task management and autonomous agent coordination. Enables long-running background work independent of user sessions.

**Key Features:**

- Task queue with priority scheduling
- Agent health monitoring and automatic recovery
- Checkpoint-based resumption for interrupted work
- Multi-workspace coordination with row-level security

---

### [Knowledge Module](./knowledge-module.md)

**Status:** Design Phase  
**Version:** 1.0  
**Date:** 2025-01-29  
**Issues:** [Implementation Tracker](./knowledge-module-issues.md)

Native knowledge management with wiki-style linking, semantic search, and graph visualization. Enables teams and agents to capture, connect, and query organizational knowledge.

**Key Features:**

- Wiki-style `[[links]]` between entries
- Full-text and semantic (vector) search
- Interactive knowledge graph visualization
- Version history with diff view
- Tag-based organization

---

## Contributing

When creating a new design document:

1. Copy the structure from an existing document
2. Use ASCII diagrams for architecture (keep them simple)
3. Include code examples in TypeScript
4. Specify database schema in SQL (PostgreSQL dialect)
5. Add implementation phases with clear milestones
6. Update this README with a summary

---

### [Federation Architecture](./federation-architecture.md)

**Status:** Design Phase  
**Version:** 0.0.1  
**Date:** 2025-01-29

Multi-instance federation enabling cross-organization collaboration, work/personal separation, and enterprise control with data sovereignty.

**Key Features:**

- Peer-to-peer federation (every instance can be master and/or spoke)
- Authentik integration for enterprise SSO and RBAC
- Agent Federation Protocol for cross-instance queries and commands
- Data sovereignty (query in place, never replicate)
- Single pane of glass aggregating multiple instances

---

### [Multi-Tenant RLS](./multi-tenant-rls.md)

**Status:** Implemented  
**Version:** 1.0  
**Date:** 2025-01-29

PostgreSQL Row-Level Security for workspace isolation and defense-in-depth multi-tenancy.

---

## Contributing

When creating a new design document:

1. Copy the structure from an existing document
2. Use ASCII diagrams for architecture (keep them simple)
3. Include code examples in TypeScript
4. Specify database schema in SQL (PostgreSQL dialect)
5. Add implementation phases with clear milestones
6. Update this README with a summary

---

**Last Updated:** 2025-01-29