💎 Shard: Refactoring Large File...

Split monolithic files into focused, maintainable modules.

Activation

When this skill activates, output:

💎 Shard: Refactoring large file...

Then execute the protocol below.

Context Guard

Context	Status
User says "shard", "split file", or "refactor"	ACTIVE: full protocol
Editing a file over 1000 lines	ACTIVE: suggest refactor
User says "refactor" for logic changes (not splitting)	DORMANT: not a shard task
Discussing code organization concepts	DORMANT: do not activate
File is under 500 lines	DORMANT: not worth splitting

Protocol

1. Identify the target file and count lines:

   wc -l <file>
   

2. Analyze structure:

   • List all exports (functions, components, types, constants)
   • Identify logical groupings
   • Map internal dependencies (what calls what)

3. Propose the split: present to user BEFORE executing:

   • Target: 100-300 lines per new file
   • Group related functionality
   • Keep types near consumers
   • Shared utilities in separate file

4. Execute the refactor:

   • Create new files with proper names
   • Move code to appropriate files
   • Add import/export statements
   • Create index.ts barrel if needed for backwards compatibility
   • Update all imports throughout the project

5. Verify build:

   npm run build 2>&1 | tail -20
   

6. Present result: new file structure with line counts

Inputs

• File path to refactor
• Optional: preferred split strategy or target file count

Outputs

• Multiple smaller files replacing the original
• Updated imports throughout project
• Build verification

Example Usage

User: "shard infrastructure/page.tsx: it's 1100 lines"

💎 Shard: Refactoring large file...

infrastructure/page.tsx (1,110 lines) → 6 files:
  page.tsx         (~120 lines), Main page, tab switcher
  RailwayTab.tsx   (~200 lines), Railway monitoring
  HetznerTab.tsx   (~180 lines), Hetzner monitoring
  HeadroomTab.tsx  (~250 lines), Headroom + setup guide
  types.ts         (~80 lines),   Shared interfaces
  constants.ts     (~60 lines):   Status configs

Build check: ✓ passed

Level History

• Lv.1: Base: File analysis and splitting with import updates. (Origin: MemStack v1.0, Feb 2026)
• Lv.2: Enhanced: Added YAML frontmatter, context guard, propose-before-execute, activation message. (Origin: MemStack v2.0 MemoryCore merge, Feb 2026)