learn

name: learn description: Extract reusable patterns from sessions and save them as skills. Use after solving complex problems, discovering useful workarounds, or establishing project-specific conventions. Keywords: learn, pattern, extract, skill, knowledge, save, remember.

Learn Skill

Purpose

Analyze problem-solving patterns, debugging techniques, and workarounds from sessions to save them as reusable skills.

Core Principle: Recurring problem-solving → Pattern extraction → Skill creation → Reuse in future sessions

Activation Triggers

• After solving complex errors
• When discovering useful workarounds
• When establishing project-specific conventions
• Session end knowledge consolidation
• Explicit user request: /learn, remember this, save pattern

Pattern Extraction Focus

Include ✅

Exclude ❌

Workflow

Step 1: Session Analysis

/learn

🔍 Analyzing session...
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Messages: 47
Tool calls: 89
Errors resolved: 3 cases
Main task: Auth system implementation
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Step 2: Pattern Identification

💡 Extractable patterns found
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

1. [HIGH VALUE] NextAuth + Prisma Session Type Extension
   - Problem: userId missing in Session type
   - Solution: Type extension in next-auth.d.ts
   - Reusability: ⭐⭐⭐⭐⭐

2. [MEDIUM VALUE] Supabase RLS Debugging Pattern
   - Problem: Empty results due to RLS policy
   - Solution: Test with service_role key, then fix policy
   - Reusability: ⭐⭐⭐⭐

3. [LOW VALUE] ESLint Rule Disable
   - Problem: unused-vars warning
   - Solution: .eslintrc modification
   - Reusability: ⭐⭐ (project-specific)

Select patterns to save [1,2,3 or all]:

Step 3: Skill Document Generation

📝 Generating skill document...

File: ~/.claude/skills/learned/nextauth-prisma-session-type.md
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# NextAuth + Prisma Session Type Extension

## Problem
Type error when accessing userId in NextAuth session
`Property 'userId' does not exist on type 'Session'`

## Solution
Create `types/next-auth.d.ts`:
\`\`\`typescript
import { DefaultSession } from "next-auth"

declare module "next-auth" {
  interface Session {
    user: {
      id: string
    } & DefaultSession["user"]
  }
}
\`\`\`

## When to Apply
- When using NextAuth + Prisma combination
- When adding custom fields to session

## Related
- NextAuth official docs: TypeScript section
- Prisma adapter configuration
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

✅ Skill saved

Step 4: Confirmation

View saved skill? [y/N]

Learned Skills Storage

Storage Location

~/.claude/skills/learned/
├── nextauth-prisma-session-type.md
├── supabase-rls-debugging.md
├── react-hydration-mismatch-fix.md
└── vercel-edge-function-timeout.md

Skill File Structure

---
name: pattern-name
description: Brief description
learned_at: 2025-01-26
source_project: project-name
tags: [nextauth, prisma, typescript]
---

# Pattern Name

## Problem
Problem situation description

## Cause
Root cause analysis

## Solution
Resolution method (with code examples)

## When to Apply
Situations where this pattern applies

## Caveats
Warnings, edge cases

## Related
Related documentation, resource links

Auto-Learning (Stop Hook)

Automatic Session End Analysis

.claude/settings.json:

{
  "hooks": {
    "Stop": [
      {
        "type": "command",
        "command": "~/.claude/scripts/evaluate-session.sh"
      }
    ]
  }
}

Auto-Learning Configuration

.claude/learn.config.json:

{
  "auto_learn": {
    "enabled": true,
    "min_session_length": 10,
    "extraction_threshold": "medium",
    "auto_approve": false
  },
  "storage": {
    "path": "~/.claude/skills/learned/",
    "max_skills": 100
  },
  "filters": {
    "ignore_patterns": [
      "typo",
      "syntax_error",
      "one_time_fix"
    ],
    "focus_patterns": [
      "error_resolution",
      "debugging_technique",
      "workaround",
      "architecture_decision"
    ]
  }
}

Integration

With PM Agent

Integration with PM Agent's self-improvement layer:

Session complete
    │
    ├─→ /learn (pattern extraction)
    │
    └─→ PM Agent (documentation, knowledge base update)

With /checkpoint

/checkpoint create "before-experiment"
... experimental resolution attempts ...
... success! ...
/learn  # Save successful pattern

With Future Sessions

Saved skills auto-referenced when similar problems occur:

🔍 Similar pattern detected
━━━━━━━━━━━━━━━━━━━━━━━━━━
Previously learned pattern available:
- nextauth-prisma-session-type.md

Apply? [y/N]

Quality Filters

Value Assessment

Extraction Threshold

• Low: Extract most patterns (noisy)
• Medium: Medium+ value only (recommended)
• High: High-value patterns only (strict)

Commands

Best Practices

Good Pattern Example

# React Server Component Data Fetching

## Problem
Waterfall issue when fetching server data
in client components

## Solution
Fetch data in server component, pass as props
or use Suspense + parallel fetch

## Code Example
\`\`\`tsx
// ✅ Good: Server Component
async function Page() {
  const data = await fetchData()
  return <ClientComponent data={data} />
}
\`\`\`

Pattern to Avoid

# Fix Typo in Config  ❌
## Problem
Build failure due to typo
## Solution
Fix typo

→ No reuse value, do not save