Metadator

Automatically generate metadata for your Obsidian notes using Claude AI from Anthropic. The plugin analyzes your note content and generates tags, descriptions, and titles—with full customization for your workflow.

Features

• AI-Powered Metadata: Generate tags, descriptions, and titles using Claude AI
• Flexible Updates: Force update all fields or only fill in missing metadata
• Cost Optimization: Truncate content to limit API usage (save money on large notes)
• Customizable Fields: Rename metadata fields and add custom key-value pairs
• Multiple Models: Choose from Claude Sonnet 4.5, Opus 4.5, Sonnet 3.7, or Haiku 3.5
• Tag Extraction: Extract and manage existing tags from your vault
• Custom Prompts: Write your own instructions for tag/description/title generation

Installation

From Source (Development)

1. Clone this repository into your vault's plugins folder:

   cd /path/to/vault/.obsidian/plugins
   git clone https://github.com/markayers/metadator.git
   cd metadator

2. Install dependencies with Bun:

   bun install

3. Build the plugin:

   bun run build

4. Enable the plugin in Obsidian: Settings → Community Plugins → Metadator

Quick Start

Test the Plugin Immediately

A test Obsidian vault is already configured in this project directory.

1. Open the vault in Obsidian

   • Launch Obsidian
   • Click "Open folder as vault" (or "Open another vault")
   • Navigate to and select this project directory
   • Obsidian will open with the plugin already loaded

2. Configure your API key

   • Get an API key: Go to console.anthropic.com
   • Sign up or log in with billing enabled
   • Create a new API key
   • In Obsidian, go to Settings → Metadator
   • Paste your API key in the "API Key" field

3. Test with sample notes

   • Open Sample Note 1.md (about Obsidian)
   • Press Cmd/Ctrl + P to open Command Palette
   • Type "metadata" and select "Generate metadata for current note"
   • Watch the plugin analyze content and update frontmatter
   • Try Sample Note 2.md and Sample Note 3.md for other examples

4. Reload changes during development

   • After making code changes, run bun run dev for watch mode
   • In Obsidian, press Cmd/Ctrl + R to reload the plugin

Configuration

Metadata Settings

API Settings

• Model: Choose your Claude model
  • Sonnet 4.5 (recommended): Best balance of speed and quality
  • Opus 4.5: Most capable, slower and more expensive
  • Sonnet 3.7: Good balance of speed and cost
  • Haiku 3.5: Fastest and cheapest, good for simple notes

Update Method

• Always Regenerate: Re-run Claude on every command (regenerate all metadata fields)
• Preserve Existing (default): Only generate empty fields, preserve existing metadata

Content Truncation

Enable to reduce API costs on large notes:

• Truncate Content: Enable/disable content limiting
• Max Tokens: Maximum content length to send to Claude (default: 1000)
• Truncation Method:
  • Beginning Only: Send just the first N tokens
  • Beginning + End: Send start and end, omit middle
  • Headings: Send document outline plus first paragraph of each section

Token Counting Note: The plugin uses a simplified token counter that handles English words, CJK characters (Chinese, Japanese, Korean), and punctuation. It may differ slightly from Claude's actual tokenization (typically within 10-15%). If you set maxTokens: 1000, the plugin will send approximately 1000 tokens, but Claude might count slightly differently. To be conservative, set maxTokens lower than your comfort level.

Field Names

Customize what the frontmatter fields are called:

• Tags Field: Default tags
• Description Field: Default description
• Title Field: Default title

Prompts

Write custom instructions for Claude:

• Tags Prompt: How to select tags (e.g., "Choose 3-5 relevant tags")
• Description Prompt: How to write descriptions (e.g., "One sentence summary")
• Title Prompt: How to generate titles (e.g., "Concise title, max 10 words")

Custom Metadata

Add any additional metadata fields (e.g., author: Your Name, status: draft)

Usage

Generating Metadata for One Note

1. Open a note you want to add metadata to
2. Open Command Palette: Cmd/Ctrl + P
3. Search for "Metadator" and select "Generate metadata for current note"
4. Watch the plugin analyze your content and update the frontmatter

Example

Before:

---
---

# My Morning Routine

I wake up at 6am and start with a 20-minute meditation session. Then I exercise for 30
minutes, take a cold shower, and have a healthy breakfast. This routine has improved my
energy levels and focus throughout the day.

After:

---
tags:
  - habits
  - wellness
  - productivity
description: A morning routine focused on meditation, exercise, and nutrition to boost energy and focus
title: Morning Routine for Productivity
---

# My Morning Routine

[content unchanged...]

Development

Prerequisites

• Bun - Fast JavaScript runtime and package manager
• Node.js 18+ (via Bun)

Setup

# Install dependencies
bun install

# Development mode (watch mode with inline source maps)
bun run dev

# Production build (minified, optimized)
bun run build

# Type checking
bun run typecheck

# Linting and formatting
bun run check
bun run format

# Full validation (types, lint, format, build)
bun run validate

# Run unit tests
bun run test

For detailed development, architecture, and build information, see DEVELOPMENT.md.

Security & Privacy

API Key Storage

Your Anthropic API key is stored in your Obsidian vault's plugin data folder (~/.obsidian/plugins/metadator/data.json) in plain text. This is the standard way Obsidian plugins store settings, but be aware:

• Risk: If your vault folder is compromised, the API key could be exposed
• Mitigation:
  • Restrict permissions on your vault folder (not world-readable)
  • Store your vault on encrypted disk (macOS FileVault, Windows BitLocker, Linux LUKS)
  • Use a dedicated API key for this plugin (don't reuse your main key)
  • Revoke the key immediately if you suspect compromise

If you need higher security, consider using OS keychain integration (future enhancement—see CONCERNS.md #15).

Content Processing

Note content is sent to Anthropic's Claude API for metadata generation. This means:

• Your note text leaves your vault and is processed by Anthropic's servers
• Anthropic may retain API usage data per their privacy policy
• Review Anthropic's terms before using with sensitive content

Troubleshooting

Plugin Not Loading

• Check the developer console (Cmd/Ctrl + Shift + I) for errors
• Ensure main.js exists in the plugin directory
• Verify Obsidian version is 1.0.0 or higher
• Reload Obsidian (Cmd/Ctrl + R)

"Please configure your Anthropic API key"

• You haven't added an API key yet
• Go to Settings → Metadator and add your key
• Verify you have billing enabled on your Anthropic account

"Authentication failed"

• Your API key is incorrect or invalid
• Copy a fresh key from console.anthropic.com
• Ensure there are no extra spaces when pasting

"Rate limit exceeded"

• You're making requests too quickly
• Wait a moment and try again
• Consider using Haiku 3.5 for faster requests

No Metadata Generated

• Check the Developer Console (Cmd/Ctrl + Shift + I) for error details
• Ensure the note has enough content
• Try enabling "Always Regenerate" in settings
• Verify your API key is valid

Changes Not Appearing

• Ensure you saved the settings
• Try disabling and re-enabling the plugin
• Reload Obsidian (Cmd/Ctrl + R)

Release

1. Update version in package.json
2. Run bun run version to sync versions and bun run validate to verify
3. Commit and tag: git tag X.Y.Z && git push origin main --follow-tags
4. GitHub Actions automatically creates release with artifacts

License

MIT

Contributing

Contributions are welcome! Please follow these guidelines:

• Use Bun for package management
• Follow the existing code style (Biome formatting)
• Run bun run validate before submitting PRs
• Update documentation as needed

Support

If you encounter issues or have questions:

1. Check the troubleshooting section above
2. Review the developer console for error details
3. Open an issue on GitHub with details and error logs