# datamodellm

Lets the agent draft database schemas in Prisma format for the DataModelLM visual editor. Useful when you want an ERD or a data model before writing code.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · ★ 1979
- Author: nimbalyst
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/nimbalyst/nimbalyst/tree/HEAD/packages/extensions/datamodellm/claude-plugin/skills/datamodellm/SKILL.md
- Updated: 2026-10-25
- HTML: https://affpapa.org/en/nevibecode/skills/datamodellm

## What it does

The skill teaches an agent to produce `.prisma` files that the DataModelLM editor from Nimbalyst can open. That editor draws an entity-relationship diagram on a canvas while keeping the source as plain Prisma text. The agent writes and edits the models; you look at the picture.

Every file has to open with a metadata comment, `// @nimbalyst {...}`, holding canvas settings and entity positions. Skip that line and the editor shows nothing. After it comes ordinary Prisma: a `datasource db` block with a provider and `url = env("DATABASE_URL")`, then the models. The skill covers scalar types such as `Int`, `String`, `DateTime` and `Json`, the `?` and `[]` modifiers, and attributes like `@id`, `@unique`, `@default`, `@updatedAt`, `@relation`.

Three relationship shapes get their own sections: one-to-many, one-to-one, and implicit many-to-many. Explicit relations need `@relation` with `fields` and `references`; leave it out and no line appears between the entities. Keep the file in the project root, or in `models/` or `schema/`.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add nimbalyst/nimbalyst --skill datamodellm -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/datamodellm/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/datamodellm/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add nimbalyst/nimbalyst --skill datamodellm -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/datamodellm/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add nimbalyst/nimbalyst --skill datamodellm -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/datamodellm/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install nimbalyst/nimbalyst datamodellm
```

2. **Manually: put the files in place**
- File: `.github/skills/datamodellm/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add nimbalyst/nimbalyst --skill datamodellm -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/nimbalyst/nimbalyst --path packages/extensions/datamodellm/claude-plugin/skills/datamodellm
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/datamodellm/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add nimbalyst/nimbalyst --skill datamodellm -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/nimbalyst/nimbalyst/tree/HEAD/packages/extensions/datamodellm/claude-plugin/skills/datamodellm/SKILL.md

## When to use it
- design a database schema before the first migration
- draw an entity-relationship diagram for existing tables
- write Prisma models from scratch
- wire entities together with `@relation`
- add `createdAt` and `updatedAt` to every model

## Example prompts
- Create `schema.prisma` with User and Post models linked one-to-many
- Add a Profile model with a one-to-one relation to User
- Check that every model has an `@id` and an `updatedAt` timestamp

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 46cbb7ef6c6dfd9b.

BEGIN THIRD-PARTY FILE 46cbb7ef6c6dfd9b
````text
---
name: datamodellm
description: Create visual data models for database schemas using Nimbalyst's DataModelLM editor. Use when the user wants to design a data model, database schema, entity relationship diagram, or Prisma schema.
---

# DataModelLM - Visual Data Modeling

DataModelLM is Nimbalyst's visual editor for creating database schemas using Prisma format. It displays entity-relationship diagrams with a visual canvas.

## When to Use DataModelLM

- Designing database schemas
- Creating entity relationship diagrams (ERDs)
- Planning data models for applications
- Working with Prisma schemas
- Any visual data modeling task

## File Format

- **Extension**: `.prisma`
- **Format**: Prisma schema with special metadata header
- **Location**: Any directory (commonly workspace root or `models/`, `schema/`)

### Required Header

Every DataModelLM file MUST start with a `@nimbalyst` metadata comment:

```prisma
// @nimbalyst {"viewport":{"x":0,"y":0,"zoom":1},"positions":{},"entityViewMode":"standard"}
```

### Basic Structure

```prisma
// @nimbalyst {"viewport":{"x":0,"y":0,"zoom":1},"positions":{},"entityViewMode":"standard"}

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

model User {
  id        Int      @id @default(autoincrement())
  email     String   @unique
  name      String?
  posts     Post[]
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
}

model Post {
  id        Int      @id @default(autoincrement())
  title     String
  content   String?
  published Boolean  @default(false)
  author    User     @relation(fields: [authorId], references: [id])
  authorId  Int
  createdAt DateTime @default(now())
}
```

## Supported Types

### Scalar Types
- `Int`, `BigInt`, `Float`, `Decimal`
- `String`, `Boolean`
- `DateTime`, `Json`, `Bytes`

### Modifiers
- `?` - Optional field
- `[]` - Array/list

### Attributes
- `@id` - Primary key
- `@unique` - Unique constraint
- `@default(value)` - Default value
- `@updatedAt` - Auto-update timestamp
- `@relation` - Define relationships

## Relationship Patterns

### One-to-Many
```prisma
model User {
  posts Post[]
}
model Post {
  author   User @relation(fields: [authorId], references: [id])
  authorId Int
}
```

### One-to-One
```prisma
model User {
  profile Profile?
}
model Profile {
  user   User @relation(fields: [userId], references: [id])
  userId Int  @unique
}
```

### Many-to-Many (Implicit)
```prisma
model Post {
  categories Category[]
}
model Category {
  posts Post[]
}
```

## Best Practices

1. **Always include the @nimbalyst header** - Required for visual editor
2. **Use meaningful model names** - PascalCase, singular (User not Users)
````
END THIRD-PARTY FILE 46cbb7ef6c6dfd9b

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