Implementation Learnings Format

Reference for Step 10 of build-task-workflow-manager. Defines what to capture and how to format it for AGENTS.md.

What to Capture

Patterns

Conventions that emerged consistently across 2+ modified files:

• Import organization (grouping, ordering)
• Naming conventions (methods, variables, files)
• File structure patterns (where things go)
• Code organization (module boundaries, layering)

Gotchas

Non-obvious requirements discovered during build or fix loop:

• Hidden dependencies between components
• Ordering constraints not documented
• Framework quirks requiring workarounds
• Environment-specific behaviors

Anti-Patterns

Approaches that failed during the fix loop (only when ATTEMPTS > 1):

• What was tried and failed
• Why it failed
• What worked instead

Output Format

Append to the nearest AGENTS.md, organized by type:

## Patterns

| Pattern | Location |
|---------|----------|
| Consistent import grouping: stdlib, gems, app | `app/services/` |
| Form objects inherit from ApplicationForm | `app/forms/` |

## Gotchas

- ActiveJob must be configured before Turbo broadcasts work — missing config causes silent failures
- Stimulus controller names must match filename exactly — no aliases

## Anti-Patterns

| Don't | Why | Do Instead |
|-------|-----|------------|
| Inline SQL in controllers | Breaks when schema changes | Use scope methods on model |
| Skip N+1 checks in dev | Explodes in production | Use strict_loading or bullet gem |

Rules

• Dedupe: Compare against existing AGENTS.md content before appending
• Skip when: No files modified, all learnings already documented, or trivial changes only
• Location: Walk up from primary modified directory until AGENTS.md found (fallback: root)
• Merge: Append to existing sections if they exist, create new sections if not