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.claude/skills/methodology/sequential-thinking/SKILL.md

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+# Sequential Thinking
+
+## Description
+
+Step-by-step reasoning methodology with explicit evidence collection and confidence tracking. Use for complex problems requiring careful analysis and documented decision-making.
+
+## When to Use
+
+- Complex debugging
+- Architecture decisions
+- Security analysis
+- Performance investigation
+- Any problem with multiple possible causes
+- When decisions need documentation
+
+---
+
+## The Sequential Process
+
+### Step 1: Define the Question
+Clearly state what you're trying to determine.
+
+```markdown
+## Question
+What is causing the authentication timeout for users with special characters in passwords?
+```
+
+### Step 2: Gather Evidence
+Collect all relevant information systematically.
+
+```markdown
+## Evidence Collection
+
+### Evidence 1: Error Logs
+- Source: `logs/auth-service.log`
+- Finding: Timeout occurs at password encoding step
+- Confidence: High (direct observation)
+
+### Evidence 2: Code Review
+- Source: `src/auth/password.ts:42`
+- Finding: URL encoding applied to password
+- Confidence: High (code inspection)
+
+### Evidence 3: Test Results
+- Source: Manual testing
+- Finding: Works with alphanumeric, fails with `@#$`
+- Confidence: High (reproducible)
+```
+
+### Step 3: Form Hypotheses
+Generate possible explanations.
+
+```markdown
+## Hypotheses
+
+### Hypothesis A: URL Encoding Issue
+- Evidence supporting: E1, E2, E3
+- Evidence against: None
+- Probability: 80%
+
+### Hypothesis B: Character Set Mismatch
+- Evidence supporting: E3
+- Evidence against: E2 (UTF-8 used)
+- Probability: 15%
+
+### Hypothesis C: Database Encoding
+- Evidence supporting: None directly
+- Evidence against: E1 (fails before DB)
+- Probability: 5%
+```
+
+### Step 4: Test Hypotheses
+Verify the most likely explanation.
+
+```markdown
+## Testing
+
+### Test for Hypothesis A
+Action: Remove URL encoding, use base64 instead
+Result: Password `test@123` now works
+Conclusion: Hypothesis A confirmed
+```
+
+### Step 5: Document Conclusion
+State the final answer with confidence.
+
+```markdown
+## Conclusion
+
+**Root Cause**: URL encoding in password.ts:42 mangles special characters
+
+**Confidence**: 9/10
+
+**Evidence Chain**:
+1. Timeout at encoding step (logs)
+2. URL encoding in code (review)
+3. Special char passwords fail (testing)
+4. Removing encoding fixes issue (verification)
+
+**Fix**: Replace URL encoding with base64 at line 42
+```
+
+---
+
+## Output Template
+
+```markdown
+# Sequential Analysis: [Problem Description]
+
+## Question
+[Clear statement of what we're investigating]
+
+## Evidence
+
+### Evidence 1: [Title]
+- Source: [where found]
+- Finding: [what it shows]
+- Confidence: [High/Medium/Low]
+
+### Evidence 2: [Title]
+...
+
+## Hypotheses
+
+### Hypothesis A: [Name]
+- Supporting evidence: [list]
+- Contradicting evidence: [list]
+- Probability: [X%]
+
+### Hypothesis B: [Name]
+...
+
+## Testing
+
+### Test 1: [What tested]
+- Action: [what was done]
+- Expected: [what should happen if hypothesis true]
+- Actual: [what happened]
+- Result: [confirms/refutes hypothesis]
+
+## Conclusion
+
+**Answer**: [clear statement]
+**Confidence**: [X/10]
+**Key Evidence**: [most important findings]
+**Recommended Action**: [what to do next]
+```
+
+---
+
+## Confidence Scoring
+
+| Score | Meaning | Evidence Required |
+|-------|---------|-------------------|
+| 9-10 | Certain | Multiple independent confirmations |
+| 7-8 | High | Strong evidence, tested hypothesis |
+| 5-6 | Medium | Good evidence, some uncertainty |
+| 3-4 | Low | Limited evidence, multiple possibilities |
+| 1-2 | Guess | Insufficient evidence |
+
+---
+
+## Anti-Patterns
+
+### Jumping to Conclusions
+```markdown
+❌ "The bug is probably in the database"
+✅ "Let me gather evidence before hypothesizing"
+```
+
+### Confirmation Bias
+```markdown
+❌ Only looking for evidence supporting first guess
+✅ Actively seeking contradicting evidence
+```
+
+### Skipping Documentation
+```markdown
+❌ Fixing without recording reasoning
+✅ Document even simple analysis for future reference
+```
+
+---
+
+## Activation
+
+### Via Mode
+```
+Use mode: deep-research
+```
+
+### Via Command
+```
+Apply sequential thinking to analyze [problem]
+```
+
+### Via Skill Reference
+```
+Use skill: sequential-thinking
+```
+
+---
+
+## Combines Well With
+
+- Deep research mode
+- Systematic debugging skill
+- Root cause tracing skill
+- Security audits
+- Performance investigations
+
+---