bacchus-labs/wrangler:startup-checklist

Startup Checklist Skill

Skill Usage Announcement

MANDATORY: When using this skill, announce it at the start with:

🔧 Using Skill: wrangler:startup-checklist | [brief purpose based on context]

Example:

🔧 Using Skill: wrangler:startup-checklist | [Provide context-specific example of what you're doing]

This creates an audit trail showing which skills were applied during the session.

Purpose

Run automatically on session start to ensure project is using current wrangler version. Detects breaking changes and provides clear upgrade path.

When to Use

This skill runs automatically via session hooks. DO NOT manually invoke unless debugging version detection.

Auto-execution: Triggered by hooks/session-start.sh after workspace initialization.

Workflow

Phase 1: Read Project Version

Goal: Determine which version of wrangler the project is currently using.

1. Locate Constitution File

   Check locations in priority order:

   # Priority 1: New location (v1.1.0+)
   if [ -f ".wrangler/governance/CONSTITUTION.md" ]; then
     PROJECT_CONSTITUTION=".wrangler/governance/CONSTITUTION.md"
   
   # Priority 2: Legacy location (v1.0.0)
   elif [ -f "specifications/_CONSTITUTION.md" ]; then
     PROJECT_CONSTITUTION="specifications/_CONSTITUTION.md"
   
   # No constitution found
   else
     echo "⚠️ No constitution found. Initialize governance first."
     echo "   Run: /wrangler:initialize-governance"
     exit with WARN status
   fi
   

2. Extract Version from Frontmatter

   Read YAML frontmatter and extract wranglerVersion field:

   ---
   wranglerVersion: "1.1.0"
   lastUpdated: "2025-11-18"
   ---
   

   Fallback behavior:

   • If wranglerVersion field missing → Assume v1.0.0 (pre-versioning era)
   • If frontmatter entirely missing → Assume v1.0.0
   • If file exists but is empty → WARN and exit

3. Validate Version Format

   Ensure version follows semantic versioning (e.g., "1.1.0", "2.0.0"):

   • Pattern: MAJOR.MINOR.PATCH
   • Valid: "1.0.0", "1.1.0", "2.0.0"
   • Invalid: "1", "1.1", "v1.0.0", "latest"

   If invalid:

   ⚠️ Invalid version format in constitution: {version}
      Expected: X.Y.Z (e.g., 1.1.0)
      Fix constitution frontmatter and restart session
   

Phase 2: Read Current Wrangler Version

Goal: Determine latest available wrangler version.

1. Locate Plugin Directory

   Find wrangler plugin installation:

   • Read .claude-plugin/plugin.json to get plugin path
   • Navigate to plugin root directory
   • Locate skills/.wrangler-releases/CURRENT_VERSION

2. Read CURRENT_VERSION File

   # Expected location (relative to plugin root)
   CURRENT_VERSION_FILE="skills/.wrangler-releases/CURRENT_VERSION"
   
   if [ ! -f "$CURRENT_VERSION_FILE" ]; then
     echo "⚠️ Cannot detect wrangler version. Plugin may be corrupted."
     echo "   Expected: $CURRENT_VERSION_FILE"
     echo "   Action: Reinstall wrangler plugin"
     exit with WARN status
   fi
   
   CURRENT_VERSION=$(cat "$CURRENT_VERSION_FILE" | tr -d '[:space:]')
   

3. Validate Current Version

   Same validation as project version (semantic versioning check).

Phase 3: Compare Versions

Goal: Determine if project is up to date, behind, or ahead.

compare_versions() {
  local project_ver="$1"
  local current_ver="$2"

  # Parse versions (split on '.')
  IFS='.' read -r -a project <<< "$project_ver"
  IFS='.' read -r -a current <<< "$current_ver"

  # Compare major version
  if [ "${project[0]}" -lt "${current[0]}" ]; then
    return 1  # project < current
  elif [ "${project[0]}" -gt "${current[0]}" ]; then
    return 2  # project > current
  fi

  # Compare minor version
  if [ "${project[1]}" -lt "${current[1]}" ]; then
    return 1  # project < current
  elif [ "${project[1]}" -gt "${current[1]}" ]; then
    return 2  # project > current
  fi

  # Compare patch version
  if [ "${project[2]}" -lt "${current[2]}" ]; then
    return 1  # project < current
  elif [ "${project[2]}" -gt "${current[2]}" ]; then
    return 2  # project > current
  fi

  return 0  # project == current
}

compare_versions "$PROJECT_VERSION" "$CURRENT_VERSION"
result=$?

case $result in
  0)
    # Versions match - SUCCESS
    → Skip to Phase 5 (report SUCCESS)
    ;;
  1)
    # Project behind current - check breaking changes
    → Continue to Phase 4
    ;;
  2)
    # Project ahead of current - unusual case
    → Skip to Phase 5 (report WARN - unusual state)
    ;;
esac

Phase 4: Check for Breaking Changes

Goal: Determine if version gap includes breaking changes requiring migration.

1. List Version Gap

   Generate list of all versions between project and current:

   # Example: If project=1.0.0, current=1.3.0
   # Gap versions: [1.1.0, 1.2.0, 1.3.0]
   
   get_version_gap() {
     local start="$1"
     local end="$2"
   
     # Parse versions
     IFS='.' read -r -a start_parts <<< "$start"
     IFS='.' read -r -a end_parts <<< "$end"
   
     # Simple approach: List all release notes between versions
     # (Assumes sequential versioning - minor version increments)
   
     versions=()
   
     # For each potential version, check if release note exists
     for minor in $(seq $((start_parts[1] + 1)) ${end_parts[1]}); do
       candidate="${start_parts[0]}.${minor}.0"
       if [ -f "skills/.wrangler-releases/${candidate}.md" ]; then
         versions+=("$candidate")
       fi
     done
   
     echo "${versions[@]}"
   }
   
   GAP_VERSIONS=$(get_version_gap "$PROJECT_VERSION" "$CURRENT_VERSION")
   

2. Parse Release Notes

   For each version in gap, read frontmatter and check breakingChanges field:

   check_breaking_changes() {
     local versions=("$@")
     local breaking_versions=()
   
     for version in "${versions[@]}"; do
       release_note="skills/.wrangler-releases/${version}.md"
   
       if [ ! -f "$release_note" ]; then
         echo "⚠️ Missing release note: $release_note"
         continue
       fi
   
       # Extract frontmatter 'breakingChanges' field
       breaking=$(grep "^breakingChanges:" "$release_note" | awk '{print $2}')
   
       if [ "$breaking" = "true" ]; then
         breaking_versions+=("$version")
       fi
     done
   
     echo "${breaking_versions[@]}"
   }
   
   BREAKING_VERSIONS=$(check_breaking_changes $GAP_VERSIONS)
   

3. Categorize Status

   if [ -z "$BREAKING_VERSIONS" ]; then
     # No breaking changes - optional updates
     STATUS="WARN"
     MESSAGE="Non-breaking updates available"
   else
     # Breaking changes exist - migration required
     STATUS="OUTDATED"
     MESSAGE="Breaking changes detected - migration required"
   fi
   

Phase 5: Report Status

Goal: Provide clear, actionable output to user.

SUCCESS Output

✅ Wrangler version up to date (v1.1.0)
   All systems ready.

When: Project version == Current version

Exit code: 0

---

WARN Output (Non-Breaking Updates)

⚠️ New wrangler version available
   Project: v1.1.0
   Latest:  v1.2.0
   Releases behind: 1

   Updates include:
   - New skills: [list from release notes]
   - Enhancements: [summary from release notes]

   No breaking changes detected.
   Update is optional but recommended.

   To update: Run /update-yourself

When: Project version < Current version AND no breaking changes in gap

Exit code: 0

Details to include:

• Specific versions being compared
• Number of releases behind
• High-level summary of new features (from release notes)
• Clear call to action

---

OUTDATED Output (Breaking Changes)

❌ Wrangler version outdated - breaking changes detected
   Project: v1.0.0
   Latest:  v1.1.0
   Releases behind: 1

   Breaking changes in:
   - v1.1.0: Directory structure refactored to .wrangler/

   MIGRATION REQUIRED

   Summary of breaking changes:
   • All governance files moved from root to .wrangler/
   • Constitution now requires wranglerVersion frontmatter
   • MCP server paths updated

   To migrate: Run /update-yourself
   To skip version check: Set WRANGLER_SKIP_VERSION_CHECK=true

   WARNING: Skipping migration may cause governance features to fail.

When: Project version < Current version AND breaking changes exist in gap

Exit code: 0 (still allow session to start)

Details to include:

• Specific versions being compared
• Number of releases behind
• List of versions with breaking changes
• High-level summary of WHAT broke (from release notes)
• Clear migration path
• Escape hatch (skip flag) for emergencies

---

WARN Output (Project Ahead of Plugin)

⚠️ Unusual version state detected
   Project: v2.0.0
   Plugin:  v1.1.0

   Your project reports a newer wrangler version than the plugin.

   Possible causes:
   - Plugin needs updating (check for new plugin version)
   - Constitution frontmatter manually edited incorrectly
   - Project uses unreleased wrangler features

   Recommended actions:
   1. Check if wrangler plugin has updates available
   2. Verify constitution frontmatter is correct
   3. Report issue if problem persists

When: Project version > Current version

Exit code: 0

---

ERROR Output (Constitution Missing)

⚠️ No constitution found. Initialize governance first.

   Expected locations:
   - .wrangler/governance/CONSTITUTION.md (v1.1.0+)
   - specifications/_CONSTITUTION.md (v1.0.0)

   To initialize: Run /wrangler:initialize-governance

   Skipping version check until governance initialized.

When: No constitution found in either location

Exit code: 0 (allow session to start)

---

ERROR Output (Plugin Corrupted)

⚠️ Cannot detect wrangler version. Plugin may be corrupted.
   Expected: skills/.wrangler-releases/CURRENT_VERSION
   Found: [none]

   Recommended actions:
   1. Reinstall wrangler plugin
   2. Check plugin installation directory
   3. Report issue if reinstall doesn't fix

   Skipping version check until plugin repaired.

When: CURRENT_VERSION file missing from plugin

Exit code: 0

Completion Signals

Return one of three statuses:

1. SUCCESS: Project fully upgraded, no action needed
2. WARN: Updates available OR unusual state, but not critical
3. OUTDATED: Breaking changes detected, migration strongly recommended

All statuses exit with code 0 to allow session to start normally.

Error Handling

Constitution Missing

Scenario: Neither .wrangler/governance/CONSTITUTION.md nor specifications/_CONSTITUTION.md exists

Output: ERROR message (see Phase 5)

Signal: WARN

Action: Recommend /wrangler:initialize-governance

Allow session: Yes (exit 0)

---

CURRENT_VERSION Missing

Scenario: Plugin installation missing skills/.wrangler-releases/CURRENT_VERSION

Output: ERROR message (see Phase 5)

Signal: WARN

Action: Recommend reinstalling plugin

Allow session: Yes (exit 0)

---

Invalid Version Format

Scenario: Constitution has wranglerVersion: "invalid" or wranglerVersion: "v1.0.0" (leading 'v')

Output:

⚠️ Invalid version format in constitution: {version}
   Expected: X.Y.Z (e.g., 1.1.0)
   Found: {actual_value}

   Fix constitution frontmatter:
   ---
   wranglerVersion: "1.1.0"  # Correct format
   ---

   Assuming v1.0.0 for now.

Signal: WARN

Fallback: Assume v1.0.0

Allow session: Yes (exit 0)

---

Missing Release Note

Scenario: Gap version (e.g., 1.2.0) detected but skills/.wrangler-releases/1.2.0.md missing

Output:

⚠️ Missing release note: skills/.wrangler-releases/1.2.0.md
   Version gap contains undocumented release

   Cannot determine if v1.2.0 has breaking changes.
   Assuming breaking changes exist for safety.

   Plugin may be corrupted. Consider reinstalling.

Signal: OUTDATED (assume breaking changes for safety)

Allow session: Yes (exit 0)

Environment Variables

WRANGLER_SKIP_VERSION_CHECK

Type: Boolean (true/false)

Purpose: Completely skip version detection

Usage:

export WRANGLER_SKIP_VERSION_CHECK=true

Effect:

• Startup skill exits immediately without any checks
• No output (silent skip)
• Useful for emergency situations or CI/CD

---

WRANGLER_DEBUG_VERSION

Type: Boolean (true/false)

Purpose: Enable verbose version detection output

Usage:

export WRANGLER_DEBUG_VERSION=true

Debug output includes:

• Constitution file location used
• Raw version strings extracted
• Version comparison results
• List of release notes checked
• Frontmatter parsing details

Example:

[DEBUG] Constitution found: .wrangler/governance/CONSTITUTION.md
[DEBUG] Extracted version: "1.1.0"
[DEBUG] Current version: "1.2.0"
[DEBUG] Comparison: 1.1.0 < 1.2.0
[DEBUG] Checking release note: skills/.wrangler-releases/1.2.0.md
[DEBUG] Breaking changes: false
[DEBUG] Status: WARN (non-breaking updates)

Integration with Session Start

This skill is invoked automatically in hooks/session-start.sh:

#!/bin/bash
# Session start hook for wrangler projects

# ... workspace initialization ...

# Run version check (unless skipped)
if [ "$WRANGLER_SKIP_VERSION_CHECK" != "true" ]; then
  # Invoke startup-checklist skill
  # (Implementation note: skills are invoked via Claude Code's Skill tool)
  # This would be done by Claude Code automatically based on skill metadata

  # For now, this is a placeholder showing the integration point
  echo "Running startup checklist..."
fi

Note: The actual invocation mechanism depends on how Claude Code plugins can trigger skills from bash hooks. This may require:

• A CLI command to invoke skills (e.g., wrangler-cli run-skill startup-checklist)
• Or Claude Code automatically running skills marked with autoRun: true metadata
• Or session hook outputting a marker that Claude Code picks up

Testing

Test Cases

1. Project at v1.1.0, current v1.1.0 → SUCCESS

Setup:

• Constitution: wranglerVersion: "1.1.0"
• CURRENT_VERSION: 1.1.0

Expected output:

✅ Wrangler version up to date (v1.1.0)
   All systems ready.

Status: SUCCESS

---

2. Project at v1.0.0, current v1.1.0 (breaking) → OUTDATED

Setup:

• Constitution: wranglerVersion: "1.0.0"
• CURRENT_VERSION: 1.1.0
• 1.1.0.md: breakingChanges: true

Expected output:

❌ Wrangler version outdated - breaking changes detected
   Project: v1.0.0
   Latest:  v1.1.0
   ...

Status: OUTDATED

---

3. Project at v1.1.0, current v1.2.0 (non-breaking) → WARN

Setup:

• Constitution: wranglerVersion: "1.1.0"
• CURRENT_VERSION: 1.2.0
• 1.2.0.md: breakingChanges: false

Expected output:

⚠️ New wrangler version available
   Project: v1.1.0
   Latest:  v1.2.0
   ...

Status: WARN

---

4. Project at v1.0.0, current v1.3.0 (multiple releases) → OUTDATED

Setup:

• Constitution: wranglerVersion: "1.0.0"
• CURRENT_VERSION: 1.3.0
• 1.1.0.md: breakingChanges: true
• 1.2.0.md: breakingChanges: false
• 1.3.0.md: breakingChanges: true

Expected output:

❌ Wrangler version outdated - breaking changes detected
   Project: v1.0.0
   Latest:  v1.3.0
   Releases behind: 3

   Breaking changes in:
   - v1.1.0: [description]
   - v1.3.0: [description]
   ...

Status: OUTDATED

---

5. Constitution missing → WARN

Setup:

• No constitution at either location

Expected output:

⚠️ No constitution found. Initialize governance first.
   ...

Status: WARN

---

6. wranglerVersion field missing → Assume v1.0.0

Setup:

• Constitution exists but no frontmatter or missing wranglerVersion field
• CURRENT_VERSION: 1.1.0

Expected behavior:

• Assume project is v1.0.0
• Proceed with version comparison as if wranglerVersion: "1.0.0"

Status: OUTDATED (if breaking changes in 1.1.0)

---

7. CURRENT_VERSION file missing → WARN

Setup:

• Constitution exists
• skills/.wrangler-releases/CURRENT_VERSION missing

Expected output:

⚠️ Cannot detect wrangler version. Plugin may be corrupted.
   ...

Status: WARN

Example Execution Flow

Scenario: User starts Claude Code session with v1.0.0 project

1. User opens Claude Code in project directory
   ↓
2. Session hook runs (hooks/session-start.sh)
   ↓
3. Workspace initialization completes
   ↓
4. Startup skill invoked (automatically)
   ↓
5. Read project version:
   - Check .wrangler/governance/CONSTITUTION.md → Not found
   - Check specifications/_CONSTITUTION.md → Found
   - Extract frontmatter → No wranglerVersion field
   - Assume: v1.0.0
   ↓
6. Read current version:
   - Read skills/.wrangler-releases/CURRENT_VERSION
   - Parse: "1.1.0"
   ↓
7. Compare versions:
   - 1.0.0 < 1.1.0
   - Project is behind
   ↓
8. Check for breaking changes:
   - Gap versions: [1.1.0]
   - Read skills/.wrangler-releases/1.1.0.md
   - breakingChanges: true
   ↓
9. Report status:
   - Status: OUTDATED
   - Output: ❌ message with migration instructions
   ↓
10. User sees output and runs /update-yourself
    ↓
11. Migration instructions displayed

Implementation Notes

Version Comparison Algorithm

Use semantic versioning comparison:

• Compare major versions first
• If equal, compare minor versions
• If equal, compare patch versions

Edge cases:

• Leading zeros: "1.01.0" → Invalid, warn user
• Extra components: "1.1.0.beta" → Invalid, warn user
• Leading 'v': "v1.1.0" → Invalid, strip and warn user

Performance Considerations

Target: Complete version check in <1 second

Optimizations:

• Read only frontmatter (not entire release notes)
• Cache CURRENT_VERSION in session
• Skip gap analysis if versions match (early exit)
• Only parse release notes if project is behind

Security Considerations

Path Traversal: Ensure release note paths are sanitized

• Valid: skills/.wrangler-releases/1.1.0.md
• Invalid: skills/.wrangler-releases/../../etc/passwd

Validation: Check file paths before reading

Compatibility

Backwards Compatibility:

• v1.0.0 projects without frontmatter: Assume v1.0.0
• Legacy constitution location: Check specifications/_CONSTITUTION.md
• Missing version field: Graceful degradation

Forward Compatibility:

• Handle project versions newer than plugin
• Warn but don't block session start

Rollback

If startup skill causes issues:

1. Disable temporarily:

   export WRANGLER_SKIP_VERSION_CHECK=true
   

2. Report issue: Include debug output (WRANGLER_DEBUG_VERSION=true)

3. Workaround: Manually update constitution frontmatter to match CURRENT_VERSION

Future Enhancements

Planned:

• [ ] Cache version check results for 24 hours
• [ ] Support for pre-release versions (1.1.0-beta.1)
• [ ] Automatic migration (not just instructions)
• [ ] Integration with plugin update mechanism
• [ ] Telemetry (track version distribution across projects)

Not Planned:

• Downgrade support (only upgrade paths)
• Automatic rollback (too risky)
• Network-based version checks (offline-first approach)