repo-explore

name	repo-explore
description	Clone and explore external GitHub repositories to understand how libraries, frameworks, or dependencies work. Use when user provides a GitHub URL (github.com/owner/repo), asks "how does X library work", wants to look at source code for a dependency, asks about implementation details of an external package, or says "explore", "look at", or "check out" a repository. Automatically checks out the matching version tag when the repo is a dependency in the current project.
context	fork
allowed-tools	["Bash(git:*)","Bash(ls:*)","Read","Glob","Grep","Task"]

Repo Explore Skill

Explore external GitHub repositories by cloning them locally and using the Explore agent for comprehensive codebase analysis.

Cache Location

~/.cache/claude/repos/<owner>/<repo>/

Workflow

1. Parse Repository URL

Extract owner and repo from various formats:

• https://github.com/owner/repo
• [e-mail]:owner/repo.git
• owner/repo (shorthand)
• github.com/owner/repo

2. Check Cache

ls ~/.cache/claude/repos/<owner>/<repo>/

• If exists: Check if update needed (see references/update-reference.md)
• If not exists: Proceed to clone

3. Clone Repository

mkdir -p ~/.cache/claude/repos/<owner>
git clone https://github.com/<owner>/<repo>.git ~/.cache/claude/repos/<owner>/<repo>

4. Version Detection

Before exploring, check if this repo is a dependency in the current working directory.

Consult references/version-detection.md for:

• Which dependency files to check
• How to extract versions from each format
• How to map versions to git tags

If a matching version is found:

cd ~/.cache/claude/repos/<owner>/<repo>
git fetch --all --tags
git checkout <tag>

Common tag formats to try:

• v1.2.3
• 1.2.3
• release-1.2.3
• release/1.2.3

5. Explore with Explore Agent

Use the Task tool with subagent_type=Explore to answer questions about the repository, rather than browsing files yourself. The Explore agent is optimized for:

• Finding files by patterns
• Searching code for keywords
• Understanding codebase architecture
• Answering questions about how code works

Example:

Task(
  subagent_type="Explore",
  prompt="""In ~/.cache/claude/repos/owner/repo/, find how authentication is implemented.

Requirements for your response:
- Include code snippets with file paths and line numbers
- Show key type definitions and function signatures
- End with a 'Key Files for Further Exploration' table with columns: File, Purpose, Start Here If...
"""
)

6. Response Format Requirements

When answering questions about the repository, include:

Code Snippets

• Include relevant code snippets that directly support the answer
• Show actual type definitions, function signatures, and key logic
• Use proper syntax highlighting with language identifier
• Include file path and line numbers for each snippet:

  // File: pkg/controller/foo.go:42-58
  func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
      // ... relevant code
  }
  

File Recommendations for Further Reading

At the end of every response, include a "Key Files for Further Exploration" section:

## Key Files for Further Exploration

| File | Purpose | Start Here If... |
|------|---------|------------------|
| `pkg/apis/v1/types.go` | Core type definitions | You want to understand the data model |
| `pkg/controller/main_controller.go` | Main reconciliation logic | You want to understand the control flow |
| `docs/design.md` | Architecture decisions | You want high-level understanding |

Guidelines for file recommendations:

• Prioritize files by relevance to the question asked
• Include 3-7 files (not too few, not overwhelming)
• Add context on why each file is useful
• Include "Start Here If..." guidance to help with future exploration
• Order from most fundamental to most specific

Response Structure Template

1. Brief answer summary (2-3 sentences)
2. Detailed explanation with inline code snippets
3. Architecture/flow diagrams if helpful (ASCII or description)
4. Key Files for Further Exploration table
5. Optional: Related topics the user might want to explore next

7. Updates

For refreshing the repository or switching versions, consult references/update-reference.md.

Notes

• Verify the checkout succeeded before exploring
• If the user asks about a specific version, checkout that version even if not a dependency
• For private repos, the clone will work if the user has git credentials configured
• Large repos may take time to clone; inform the user