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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
+├── card_cache.json         # Local cache of Scryfall card data
+├── deck_analysis.json      # Analysis output
+├── collection/             # Raw decklist text files
+├── collection_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
+├── 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 (`decks/*.json`)
+
+```json
+{
+  "name": "Deck Name",
+  "commander": "Commander Name",
+  "colors": ["U", "G", "W"],
+  "archetype": "Theme Description",
+  "cards": {
+    "Card Name": count,
+    ...
+  }
+}
+```
+
+### Card Data (`collection_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 `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_TABLE}}
diff --git a/docs/templates/README.template.md b/docs/templates/README.template.md
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+# MTG EDH Deck Manager
+
+Command-line toolkit for managing Magic: The Gathering Commander (EDH) decks using the Scryfall API.
+
+## Installation
+
+```bash
+git clone <repo-url>
+cd Decks
+```
+
+No dependencies required - pure Python 3 standard library.
+
+## Usage
+
+### Hydrate a Collection
+
+Fetch card data from Scryfall for a decklist:
+
+```bash
+python hydrate.py hydrate collection/decklist.txt -o collection_hydrated/ -c card_cache.json
+```
+
+### Create a New Deck
+
+```bash
+python hydrate.py new my_deck
+```
+
+### Analyze Decks
+
+Find upgrade options from your collection:
+
+```bash
+python scripts/analyze_decks.py --collection collection_hydrated/deck.json --deck-dir decks/
+```
+
+### Find Synergies
+
+Search for cards by keywords, colors, and type:
+
+```bash
+# Find landfall cards in Simic colors
+python scripts/find_synergies.py --collection collection_hydrated/deck.json --colors U G --keywords landfall
+
+# Find Bird creatures in Bant colors
+python scripts/find_synergies.py --collection collection_hydrated/deck.json --colors U G W --creature-type Bird
+
+# Find instants with CMC 2 or less
+python scripts/find_synergies.py --collection collection_hydrated/deck.json --type instant --cmc-max 2
+```
+
+### Generate Reports
+
+```bash
+python scripts/deck_report.py --collection collection_hydrated/deck.json --decks-dir decks/ --output report.md
+```
+
+## Decks
+
+{{DECK_TABLE}}
+
+## Workflow
+
+1. **Import** - Place text decklists in `collection/`
+2. **Hydrate** - Run `hydrate.py` to fetch Scryfall data → `collection_hydrated/`
+3. **Define** - Create deck JSON files in `decks/`
+4. **Analyze** - Run `analyze_decks.py` to find upgrade options
+5. **Report** - Use `deck_report.py` for markdown summaries
+
+## Collection Stats
+
+{{COLLECTION_STATS}}
+
+---
+
+*This file is auto-generated. Edit `docs/templates/README.template.md` instead.*