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mtg-builder/AGENTS.md
Tuan-Dat Tran 31a4995bbe feat: add deck builder with multiple collection support
- Add build_deck.py script for automated deck building
- Support multiple collection files for comprehensive deck building
- Rename main collection file to full_collection.json
- Add comprehensive documentation and usage examples
- Include design and implementation plans
- Enhance synergy detection and commander suggestion
2026-03-03 23:23:44 +01:00

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# AGENTS.md
Guide for AI assistants working on this codebase.
## Build/Verify Commands
This project has no external dependencies or test framework.
```bash
# No lint/typecheck commands currently
# Verify scripts work by running them:
python hydrate.py --help
python scripts/analyze_decks.py --help
```
## Code Style
- **Language:** Python 3 (stdlib only, no external packages)
- **Formatting:** 4-space indent, max line length ~100
- **Imports:** Standard library only (argparse, json, pathlib, urllib, re, sys, os, time)
- **CLI:** Use `argparse` with subparsers for multi-command tools
- **Error handling:** Print to stderr, use sys.exit(1) for failures
- **Docstrings:** Triple-quoted at module and function level with usage examples
- **Type hints:** Optional but encouraged for complex functions
## Project Structure
```
├── hydrate.py # Main CLI - fetches card data from Scryfall
├── cache/
│ └── card_cache.json # Local cache of Scryfall card data
├── output/
│ ├── deck_analysis.json # Analysis output
│ └── hydrated/ # Enriched card data by type
│ ├── deck.json # All cards combined
│ ├── commander.json
│ ├── creatures.json
│ ├── instants.json
│ ├── sorceries.json
│ ├── artifacts.json
│ ├── enchantments.json
│ ├── lands.json
│ └── planeswalkers.json
├── data/
│ ├── collection/ # Raw decklist text files
│ └── decks/ # Deck definitions (JSON)
│ └── <deck_name>.json # name, commander, colors, archetype, cards
├── scripts/
│ ├── analyze_decks.py # Find upgrade options for decks
│ ├── find_synergies.py # Search for synergistic cards
│ ├── parse_deck.py # Parse text decklists to JSON
│ └── deck_report.py # Generate markdown reports
└── docs/
└── templates/ # Documentation templates
```
## Data Formats
### Deck JSON (`data/decks/*.json`)
```json
{
"name": "Deck Name",
"commander": "Commander Name",
"colors": ["U", "G", "W"],
"archetype": "Theme Description",
"cards": {
"Card Name": count,
...
}
}
```
### Card Data (`output/hydrated/*.json`)
Array of card objects with Scryfall fields:
- `name`, `mana_cost`, `cmc`, `colors`, `color_identity`
- `type_line`, `oracle_text`, `power`, `toughness`, `loyalty`
- `scryfall_uri`, `count`
## Extension Guide
### Adding a New Deck
1. Create `data/decks/<name>.json` with required fields
2. Run `python scripts/update_docs.py` to regenerate documentation
### Adding a New Script
1. Create `scripts/<name>.py` with argparse CLI
2. Follow existing patterns: `load_collection()`, argparse with --help
3. Update README template with usage example
4. Run `python scripts/update_docs.py`
### Modifying Deck Analysis
- `scripts/analyze_decks.py`: Core logic for finding upgrades
- Color identity matching uses `color_identity` field from Scryfall
- Cards are categorized by `type_line`
## Current Decks
| Deck | Colors | Commander | Archetype |
|------|--------|-----------|-----------|
| my_choco_deck | BUW | G'raha Tia, Scion Reborn | Auto-generated |
| Choco | UGW | Choco, Seeker of Paradise | Bird Tribal Landfall |
| Hazel | BG | Hazel of the Rootbloom | Golgari Aristocrats |
| Palamecia | UR | The Emperor of Palamecia // The Lord Master of Hell | Izzet Self-Mill Storm |
| Yshtola | UBW | Y'shtola, Night's Blessed | Esper Stax Drain |