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