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-# CLAUDE.md
-
-This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
-
-## Project Overview
-
-Atomizer is an Obsidian plugin that breaks down large notes into smaller "atomic" notes using the OpenAI API. The plugin integrates with Obsidian's UI, providing a ribbon icon and command palette entry to process notes.
-
-## Development Commands
-
-```bash
-# Development mode with watch
-npm run dev
-
-# Production build (runs TypeScript type checking first)
-npm run build
-
-# Version bump (updates manifest.json and versions.json)
-npm run version
-```
-
-## Architecture
-
-### Core Flow
-
-1. User triggers atomization via ribbon icon or command palette
-2. `AtomizerPlugin` (main.ts:68) validates settings and note content
-3. `ConfirmationModal` (modals.ts) prompts user for confirmation
-4. `OpenAIService` (openai-service.ts:22) sends content to OpenAI API with system prompt
-5. Response is split by `<<<>>>` delimiter into individual atomic notes
-6. `NotesManager` (notes-manager.ts:26) saves each note to the configured output folder
-
-### Key Components
-
-**AtomizerPlugin (main.ts)**
-- Main plugin entry point extending Obsidian's `Plugin` class
-- Registers ribbon icon, command, and settings tab
-- Orchestrates the atomization workflow in `atomizeNote()` method
-- Handles error display and API error responses
-
-**OpenAIService (openai-service.ts)**
-- Manages OpenAI API communication
-- Constructs system prompt with YAML frontmatter template including:
-  - Date/time stamp
-  - Configurable tags (atomized tag + custom tags)
-  - Backlink to source note using `[[${sourceFilePath}]]` format
-- Uses `<<<>>>` as note separator in prompt and response parsing
-
-**NotesManager (notes-manager.ts)**
-- Handles file system operations for generated notes
-- Extracts title from first `# Heading` in each note
-- Ensures unique filenames by appending counters when needed
-- Creates output folder if it doesn't exist
-
-**Settings (settings.ts)**
-- Defines `AtomizerSettings` interface and `DEFAULT_SETTINGS`
-- Provides settings UI with:
-  - OpenAI API key (required)
-  - Model selection (gpt-4o-mini or gpt-4o)
-  - Output folder path
-  - Toggle for "atomized" tag
-  - Custom tags (comma-separated)
-
-### Important Implementation Details
-
-**Note Delimiter**: The system uses `<<<>>>` as a separator between atomic notes. This is embedded in the OpenAI system prompt and used to split the response.
-
-**Frontmatter Generation**: Each atomic note includes YAML frontmatter with:
-- Date: Human-readable format (ISO with space instead of T)
-- Tags: Conditionally includes "atomized" tag + custom tags
-- Source: Obsidian wiki-link format `[[filename]]` pointing back to original note
-
-**Title Extraction**: Notes must start with a level 1 heading (`# Title`) after frontmatter. The title is extracted using regex: `/^#\s+(.+)$/m`
-
-**Browser API Usage**: OpenAI client uses `dangerouslyAllowBrowser: true` flag since this runs in Obsidian's Electron environment.
-
-## Build System
-
-- **Bundler**: esbuild (configured in esbuild.config.mjs)
-- **Entry point**: src/main.ts
-- **Output**: main.js (root directory)
-- **Development**: Watch mode with inline sourcemaps
-- **Production**: Minified, no sourcemaps, tree-shaking enabled
-- **Target**: ES2018 (CommonJS format)
-- **External dependencies**: Obsidian API and all CodeMirror packages are marked external
-
-## TypeScript Configuration
-
-- Strict mode enabled with comprehensive type checking
-- `noUncheckedIndexedAccess` is enabled for safer array access
-- No emit (esbuild handles compilation)
-- Inline source maps in development
-
-## Network Requests
-
-This plugin makes external API calls to OpenAI (api.openai.com). User content is sent to OpenAI for processing. A notice is displayed to users before making requests.