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

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