Open source shouldn't have a language barrier. Lang Bolt is for contributors who want to participate but struggle with the language, and for maintainers who need to manage issues and pull requests from people who don't speak their language.
Connect your GitHub repos, get AI onboarding docs in any language, translate markdown files, and let the bot handle in-repo translation and summarization — so the language gap stops being a blocker.
- GitHub bot — install lang-bolt on your org, and it auto-translates issues, summarizes threads, and labels by language
- GitHub auth — sign in with GitHub, import public or private repos
- Repo indexing — indexes your codebase into a vector store for semantic search
- AI onboarding docs — generate contributor-ready docs from your codebase in any selected language
- Markdown translation — translate any markdown file in a repo, download as individual files or a ZIP
- AI chat — ask questions about the repo, browse issues and PRs, find relevant code — all in your language
- Site-wide UI translation — the entire app interface translates to your preferred language automatically
- MCP server — use Lingo Bolt tools directly inside your IDE (Cursor, VS Code, etc.) to browse issues, translate docs, and summarize in your language
Install the GitHub App on your account or org. The bot responds to @lang-bolt mentions in issues and PRs.
@lang-bolt translate to spanish
Translates the issue or PR body and posts a reply.
@lang-bolt summarize
Summarizes in the maintainer's default language.
@lang-bolt summarize in french
Summarizes in a specific language.
- Auto-label — detects the language of new issues and adds a label like
lang:chinese - Auto-translate — translates new issues and comments into the maintainer's default language
Manage installations and preferences at /bot.
Runs as a remote HTTP server inside the web app — no separate build step, no env vars in your IDE config. Just start the app and point your IDE at it.
| Tool | What it does |
|---|---|
list_issues |
List issues with titles translated to your language |
get_issue |
Fetch a full issue with comments, translated |
translate_doc |
Translate any file (README, CONTRIBUTING, etc.) |
translate_text |
Translate arbitrary text between languages |
search_codebase |
Semantic search across an indexed repo's code |
get_onboarding |
Fetch AI-generated onboarding docs for a repo |
Show me open issues for facebook/react in Spanish
Get issue #42 from vercel/next.js in Hindi
Translate the README of expressjs/express to Japanese
Search the codebase of my-org/my-repo for authentication logic
Start the app (pnpm dev), then add to .cursor/mcp.json:
{
"mcpServers": {
"lang-bolt": {
"type": "remote",
"url": "http://localhost:3000/api/mcp"
}
}
}See SETUP.md for full details.
- Next.js (App Router) + React 19
- Lingo.dev API for translation
- tRPC + TanStack Query
- Better Auth
- Prisma + PostgreSQL
- Qdrant (vector store)
- OpenAI (embeddings + generation)
- Tailwind CSS + shadcn/ui
- Turborepo + PNPM workspaces
apps/web Next.js app (UI + route handlers)
packages/api tRPC routers + indexing/retrieval logic
packages/auth Better Auth setup
packages/db Prisma schema + Docker services
packages/env Shared runtime env validation
packages/config Shared TypeScript config
packages/mcp MCP server for IDE integration
See SETUP.md for full local setup instructions including GitHub OAuth, GitHub App configuration, ngrok for webhooks, and environment variables.