Theme
Formats
Flow
Audio
Data Import
Card Instance
Field
Boxel Credit
Formula
Formats
Boxel Credit
Formula
Listing
Field
Vector
Canvas
Listing
Video
Boxel Credit
Formula
Issue
Font
Field
Query
HTML Prototype
Listing
Canvas
Font
Canvas
Query
Card Definition
Flow
Procedural 3D
Vector
3D Model
Canvas
Boxel Credit
Agent Session
Audio
Theme
Listing
Vector
Listing
Skill
Formats
Font
Vector
Card Instance
HTML Prototype
Vector
Hosting Config
Issue
Command
Hosting Config
Font
Procedural 3D
Card Definition
BFM Document
Formats
Audio
Theme
Card Instance
Query
Table
Issue
Card Instance
Issue
Formula
Agent Session
Query
Formula
Table
Formula
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Canvas
Formula
Card Definition
Data Import
Font
Canvas
Flow
Field
Font
Vector
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Vector
Procedural 3D
Published Site
Font
Command
3D Model
Card Instance
Boxel Credit
Procedural 3D
Video
Formats
Skill
Procedural 3D
Data Import
HTML Prototype
3D Model
HTML Prototype
Card Instance
BFM Document
Hosting Config
Formula
Listing
Data Import
BFM Document
Wiki
Theme
Issue
Card Definition
Command
Query
3D Model
Theme
Issue
Audio
Hosting Config
Published Site
Vector
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Card Definition
Wiki
Command
Published Site
Table
Canvas
Agent Session
Query
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Wiki
HTML Prototype
Wiki
Audio
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Procedural 3D
Canvas
Hosting Config
Flow
Agent Session
Published Site
Data Import
Card Instance
Theme
Command
HTML Prototype
Data Import
Query
Table
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Card Instance
Field
Canvas
Query
Audio
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BFM Document
Agent Session
Procedural 3D
Field
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Theme
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Video
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Formats
Agent Session
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Wiki
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Wiki
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Skill
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Font
Listing
Video
Command
Video
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HTML Prototype
Hosting Config
HTML Prototype
Canvas
Vector
Skill
Flow
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HTML Prototype
Video
Formats
Font
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Agent Session
Card Instance
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Skill
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3D Model
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Hosting Config
Formula

Build software with AI. Then actually use it.

Boxel is the collaboration space where you and your agent make working apps, documents, and tools — with real data, reusable code, and instant feedback.

Start Using View on GitHub
100% Open Source MIT License Remixable Bring Claude Code or Codex
AI Workspace

Give your agent a workspace, not just a chat window.

Chat forgets. A workspace accumulates — files, data, skills, and working software that both of you can see. And because code and data live side by side, the code you deposit upgrades what the workspace itself can do.

  1. STORE Documents and files

    14 files written — Word docs and PDFs, indexed and searchable.

  2. CODE Deposit code

    Ported to cards — source is in the workspace and the preview is live.

  3. DATA Import data

    812 rows became cards — faceted search is wired up.

  4. SKILLS Write skills

    Updated press-release.md — the skill now enforces one-sentence ledes.

  5. WORKSPACES Compartmentalize projects

    Found it in halden-legal — opening the card.

  6. AGENT Everything you’ve made

    Found PricingTable in nomad-coffee — linked into this project.

  7. CLOUD In the cloud

    In your realm on boxel.ai — synced, indexed, and backed up.

  8. SHARE Host and remix

    Live in host mode — visitors get the app, plus a Remix button.

Boxel — Documents and files
Documents and files
Boxel — Deposit code
Deposit code
Boxel — Import data
Import data
Boxel — Write skills
Write skills
Boxel — Compartmentalize projects
Compartmentalize projects
Boxel — Everything you’ve made
Everything you’ve made
Boxel — In the cloud
In the cloud
Boxel — Host and remix
Host and remix
Agent CLI

Use Boxel with the agent you already pay for, trust, and know.

Your agent interacts with the workspace through a full-featured CLI. You ask in plain English — it writes the boxel commands. Already pay for Claude Code or Codex? The open-source Boxel CLI connects them straight to your workspaces.

Works with
Claude Code Claude Code
OpenAI Codex OpenAI Codex

Quickstart — copy one prompt into your agent

Set up Boxel for me: install the CLI with `npm install -g @cardstack/boxel-cli`, connect my account with `boxel profile add` (Production, app.boxel.ai), and add the Boxel skills with `/plugin marketplace add cardstack/boxel` then `/plugin install boxel-cli`. Verify by running `boxel realm list` and show me my workspaces.

Paste it into Claude Code or Codex — your agent runs the install, connects your account, and confirms.

View on GitHub — MIT licensed, open source
claude — ~/halden-shop

All Commands

realm create Spin up a new workspace
realm pull Download a workspace to your machine
realm push Upload local changes to Boxel
realm sync Bidirectional sync with conflict resolution
realm watch Pull server-side changes in real-time
realm history Checkpoints, undo, and restore
realm publish Publish a live, public copy — host mode
realm ingest-card Copy a card and its deps from any realm
file read / write Read and write individual realm files
lint Lint a whole workspace, or one file
parse Type-check cards before you push
test Run card test suites headlessly
search Federated search across workspaces
run-command Run a host command from the CLI
realm list Browse your workspaces
profile Manage accounts and environments
AI-Native Stack

Legacy stacks weren't built for AI.

Built on Cardstack

AI excels at reading and writing files. So we built an architecture where one file type defines your entire application—schema, templates, relationships, and commands.

  • Two file types: JSON for data, TypeScript for logic
  • AI-native formats: Both are in every LLM's training corpus
  • One file, all layers: Schema, UI, and logic live together
Architecture

One file. Full stack.

Five traditional layers—frontend, backend, API, database, orchestration—compressed into TypeScript + JSON.

Gallery image 1
Memory

Workspace memory that persists.

In other tools, chat IS your project. Lose the chat, lose the work. Boxel inverts this: the workspace remembers, sessions are disposable helpers you summon and discard.

Gallery image 1
Database

The database that builds itself.

Data is just JSON. AI outputs JSON, we index it automatically into a queryable database. No Supabase, no migrations, no SQL.

Gallery image 1
Context

AI that understands your app.

Current AI tools are "brains in a jar"—floating outside your actual data. Boxel's assistant reads your schema, inspects your Cards, and accesses code when needed.

Gallery image 1

What will you build?

The transition from human-written to AI-generated software will be one of the most significant shifts in technology history. The constraint isn't architecture anymore. It's imagination.

Explore

Open a workspace and ask the AI to build something.

Remix

Browse the catalog for components that match your needs.

Extend

Hit a limitation? Switch to Code Mode and fix it.

Contribute

Build a skill, publish a template, share what you've learned.

Start Using Read the White Paper