Stop reading about the answer. Get scored on it.
Every guide here ends in a free puzzle that grades your answer as a percentage of a provably optimal solution — context packing, RAG tuning, routing, orchestration, caching. No login to see your score.
The context-window interview is a 0/1 knapsack. Learn the relevance-per-token model that beats greedy's 76% — free, no-login puzzle included.
Designing a production agent is min-cost planning, not fewest tool-calls. Learn the model — free, no-login puzzle that scores your plan vs the optimum.
“Just use bigger chunks” fails — chunk size has a sweet spot under a latency budget. Learn how to choose it, with a free no-login puzzle scored vs the optimum.
Prompt (prefix) caching vs KV caching, and the ordering rule that cuts your token bill. Free no-login puzzle scores your prompt layout vs the optimum.
Don’t route every call to the biggest model — match capability to need. Learn cheapest-capable routing, with a free no-login puzzle scored vs the optimum.
Under a context cap, summarising a bulky-useful turn beats keeping it whole or dropping it. Learn the model — free no-login puzzle scored vs the optimum.
Is your RAG answer wrong because retrieval missed the chunk, or because the model ignored it? Diagnose first, then fix — with a free no-login retrieval puzzle.
Evals are the new system design. Pick a representative eval set for marginal coverage, not raw size — with a free no-login puzzle scored vs the optimum.
Hand off only when the specialist’s saving beats the handoff cost — never-switching and always-switching both overpay. Free no-login puzzle scored vs the optimum.
Guardrail catch rates compound, so a few decent checks clear a high safety bar — running everything is wasted latency. Free no-login puzzle scored vs the optimum.
A cheap flaky call backed by a reliable fallback beats one premium call — in expected cost. Learn the ordering math, with a free no-login puzzle scored vs the optimum.
Assigning N agents to N tasks for minimum total cost is a matching problem — per-agent greedy collides on shared favourites. Free no-login puzzle scored vs the optimum.