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

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