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

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