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

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