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

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