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+# X Space Downloader - Design Document
+
+**Date:** 2025-10-26
+**Status:** Approved
+
+## Overview
+
+A Python CLI tool that downloads X (Twitter) Space recordings and outputs them as MP3 files. Takes a Space URL as input and produces an audio file.
+
+## Requirements
+
+- **Input:** X Space recording URL (e.g., `https://x.com/i/spaces/1ZkKzZWnVRRKv`)
+- **Output:** MP3 audio file
+- **Interface:** Command-line tool
+- **Authentication:** Supports X account credentials via cookies
+- **Scope:** Recordings only (not live Spaces)
+- **Error Handling:** Clear error messages for invalid or non-recording URLs
+
+## Architecture Overview
+
+### Technology Choices
+
+- **Language:** Python
+- **Core Engine:** yt-dlp (handles X authentication and media extraction)
+- **CLI Framework:** Click (argument parsing and user interface)
+- **Pattern:** Thin wrapper around yt-dlp
+
+### Project Structure
+
+```
+x-space-downloader/
+├── src/
+│   ├── __init__.py
+│   ├── main.py          # CLI entry point with argument parsing
+│   ├── downloader.py    # Wraps yt-dlp functionality
+│   └── validator.py     # URL validation and error handling
+├── tests/
+│   ├── test_validator.py
+│   └── test_downloader.py
+├── requirements.txt     # Dependencies: yt-dlp, click
+├── setup.py            # Makes it installable
+└── README.md
+```
+
+### User Workflow
+
+```bash
+x-space-dl --cookies cookies.txt https://x.com/i/spaces/1ZkKzZWnVRRKv
+# Output: space_1ZkKzZWnVRRKv.mp3
+```
+
+## Component Design
+
+### validator.py
+
+**Responsibilities:**
+- Validate URL format (must match X Spaces pattern: `https://x.com/i/spaces/{SPACE_ID}`)
+- Check if URL points to a recording vs live Space
+- Return clear error messages for invalid inputs
+
+**Key Interface:**
+```python
+def validate_space_url(url: str) -> Tuple[bool, Optional[str], Optional[str]]:
+    """
+    Validates X Space URL.
+
+    Returns:
+        (is_valid, space_id, error_message)
+    """
+```
+
+### downloader.py
+
+**Responsibilities:**
+- Configure yt-dlp options (format: mp3, quality, output template)
+- Pass cookie file to yt-dlp for authentication
+- Translate yt-dlp output/errors to user-friendly messages
+- Show download progress
+
+**Key Interface:**
+```python
+def download_space(
+    space_url: str,
+    output_dir: str,
+    cookies_file: Optional[str]
+) -> str:
+    """
+    Downloads Space recording using yt-dlp.
+
+    Returns:
+        Path to downloaded MP3 file
+    """
+```
+
+**yt-dlp Configuration:**
+- Output format: mp3 (audio only)
+- Output template: `space_{space_id}.mp3`
+- Post-processing: convert to mp3 if needed
+- Progress hooks for user feedback
+
+### main.py
+
+**Responsibilities:**
+- CLI argument parsing with Click
+- Orchestrate validation → download flow
+- Handle and display errors appropriately
+- Exit with appropriate status codes
+
+**CLI Arguments:**
+- `URL` (required): X Space URL
+- `--cookies` (optional): Path to cookies file
+- `--output` (optional): Output directory (default: current directory)
+
+**Exit Codes:**
+- `0`: Success
+- `1`: Invalid URL
+- `2`: Download failed
+- `3`: Authentication required
+
+## Data Flow
+
+1. User provides URL + optional cookies file
+2. **Validator** checks URL format → extracts space_id
+3. **Downloader** configures yt-dlp with:
+   - Output format: mp3 (audio only)
+   - Output template: `space_{space_id}.mp3`
+   - Cookies file if provided
+   - Post-processing: convert to mp3 if needed
+4. yt-dlp fetches metadata, downloads audio stream, converts to mp3
+5. Return file path to user
+
+## Error Handling
+
+| Error Scenario | Detection | User Message |
+|----------------|-----------|--------------|
+| Invalid URL format | Validator regex check | "Invalid URL format. Expected: https://x.com/i/spaces/{SPACE_ID}" |
+| Space doesn't exist | yt-dlp 404 error | "Recording not found. Check URL or Space may be deleted." |
+| Authentication required | yt-dlp auth error | "Authentication required. Please provide cookies file with --cookies" |
+| Network errors | yt-dlp timeout/connection | "Network error. Check connection and try again." |
+| Space is live | Validator metadata check | "Error: This is a live Space, not a recording." |
+| Disk space/permissions | File system errors | "Cannot write to output directory. Check permissions and disk space." |
+
+## Authentication
+
+**Cookie-based Authentication:**
+- User exports cookies from logged-in X session
+- Provides cookie file path via `--cookies` flag
+- yt-dlp uses cookies for authenticated requests
+
+**Cookie Export Instructions:**
+- Browser extensions: "Get cookies.txt", "cookies.txt"
+- Manual: Export via browser DevTools
+- Instructions included in README
+
+## Testing Strategy
+
+**Unit Tests:**
+- Validator: Test various URL formats, valid/invalid patterns
+- Error message generation
+
+**Integration Tests:**
+- Full download flow with yt-dlp
+- Use test Space URLs or mock yt-dlp calls
+- Cookie authentication flow
+
+**Error Scenario Tests:**
+- Invalid URLs
+- Missing cookies
+- Network failures
+- Live Space detection
+
+## Dependencies
+
+**Core:**
+- `yt-dlp`: Media downloading and extraction
+- `click`: CLI framework
+
+**Development:**
+- `pytest`: Testing framework
+- `pytest-mock`: Mocking for tests
+
+## Future Considerations (Out of Scope)
+
+- Live Space recording
+- Batch downloading multiple Spaces
+- GUI interface
+- Format options beyond MP3
+- Metadata extraction (speakers, title, description)