Plainhub MCP server

PlainHub

Your notes, in your own GitHub. A plain-text editor for your GitHub repos, with Markdown support. Every save is a Git commit, and AI helps you edit.

Website · ▶ 30-second intro (YouTube) · Documentation · 日本語ドキュメント

⭐ If PlainHub helps you, please star this repo — your support directly powers new features.

PlainHub is an AI-driven online editor that makes GitHub simple for everyone. No Git knowledge required. Open, edit, save — directly to your repo. Handles huge files with ease. Control GitHub with natural language — just tell the AI what you want. For engineers and non-engineers alike, working together in the same place.

Why PlainHub

• GitHub-native — Your files are saved only in your own GitHub repository. PlainHub doesn't store them.
• File contents never pass through PlainHub's servers — Reading and saving go directly between your browser and the GitHub API. Sign-in uses a small server step — see the privacy policy.
• BYOK (Bring Your Own Key) — Use your own AI API keys (e.g., Anthropic Claude). Keys stay in your browser, never sent to PlainHub servers.
• AI for idea development — Brainstorm, write, and edit alongside an AI assistant. Voice input and TTS read-aloud supported.
• Frontend for GitHub — Like github.dev, but for non-engineers. A notepad with version control built in.

Features

Edit from your phone

Open a note on your phone, fix a line, and it is saved — as a commit in your own repository.

Editor

• Markdown 3-mode editing — Code / Visual (WYSIWYG) / Preview
• Syntax highlighting — Markdown, JSON, YAML, and more
• Undo / Redo — Full edit history
• Line numbers, auto-indent, line wrapping — Configurable
• Whitespace visualization — Toggle invisible characters
• Keyboard shortcuts — VS Code-style shortcuts (Ctrl+S, Ctrl+Z, etc.)

File Management

• Create / rename / duplicate / delete files and folders
• File history — View past versions with diff
• Sync & conflict resolution — Real-time sync with GitHub
• Image paste — Paste images directly, auto-upload to repo
• Cross-repo search — Search across all your repositories

Integration

• CLI — plainhub open -r from your terminal
• MCP Server — Control from AI IDE (Claude Code, Cursor, VS Code)
• Deep linking — Share URLs with theme, font size, line number settings
• PWA — Install as native app on desktop and mobile

Design

• Dark / Light theme — Automatic or manual
• Mobile responsive — Full-featured on phone and tablet

Quick Start

Web

Visit plainhub.dev and sign in with GitHub.

CLI

npm install -g plainhub
plainhub auth --from-gh
plainhub open README.md -r owner/repo

MCP Server (AI IDE)

npm install -g plainhub
claude mcp add plainhub -- plainhub-mcp

Then say: "Open the README in owner/repo on PlainHub"

Documentation

Shortened. The full README is on GitHub.