Created 5 new utility modules in apps/server/src/lib/ to eliminate ~320 lines of duplicated code:
- image-handler.ts: Centralized image processing (MIME types, base64, content blocks)
- prompt-builder.ts: Standardized prompt building with image attachments
- model-resolver.ts: Model alias resolution and provider routing
- conversation-utils.ts: Conversation history processing for providers
- error-handler.ts: Error classification and user-friendly messages
Updated services and providers to use shared utilities:
- agent-service.ts: -51 lines (removed duplicate image handling, model logic)
- auto-mode-service.ts: -75 lines (removed MODEL_MAP, duplicate utilities)
- claude-provider.ts: -10 lines (uses conversation-utils)
- codex-provider.ts: -5 lines (uses conversation-utils)
Added comprehensive documentation:
- docs/server/utilities.md: Complete reference for all 9 lib utilities
- docs/server/providers.md: Provider architecture guide with examples
Benefits:
- Single source of truth for critical business logic
- Improved maintainability and testability
- Consistent behavior across services and providers
- Better documentation for future development
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
