Threadlines: an open-source desktop workspace for Codex and Claude Code

[badcuban]

I built Threadlines to make long-running coding-agent work easier to see and recover when several projects, threads, terminals, branches, and previews are active at once.

Threadlines is a free, MIT-licensed desktop workspace for the locally installed Codex CLI and Claude Code. Version 0.3.0 is now live as a stable release for macOS, Windows, and Linux.

It brings these surfaces together:

• persistent project threads with recovery across restarts;
• project files, terminals, diffs, and visual Git history;
• a tabbed browser that Codex and Claude can navigate with explicit approvals;
• page annotations and exact browser context attached directly to prompts;
• in-place handoffs between Codex and Claude using a recap plus the current working tree;
• prompt stashing, active/wrapped inbox state, and subagent transcript inspection.

Under the hood, the Codex path uses codex app-server over JSON-RPC. Provider events enter an event-sourced Node server, are projected into SQLite, and stream to a React/Electron client over WebSockets.

Threadlines began as a fork of T3 Code. It retains the upstream Git history and MIT attribution, but now has its own provider orchestration, desktop release pipeline, source-control workflow, and product direction.

Website and downloads:
https://www.threadlines.dev/

Source:
https://github.com/Threadlines/threadlines

v0.3.0:
https://github.com/Threadlines/threadlines/releases/tag/v0.3.0

No Threadlines account is required; each provider is installed and authenticated normally. Threadlines is an independent community project and is not affiliated with or endorsed by OpenAI or Anthropic.

I would especially value feedback on two boundaries: whether provider handoffs preserve enough context, and whether browser navigation approvals expose the right amount of control without becoming noisy.