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skills/code-transfer/SKILL.md

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+---
+name: code-transfer
+description: Transfer code between files with line-based precision. Use when users request copying code from one location to another, moving functions or classes between files, extracting code blocks, or inserting code at specific line numbers.
+---
+
+# Code Transfer
+
+Transfer code between files with precise line-based control. **Dual-mode operation**: native tools (1-10 files) or execution mode (10+ files, 90% token savings).
+
+## Operation Modes
+
+### Basic Mode (Default)
+Use Read, Edit, Bash scripts for 1-10 file operations. Works immediately, no setup required.
+
+### Execution Mode (10+ files)
+```python
+from api.filesystem import batch_copy
+from api.code_analysis import find_functions
+
+functions = find_functions('app.py', pattern='handle_.*')
+operations = [{
+    'source_file': 'app.py',
+    'start_line': f['start_line'],
+    'end_line': f['end_line'],
+    'target_file': 'handlers.py',
+    'target_line': -1
+} for f in functions]
+batch_copy(operations)
+```
+
+## When to Use
+
+- "copy this code to [file]"
+- "move [function/class] to [file]"
+- "extract this to a new file"
+- "insert at line [number]"
+- "reorganize into separate files"
+
+## Core Operations
+
+### 1. Extract Source Code
+```
+Read(file_path="src/auth.py")                              # Full file
+Read(file_path="src/auth.py", offset=10, limit=20)         # Line range
+Grep(pattern="def authenticate", -n=true, -A=10)           # Find function
+```
+
+### 2. Insert at Specific Line
+Use `line_insert.py` script for line-based insertion:
+
+```bash
+python3 skills/code-transfer/scripts/line_insert.py <file> <line_number> <code> [--backup]
+```
+
+**Examples:**
+```bash
+# Insert function at line 50
+python3 skills/code-transfer/scripts/line_insert.py src/utils.py 50 "def helper():\n    pass"
+
+# Insert with backup
+python3 skills/code-transfer/scripts/line_insert.py src/utils.py 50 "code" --backup
+
+# Insert at beginning
+python3 skills/code-transfer/scripts/line_insert.py src/new.py 1 "import os"
+```
+
+**When to use:**
+- User specifies exact line number
+- Inserting into new/empty files
+- Inserting at beginning/end without context
+
+### 3. Insert Relative to Content
+Use **Edit** when insertion point is relative to existing code:
+
+```
+Edit(
+  file_path="src/utils.py",
+  old_string="def existing():\n    pass",
+  new_string="def existing():\n    pass\n\ndef new():\n    return True"
+)
+```
+
+## Workflow Examples
+
+### Copy Function Between Files
+1. Find: `Grep(pattern="def validate_user", -n=true, -A=20)`
+2. Extract: `Read(file_path="auth.py", offset=45, limit=15)`
+3. Check target: `Read(file_path="validators.py")`
+4. Insert: Use `line_insert.py` or Edit based on context
+
+### Extract Class to New File
+1. Locate: `Grep(pattern="class DatabaseConnection", -n=true, -A=50)`
+2. Extract: `Read(file_path="original.py", offset=100, limit=50)`
+3. Create: `Write(file_path="database.py", content="<extracted>")`
+4. Update imports: `Edit` in original file
+5. Remove old class: `Edit` with replacement
+
+### Insert at Specific Line
+1. Validate: `Read(file_path="main.py", offset=20, limit=10)`
+2. Insert: `python3 skills/code-transfer/scripts/line_insert.py main.py 25 "logger.info('...')" --backup`
+3. Verify: `Read(file_path="main.py", offset=23, limit=5)`
+
+### Reorganize Into Modules
+1. Analyze: `Read(file_path="utils.py")`
+2. Identify groups: `Grep(pattern="^def |^class ", -n=true)`
+3. Extract each category: `Write` new files
+4. Update original: Re-export or redirect
+
+## Best Practices
+
+**Planning:**
+- Understand dependencies (imports, references)
+- Identify exact start/end of code block
+- Check target file structure
+- Ensure necessary imports included
+
+**Preservation:**
+- Include docstrings and comments
+- Transfer related functions together
+- Update imports in both files
+- Maintain formatting/indentation
+
+**Validation:**
+- Verify insertion placement
+- Check syntax
+- Test imports
+- Suggest running tests
+
+**Backups:**
+- Use `--backup` for significant changes
+- Critical file operations
+- Large deletions
+
+## Integration
+
+- **code-refactor**: Refactor after transferring
+- **test-fixing**: Run tests after reorganizing
+- **feature-planning**: Plan large reorganizations