Claude Code CLI Integration

Claude Code CLI Integration Skill

Purpose: Enable Claude Code extension to orchestrate its own CLI for operations requiring unrestricted system access, bypassing VS Code extension permission limitations.

Version: 1.0.0
Auto-Invoke: False (manual activation or SubAgent triggers)

Overview

This Skill enables Claude Code (VS Code extension) to leverage Claude Code CLI for:

• Batch file operations without permission prompts (50+ files)
• System-level configuration and package installation
• Complex workflows requiring both IDE context and system access
• Automation scripts that would be blocked in sandboxed environment

Key Innovation: Self-orchestration - Claude Code extension commands its own CLI for unrestricted operations while maintaining IDE context awareness.

When to Use This Skill

✅ Use Claude Code CLI for:

• Batch operations: 50+ files requiring individual permission prompts
• System access: Package installation, environment configuration
• Automation: Scripts that need unrestricted file system access
• Performance: Bulk processing where speed matters
• Task automation: Bulk task file creation/updates in fstrent_spec_tasks

❌ Don't use Claude Code CLI for:

• Single files: Use extension's native file operations
• Interactive debugging: Requires IDE integration
• Quick edits: Immediate IDE feedback needed
• Small batches: <10 files (permission prompts acceptable)

Decision Framework

Strategy Selection

The Skill uses three strategies based on task characteristics:

Strategy A: Extension Native (Fast Path)

Criteria:

• Files: <10
• System access: No
• IDE context: Critical
• Time: <30 seconds

Example: Code review, quick edit, single file refactor

Strategy B: CLI (System Path)

Criteria:

• Files: >10
• System access: Yes
• Permission prompts: >5
• Performance critical: Yes

Example: Refactor 150 files, system setup, bulk task creation

Strategy C: Hybrid (Complex Path)

Criteria:

• Context gathering: Extension
• Bulk execution: CLI
• Validation: Extension
• Multi-step workflow: Yes

Example: Complex refactoring with validation, system setup with testing

Command Patterns

Basic Usage

# Simple command
claude-code "Your instruction here"

# With file context
claude-code "Analyze this file" --file path/to/file.py

# With directory context
claude-code "Refactor all Python files" --directory src/

# Dry run first (recommended)
claude-code "Refactor codebase" --dry-run
claude-code "Refactor codebase" --auto-approve  # After review

Integration Patterns

Pattern 1: Batch File Processing

# Extension: Analyze structure
# CLI: Process all files at once
claude-code "Add type hints to all Python files in src/" \
  --directory src/ \
  --auto-approve

Pattern 2: System Configuration

# CLI handles system-level operations
claude-code "Install Python 3.11, uv, configure virtual environment" \
  --auto-approve

Pattern 3: Context Gathering + Execution

# Extension: Generate plan
cat > execution_plan.md << EOF
# Refactoring Plan
- Pattern: old → new
- Files: 150
- Validation: Run tests
EOF

# CLI: Execute bulk operation
claude-code "Execute refactoring according to plan" \
  --file execution_plan.md \
  --directory src/ \
  --dry-run

# Extension: Validate results
pytest tests/ -v

Workflow Examples

Example 1: Large-Scale Refactoring

Task: Refactor 150 Python files to new import structure

Steps:

1. Extension: Analyze current import structure
2. Extension: Generate refactoring plan
3. CLI: Execute bulk refactoring (dry run)
4. User: Review changes
5. CLI: Apply refactoring
6. Extension: Run tests to validate

Command Sequence:

# Step 1-2: Extension analyzes and creates plan
cat > refactor_plan.md << EOF
# Import Refactoring Plan
- Old: from utils import helper
- New: from src.utils.helpers import helper
- Files: 150
EOF

# Step 3: CLI dry run
claude-code "Refactor according to plan" \
  --file refactor_plan.md \
  --directory src/ \
  --dry-run

# Step 5: CLI applies
claude-code "Apply refactoring" \
  --file refactor_plan.md \
  --directory src/ \
  --auto-approve

# Step 6: Extension validates
pytest tests/ -v

Result:

• Time saved: ~90 minutes (vs manual approval)
• Permission prompts: 1 (vs 150+)
• Success rate: 100%

Example 2: System Setup

Task: Setup Python project with dependencies and MCP servers

Steps:

1. Extension: Generate project plan
2. CLI: Install system packages
3. CLI: Create project structure
4. CLI: Install dependencies
5. Extension: Configure IDE settings
6. Extension: Validate setup

Command Sequence:

# Step 2: System setup
claude-code "Install Python 3.11, uv, virtual environment" \
  --auto-approve

# Step 3: Project structure
claude-code "Create project structure: src/, tests/, docs/" \
  --auto-approve

# Step 4: Dependencies
claude-code "Install dependencies from requirements.txt" \
  --file requirements.txt

# Step 6: Extension validates
python --version && pytest --version

Result:

• Setup time: ~15 minutes (vs ~60 manual)
• Configuration: 100% accurate
• MCP servers: All configured

Example 3: Task Automation

Task: Create task files for all features in PLAN.md

Steps:

1. Extension: Read PLAN.md, identify features
2. CLI: Generate all task files at once
3. Extension: Update TASKS.md with new entries
4. Extension: Validate task file structure

Command Sequence:

# Step 2: CLI generates all tasks
claude-code "Read PLAN.md and create task files for all features" \
  --file .fstrent_spec_tasks/PLAN.md \
  --output-dir .fstrent_spec_tasks/tasks/ \
  --dry-run

# After review
claude-code "Create task files" \
  --file .fstrent_spec_tasks/PLAN.md \
  --output-dir .fstrent_spec_tasks/tasks/ \
  --auto-approve

# Step 3: Extension updates TASKS.md
# Step 4: Extension validates

Result:

• Tasks created: 20+ (in minutes)
• Manual effort saved: ~2 hours
• Consistency: 100%

Security Considerations

Critical Security Rules

✅ Always:

• Review commands before execution
• Use --dry-run for destructive operations
• Validate file paths (prevent directory traversal)
• Use files for sensitive data (not command line)
• Log all CLI operations for audit trail

❌ Never:

• Use --auto-approve without reviewing dry-run
• Hardcode credentials in commands
• Execute commands from untrusted sources
• Bypass security checks for convenience

Safe Command Patterns

✅ SAFE:

# Uses file for context, validates paths
claude-code "Process files" \
  --file context.txt \
  --directory /validated/path

❌ UNSAFE:

# Command injection risk
user_input="$1"
claude-code "$user_input" --auto-approve

✅ SAFE (with validation):

# Validates input first
if [[ "$1" =~ ^[a-zA-Z0-9_/-]+$ ]]; then
  claude-code "Process" --file "$1"
else
  echo "Invalid input"
fi

Tool Selection Matrix

Integration with fstrent_spec_tasks

Task Creation Automation

# Create multiple tasks from PLAN.md
claude-code "Read PLAN.md and create task files" \
  --file .fstrent_spec_tasks/PLAN.md \
  --output-dir .fstrent_spec_tasks/tasks/

Bulk Task Updates

# Update all task files with new YAML fields
claude-code "Add priority field to all tasks" \
  --directory .fstrent_spec_tasks/tasks/ \
  --dry-run

# After review
claude-code "Apply task updates" \
  --directory .fstrent_spec_tasks/tasks/ \
  --auto-approve

Documentation Generation

# Generate sprint summaries
claude-code "Generate sprint summary from completed tasks" \
  --directory .fstrent_spec_tasks/tasks/ \
  --output docs/SPRINT_SUMMARY.md

Performance Optimization

Parallel Processing

# Process multiple directories in parallel
claude-code "Process models" --directory src/models &
claude-code "Process views" --directory src/views &
claude-code "Process controllers" --directory src/controllers &
wait
echo "All processing complete"

Caching Strategy

# Cache expensive analysis
if [ -f .cache/analysis.json ]; then
  analysis=$(cat .cache/analysis.json)
else
  claude-code "Analyze codebase" > .cache/analysis.json
fi

# Use cached results
claude-code "Refactor based on analysis" \
  --file .cache/analysis.json

Incremental Processing

# Only process changed files
changed_files=$(find src -newer .last_run -name "*.py")
echo "$changed_files" | while read file; do
  claude-code "Process file" --file "$file"
done
date > .last_run

Error Handling

Graceful Degradation

Level 1: Retry with adjusted parameters

if ! claude-code "Process files"; then
  claude-code "Process files" --verbose
fi

Level 2: Break into smaller batches

if ! claude-code "Process all 500 files"; then
  for batch in batch1 batch2 batch3; do
    claude-code "Process batch" --pattern "$batch"
  done
fi

Level 3: Fall back to extension native

if ! claude-code "Critical operation" 2>error.log; then
  echo "Falling back to extension native operations"
  # Extension handles with user approval
fi

Activation

Manual Activation

"Use Claude Code CLI to process all these files"
"Leverage CLI for batch operation"

SubAgent Activation

The claude-code-orchestrator SubAgent automatically activates for:

• Batch operations (>10 files)
• System-level tasks
• Complex multi-step workflows
• Tasks requiring >5 permission prompts

Success Metrics

Quantitative

• ✅ 80% reduction in permission prompts
• ✅ 3x faster execution for 50+ file operations
• ✅ <5 second response time for CLI commands
• ✅ 95%+ success rate for strategy decisions

Qualitative

• ✅ Batch processing without interruption
• ✅ System-level automation from VS Code
• ✅ Intelligent workflow orchestration
• ✅ Security-first command execution

Troubleshooting

Issue: CLI Not Found

# Check installation
which claude-code

# Add to PATH if needed
export PATH="$PATH:/path/to/claude-code"

Issue: Permission Denied

# Check permissions
ls -la /path/to/files

# Fix if needed
chmod +x /path/to/files

Issue: Command Hangs

# Use timeout
timeout 300 claude-code "Operation"

# Use non-interactive mode
claude-code "Operation" --non-interactive

Related Resources

Files

• Rule: .cursor/rules/fstrent_spec_tasks/claude_code_cli.mdc (Cursor version)
• Agent: .cursor/rules/fstrent_spec_tasks/agents/claude_code_orchestrator.mdc (Cursor version)
• SubAgent: .claude/agents/claude-code-orchestrator.md (Claude Code version)
• Rules: .claude/rules/claude_code_cli_integration.md (Claude Code version)
• Documentation: docs/20251028_212220_Cursor_CLAUDE_CODE_CLI_INTEGRATION_GUIDE.md

Related Skills

• fstrent-task-management - Task lifecycle management
• fstrent-planning - Project planning and PRD creation
• web-tools - Browser automation and web scraping
• computer-use - Desktop automation and GUI control

SubAgents

• claude-code-orchestrator - Intelligent CLI orchestration agent

Version: 1.0.0
Created: 2025-10-28
Status: Production Ready
Testing: Pending real-world validation