alexei-led/exploring-repos

Explore GitHub Repositories with DeepWiki

DeepWiki provides AI-generated wiki documentation for 30,000+ popular public GitHub repositories — architecture overviews, design patterns, component relationships, and semantic Q&A powered by Cognition's Devin.

When to Use DeepWiki vs Context7

• Repo architecture, design patterns, how components connect — DeepWiki (AI-generated wiki from full codebase analysis)
• API references, code examples, version-specific docs — Context7 (sourced from official library documentation)
• "How does this repo work?" — DeepWiki (codebase-level understanding)
• "How do I use this library?" — Context7 (usage-level documentation)
• Cross-repo comparison — DeepWiki ask_question with multiple repos (accepts up to 10 repos)

Workflow

Step 1 — Understand the repository structure

Call mcp__deepwiki__read_wiki_structure with repoName in owner/repo format to get the topic list:

mcp__deepwiki__read_wiki_structure({ "repoName": "langchain-ai/langchain" })

Step 2 — Read relevant topics

Call mcp__deepwiki__read_wiki_contents for detailed documentation on the repo:

mcp__deepwiki__read_wiki_contents({ "repoName": "langchain-ai/langchain" })

Step 3 — Ask targeted questions

Call mcp__deepwiki__ask_question for semantic Q&A about specific aspects:

mcp__deepwiki__ask_question({
  "repoName": "langchain-ai/langchain",
  "question": "How does the retrieval chain pipeline work?"
})

For cross-repo questions, pass an array (max 10):

mcp__deepwiki__ask_question({
  "repoName": ["langchain-ai/langchain", "run-llama/llama_index"],
  "question": "How do these frameworks handle document chunking differently?"
})

Query Strategies

Start broad, then narrow

1. read_wiki_structure — scan available topics
2. read_wiki_contents — read the full wiki for an overview
3. ask_question — drill into specifics

For architecture understanding

• "What is the high-level architecture?"
• "How do the core modules interact?"
• "What design patterns are used?"
• "How is error handling structured?"

For implementation reference

• "How does X feature handle Y edge case?"
• "What is the authentication/authorization flow?"
• "How are database migrations managed?"
• "What testing patterns are used?"

For cross-repo comparison

• Pass multiple repos to ask_question
• Ask about specific architectural differences
• Compare approaches to the same problem

Examples

# Understand a framework's architecture
read_wiki_structure: "vercel/next.js"
ask_question: "vercel/next.js" — "How does the app router handle server components?"

# Compare two similar projects
ask_question: ["expressjs/express", "fastify/fastify"] — "How do these handle middleware differently?"

# Explore a tool's internals
read_wiki_structure: "hashicorp/terraform"
ask_question: "hashicorp/terraform" — "How does the provider plugin system work?"

# Understand patterns in a Go project
ask_question: "kubernetes/kubernetes" — "How is the controller pattern implemented?"

Fallback: Repository Not Indexed

DeepWiki indexes 30,000+ popular public repos. If a repo is not indexed:

DeepWiki returns empty or error?
├── Check repo name format (must be "owner/repo")
├── Try the canonical repo name (not a fork)
├── Still not indexed?
│   ├── Any public repo → gh CLI (works for all GitHub repos)
│   ├── Popular library → Try Context7 for docs instead
│   ├── Open-source repo → Clone + local exploration
│   └── Niche/private → Perplexity for general info

Fallback Strategies

1. GitHub CLI — works for any public repo, no indexing needed:

   # Quick overview: description, stars, language, topics
   gh repo view owner/repo
   
   # Full file tree (find key directories, config files)
   gh api repos/owner/repo/git/trees/main?recursive=1 --jq '.tree[].path'
   
   # Read specific files (README, go.mod, package.json, Makefile)
   gh api repos/owner/repo/contents/README.md --jq '.content' | base64 -d
   
   # Search for patterns across the repo
   gh search code "func main" --repo owner/repo --limit 20
   
   # Search for repos by topic, language, or description
   gh search repos "kubernetes operator" --language go --sort stars
   
   # Recent activity: issues, PRs, releases
   gh release list --repo owner/repo --limit 5
   gh issue list --repo owner/repo --state open --sort comments --limit 10
   

   Best for: file tree exploration, finding entry points, reading key files, searching code patterns, checking recent activity. Combine multiple gh calls to build a mental model when DeepWiki is unavailable.

2. ctx7 — for library API documentation:

   ctx7 library fastify "middleware"
   ctx7 docs /fastify/fastify "middleware"
   

   Use npx ctx7@latest (or bunx ctx7@latest) when ctx7 is not globally installed. The context7-cli skill wraps this workflow.

3. Perplexity — for repos not in DeepWiki or Context7:

   mcp__perplexity-ask__perplexity_ask({
     "messages": [{ "role": "user", "content": "Explain the architecture of <owner/repo>" }]
   })
   

4. Direct exploration — clone and read:

   git clone --depth=1 <repo-url>
   # Use scoped local tools: fd for files, rg for text; use dedicated analysis tooling for structural evidence
   

Combining with Context7

DeepWiki and Context7 are complementary. A typical research flow:

1. DeepWiki — understand the architecture and design decisions
2. Context7 — get specific API references and code examples
3. DeepWiki ask_question — clarify how specific APIs fit into the larger design

Do not use DeepWiki when:

• You need version-specific API syntax → use Context7
• You need official getting-started guides → use Context7
• The repo is private or very new (<1 month) → use Perplexity or local exploration