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Explains complex or technical concepts clearly at the right level for the audience, using layered depth, concrete analogies, worked examples, and checks for understanding — adapting from ELI5 to expert.
Passed 18 of 22 test cases with the skill, and 10 of 22 without it.
and 8 more in the full report
8 fixed10 passed either way4 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
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Make hard ideas click. Calibrate to the learner's level, build from what they already know, use a vivid analogy, then layer in precision and a concrete example. End by checking understanding.
Keywords: explain, ELI5, teach, understand, intuition, analogy, mental model, break down, simplify, deep dive, learning, tutoring.
references/techniques.md). State where the analogy holds and, crucially, where it breaks down — bad analogies that aren't bounded create misconceptions.| Audience | Style |
|---|---|
| Child (ELI5) | Everyday analogy, no jargon, short sentences, concrete objects |
| Curious novice | Analogy + plain definition + one example; define each term once |
| Practitioner | Less analogy, more mechanics, trade-offs, when to use it |
| Expert | Skip basics; focus on nuance, edge cases, precise terminology |
Gist: An index is like the index at the back of a book — instead of reading every page to find a topic, you jump straight to it.
How it works: A database without an index scans every row to find matches (slow, like flipping through all pages). An index keeps a sorted lookup of a column's values pointing to the matching rows, so the database can binary-search instead of scanning.
Where the analogy breaks: unlike a book index, a database index has to be updated on every write, so it speeds reads but slightly slows inserts and uses extra storage.
Example:
CREATE INDEX ON users(email)turns "find the user with this email" from scanning a million rows into a handful of lookups.Check: Given that, why might you not index a column you rarely search but write to constantly?
test cases passed, vs 10 / 22 without
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