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Product Requirements Document for Kun

Product Requirements Document

Overview

This document outlines the functional and non-functional requirements for Kun, the Remote AI Development Infrastructure.

Functional Requirements

FR-1: Remote Access

IDRequirementPriority
FR-1.1System SHALL provide VPN-based remote accessP0
FR-1.2System SHALL support SSH over TailscaleP0
FR-1.3System SHALL allow mobile device connectivityP0
FR-1.4System SHALL maintain persistent sessionsP0

FR-2: Session Management

IDRequirementPriority
FR-2.1System SHALL provide tmux-based sessionsP0
FR-2.2Sessions SHALL survive network disconnectsP0
FR-2.3Sessions SHALL persist across rebootsP1
FR-2.4System SHALL support multiple named sessionsP1

FR-3: AI Integration

IDRequirementPriority
FR-3.1System SHALL provide Claude Code CLIP0
FR-3.2AI SHALL have access to pattern libraryP0
FR-3.3AI SHALL follow CLAUDE.md constraintsP0
FR-3.4System SHALL support API key managementP0

FR-4: Multi-User (Phase 2)

IDRequirementPriority
FR-4.1System SHALL support 10+ concurrent usersP1
FR-4.2Users SHALL have isolated home directoriesP1
FR-4.3System SHALL enforce per-user access controlsP1
FR-4.4Configuration SHALL be shared across usersP1

FR-5: Commercial (Phase 3)

IDRequirementPriority
FR-5.1System SHALL provide Docker isolationP2
FR-5.2System SHALL meter resource usageP2
FR-5.3System SHALL integrate billing (Stripe)P2
FR-5.4System SHALL support pattern marketplaceP2

Non-Functional Requirements

NFR-1: Performance

IDRequirementTarget
NFR-1.1SSH connection latency< 200ms
NFR-1.2Session resume time< 2s
NFR-1.3Claude response time< 5s

NFR-2: Reliability

IDRequirementTarget
NFR-2.1System uptime99.9%
NFR-2.2Session persistence7+ days
NFR-2.3Data durabilityNo data loss

NFR-3: Security

IDRequirementTarget
NFR-3.1Zero-trust networkTailscale VPN
NFR-3.2Certificate-based authTailscale SSH
NFR-3.3Encrypted secrets1Password/Vault
NFR-3.4Audit loggingAll access logged

NFR-4: Scalability

IDRequirementTarget
NFR-4.1Phase 1 users1-3
NFR-4.2Phase 2 users10+
NFR-4.3Phase 3 users50+

Acceptance Criteria

Phase 1 Acceptance

  • Developer can SSH to server from laptop
  • Developer can SSH to server from phone (Termius)
  • tmux sessions persist across disconnects
  • Claude Code works in terminal
  • Pattern library is accessible

Phase 2 Acceptance

  • 10 developers can connect simultaneously
  • Each developer has isolated home directory
  • Shared CLAUDE.md is readable by all
  • ACLs restrict access appropriately
  • Netdata monitoring is accessible

Phase 3 Acceptance

  • Docker containers isolate users
  • Usage is metered accurately
  • Billing integration works
  • Patterns can be published/purchased