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**Example Analysis:**
```markdown

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1. **Workflow Patterns**
   - YAML config → Script execution → HTML report
   - Data load → Process → Validate → Visualize → Save

2. **Code Patterns**
   - Interactive plotting with Plotly
   - CSV data loading with relative paths
   - Modular calculator structure
   - TDD test-first approach

3. **Tool Patterns**
   - UV environment management
   - Bash script execution
   - YAML configuration files
   - Plotly visualization

4. **Problem-Solving Patterns**
   - NPV calculation with multiple discount rates
   - Handling missing data gracefully
   - Interactive parameter adjustment
   - Real-time visualization updates

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CREATE NEW SKILL if:
✓ Pattern used 3+ times across commits
✓ Workflow is complex (5+ steps)
✓ Domain-specific knowledge required
✓ Significant time savings (>30 min per use)
✓ No existing skill covers it

ENHANCE EXISTING SKILL if:
✓ Pattern similar to existing skill
✓ New technique for known problem
✓ Updated best practices
✓ New tool/library version
✓ Improved approach discovered

SKIP if:
✗ One-time solution
✗ Trivial pattern (<3 steps)
✗ Already well-covered
✗ Repository-specific only

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1. Generate skill name from pattern
2. Extract workflow steps
3. Create SKILL.md with template
4. Document code examples
5. Add usage instructions
6. Link related skills
7. Update skills README
8. Commit new skill

---
name: financial-calculator-builder
description: Build interactive financial calculators (NPV, IRR, ROI) with Plotly visualization, YAML configuration, and HTML reporting.
version: 1.0.0
category: development/finance
created_from: commit a1b2c3d4
pattern_source: npv_calculator implementation
---

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1. **Version Updates**
   - New tool versions (Plotly 5.17 → 5.18)
   - Updated APIs
   - Deprecated method replacements

2. **Best Practice Improvements**
   - Better error handling
   - Performance optimizations
   - Security enhancements

3. **New Examples**
   - Additional use cases
   - Real-world implementations
   - Edge case handling

4. **Integration Points**
   - New tool integrations
   - Cross-skill workflows
   - Automation hooks

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import plotly.graph_objects as go

**Version**: 1.2.0 → 1.3.0
**Reason**: Added financial visualization patterns

.claude/knowledge/
├── patterns/
│   ├── financial-calculations.md
│   ├── interactive-visualization.md
│   └── data-pipelines.md
├── techniques/
│   ├── npv-calculation.md
│   ├── scenario-analysis.md
│   └── sensitivity-testing.md
└── lessons/
    ├── 2026-01-07-npv-calculator.md
    └── ...

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calculation:
  type: npv
  discount_rates: [0.05, 0.08, 0.10, 0.12]
  cash_flows: data/cash_flows.csv
  scenarios:
    - base
    - optimistic
    - pessimistic

class NPVCalculator:
    def calculate(self, cash_flows, discount_rate):
        return np.npv(discount_rate, cash_flows)

    def multi_scenario(self, scenarios, rates):
        results = {}
        for scenario in scenarios:
            for rate in rates:
                npv = self.calculate(scenario.cash_flows, rate)
                results[(scenario.name, rate)] = npv
        return results

./scripts/run_npv_analysis.sh config/npv.yaml

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**Trigger Conditions:**
- After git commit (>50 lines changed)
- After task completion
- After feature merges
- Manual trigger via `/skill-learner`

**Bypass Hook:**
```bash

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#!/bin/bash

# Get commit metadata
local msg=$(git log -1 --pretty=%B $COMMIT_HASH)
local author=$(git log -1 --pretty=%an $COMMIT_HASH)
local date=$(git log -1 --pretty=%ai $COMMIT_HASH)

# Get changed files
local files=$(git diff-tree --no-commit-id --name-only -r $COMMIT_HASH)

# Analyze patterns
extract_patterns "$files"

# Make skill decisions
decide_skill_actions

# Generate report
generate_learning_report

# Check for workflow patterns
if echo "$files" | grep -q "config/input/.*\.yaml"; then
    echo "Pattern: YAML-driven workflow"
fi

if echo "$files" | grep -q "scripts/.*\.sh"; then
    echo "Pattern: Bash execution script"
fi

# Check for code patterns
if git diff $COMMIT_HASH^ $COMMIT_HASH | grep -q "import plotly"; then
    echo "Pattern: Plotly visualization"
fi

# More pattern detection...

# Check commit history for similar patterns
local pattern_count=$(git log --all --grep="similar pattern" | wc -l)
if [ $pattern_count -ge 3 ]; then
    ((score += 30))
fi

# Check code complexity
local lines_added=$(git diff $COMMIT_HASH^ $COMMIT_HASH --shortstat | grep -oE '[0-9]+ insertion' | grep -oE '[0-9]+')
if [ $lines_added -gt 100 ]; then
    ((score += 20))
fi

# Decision
if [ $score -ge 70 ]; then
    echo "Recommendation: CREATE NEW SKILL"
elif [ $score -ge 40 ]; then
    echo "Recommendation: ENHANCE EXISTING SKILL"
else
    echo "Recommendation: SKIP (low reusability)"
fi

{
    echo "# Learning Report"
    echo "**Commit**: $COMMIT_HASH"
    echo "**Date**: $(date)"
    echo ""
    echo "## Patterns Extracted"
    # ... pattern details ...
    echo ""
    echo "## Recommendations"
    # ... recommendations ...
} > "$report_file"

echo "Learning report saved: $report_file"

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#!/bin/bash

# Create SKILL.md
cat > "${skill_dir}/SKILL.md" << EOF

echo "Skill created: $skill_dir"

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#!/bin/bash

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ℹ️ Info: No reusable patterns detected in commit

Reason: Commit too small or repository-specific changes

Action: No skills created, logged for future pattern detection

⚠️ Warning: Skill 'financial-calculator-builder' already exists

Action Options:
1. Enhance existing skill (recommended)
2. Create variant skill (e.g., 'financial-calculator-builder-v2')
3. Skip creation

Recommendation: ENHANCE

❌ Error: Pattern extraction failed

Reason: Unable to identify coherent workflow or technique

Action: Manual review required - see .claude/learning-reports/error-*.md

⚠️ Warning: Skills directory not accessible

Location Expected: ~/.claude/skills/ or .claude/skills/

Action: Create skills directory or configure SKILLS_PATH

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