I run multiple Claude Code sessions daily across different projects and it would get pretty messy - no visibility into costs, agents stepping on each other's files, context lost between sessions. So I built Myrlin, baking in a bunch of QoL features I wish I had. It’s a Browser-based workspace manager that sits on top of Claude Code:

- 4-pane embedded terminals (xterm. js + node-pty) for side-by-side sessions

- Real-time cost tracking - parses Claude's JSONL session logs per model

- Conflict detection - warns when multiple agents edit the same files

- Session templates, workspace docs, 13 themes

- Auto-discovers every Claude session you've ever run

Everything local. No cloud, no accounts, no telemetry. One command:

“npx myrlin-workbook”

GitHub: https://github.com/therealarthur/myrlin-workbook

Would love feedback on the UI or features you'd wan to see. Happy to answer architecture questions. Thanks!