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

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