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