Create flashcards from PDFs with Claude Code or Codex using Loudwalk’s Mac CLI
Loudwalk’s macOS app ships with a built-in command-line interface (cards add, edit, import) that accepts JSON and enforces strict duplicate detection — so coding agents like Claude Code or Codex can turn lecture PDFs, papers, or codebase docs directly into FSRS-6 decks.
Key takeaways
- Built into the Mac app binary: run Loudwalk.app/Contents/MacOS/Loudwalk cards add|edit|import with one JSON object per call — no Python add-ons, AnkiConnect server, or API keys required.
- Idempotent for AI agents: Loudwalk’s duplicate check on the question field is case- and accent-insensitive and refuses duplicates rather than merely warning, so a retried agent loop never creates duplicate cards.
- Instant iCloud Drive sync: cards added via the Mac CLI are scheduled with the target deck’s FSRS-6 parameters and sync automatically to your iPhone for your next walk.
Disclosure: This guide is published by Loudwalk (iOS 26 or later and Apple silicon Mac · macOS 26 or later). Free and built-in Anki methods are covered first with links to Anki’s official manuals. Loudwalk is independent of Anki and is not affiliated with Ankitects.
Why coding agents are great at writing flashcards (when given a real CLI)
Writing good flashcards from a 40-page paper, lecture handout, or technical specification is tedious when you have to copy-paste between a PDF viewer, a chat window, a CSV file, and an import dialog.
Terminal agents like Claude Code and Codex can already read PDFs, Markdown notes, and source repositories directly. All they need to build a great deck is a deterministic local CLI that validates input, rejects duplicates, and schedules cards properly.
The Loudwalk macOS CLI
Every copy of Loudwalk for Mac (Apple silicon Mac · macOS 26 or later) includes a command-line interface inside the app bundle:
/Applications/Loudwalk.app/Contents/MacOS/Loudwalk cards add|edit|importYou can also install Loudwalk on macOS via Homebrew:
brew install --cask n2ctech/tap/loudwalkWhy it is designed for AI agent loops
| Design choice | How the CLI behaves | Why it matters when an agent drives it |
|---|---|---|
| One JSON object per call | Structured JSON input for add, edit, and import | No fragile CSV escaping, broken quotes, or delimiter bugs |
| Strict duplicate refusal | Normalizes case and accents on the question and refuses duplicates | An agent that retries or resumes a half-finished run never adds a card twice |
| Deck FSRS-6 inheritance | New cards automatically inherit their target deck’s FSRS-6 parameters | Cards enter your queue with the right desired retention and learning steps |
| iCloud Drive sync | App picks up CLI changes on its next sync and mirrors to iPhone | Generate cards on your Mac at 8:00 AM, walk with them on your iPhone at 8:05 AM |
Prompting Claude Code or Codex for spoken flashcards
When you ask Claude Code or Codex to turn a PDF or Markdown file into Loudwalk cards, tell it to optimize the cards for spoken active recall:
- Full-sentence questions: Ask a clear, self-contained question that makes sense by ear without seeing a heading on a page.
- One-breath answers: Keep the answer side to a single fact, mechanism, date, or concise definition (1–2 sentences max) so spoken grading is unambiguous.
- One fact per card: Split multi-part lists into separate cards focused on distinct retrieval cues.
Example instruction you can give Claude Code in your terminal:
Read lecture-04.pdf and add 25 atomic flashcards to my Loudwalk deck using /Applications/Loudwalk.app/Contents/MacOS/Loudwalk cards. Write every question as a natural spoken sentence and keep every answer concise enough to say in one breath on a walk.Studying new agent-generated cards on a walk
By default, a Loudwalk voice session asks cards that are already in your learning or review queue so you meet brand-new cards on screen first. When you generate a fresh deck from a PDF and want the voice tutor to introduce those new cards directly on your walk, open the deck’s Options and turn on “Ask new cards on a walk”.
Frequently asked questions
How is Loudwalk’s CLI different from AnkiConnect?
AnkiConnect requires Anki Desktop to be open and running a local HTTP server via a third-party Python add-on. Loudwalk’s CLI is compiled directly into the signed macOS app binary (/Applications/Loudwalk.app/Contents/MacOS/Loudwalk) and writes safely to your collection with built-in duplicate rejection.
What happens if Claude Code retries a batch of cards?
Loudwalk’s CLI performs a strict duplicate check on the question field that ignores case and accents and refuses duplicates rather than emitting a soft warning. Re-running a batch adds only the cards that are not already present.
Can I also import a CSV from Gemini, ChatGPT, or a spreadsheet?
Yes. Loudwalk’s Mac and iPhone apps import standard CSV files just like Anki does, including preserving bold and italic formatting from Gemini or Markdown exports.
TRY IT ON YOUR OWN DECKS
Your cards already exist. Take them outside.
Free on-screen review forever · 7-day (150-card) voice trial, no payment card · iPhone and Mac.