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

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