# Phase 11, Sprint 3: Code Review Tasks (Step 4)
**Sprint**: Default Model System - Step 4: CLI Integration
**Review Date**: 2025-12-19
**Status**: ✅ Implemented
---
## Summary
1 suggestion received from automated code review.
- **1 ACCEPTED** - Aligns with "fail loudly" principle
---
## ACCEPTED Suggestions
### Suggestion #1: Runtime Validation for DI Call Order
**Priority**: Medium | **Effort**: Low
**Context**: During Step 4 implementation, we discovered and fixed a critical bug where `integrateConfigurationServices` was incorrectly calling `registerConfigurationServices(container)` without the correct `userConfigPath`, causing config to be read from the wrong file (`./config.yaml` instead of `~/.folder-mcp/config.yaml`).
The fix removed the redundant call and added comments explaining the dependency. However, comments alone don't prevent future misconfiguration.
**Problem**: If a developer refactors DI setup and calls `integrateConfigurationServices` before `registerConfigurationServices`, they get a generic "service not registered" error instead of a clear, actionable message.
**Suggested Fix**: Add runtime validation at the start of `integrateConfigurationServices`:
```typescript
export function integrateConfigurationServices(container: DependencyContainer): void {
// Fail loudly if prerequisite not met
if (!container.isRegistered(CONFIG_SERVICE_TOKENS.CONFIG_MANAGER)) {
throw new Error(
'integrateConfigurationServices requires registerConfigurationServices to be called first ' +
'with the correct userConfigPath (e.g., ~/.folder-mcp/config.yaml). ' +
'See src/di/setup.ts for correct usage.'
);
}
// ... rest of function
}
```
**Why this aligns with our principles**:
- **"Fail loudly"**: Catches misconfiguration immediately with actionable error
- **Defensive coding**: Prevents regression of the bug we just fixed
- **Better DX**: Clear error message tells developer exactly what to do
| File | Change |
|------|--------|
| `src/config/di-setup.ts:121` | Add runtime check for CONFIG_MANAGER registration |
---
## Implementation Notes
**Check if container has `isRegistered` method**: May need to use try/catch with `resolve` instead if container doesn't have this method.
**Alternative implementation** (if no `isRegistered` method):
```typescript
try {
container.resolve(CONFIG_SERVICE_TOKENS.CONFIG_MANAGER);
} catch {
throw new Error('integrateConfigurationServices requires registerConfigurationServices...');
}
```
---
## Files Affected
| File | Changes |
|------|---------|
| `src/config/di-setup.ts` | Add runtime validation guard |
---
## Change Log
| Date | Change | Author |
|------|--------|--------|
| 2025-12-19 | Step 4 code review evaluation | Claude |
| 2025-12-19 | Implemented runtime validation guard in `integrateConfigurationServices` | Claude |
