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

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