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

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