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

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