Key takeaways
- Full development environment per agent — terminal (ghostty-web), Monaco editor, and Git worktree all in one window
- Cron-based automation lets you schedule agent tasks without manual intervention
- Open source and free — built by a solo developer, no commercial lock-in
FAQ
What is Constellagent?
Constellagent is a free, open-source macOS app that lets you run multiple AI coding agents in parallel, each in its own isolated Git worktree with dedicated terminal and editor.
Does Constellagent support Claude Code?
Yes. Constellagent provides a full terminal emulator (ghostty-web + node-pty) where you can run Claude Code, Codex, or any CLI-based agent.
Is Constellagent free?
Yes. Constellagent is open source and free with no commercial tiers.
Executive Summary
Constellagent is an open-source macOS desktop app for running multiple AI coding agents in parallel.[1] Unlike minimal wrappers, each agent session gets a full development environment — terminal emulator, Monaco code editor, Git worktree management, and file navigation — unified in a single window.
| Attribute | Value |
|---|---|
| Creator | Owen Gretzinger (@owengretzinger) |
| Founded | 2026 |
| Funding | None (indie project) |
| Employees | 1 (solo developer) |
| Location | Canada |
Product Overview
Constellagent isolates each agent in its own Git worktree with a dedicated terminal and Monaco-based code editor.[1] The result is a self-contained workspace per agent — no file conflicts, no branch confusion, each agent operating independently.
The app also supports cron-based automation scheduling, letting you configure agents to run on a timer for repetitive tasks.
Key Capabilities
| Capability | Description |
|---|---|
| Isolated Worktrees | Each agent gets its own Git worktree for conflict-free parallel work |
| Terminal Emulator | Full ghostty-web + node-pty terminal per session |
| Monaco Editor | Syntax highlighting, diffs, inline editing |
| Git Integration | Staging, committing, branching, worktree management |
| File Tree | Navigate project files within each workspace |
| Cron Scheduling | Automate recurring agent tasks |
| Keyboard-Driven | Quick Open, tab switching, shortcuts |
Product Surfaces / Editions
| Surface | Description | Availability |
|---|---|---|
| macOS App | Desktop application | GA (DMG) |
| Source Code | Build from source | Open Source |
Technical Architecture
Built with Bun, SvelteKit, and Electron.[1] The terminal uses ghostty-web (a WebGL-accelerated terminal emulator) with node-pty for process management.
Key Technical Details
| Aspect | Detail |
|---|---|
| Deployment | Local macOS app |
| Model(s) | Agent-agnostic (CLI-based) |
| Terminal | ghostty-web + node-pty |
| Editor | Monaco (VS Code engine) |
| Build | Bun + SvelteKit |
| Open Source | Yes (GitHub) |
Installation:[1]
bun run setup
bun run dev
# Or build signed DMG:
bun run dist
Strengths
- Full environment per agent — Terminal, editor, Git, file tree all unified
- Native ghostty terminal — WebGL-accelerated, feels snappy
- Monaco editor built-in — Syntax highlighting, diffs, no external editor needed
- Cron automation — Schedule recurring agent tasks
- Open source — No lock-in, fork and customize
- Free — No subscription, no account required
- Clean UX — Side-by-side workspace layout with keyboard shortcuts
Cautions
- macOS only — No Windows or Linux support
- Solo developer — Project longevity depends on one person
- Very new — Limited production validation (February 2026 release)
- 106 GitHub stars — Small community compared to established tools
- No issue integration — Doesn't connect to Linear, Jira, or GitHub Issues
- No cloud execution — Local only, agents stop when app closes
- No enterprise features — No team collaboration, signed commits, or SSO
Pricing & Licensing
| Tier | Price | Includes |
|---|---|---|
| Open Source | Free | Full functionality |
Licensing model: Open source (free)
Hidden costs: Agent CLI subscriptions required (Claude Pro, OpenAI, etc.)
Competitive Positioning
Direct Competitors
| Competitor | Differentiation |
|---|---|
| Emdash | Emdash has issue integration and 20+ agents; Constellagent has integrated editor |
| Conductor | Conductor is simpler; Constellagent has full Monaco editor and cron |
| Crystal | Crystal has A/B testing; Constellagent has cron scheduling |
When to Choose Constellagent Over Alternatives
- Choose Constellagent when: You want an all-in-one workspace (terminal + editor + Git) per agent with cron scheduling
- Choose Emdash when: You need issue tracker integration or Best-of-N comparisons
- Choose Conductor when: You prefer simpler UX without editor features
Ideal Customer Profile
Best fit:
- Solo developers wanting unified agent workspaces
- Those who want built-in Monaco editor with diff views
- Developers needing cron-scheduled agent automation
- Open source advocates
Poor fit:
- Teams needing collaboration features
- Windows or Linux users
- Enterprises requiring compliance features
- Users needing issue tracker integration
Viability Assessment
| Factor | Assessment |
|---|---|
| Financial Health | N/A — Unfunded indie project |
| Market Position | Niche — Small but differentiated |
| Innovation Pace | Moderate — Active development, solo maintainer |
| Community/Ecosystem | Limited — 106 stars, early adopters only |
| Long-term Outlook | Uncertain — Depends on maintainer commitment |
Constellagent is a thoughtful indie project but lacks the resources of funded competitors. Success depends on community adoption and maintainer dedication.
Bottom Line
Constellagent stands out by providing a full development environment per agent — not just terminals, but integrated Monaco editing, Git management, and cron scheduling. For developers who want everything in one window without juggling external editors, it's an elegant solution.
Recommended for: Solo Mac developers who want an all-in-one parallel agent workspace with built-in editor and cron automation.
Not recommended for: Teams, enterprises, or anyone needing issue tracker integration, cloud execution, or cross-platform support.
Outlook: A promising indie project that fills a niche. Watch for community growth — if it gains traction, could become a serious Tier 2 contender.
Research by Ry Walker Research • methodology
Disclosure: Author is CEO of Tembo, which competes in the agent orchestration space.