Learn vocabulary with OpenClaw

Vocabulary slips away because of timing. Hermann Ebbinghaus mapped the pattern in the 1880s: you meet a word, you understand it for an afternoon, and then it fades on the schedule described by the forgetting curve, fastest in the first day or two unless something pulls it back. Spaced repetition is the fix: review a word just as you are about to forget it, and each successful recall buys you a longer gap before the next one.

The research backing that approach is large. A 2006 meta analysis by Cepeda and colleagues in Psychological Bulletin looked at 254 studies comparing spaced practice against massed practice and found spaced schedules outperformed cramming in 259 of 272 direct comparisons. Piotr Woźniak turned the idea into a practical algorithm with SM-2 in 1987, which powers Anki and most flashcard apps today. It works, and it is tedious to run by hand.

The apps that automate it make a trade you might not want. A course like Duolingo decides which words you see and when, which is fine until the word you need is the one on a menu or in a song that the curriculum never covers.

Duolingo Super runs $83.99 per year on the U.S. App Store according to Subscription Land's pricing tracker, and Babbel's annual plan runs about $107 per year. Anki hands you the real spaced repetition engine for free on desktop and Android, but you end up managing decks and note types, and the iPhone app costs a one time $25 while the others are free. Your Operator.io agent can run the same idea on the words you choose, in a file you keep, and quiz you in the channel you already use.

How it works

You send the vocabulary coach prompt, and the agent sets up the list and the review loop in one go:

• It creates a CSV in its workspace with the word, its translation, an example sentence, the date you added it, how many times you have recalled it, and the date it is next due.
• When you add a word, it checks the file first so the same one never lands twice, then files it with an example sentence.
• A few times a day it quizzes you, but only on the words that are due.
• Get one right and it pushes the next review further out; miss it and the word comes back sooner, which is spaced repetition running itself.

New words only enter the rotation when you add them, so the list grows at the pace you set rather than one an app decides for you. The whole system is a file you can open and sort to see which words are sticking and which keep tripping you up.

The prompt

This is the instruction the agent acts on:

Be my vocabulary coach. Create a spreadsheet in your workspace, a CSV with
columns for the word, its translation, an example sentence, the date I added it,
how many times I have gotten it right, and when it is next due for review. When I
give you a new word, check the file first so you never add the same one twice,
then add it. Set up an automation that quizzes me here a few times a day on the
words that are due, and based on whether I get each one right, pushes its next
review further out or brings it sooner, the way spaced repetition works. Before
you start, ask me which language I am learning, my level, how many new words to
introduce a day, and when to quiz me.

You can pull this prompt from the prompts library and send it to your agent rather than typing it out.

Using it day to day

The point of keeping your own list is that you feed it from real life. You hear a word on a podcast, see one in a recipe, get corrected by a friend, and you drop it to the agent, which checks the file so it does not log a word you already have and then files it with an example sentence. From then on it shows up in your reviews on schedule.

The quizzes come to you in your channel at the times you chose, and you answer the way you would text anyone back. Because the history is a file the agent controls, you can also steer it: ask it to drill only the words you keep missing, to quiz you on a specific set before a trip, to add a second example sentence for a word that has not stuck, or to tell you how many words you have banked this month. It works from the CSV rather than guessing.

The spacing follows the principle rather than a published algorithm to the letter. A word you get right moves further out, a word you miss comes back sooner, and the gap grows as your streak on a word grows. It is approximating the expanding schedule that SM-2 formalizes inside Anki, not reproducing the ease factors and exact intervals that engine tracks.

If you want a precise schedule, a review at one day, then three, then a week, tell the agent those intervals and it follows yours instead of its own judgment. For picking up the words you actually run into, the looser version holds up.

Dual coding helps retention: pairing a word with an example sentence in context, not just a bare translation, gives your memory two hooks instead of one. Tell the agent to write the example in the register you actually need, formal for business Japanese, casual for Spanish with friends, and the reviews stay closer to how you will use the word.

Why a CSV beats another language app

A course app is good at starting you off and keeping you motivated. What no course does is review the specific words you ran into today, because its job is to march you through its own curriculum.

Anki hands you a powerful engine, yet most people bounce off the deck management. Duolingo Super drops ads and hearts, Babbel runs structured grammar focused lessons across 14 languages, and both pick the vocabulary for you.

The agent fills the space those tools leave. Your list is a CSV you own, holding the exact words you decided were worth learning, with the spacing handled for you and the quizzes arriving where you already talk. It adds no subscription beyond the OpenClaw you already run, and there is nothing to export later because it was a file all along. It is the review layer a course app skips, aimed at the words you met this week instead of a fixed syllabus.

When you are ready, open the prompts library and send the vocabulary coach to your agent. It asks which language you are learning and how often to quiz you, then the reviews start arriving in your channel on schedule.