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

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