Clear
Your agent needs to work with a user's data, but that data is scattered and inconsistent across systems, giving it a fragmented view.
How would you design the system to build a coherent view from fragmented user data?
General Medium

Answer:

  1. Unify data sources: Aggregate the user's data across systems, so the view is complete.

  2. Resolve inconsistencies: Reconcile conflicting records, so the view is coherent.

  3. Deduplicate: Merge redundant data about the user, so the picture isn't fragmented.

  4. Rank source authority: Prefer authoritative sources on conflict, so the unified view is reliable.

  5. Flag unresolved gaps: Surface where data is missing or conflicting, so the view's limits are known.

Your agent works, but you can't tell whether recent quality changes are real or just noise from natural output variance.
How would you design the system to distinguish real quality changes from noise?
General Medium

Answer:

  1. Establish a baseline distribution: Know normal variance, so real shifts stand out.

  2. Test for significance: Use enough samples to distinguish signal from noise, so changes are trustworthy.

  3. Run repeated evals: Measure multiple times, so variance is averaged out.

  4. Compare against control: Hold a stable reference, so changes are relative to a constant.

  5. Track trends, not single points: Look at sustained movement, so one-off noise doesn't mislead.

Your agent needs to handle a request that fails, and the user retries, but the retry hits the same failure with no improvement.
How would you design the system to make retries more likely to succeed?
General Medium

Answer:

  1. Diagnose the failure: Understand why it failed, so the retry can address the cause.

  2. Vary the approach: Change strategy on retry rather than repeating, so you don't hit the same wall.

  3. Use failure feedback: Feed the error into the retry, so the next attempt is informed.

  4. Try alternative paths: Route retries differently, so a failing path isn't just repeated.

  5. Communicate on persistent failure: Tell the user when retrying won't help, so they aren't stuck looping.

Your agent works, but its answers sometimes reflect an outdated version of a fact because it cached the answer, not the underlying data.
How would you design the system to cache in a way that respects data freshness?
General Medium

Answer:

  1. Cache data, not just answers: Cache underlying data with its own freshness, so answers reflect current data.

  2. Tie cache validity to data: Expire answer caches when their source data changes, so stale answers aren't served.

  3. Key caches by data version: Include data version in cache keys, so changed data misses stale cache.

  4. Verify freshness on serve: Check the cached answer's data is still current, so staleness is caught.

  5. Set appropriate TTLs: Match cache lifespan to how fast data changes, so freshness and efficiency balance.

Your agent needs to handle a decision where waiting for more data improves accuracy but costs time, and it never knows when to stop gathering.
How would you design the system to decide when enough information has been gathered?
General Medium

Answer:

  1. Define sufficiency criteria: Specify what constitutes enough information, so stopping is principled.

  2. Assess marginal value: Judge whether more data would change the answer, so gathering stops when it won't.

  3. Weigh cost against benefit: Balance the time of gathering against accuracy gained, so you stop economically.

  4. Set gathering limits: Cap how long to collect, so it doesn't run indefinitely.

  5. Act on sufficient confidence: Proceed once confidence is adequate, so you don't over-gather.

Your agent works, but it can't distinguish between a user who wants a quick answer and one who wants to explore a topic deeply.
How would you design the system to detect and serve exploratory versus transactional intent?
General Medium

Answer:

  1. Detect intent mode: Recognize whether the user wants a quick answer or deep exploration, so handling fits.

  2. Serve transactional fast: Give direct answers to quick queries, so they aren't over-served.

  3. Support exploration: Offer depth, follow-ups, and tangents for exploratory intent, so curiosity is served.

  4. Adapt as it shifts: Switch modes when intent changes mid-conversation, so you stay aligned.

  5. Let users signal: Allow explicit mode choice, so intent isn't only inferred.

Your agent needs to serve results that must be consistent for the same user, but load balancing sends their requests to instances with different cached state.
How would you design the system to keep per-user behavior consistent across instances?
General Medium

Answer:

  1. Centralize user state: Store per-user state in a shared store, so all instances see the same thing.

  2. Avoid instance-local state: Keep user-affecting state out of individual instances, so behavior doesn't vary.

  3. Use consistent routing where needed: Pin a user to an instance if local state matters, so consistency holds.

  4. Synchronize caches: Share or invalidate caches across instances, so cached state doesn't diverge.

  5. Monitor cross-instance consistency: Detect when a user gets inconsistent behavior, so drift surfaces.

Your agent works, but its retrieval quality varies because embedding quality differs across the languages your documents are in.
How would you design the system to handle uneven embedding quality across languages?
General Medium

Answer:

  1. Use strong multilingual embeddings: Choose models with good cross-language coverage, so quality is more even.

  2. Measure per language: Track retrieval quality by language, so weak ones surface.

  3. Supplement weak languages: Add keyword search or translation where embeddings falter, so coverage holds.

  4. Consider per-language models: Use specialized embeddings for underserved languages, so quality improves.

  5. Test across languages: Evaluate retrieval per language, so gaps are caught.

Your agent needs to handle a request where partial results are useful, but it withholds everything until the entire task completes.
How would you design the system to deliver useful partial results progressively?
General Medium

Answer:

  1. Stream as ready: Deliver results incrementally, so users get value before completion.

  2. Order by usefulness: Return the most useful parts first, so early results matter most.

  3. Mark completeness: Signal what's partial versus final, so users know what to trust.

  4. Let users act on partials: Enable acting on early results, so they aren't blocked waiting.

  5. Complete in the background: Finish remaining work while users use partials, so nothing is lost.

Your agent is mature, but its accumulated prompts, rules, and special cases have become so tangled that changes are risky and slow.
How would you design the process to safely reduce accumulated complexity?
General Medium

Answer:

  1. Map the complexity: Inventory prompts, rules, and special cases, so you know what exists.

  2. Identify dead weight: Find rules and cases that no longer matter, so removal targets are clear.

  3. Establish a behavior baseline: Capture current behavior, so simplification can preserve it.

  4. Simplify incrementally: Remove complexity in small verified steps, so risk stays low.

  5. Regression-test each step: Verify behavior holds after each removal, so simplification doesn't break things.

  6. Document what remains: Record why each retained piece exists, so complexity doesn't re-accumulate blindly.

Your agent needs to work reliably, but its behavior depends on assumptions about input volume that break during unexpected spikes.
How would you design the system to stay reliable when input volume defies assumptions?
General Medium

Answer:

  1. Avoid hard volume assumptions: Design for variable load, so spikes don't break logic.

  2. Bound resource use: Cap what any volume can consume, so spikes don't exhaust resources.

  3. Scale or shed: Add capacity or drop excess under load, so volume is handled gracefully.

  4. Buffer with queues: Absorb spikes, so downstream isn't overwhelmed.

  5. Monitor against assumptions: Alert when volume exceeds expectations, so you react before breakage.

Your agent works, but its answers degrade when the same fact appears differently across sources and it can't tell they're the same.
How would you design the system to recognize the same entity across varied representations?
General Medium

Answer:

  1. Normalize entities: Standardize names and identifiers, so variants map to one entity.

  2. Resolve entities: Match different representations to the same underlying thing, so duplicates are recognized.

  3. Use identifiers over names: Anchor to stable IDs where possible, so surface variation doesn't confuse.

  4. Reconcile attributes: Merge facts about the same entity from different sources, so information is unified.

  5. Handle ambiguity: Distinguish genuinely different entities with similar names, so resolution doesn't over-merge.

Your agent needs to handle a long task, but the user wants to check progress and change direction partway through.
How would you design the system to support progress visibility and mid-task steering?
General Medium

Answer:

  1. Expose progress: Show what stage the task is at, so users can check in.

  2. Support interruption: Allow users to pause or redirect mid-task, so steering is possible.

  3. Preserve work on change: Keep completed parts when direction shifts, so steering isn't wasteful.

  4. Re-plan on new direction: Adapt the remaining work to the change, so it aligns with new intent.

  5. Confirm significant changes: Verify redirections, so you don't misread a check-in as a pivot.

Your agent works, but it occasionally produces an answer that's harmful only in a specific cultural context it doesn't recognize.
How would you design the system to handle culturally context-dependent appropriateness?
General Medium

Answer:

  1. Recognize cultural context: Detect the user's cultural setting, so appropriateness can adapt.

  2. Adapt content accordingly: Adjust examples, references, and framing, so output fits the context.

  3. Avoid culturally insensitive defaults: Don't assume one culture's norms, so output doesn't offend elsewhere.

  4. Test across cultures: Evaluate appropriateness in multiple contexts, so blind spots surface.

  5. Enable local feedback: Let users flag cultural issues, so real cases inform improvement.

Your agent needs to handle a request that spans a boundary where data sensitivity changes, and it applies uniform handling.
How would you design the system to adapt handling as data sensitivity changes?
General Medium

Answer:

  1. Classify data sensitivity: Tag data by sensitivity level, so handling can adapt.

  2. Apply level-appropriate controls: Use stricter handling for sensitive data, so protection matches risk.

  3. Enforce at boundaries: Change handling as data crosses sensitivity lines, so uniform treatment doesn't under-protect.

  4. Restrict sensitive data flow: Limit where high-sensitivity data goes, so exposure is contained.

  5. Audit sensitive handling: Log how sensitive data was processed, so compliance is verifiable.

Your agent works, but when it delegates to a sub-agent, it loses visibility into what the sub-agent actually did.
How would you design the system to maintain visibility across delegation?
General Medium

Answer:

  1. Propagate tracing: Pass correlation IDs into sub-agents, so their work is traceable.

  2. Log sub-agent actions: Capture what each sub-agent did, so nothing is a black box.

  3. Return structured results: Have sub-agents report outcomes clearly, so the parent understands what happened.

  4. Surface sub-agent reasoning: Make delegated reasoning inspectable, so failures are diagnosable.

  5. Aggregate observability: Roll up sub-agent telemetry to the parent, so the full picture is visible.

Your agent needs to operate where every LLM call must be justified for cost, but you can't tell which calls actually contribute to good answers.
How would you design the system to measure each call's contribution to quality?
General Medium

Answer:

  1. Attribute quality to calls: Trace which calls influenced the final answer, so contribution is visible.

  2. Ablate calls: Remove calls and measure quality impact, so you find which matter.

  3. Track cost per call: Pair each call's cost with its contribution, so value is assessable.

  4. Eliminate low-value calls: Cut calls that don't improve answers, so spend is justified.

  5. Monitor call efficiency: Measure quality-per-call over time, so waste surfaces.

Your agent works, but its retrieval treats a user's typo-ridden query the same as a clean one and fails to find matches.
How would you design the system to handle noisy, error-prone queries?
General Medium

Answer:

  1. Correct obvious errors: Fix typos and misspellings before retrieval, so noise doesn't block matches.

  2. Use fuzzy matching: Tolerate minor variations, so imperfect queries still match.

  3. Rewrite the query: Normalize noisy input into a cleaner form, so retrieval works from clarity.

  4. Rely on semantic search: Use embeddings robust to surface noise, so meaning matches despite errors.

  5. Confirm on ambiguity: Clarify when a noisy query is unclear, so you don't retrieve on a wrong guess.

Your agent needs to handle a request that could be satisfied cheaply if it's simple or requires deep work if complex, but it commits to one path immediately.
How would you design the system to defer path commitment until complexity is known?
General Medium

Answer:

  1. Assess before committing: Gauge complexity first, so you choose the right path.

  2. Start cheap, escalate as needed: Try the simple path and upgrade if it's insufficient, so you don't over-invest upfront.

  3. Detect insufficiency early: Recognize when the cheap path won't work, so you escalate promptly.

  4. Preserve work on escalation: Reuse what the cheap path produced, so escalation isn't wasteful.

  5. Monitor path decisions: Track how often escalation happens, so the classifier can be tuned.

Your agent works, but you're preparing for an audit and realize you can't prove it behaved correctly on any specific past request.
How would you design the system to prove correct past behavior for audit?
General Medium

Answer:

  1. Log complete request records: Capture inputs, context, reasoning, and outputs, so behavior is reconstructable.

  2. Version all components: Pin the model, prompt, and config per request, so you know exactly what ran.

  3. Store immutably: Keep tamper-proof records, so audit evidence is trustworthy.

  4. Make records retrievable: Enable looking up any past request, so audits are practical.

  5. Preserve for the required period: Retain records per audit requirements, so evidence survives long enough.