ExplainThisRepo is a CLI that generates plain-English explanations of public GitHub repositories by analyzing repository structure, README content, and selected high signal files.

It's helps developers understand unfamiliar repositories does by generating a structured EXPLAIN.md from real

• Understand unfamiliar repositories instantly through structural and architechural summaries by turning structure and code signals into a readable architectural summary
• Fetches public GitHub repositories automatically
• Analyzes real repository data including file tree, configs, entrypoints, and high signal source files
• Extracts repo signals from key files (package.json, pyproject.toml, config files, entrypoints)
• Builds a file tree summary to understand project architecture
• Detects programming languages via the GitHub API
• Accepts repositories via owner/repo, GitHub URLs (with or without https), issue links, query strings, and SSH clone links
• Generates a structured plain English explanation grounded in actual project files
• Outputs an EXPLAIN.md file in your current directory (default mode)
• Multi mode command-line interface

• (no flag) → Full repository explanation written to EXPLAIN.md

• --quick → One-sentence summary

• --simple → Short, easy explanation

• --detailed → Deeper explanation including structure and architecture

• --stack → Tech stack breakdown from repo signals

• --version → Show CLI version

• --help → Show usage guide

• --doctor → Check environmental health and API connectivity

ExplainThisRepo uses Gemini models for code analysis.

Set your API key as an environment variable.

macOS / Linux

export GEMINI_API_KEY="your_api_key_here"

Windows (PowerShell)

setx GEMINI_API_KEY "your_api_key_here"

Restart your terminal after setting the key.

Requirements: Python 3.9+

pip install explainthisrepo
explainthisrepo owner/repo

Alternatively,

pipx install explainthisrepo
explainthisrepo owner/repo

Install globally and use forever:

npm install -g explainthisrepo
explainthisrepo owner/repo
# or: npx explainthisrepo owner/repo

You don’t need to reformat links anymore.

ExplainThisRepo accepts GitHub repositories the way you actually copy them.

explainthisrepo https://github.com/owner/repo
explainthisrepo github.com/owner/repo
explainthisrepo https://github.com/owner/repo/issues/123
explainthisrepo https://github.com/owner/repo?tab=readme
explainthisrepo git@github.com:owner/repo.git

All inputs are normalized internally to owner/repo.

Generate a full explanation and saves it to EXPLAIN.md:

explainthisrepo owner/repo

Example:

explainthisrepo facebook/react

Get a one-sentence definition (prints only, no file created):

explainthisrepo owner/repo --quick

Example:

explainthisrepo facebook/react --quick

Generate a more detailed explanation (includes architecture / folder structure):

explainthisrepo owner/repo --detailed

Prints only the simple output (no EXPLAIN.md)

explainthisrepo owner/repo --simple

Get a tech stack breakdown detected from repo signals. No AI explanation. Prints only.

explainthisrepo owner/repo --stack

Print the installed version:

explainthisrepo --version

Check environment + connectivity (useful for debugging):

explainthisrepo --doctor

Termux has some environment limitations that can make pip install explainthisrepo fail to create the explainthisrepo command in $PREFIX/bin.

pip install --user -U explainthisrepo

Make sure your user bin directory is on your PATH:

export PATH="$HOME/.local/bin:$PATH"

Tip: Add the PATH export to your ~/.bashrc or ~/.zshrc so it persists.

Alternative (No PATH changes)

If you do not want to modify PATH, you can run ExplainThisRepo as a module:

python -m explain_this_repo owner/repo

Gemini support on Termux (Optional)

Installing Gemini support may require building Rust-based dependencies on Android, which can take time on first install:

pip install --user -U "explainthisrepo[gemini]"

Contributions are welcome!

If you find a bug, have an idea, or want to improve the tool:

• See CONTRIBUTING for setup and guidelines
• Open an issue for bugs/feature requests
• Or submit a pull request for fixes/improvements

This project is licensed under the MIT License. See the LICENSE file for details.

Caleb Wodi

• Email: caleb@explainthisrepo.com
• Twitter: @calchiwo
• LinkedIn: @calchiwo