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

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