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

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