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.opencode/skills/repomix/SKILL.md

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+---
+name: ck:repomix
+description: Pack repositories into AI-friendly files with Repomix (XML, Markdown, plain text). Use for codebase snapshots, LLM context preparation, security audits, third-party library analysis.
+argument-hint: "[path] [--style xml|markdown|plain|json]"
+metadata:
+  author: claudekit
+  version: "1.0.0"
+---
+
+# Repomix Skill
+
+Repomix packs entire repositories into single, AI-friendly files. Perfect for feeding codebases to LLMs like Claude, ChatGPT, and Gemini.
+
+## When to Use
+
+Use when:
+- Packaging codebases for AI analysis
+- Creating repository snapshots for LLM context
+- Analyzing third-party libraries
+- Preparing for security audits
+- Generating documentation context
+- Investigating bugs across large codebases
+- Creating AI-friendly code representations
+
+## Quick Start
+
+### Check Installation
+```bash
+repomix --version
+```
+
+### Install
+```bash
+# npm
+npm install -g repomix
+
+# Homebrew (macOS/Linux)
+brew install repomix
+```
+
+### Basic Usage
+```bash
+# Package current directory (generates repomix-output.xml)
+repomix
+
+# Specify output format
+repomix --style markdown
+repomix --style json
+
+# Package remote repository
+npx repomix --remote owner/repo
+
+# Custom output with filters
+repomix --include "src/**/*.ts" --remove-comments -o output.md
+```
+
+## Core Capabilities
+
+### Repository Packaging
+- AI-optimized formatting with clear separators
+- Multiple output formats: XML, Markdown, JSON, Plain text
+- Git-aware processing (respects .gitignore)
+- Token counting for LLM context management
+- Security checks for sensitive information
+
+### Remote Repository Support
+Process remote repositories without cloning:
+```bash
+# Shorthand
+npx repomix --remote yamadashy/repomix
+
+# Full URL
+npx repomix --remote https://github.com/owner/repo
+
+# Specific commit
+npx repomix --remote https://github.com/owner/repo/commit/hash
+```
+
+### Comment Removal
+Strip comments from supported languages (HTML, CSS, JavaScript, TypeScript, Vue, Svelte, Python, PHP, Ruby, C, C#, Java, Go, Rust, Swift, Kotlin, Dart, Shell, YAML):
+```bash
+repomix --remove-comments
+```
+
+## Common Use Cases
+
+### Code Review Preparation
+```bash
+# Package feature branch for AI review
+repomix --include "src/**/*.ts" --remove-comments -o review.md --style markdown
+```
+
+### Security Audit
+```bash
+# Package third-party library
+npx repomix --remote vendor/library --style xml -o audit.xml
+```
+
+### Documentation Generation
+```bash
+# Package with docs and code
+repomix --include "src/**,docs/**,*.md" --style markdown -o context.md
+```
+
+### Bug Investigation
+```bash
+# Package specific modules
+repomix --include "src/auth/**,src/api/**" -o debug-context.xml
+```
+
+### Implementation Planning
+```bash
+# Full codebase context
+repomix --remove-comments --copy
+```
+
+## Command Line Reference
+
+### File Selection
+```bash
+# Include specific patterns
+repomix --include "src/**/*.ts,*.md"
+
+# Ignore additional patterns
+repomix -i "tests/**,*.test.js"
+
+# Disable .gitignore rules
+repomix --no-gitignore
+```
+
+### Output Options
+```bash
+# Output format
+repomix --style markdown  # or xml, json, plain
+
+# Output file path
+repomix -o output.md
+
+# Remove comments
+repomix --remove-comments
+
+# Copy to clipboard
+repomix --copy
+```
+
+### Configuration
+```bash
+# Use custom config file
+repomix -c custom-config.json
+
+# Initialize new config
+repomix --init  # creates repomix.config.json
+```
+
+## Token Management
+
+Repomix automatically counts tokens for individual files, total repository, and per-format output.
+
+Typical LLM context limits:
+- Claude Sonnet 4.5: ~200K tokens
+- GPT-4: ~128K tokens
+- GPT-3.5: ~16K tokens
+
+### Token Count Optimization
+Understanding your codebase's token distribution is crucial for optimizing AI interactions. Use the --token-count-tree option to visualize token usage across your project:
+
+```bash
+repomix --token-count-tree
+```
+This displays a hierarchical view of your codebase with token counts:
+
+```
+🔢 Token Count Tree:
+────────────────────
+└── src/ (70,925 tokens)
+    ├── cli/ (12,714 tokens)
+    │   ├── actions/ (7,546 tokens)
+    │   └── reporters/ (990 tokens)
+    └── core/ (41,600 tokens)
+        ├── file/ (10,098 tokens)
+        └── output/ (5,808 tokens)
+```
+You can also set a minimum token threshold to focus on larger files:
+
+```bash
+repomix --token-count-tree 1000  # Only show files/directories with 1000+ tokens
+```
+
+This helps you:
+
+- Identify token-heavy files that might exceed AI context limits
+- Optimize file selection using --include and --ignore patterns
+- Plan compression strategies by targeting the largest contributors
+- Balance content vs. context when preparing code for AI analysis
+
+## Security Considerations
+
+Repomix uses Secretlint to detect sensitive data (API keys, passwords, credentials, private keys, AWS secrets).
+
+Best practices:
+1. Always review output before sharing
+2. Use `.repomixignore` for sensitive files
+3. Enable security checks for unknown codebases
+4. Avoid packaging `.env` files
+5. Check for hardcoded credentials
+
+Disable security checks if needed:
+```bash
+repomix --no-security-check
+```
+
+## Implementation Workflow
+
+When user requests repository packaging:
+
+1. **Assess Requirements**
+   - Identify target repository (local/remote)
+   - Determine output format needed
+   - Check for sensitive data concerns
+
+2. **Configure Filters**
+   - Set include patterns for relevant files
+   - Add ignore patterns for unnecessary files
+   - Enable/disable comment removal
+
+3. **Execute Packaging**
+   - Run repomix with appropriate options
+   - Monitor token counts
+   - Verify security checks
+
+4. **Validate Output**
+   - Review generated file
+   - Confirm no sensitive data
+   - Check token limits for target LLM
+
+5. **Deliver Context**
+   - Provide packaged file to user
+   - Include token count summary
+   - Note any warnings or issues
+
+## Reference Documentation
+
+For detailed information, see:
+- [Configuration Reference](./references/configuration.md) - Config files, include/exclude patterns, output formats, advanced options
+- [Usage Patterns](./references/usage-patterns.md) - AI analysis workflows, security audit preparation, documentation generation, library evaluation
+
+## Additional Resources
+
+- GitHub: https://github.com/yamadashy/repomix
+- Documentation: https://repomix.com/guide/
+- MCP Server: Available for AI assistant integration