Versioning Constitutions

Core Principle

Constitution versions are immutable snapshots of architectural truth.

When foundational rules change (patterns, tech stack, architecture), create a new version rather than editing in place. This preserves history, enables rollback, and makes changes explicit.

When to Use This Skill

ALWAYS create a new version when:

• Adding a new mandatory pattern (e.g., adopting effect-ts for error handling)
• Removing OR relaxing a mandatory pattern (e.g., making next-safe-action optional)
• Changing tech stack (e.g., migrating from Prisma to Drizzle)
• Updating architectural boundaries (e.g., adding new layer)
• Deprecating rules that are no longer valid
• Major library version changes with breaking patterns (e.g., Next.js 15 → 16)

CRITICAL: Removing or relaxing a mandatory pattern ALWAYS requires a new version, even if existing code would still work. "Non-breaking" is not sufficient - any change to mandatory patterns needs versioning for audit trail.

Do NOT use for:

• Fixing typos or clarifying existing rules (edit current version directly)
• Adding examples to existing patterns (edit current version directly)
• Project-specific implementation details (those go in specs/)

Test for Constitutionality:

Before adding content to constitution, ask: "If we violate this rule, does the architecture break?"

• ✅ Constitutional: "Must use next-safe-action" → violating breaks type safety & validation
• ❌ Not constitutional: "Forms should have wrapper, fields, button" → violating just looks different

Constitution = Architectural rules. Specs = Implementation patterns.

Process

Step 1: Determine Version Number

Read docs/constitutions/current/meta.md to get current version.

Version increment rules:

• Increment by 1 (v1 → v2, v2 → v3)
• No semantic versioning (major.minor.patch)
• Sequential only

Step 2: Create New Version Directory

# Create new version directory
mkdir -p docs/constitutions/v{N}

# Copy structure from current
cp docs/constitutions/current/*.md docs/constitutions/v{N}/

Step 3: Update Content

Edit files in new version directory with changes:

• meta.md - Update version number, date, changelog
• architecture.md - Update if architectural boundaries changed
• patterns.md - Update if mandatory patterns changed
• tech-stack.md - Update if libraries added/removed
• schema-rules.md - Update if database philosophy changed
• testing.md - Update if testing requirements changed

Critical - Minimal Changes Only:

• Only change what NEEDS changing for this version
• NO reorganizing sections ("while I'm here")
• NO reformatting code examples
• NO alphabetizing lists
• NO renaming headings for style
• NO creating new categories unless absolutely required

The diff should show ONLY the substantive change, not stylistic improvements.

Step 4: Update Symlink

# Remove old symlink
rm docs/constitutions/current

# Create new symlink pointing to new version
ln -s v{N} docs/constitutions/current

Step 5: Verify References

Check that all references still work:

# Find all references to constitutions
grep -r "@docs/constitutions/current" .claude/
grep -r "docs/constitutions/current" .claude/

All references should use current/ symlink, never hardcoded versions.

Step 6: Document in meta.md

MANDATORY: Update meta.md with complete documentation:

• New version number (e.g., "Version: 2")
• Creation date (e.g., "Created: 2025-01-17")
• Previous version reference (e.g., "Previous: v1")
• Summary of WHAT changed (e.g., "Removed Redux prohibition")
• Rationale for WHY (e.g., "React Server Components handle all state needs, Redux adds complexity without benefit")

The WHY is critical. In 6 months, the context will be lost. Document:

• What problem does this change solve?
• What decision or discussion led to this?
• Why now vs earlier/later?

DO NOT rely on git commit messages or external docs. meta.md must be self-contained.

Quality Checklist

Before updating symlink:

• New version directory exists at docs/constitutions/v{N}/
• All 6 files present (meta, architecture, patterns, tech-stack, schema-rules, testing)
• meta.md has correct version number and changelog
• Changes documented with rationale (why, not just what)
• Old version remains untouched (immutable)
• References in commands use current/ not v{N}/

Common Mistakes

Mistake 1: Editing Current Version for Breaking Changes

Wrong: Edit docs/constitutions/current/patterns.md directly when removing next-safe-action requirement

Right: Create v2, update patterns.md in v2, update symlink

Why: Breaking changes need versioning. Commands/specs may reference old patterns.

Mistake 2: Hardcoding Version in References

Wrong: @docs/constitutions/v2/architecture.md

Right: @docs/constitutions/current/architecture.md

Why: When v3 is created, all references break. Symlink abstracts version.

Mistake 3: Reorganizing for Style

Wrong: "Let me alphabetize sections and rename files while versioning"

Right: Only change content that needs substantive updates

Why: Gratuitous changes obscure what actually changed. Diff should show real changes.

Mistake 4: Forgetting to Update meta.md

Wrong: Copy files, update content, update symlink, done

Right: Update meta.md with version, date, and changelog

Why: Future you won't remember why version changed. Document the why.

Mistake 5: Versioning Implementation Details

Wrong: Create v2 because we changed button component structure

Right: Constitution = foundational rules only. Implementation goes in specs/

Why: Constitution is for patterns/architecture/stack, not implementation choices.

Mistake 6: Rationalizing In-Place Edits

Wrong: "This change is non-breaking, so I can edit v1 in-place per the meta.md guidance"

Right: Removing/relaxing ANY mandatory pattern requires versioning, even if "non-breaking"

Why: Audit trail matters more than technical breaking changes. Future readers need to know WHEN rules changed, not just that they did. Git history is not sufficient - constitution versions create explicit snapshots.

Quick Reference

# Check current version
cat docs/constitutions/current/meta.md

# Create new version
mkdir -p docs/constitutions/v{N}
cp docs/constitutions/current/*.md docs/constitutions/v{N}/

# Edit content
# Update meta.md, then other files as needed

# Update symlink
rm docs/constitutions/current
ln -s v{N} docs/constitutions/current

# Verify
ls -la docs/constitutions/current
grep -r "constitutions/v[0-9]" .claude/  # Should return nothing

Example: Adding New Pattern

Scenario: We're adopting effect-ts for error handling and deprecating throw/catch.

Step 1: Current version is v1 (read meta.md)

Step 2: Create v2

mkdir -p docs/constitutions/v2
cp docs/constitutions/current/*.md docs/constitutions/v2/

Step 3: Update content

• meta.md: Version 2, date, "Added effect-ts error handling pattern"
• patterns.md: Add new section on Effect error handling
• tech-stack.md: Add effect-ts to approved libraries
• Leave other files unchanged

Step 4: Update symlink

rm docs/constitutions/current
ln -s v2 docs/constitutions/current

Step 5: Verify references (should all use current/)

Step 6: meta.md documents why (type-safe error handling, eliminate throw)

Testing This Skill

See test-scenarios.md for pressure scenarios and RED-GREEN-REFACTOR tests.