Cate: An Infinite Canvas IDE Built for Coding Agents

By Prahlad Menon 4 min read

The explosion of coding agents — Claude Code, Codex CLI, Aider, and others — has created a new problem: how do you manage five agents working on five different tasks at once?

Traditional IDEs weren’t built for this. Tabs pile up. Terminals blur together. You lose track of which agent is waiting for input and which is still churning through a refactor.

Cate is a new open-source IDE that treats agent orchestration as a first-class concern. Its core innovation: an infinite zoomable canvas where terminals, editors, browsers, and docs float as spatial objects rather than cramped tabs.

Mission Control for Your Agents

The killer feature: agent-aware terminals. Cate detects when you’re running Claude Code, Codex, or similar CLIs and surfaces their state visually:

  • Running — agent is working
  • Finished — task complete
  • Waiting — needs your input (triggers OS notification)

When you spin up parallel git worktrees, each gets its own colored territory on the canvas. Five agents on five branches stay five visibly separate workstreams — not a pile of indistinguishable tabs.

What’s Inside

Beyond the canvas metaphor, Cate is a full IDE:

  • Monaco editors with syntax highlighting, multi-cursor, diffs, and Markdown preview
  • Embedded browser panels that agents can control via CLI (screenshots, accessibility snapshots, click/type automation)
  • In-app agent chat (Pi) with multiple LLM backends: Anthropic, OpenAI, Gemini, OpenRouter, Groq, Mistral, DeepSeek
  • Git tooling: staging, branches, worktrees, history, inline diffs, full-text search
  • Remote workspaces via SSH — terminals and agents run remotely through a lightweight daemon
  • Document viewers for PDFs, DOCX, and images

Panels can float anywhere on the infinite canvas, dock into tabs/splits, or detach into separate OS windows. Layouts persist across restarts.

The Worktree Workflow

The parallel-worktree feature deserves special mention. When you describe a task, Cate:

  1. Creates a git worktree with its own branch
  2. Assigns it a distinct color
  3. Carves out visual territory on the canvas
  4. Optionally symlinks .env or node_modules into the new worktree

This makes it trivial to have multiple agents working on separate features simultaneously without stepping on each other — each worktree is an isolated sandbox with its own terminal cluster on the canvas.

Agent-Drivable Browser

The built-in browser isn’t just for viewing docs. Agents can control it via the cate CLI:

cate browser open https://example.com
cate browser screenshot
cate browser snapshot  # accessibility tree
cate browser click --ref "button#submit"

This enables agents to perform web tasks — testing, scraping, form filling — without external dependencies.

Extension System

Cate supports third-party panels via isolated webviews. The cate-extensions repo hosts community extensions including MCP servers, diagram tools, and more.

Technical Stack

Under the hood:

  • Electron 41 + React 18 + Zustand 5 for state
  • Monaco 0.52 for editing, xterm.js 5.5 + node-pty for terminals
  • Tailwind 3.4 for styling
  • PDFs via pdf.js, DOCX via mammoth, git via simple-git
  • The embedded coding agent is built on @earendil-works/pi

Cross-platform: macOS (DMG, ZIP), Windows (NSIS, ZIP), Linux (AppImage, DEB, tar.gz).

Who This Is For

Cate shines if you:

  • Run multiple coding agents simultaneously
  • Want visual clarity on which agent needs attention
  • Prefer spatial organization over tab hierarchies
  • Work with parallel feature branches regularly
  • Need remote workspace support

The infinite canvas metaphor takes some adjustment if you’re coming from VS Code or JetBrains, but the payoff is real once you’re juggling 4+ agent sessions.

Getting Started

Download from GitHub Releases. Open a folder and it becomes a workspace. Right-click to add panels, Cmd+K for the command palette, drag panels to dock them.

No config files required.

Links:

The IDE landscape is evolving rapidly as coding agents become central to development workflows. Cate makes a strong bet that spatial organization beats linear tabs when you’re orchestrating multiple autonomous workers. Worth a look if your terminal is becoming a wall of Claude Code sessions.