CODITECT Development Studio - Architecture Requirements Document (ARD) v2.0
Version: 2.0.0
Date: 2026-01-31
Status: Draft
Changes: Unified persistent workspace, GCS storage, SQLite databases, in-workspace multi-agent coordination
1. Introduction
1.1 Purpose
This document defines the architectural requirements for CODITECT Development Studio v2.0, a browser-based thin client with unified persistent workspaces supporting multi-agent AI collaboration.
1.2 Scope Changes from v1.0
| Aspect | v1.0 | v2.0 |
|---|---|---|
| Compute | 4 ephemeral sandboxes | 1 persistent workspace |
| Session Model | 30-min timeout | 8-hour renewable |
| Storage | R2 snapshots | GCS FUSE + R2 mirror |
| State | Durable Objects | SQLite cluster + JSONL |
| Coordination | External routing | In-workspace orchestrator |
1.3 Definitions
| Term | Definition |
|---|---|
| Workspace | Persistent container with 4 coordinated agents |
| Agent | LLM instance (Claude, Gemini, Codex, Kimi) in workspace |
| SQLite Cluster | 6 SQLite databases with WAL mode |
| GCS FUSE | Filesystem mount of Google Cloud Storage |
| Session JSONL | Append-only event log for audit trail |
2. Stakeholder Requirements
2.1 Stakeholder Matrix
| Stakeholder | Concerns | Priority |
|---|---|---|
| End Users | Zero cold start, persistent sessions | Critical |
| Enterprise | Data durability, audit trails | Critical |
| Platform Team | Cost at scale, maintainability | High |
| Security | Encryption, isolation, compliance | Critical |
| Finance | Unit economics, predictability | High |
2.2 User Personas
Persona 1: Multi-Agent Developer (Alex)
- Role: Senior developer using multiple LLMs simultaneously
- Needs: See all agents working, share context, no interruptions
- Pain Points: Session timeouts, lost context, cold starts
- Requirements: Persistent workspace, agent activity panel, file locks
Persona 2: Engineering Lead (Maria)
- Role: Manages team of 20 developers
- Needs: Cost visibility, resource controls, audit trails
- Pain Points: Unpredictable costs, no visibility into usage
- Requirements: Per-workspace billing, SQLite analytics, JSONL audit logs
3. Functional Requirements
3.1 Workspace Management (NEW v2.0)
| ID | Requirement | Priority | Acceptance Criteria |
|---|---|---|---|
| FR-WS-001 | Persistent workspace provisioning | Critical | < 30s from request to ready |
| FR-WS-002 | Zero cold start | Critical | < 1s reconnect to existing workspace |
| FR-WS-003 | Workspace hibernation | High | Auto-sleep after 8h inactivity |
| FR-WS-004 | Workspace restoration | Critical | < 5s resume from hibernation |
| FR-WS-005 | GCS FUSE mount | Critical | /projects mounted from GCS bucket |
| FR-WS-006 | SQLite cluster initialization | Critical | 6 databases ready on provision |
| FR-WS-007 | Multi-region workspaces | Medium | Deploy to nearest region |
| FR-WS-008 | Workspace transfer | Low | Migrate between regions |
3.2 Multi-Agent Coordination (NEW v2.0)
| ID | Requirement | Priority | Acceptance Criteria |
|---|---|---|---|
| FR-AGENT-001 | 4 agents in single workspace | Critical | Claude, Gemini, Codex, Kimi coexist |
| FR-AGENT-002 | Agent status visibility | Critical | Real-time: idle/executing/waiting/error |
| FR-AGENT-003 | File lock management | Critical | Prevent concurrent edits on same file |
| FR-AGENT-004 | Task queue | High | FIFO queue per agent with priority |
| FR-AGENT-005 | Agent-to-agent messaging | Medium | Broadcast messages between agents |
| FR-AGENT-006 | Shared context | High | Common codebase view for all agents |
| FR-AGENT-007 | Agent resource limits | High | Per-agent CPU/memory quotas |
| FR-AGENT-008 | Agent failover | Medium | Auto-restart agent on crash |
3.3 SQLite Database Cluster (NEW v2.0)
| ID | Requirement | Priority | Acceptance Criteria |
|---|---|---|---|
| FR-DB-001 | 6-database cluster | Critical | sessions, messages, artifacts, parsed, metrics, idx |
| FR-DB-002 | WAL mode | Critical | Write-Ahead Logging enabled |
| FR-DB-003 | GCS sync | Critical | WAL files sync to GCS every 30s |
| FR-DB-004 | Query interface | High | SQL queries via WebSocket |
| FR-DB-005 | Real-time subscriptions | Medium | Listen for database changes |
| FR-DB-006 | Backup/restore | High | Point-in-time restore capability |
| FR-DB-007 | Connection pooling | Medium | Max 10 concurrent connections |
| FR-DB-008 | Migration support | High | Schema versioning and migrations |
3.4 Session JSONL Archive (NEW v2.0)
| ID | Requirement | Priority | Acceptance Criteria |
|---|---|---|---|
| FR-JSONL-001 | Append-only event log | Critical | Every action logged with timestamp |
| FR-JSONL-002 | Event types | Critical | file_edit, agent_message, tool_call, checkpoint |
| FR-JSONL-003 | GCS persistence | Critical | Sync to GCS every 5s |
| FR-JSONL-004 | Streaming read | High | Efficient replay of session |
| FR-JSONL-005 | Compaction | Medium | Archive old events monthly |
| FR-JSONL-006 | Search | Medium | Full-text search across events |
3.5 Authentication & Authorization (Enhanced v2.0)
| ID | Requirement | Priority | Acceptance Criteria |
|---|---|---|---|
| FR-AUTH-001 | SSO via SAML 2.0 | Critical | Okta, Azure AD, Auth0 |
| FR-AUTH-002 | SSO via OIDC | Critical | OAuth 2.0 / OpenID Connect |
| FR-AUTH-003 | API key authentication | High | Programmatic access |
| FR-AUTH-004 | Multi-factor authentication | High | TOTP, WebAuthn |
| FR-AUTH-005 | RBAC | Critical | Admin, Developer, Viewer |
| FR-AUTH-006 | Workspace-level permissions | High | Per-workspace access control |
| FR-AUTH-007 | Agent-level permissions | Medium | Restrict which LLMs user can access |
3.6 Multi-Tenancy (Enhanced v2.0)
| ID | Requirement | Priority | Acceptance Criteria |
|---|---|---|---|
| FR-MT-001 | Organization isolation | Critical | GCS prefix per org |
| FR-MT-002 | Team workspaces | Critical | Sub-org team structure |
| FR-MT-003 | Workspace quotas | High | CPU, memory, storage per workspace |
| FR-MT-004 | Billing per workspace | High | Track usage per workspace |
| FR-MT-005 | Custom domains | Medium | workspace.team.org.coditect.dev |
3.7 Chat & Agent Interface (Enhanced v2.0)
| ID | Requirement | Priority | Acceptance Criteria |
|---|---|---|---|
| FR-CHAT-001 | Real-time chat | Critical | WebSocket streaming |
| FR-CHAT-002 | Multi-agent chat | Critical | All 4 agents visible |
| FR-CHAT-003 | Agent targeting | High | Send message to specific agent |
| FR-CHAT-004 | Agent broadcast | Medium | Send to all agents |
| FR-CHAT-005 | Message history from SQLite | Critical | Query from messages.db |
| FR-CHAT-006 | Tool call visualization | High | Show progress in UI |
| FR-CHAT-007 | File lock indicators | High | Show which agent has file |
3.8 File Management (Enhanced v2.0)
| ID | Requirement | Priority | Acceptance Criteria |
|---|---|---|---|
| FR-FILE-001 | File tree with locks | Critical | Lock icon + agent name |
| FR-FILE-002 | GCS-backed files | Critical | Persisted to GCS FUSE |
| FR-FILE-003 | Auto-save | High | Debounced save to GCS |
| FR-FILE-004 | Git integration | Critical | Status, diff, commit |
| FR-FILE-005 | Collaborative indicators | High | Show other agents' cursors |
4. Non-Functional Requirements
4.1 Performance (Updated v2.0)
| ID | Requirement | Target | Measurement |
|---|---|---|---|
| NFR-PERF-001 | Workspace startup | < 30s | First provision |
| NFR-PERF-002 | Workspace reconnect | < 1s | Reconnect to existing |
| NFR-PERF-003 | Agent task start | < 500ms | From queue to execution |
| NFR-PERF-004 | File lock acquisition | < 100ms | Lock granted |
| NFR-PERF-005 | SQLite query | < 50ms | Simple SELECT |
| NFR-PERF-006 | GCS read | < 200ms | Cached file |
| NFR-PERF-007 | GCS write | < 500ms | File sync |
| NFR-PERF-008 | JSONL append | < 10ms | Local buffer |
| NFR-PERF-009 | Concurrent workspaces | 1,000 | Per region |
4.2 Data Durability (NEW v2.0)
| ID | Requirement | Target | Measurement |
|---|---|---|---|
| NFR-DUR-001 | SQLite durability | 99.999% | WAL + GCS sync |
| NFR-DUR-002 | GCS durability | 99.999999999% | 11 nines |
| NFR-DUR-003 | JSONL completeness | 100% | Zero event loss |
| NFR-DUR-004 | RPO | < 30s | Max data loss |
| NFR-DUR-005 | Checkpoint frequency | 5 min | Auto-checkpoint |
4.3 Scalability (Updated v2.0)
| ID | Requirement | Description |
|---|---|---|
| NFR-SCALE-001 | Workspaces per region | 10,000 active |
| NFR-SCALE-002 | Agents per workspace | 4 (fixed) |
| NFR-SCALE-003 | SQLite size | 10GB per workspace |
| NFR-SCALE-004 | GCS bucket size | Unlimited |
| NFR-SCALE-005 | JSONL per workspace | 1TB |
4.4 Availability (Updated v2.0)
| ID | Requirement | Target |
|---|---|---|
| NFR-AVAIL-001 | Workspace uptime | 99.9% |
| NFR-AVAIL-002 | SQLite availability | 99.99% |
| NFR-AVAIL-003 | GCS availability | 99.9% |
| NFR-AVAIL-004 | Agent recovery | < 30s |
| NFR-AVAIL-005 | Workspace migration | < 5 min |
4.5 Security (Enhanced v2.0)
| ID | Requirement | Standard |
|---|---|---|
| NFR-SEC-001 | GCS encryption | CMEK (Customer-Managed) |
| NFR-SEC-002 | SQLite encryption | SQLCipher |
| NFR-SEC-003 | JSONL encryption | AES-256-GCM |
| NFR-SEC-004 | Workspace isolation | Container + network policies |
| NFR-SEC-005 | Agent sandboxing | seccomp, AppArmor |
4.6 Cost Optimization (NEW v2.0)
| ID | Requirement | Target |
|---|---|---|
| NFR-COST-001 | Cost per user @ 1K | <$7/month |
| NFR-COST-002 | Hibernation savings | 70% reduction |
| NFR-COST-003 | GCS lifecycle | Auto-archive to Nearline |
| NFR-COST-004 | R2 cache efficiency | 80% hit rate |
5. Constraints
5.1 Technical Constraints (Updated v2.0)
| ID | Constraint | Impact |
|---|---|---|
| CONS-001 | GCS FUSE latency | ~10ms overhead per operation |
| CONS-002 | SQLite WAL size | Max 4GB per WAL file |
| CONS-003 | Container memory | Max 8GB per workspace |
| CONS-004 | Container CPU | Max 4 vCPU per workspace |
| CONS-005 | GCS rate limits | 1000 req/s per bucket |
| CONS-006 | WebSocket per DO | Max 1000 concurrent |
5.2 Business Constraints
| ID | Constraint | Impact |
|---|---|---|
| CONS-007 | Budget | $70K/month at 10K users |
| CONS-008 | Timeline | 14 weeks to GA |
| CONS-009 | Migration | Zero downtime from v1.0 |
6. Quality Attributes
6.1 Quality Attribute Priorities (Updated v2.0)
| Attribute | Priority | Rationale |
|---|---|---|
| Data Durability | Critical | Persistent workspace promise |
| Availability | Critical | Always-on development environment |
| Performance | Critical | IDE responsiveness |
| Security | Critical | Multi-tenant isolation |
| Cost Efficiency | High | Sustainable at scale |
| Maintainability | Medium | Operational complexity |
6.2 Quality Scenarios
QA-1: Workspace Persistence
Scenario: User closes laptop overnight
Stimulus: 12-hour disconnection
Environment: Production
Response: Workspace hibernates after 8h, resumes on reconnect
Measure: Zero data loss, < 5s resume time
QA-2: Multi-Agent Coordination
Scenario: 4 agents edit same codebase
Stimulus: Concurrent file operations
Environment: Production
Response: File locks prevent conflicts, queue ensures ordering
Measure: Zero file corruption, < 100ms lock acquisition
QA-3: Database Recovery
Scenario: Container crashes during write
Stimulus: SIGKILL during SQLite transaction
Environment: Production
Response: WAL replay on restart, GCS sync verification
Measure: RPO < 30s, automatic recovery
QA-4: Cost Spike
Scenario: 10x traffic spike
Stimulus: Viral adoption event
Environment: Production
Response: Auto-sleep idle workspaces, scale GCS
Measure: Cost per user stays <$7
7. Compliance & Audit
7.1 Audit Requirements (Enhanced v2.0)
| ID | Requirement | Implementation |
|---|---|---|
| AUDIT-001 | Immutable event log | JSONL append-only |
| AUDIT-002 | Agent actions | Logged to agent_metrics.db |
| AUDIT-003 | File access | workspace_idx.db tracking |
| AUDIT-004 | Session replay | JSONL stream replay |
| AUDIT-005 | Compliance export | SQLite dump + JSONL export |
Document Status: Draft - Awaiting review
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