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name: syncing-claude-md description: This skill MUST be invoked when the user says "sync CLAUDE.md", "update agent instructions", "propagate constitution changes", "CLAUDE.md sync", or "constitution alignment". SHOULD also invoke when user mentions "agent instructions" updates.

Syncing CLAUDE.md

Overview

Ensure CLAUDE.md (the primary AI agent instruction file) remains synchronized with the constitution. CLAUDE.md serves a different audience (AI agents) than the constitution (human governance), so synchronization is selective—specific sections map with explicit sync rules.

When to Use

• Constitution has been amended (any version bump)
• New principle added to constitution
• Principle removed from constitution
• Quality gate thresholds changed
• Technology stack updated
• Governance rules modified
• User explicitly requests CLAUDE.md sync
• After running humaninloop:authoring-constitution or humaninloop:brownfield-constitution

When NOT to Use

• Constitution does not exist yet: Create constitution first with humaninloop:authoring-constitution
• CLAUDE.md is intentionally project-specific: Some projects customize CLAUDE.md beyond constitution scope
• No mapped sections changed: If amendment only touches rationale or non-mapped sections, sync may not be needed
• Draft constitution not yet ratified: Wait until constitution is approved before syncing

Common Mistakes

Mistake	Problem	Fix
Full duplication	CLAUDE.md becomes constitution copy, loses agent-focused format	Use selective sync per mapping table
Stale sync	CLAUDE.md lags behind constitution, agents use outdated rules	Sync on every constitution version bump
Missing version	No version tracking makes drift undetectable	Always include version footer in CLAUDE.md
Partial sync	Some sections synced, others forgotten	Use validation checklist before completing
Summary drift	Summarization loses enforcement keywords and thresholds	Preserve MUST/SHOULD/MAY and numeric thresholds

Why CLAUDE.md Sync Matters

┌─────────────────────────────────────────────────────────────────┐
│                    TWO AUDIENCES                                 │
├────────────────────────────┬────────────────────────────────────┤
│       CONSTITUTION         │           CLAUDE.MD                │
├────────────────────────────┼────────────────────────────────────┤
│ Audience: Humans           │ Audience: AI Agents                │
│ Purpose: Governance        │ Purpose: Runtime Instructions      │
│ Format: Detailed           │ Format: Actionable                 │
│ Contains: Rationale        │ Contains: Rules + Commands         │
│ Updated: Deliberately      │ Updated: Must track constitution   │
└────────────────────────────┴────────────────────────────────────┘

If CLAUDE.md diverges from the constitution, AI agents operate with outdated or incorrect guidance, undermining governance.

Consequences of Drift:

• Agents may use deprecated technology choices
• Quality gates may be bypassed due to outdated thresholds
• Principles may be violated because agents are unaware of new rules
• Commit conventions may be inconsistent
• Code review may miss violations that the constitution now prohibits

Benefits of Synchronization:

• Agents always operate with current governance rules
• Quality gates are consistently enforced
• New principles are immediately actionable
• Version tracking provides audit trail
• Human and AI guidance remain aligned

Mandatory Sync Mapping

The following sections MUST be synchronized:

Constitution Section	CLAUDE.md Section	Sync Rule
Core Principles	Principles Summary	MUST list all principles with enforcement keywords
Technology Stack	Technical Stack	MUST match exactly (table format)
Quality Gates	Quality Gates	MUST match exactly (table format)
Governance	Development Workflow	MUST include versioning rules and commit conventions
Project Structure	Project Structure	MUST match if present in constitution
Layer Import Rules	Architecture	MUST replicate dependency rules

Sync Rules

Two primary sync rules govern how content transfers:

Rule 1: MUST List All With Enforcement

Principles are summarized but preserve enforcement keywords, metrics, and thresholds. Rationale is omitted because CLAUDE.md focuses on actionable rules, not justification.

What to preserve:

• RFC 2119 keywords (MUST, SHOULD, MAY, MUST NOT, SHOULD NOT)
• Numeric thresholds (coverage ≥80%, complexity ≤10)
• Enforcement mechanisms (CI blocks, code review required)
• Quality gate commands (pytest --cov-fail-under=80)

What to omit:

• Rationale sections (why the rule exists)
• Historical context
• Detailed examples (unless critical for understanding)

Rule 2: MUST Match Exactly

Tables are copied directly with no summarization. This applies to:

• Technology Stack tables
• Quality Gates tables
• Layer Import Rules
• Project Structure (if present)

Why exact match: These sections contain precise configuration that agents must follow exactly. Summarization risks losing critical details like specific tool versions or threshold values.

See references/SECTION-TEMPLATES.md for detailed templates and examples for each sync rule.

Synchronization Process

The sync process follows six steps:

Step 1: Read Both Files

Load the constitution and CLAUDE.md. Verify both files exist and are readable. If CLAUDE.md does not exist, create it from the section templates.

Step 2: Extract Mapped Sections

For each row in the Mandatory Sync Mapping table, locate the corresponding sections in both files. Note any missing sections.

Step 3: Identify Gaps

Create a gap report documenting drift between files:

## Sync Gap Report

**Constitution Version**: 2.1.0
**CLAUDE.md Version**: 2.0.0

### Gaps Found

| Section | Constitution | CLAUDE.md | Gap Type |
|---------|--------------|-----------|----------|
| Quality Gates | coverage ≥80% | coverage ≥70% | Value mismatch |
| Principles | 7 principles | 6 principles | Missing content |
| Version | 2.1.0 | 2.0.0 | Version drift |

### Recommended Actions
1. Update CLAUDE.md Quality Gates: 70% → 80%
2. Add Principle VII to Principles Summary
3. Update version footer to 2.1.0

Step 4: Generate Updates

Prepare specific changes needed. For each gap, draft the exact text change required. Preview changes before applying.

Step 5: Apply Updates

Update CLAUDE.md with synchronized content. Apply changes section by section, preserving any CLAUDE.md-specific content not in the mapping.

Step 6: Validate Alignment

Run the Quick Validation checklist. All items must pass before considering sync complete.

See references/SYNC-PATTERNS.md for detailed process steps, validation checklists, and conflict resolution.

CLAUDE.md Structure

CLAUDE.md includes these sections for proper sync:

Required Sections

Section	Source	Sync Rule	Notes
Project Overview	Manual	N/A	Brief description of project purpose
Principles	Constitution Core Principles	List with enforcement	Omit rationale, keep keywords
Technical Stack	Constitution Technology Stack	Exact match	Copy table directly
Quality Gates	Constitution Quality Gates	Exact match	Copy table directly
Development Workflow	Constitution Governance	List with enforcement	Include commit conventions
Version Footer	Constitution version	Exact match	Format: `Version X.Y.Z

Optional Sections

These sections may exist in CLAUDE.md but are not synchronized from the constitution:

• Project Structure: Include if constitution defines directory structure
• Architecture: Include if constitution defines layer rules or import restrictions
• IDE Setup: Project-specific, not from constitution
• Local Development: Project-specific, not from constitution
• Troubleshooting: Project-specific, not from constitution

Optional sections are preserved during sync—they are not deleted or modified.

See references/SECTION-TEMPLATES.md for the complete structure template.

Sync Triggers

CLAUDE.md synchronization MUST occur when:

1. Constitution amended: Any version bump requires sync check
2. New principle added: MUST appear in Principles Summary
3. Principle removed: MUST be removed from Principles Summary
4. Quality gate changed: MUST update Quality Gates table
5. Tech stack changed: MUST update Technical Stack table
6. Governance changed: MUST update Development Workflow

Conflict Resolution

When CLAUDE.md contains content that conflicts with the constitution:

Scenario 1: CLAUDE.md Has Extra Content

CLAUDE.md may contain project-specific sections not in the constitution (e.g., IDE setup, local development tips). These sections are allowed and should be preserved during sync.

Action: Keep extra sections. Only update mapped sections.

Scenario 2: CLAUDE.md Has Different Values

A mapped section in CLAUDE.md contains different values than the constitution (e.g., different coverage threshold).

Action: Constitution is authoritative. Overwrite CLAUDE.md with constitution values.

Scenario 3: Constitution Section Missing

A mapped section exists in CLAUDE.md but not in the constitution.

Action: Flag for review. Either add section to constitution or remove from CLAUDE.md.

Scenario 4: Version Mismatch

CLAUDE.md version does not match constitution version.

Action: Always align versions. CLAUDE.md version MUST match constitution version after sync. If constitution is v2.1.0, CLAUDE.md footer must show v2.1.0.

Quick Validation

Before completing synchronization, verify:

• All Core Principles listed with enforcement keywords preserved
• Technology Stack table matches exactly (no omissions)
• Quality Gates table matches exactly (thresholds identical)
• Version numbers match (constitution = CLAUDE.md)
• No contradictions between files
• Extra CLAUDE.md sections preserved (not deleted)

See references/SYNC-PATTERNS.md for the complete validation checklist.

Commit Convention

When syncing, use this commit format:

docs: sync CLAUDE.md with constitution vX.Y.Z

- Updated Principles Summary (added Principle VII)
- Updated Quality Gates (coverage 70% -> 80%)
- Version aligned to X.Y.Z

Referenced Files

This skill includes detailed reference documentation:

File	Purpose	When to Use
references/SECTION-TEMPLATES.md	Templates for each CLAUDE.md section	When creating or restructuring CLAUDE.md
references/SYNC-PATTERNS.md	Detailed sync patterns, validation checklists, edge cases	When resolving complex sync scenarios

Related Skills

• For constitution authoring: OPTIONAL: Use humaninloop:authoring-constitution before syncing (greenfield)
• For brownfield projects: OPTIONAL: Use humaninloop:brownfield-constitution before syncing
• For validation: OPTIONAL: Use humaninloop:validation-constitution to verify constitution quality