Juggler

What is Juggler?

Juggler is a visual workbench for AI coding agents. It replaces the terminal transcript with a Finder-style Miller-column view where tool calls, approvals, thread structure and raw context are all visible and editable, and conversations branch into recursive sub-threads instead of scrolling logs. It runs as a native desktop app plus a matching headless Go server, so a session on a dev box can be opened from the desktop app or a browser and stay in sync. It is free to download, open source (AGPLv3 app, Apache-2.0 extension SDK), requires no Juggler account, and uses the Claude Code, Codex, Copilot, Gemini, Ollama or other provider subscriptions and API keys you already have.

Key features

• Miller-column (Finder-style) layout for tool calls, approvals, item properties and raw context — all part of the document and editable
• Conversations are persistent trees: branch at any point into recursive sub-threads; delegated threads return only their result to the parent context
• Every model transaction is inspectable: system prompt, messages, tool definitions, output, token use, timing and stop reason
• Sessions persist on disk and survive quits, crashes and reconnects — including an agent paused mid-run waiting for approval
• One live session, multiple synced clients (desktop app and browser) via a headless server where the code lives
• Extension SDK: tools (including read, write and bash), loop strategies, slash commands and file viewers are JavaScript extensions
• Fully inspectable MCP integration: schema offered to the model, generated arguments, approval, result, errors, server logs
• No Electron: native app + Go backend, type-checked JavaScript UI with no frontend build step; context is sized and compacted automatically before each call

Who it's for

• Developers running long coding-agent sessions who need to read, edit and branch substantial context rather than scroll a transcript
• Teams whose code lives on a dev box or server and want to attach a visual client to an always-running agent session
• Builders who want to audit exactly what an agent sent and received — raw requests, token use, MCP handoffs — before approving tool calls
• People extending their coding agent with custom tools, slash commands or viewers using the public JavaScript extension SDK

When not to use it

Juggler is not an agent itself — it brings its own interface and needs your existing Claude Code, Codex, Copilot, Gemini or other provider access, so if you want an all-in-one hosted agent platform or prefer staying purely in the terminal, it adds a layer you do not need.

FAQ