Verification Gate

Announce: "Using ds-verify (Phase 5) to confirm reproducibility and completion."

Contents

• The Iron Law of DS Verification
• Red Flags - STOP Immediately If You Think
• The Verification Gate
• Verification Checklist
• Reproducibility Demonstration
• Claims Requiring Evidence
• Insufficient Evidence
• Required Output Structure
• Completion Criteria

Verification Gate

Final verification with reproducibility checks and user acceptance interview.

<EXTREMELY-IMPORTANT> ## The Iron Law of DS Verification

NO COMPLETION CLAIMS WITHOUT FRESH VERIFICATION. This is not negotiable.

Before claiming analysis is complete, you MUST:

1. RE-RUN - Execute analysis fresh (not cached results)
2. CHECK - Verify outputs match expectations
3. REPRODUCE - Confirm results are reproducible
4. ASK - Interview user about constraints and acceptance
5. Only THEN claim completion

This applies even when:

• "I just ran it"
• "Results look the same"
• "It should reproduce"
• "User seemed happy earlier"

If you catch yourself thinking "I can skip verification," STOP - you're about to lie. </​EXTREMELY-IMPORTANT>

Red Flags - STOP Immediately If You Think:

The Verification Gate

Before making ANY completion claim:

1. RE-RUN    → Execute fresh, not from cache
2. CHECK     → Compare outputs to success criteria
3. REPRODUCE → Same inputs → same outputs
4. ASK       → User acceptance interview
5. CLAIM     → Only after steps 1-4

Skipping any step is not verification.

Verification Checklist

Technical Verification

Outputs Match Expectations

• All required outputs generated
• Output formats correct (files, figures, tables)
• Numbers are reasonable (sanity checks)
• Visualizations render correctly

Reproducibility Confirmed

• Ran analysis twice, got same results
• Random seeds produce consistent output
• No dependency on execution order
• Environment documented (packages, versions)

Data Integrity

• Input data unchanged
• Row counts traceable through pipeline
• No silent data loss or corruption

User Acceptance Interview

CRITICAL: Before claiming completion, conduct user interview.

Step 1: Replication Constraints

AskUserQuestion:
  question: "Were there specific methodology requirements I should have followed?"
  options:
    - label: "Yes, replicating existing analysis"
      description: "Results should match a reference"
    - label: "Yes, required methodology"
      description: "Specific methods were mandated"
    - label: "No constraints"
      description: "Methodology was flexible"

If replicating:

• Ask for reference to compare against
• Verify results match within tolerance
• Document any deviations and reasons

Step 2: Results Verification

AskUserQuestion:
  question: "Do these results answer your original question?"
  options:
    - label: "Yes, fully"
      description: "Analysis addresses the core question"
    - label: "Partially"
      description: "Some aspects addressed, others missing"
    - label: "No"
      description: "Does not answer the question"

If "Partially" or "No":

1. Ask which aspects are missing
2. Return to /​ds-implement to address gaps
3. Re-run verification

Step 3: Output Format

AskUserQuestion:
  question: "Are the outputs in the format you need?"
  options:
    - label: "Yes"
      description: "Format is correct"
    - label: "Need adjustments"
      description: "Format needs modification"

Step 4: Confidence in Results

AskUserQuestion:
  question: "Do you have any concerns about the methodology or results?"
  options:
    - label: "No concerns"
      description: "Comfortable with approach and results"
    - label: "Minor concerns"
      description: "Would like clarification on some points"
    - label: "Major concerns"
      description: "Significant issues need addressing"

Reproducibility Demonstration

MANDATORY: Demonstrate reproducibility before completion.

# Run 1
result1 = run_analysis(seed=42)
hash1 = hash(str(result1))

# Run 2
result2 = run_analysis(seed=42)
hash2 = hash(str(result2))

# Verify
assert hash1 == hash2, "Results not reproducible!"
print(f"Reproducibility confirmed: {hash1} == {hash2}")

For notebooks:

# notebook-reproduce: Clear and re-run all cells from scratch
jupyter nbconvert --execute --inplace notebook.ipynb

# notebook-reproduce-with-seed: Execute notebook with fixed random seed for reproducibility
papermill notebook.ipynb output.ipynb -p seed 42

Claims Requiring Evidence

Insufficient Evidence

These do NOT count as verification:

• Previous run results (must be fresh)
• "Should be reproducible" (demonstrate it)
• Visual inspection only (quantify where possible)
• Single run (need reproducibility check)
• Skipped user acceptance (must ask)

Required Output Structure

## Verification Report: [Analysis Name]

### Technical Verification

#### Outputs Generated
- [ ] Output 1: [location] - verified [date/​time]
- [ ] Output 2: [location] - verified [date/​time]

#### Reproducibility Check
- Run 1 hash: [value]
- Run 2 hash: [value]
- Match: YES/​NO

#### Environment
- Python: [version]
- Key packages: [list with versions]
- Random seed: [value]

### User Acceptance

#### Replication Check
- Constraint: [none/​replicating/​required methodology]
- Reference: [if applicable]
- Match status: [if applicable]

#### User Responses
- Results address question: [yes/​partial/​no]
- Output format acceptable: [yes/​needs adjustment]
- Methodology concerns: [none/​minor/​major]

### Verdict

**COMPLETE** or **NEEDS WORK**

[If COMPLETE]
- All technical checks passed
- User accepted results
- Reproducibility demonstrated

[If NEEDS WORK]
- [List items requiring attention]
- Recommended next steps

Completion Criteria

Only claim COMPLETE when ALL are true:

• All success criteria from SPEC.md verified
• Results reproducible (demonstrated, not assumed)
• User confirmed results address their question
• User has no major concerns
• Outputs in acceptable format
• If replicating: results match reference

Both technical and user acceptance must pass. No shortcuts.

Workflow Complete

When user confirms all criteria are met:

Announce: "DS workflow complete. All 5 phases passed."

The /​ds workflow is now finished. Offer to:

• Export results to final format
• Clean up .claude/ files
• Start a new analysis with /​ds