therealarthur/myrlin-workbook

Open-source workspace manager for AI coding CLIs: Claude Code and ChatGPT Codex in one browser app. Discovers every session on disk, embedded terminals, phone-ready, cost tracking, kanban, docs. Windows, macOS, Linux.

What it solves

Myrlin's Workbook is a workspace manager designed to solve the friction of using AI coding CLIs (like Claude Code and ChatGPT Codex). It addresses common pain points such as the inability to name sessions, the difficulty of managing multiple concurrent terminal windows, the lack of a clear cost tracking system for token usage, and the risk of file conflicts when multiple sessions edit the same codebase.

How it works

The tool scans local session directories (e.g., ~/.claude/projects/) to discover existing AI sessions and organizes them into a three-level hierarchy: Categories, Projects, and Focuses. It provides a browser-based GUI (or a TUI mode) that embeds real PTY terminals via xterm.js and node-pty, allowing users to run and switch between multiple AI sessions in a single grid. It tracks costs by parsing JSONL usage data and monitors system resources (CPU/RAM) per session.

Who it’s for

Developers who use AI coding agents in their terminal and need a more structured way to organize their work, track their spending, and manage multiple concurrent AI-driven development tasks without switching between numerous terminal tabs.

Highlights

  • Multi-provider support: Unified interface for Claude Code and ChatGPT Codex.
  • Embedded Terminal Grid: A 4-pane grid of real PTY terminals with persistent tab groups.
  • Cost Tracking: Detailed per-session and per-project breakdowns of input, output, and cache tokens.
  • Project Management: Integrated Kanban boards, per-project Markdown documentation, and AI-generated session summaries.
  • Conflict Detection: Real-time warnings when multiple sessions are editing the same files.
  • Git Integration: One-click creation of branches and worktrees combined with new AI sessions.
  • Local-first: Everything runs locally with no cloud telemetry.

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