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Your agent's answers vary based on subtle differences in retrieved context, making its behavior hard to predict and test.
How would you design the system to make retrieval-driven behavior more predictable?
General Medium

Answer:

  1. Stabilize retrieval: Make retrieval deterministic where possible, so the same query returns consistent context.

  2. Rerank consistently: Apply stable ordering, so context presentation doesn't shift arbitrarily.

  3. Snapshot context for testing: Fix retrieved context in tests, so behavior is reproducible.

  4. Reduce sensitivity: Design generation robust to minor context variation, so small differences don't swing output.

  5. Test with varied context: Evaluate across retrieval variations, so unpredictability is measured.

Your agent needs to operate when downstream systems it depends on are temporarily unavailable, but right now it just fails.
How would you design the system to degrade gracefully when dependencies are down?
General Medium

Answer:

  1. Detect dependency failure: Recognize when a downstream system is down, so you can respond.

  2. Serve from cache: Use cached data when live sources are unavailable, so you still function.

  3. Offer reduced functionality: Provide what you can without the dependency, so users get partial value.

  4. Queue for later: Defer work needing the dependency, so it completes when service returns.

  5. Communicate clearly: Tell users what's temporarily unavailable, so expectations are set.

Your agent works well, but you can't demonstrate to skeptical stakeholders that it's actually better than the manual process it replaces.
How would you design the process to prove the agent's value against a baseline?
General Medium

Answer:

  1. Define comparable metrics: Measure the same outcomes for agent and manual process, so comparison is fair.

  2. Run a controlled comparison: Test both on identical workloads, so differences are attributable to the agent.

  3. Measure end outcomes: Compare task success, speed, and cost, so value is quantified concretely.

  4. Include quality, not just speed: Show the agent maintains or improves quality, so speed isn't the only story.

  5. Present clear evidence: Report results against the baseline, so skeptics see hard numbers.

Your agent needs to handle a workflow where different steps require different models, but switching between them adds latency and complexity.
How would you design the system to orchestrate multiple models efficiently?
General Medium

Answer:

  1. Route per step: Assign the right model to each step, so each gets appropriate capability.

  2. Minimize switching cost: Batch same-model steps together, so you reduce back-and-forth.

  3. Parallelize where possible: Run independent model calls concurrently, so switching doesn't serialize.

  4. Abstract behind an interface: Unify model access, so orchestration stays clean.

  5. Cache intermediate results: Reuse outputs across steps, so you avoid redundant model calls.

Your agent's outputs feed a dashboard, but occasional format inconsistencies break the rendering and show garbled data to executives.
How would you design the system to guarantee output consistency for downstream rendering?
General Medium

Answer:

  1. Enforce strict schemas: Validate every output against the expected format, so inconsistencies are caught.

  2. Normalize output: Standardize format after generation, so minor variations are corrected.

  3. Reject invalid output: Block malformed responses from reaching the dashboard, so rendering never breaks.

  4. Provide safe defaults: Render a fallback when data is missing, so gaps degrade gracefully.

  5. Test rendering: Validate outputs render correctly, so format bugs surface before executives see them.

Your agent needs to handle requests that require calling back multiple times as new information arrives, but it treats each callback as unrelated.
How would you design the system to handle stateful, multi-callback interactions?
General Medium

Answer:

  1. Maintain interaction state: Track the ongoing exchange across callbacks, so they're connected.

  2. Correlate callbacks: Link related callbacks to the same interaction, so context carries.

  3. Update state incrementally: Integrate each new callback's information, so understanding builds.

  4. Persist across callbacks: Store state durably, so gaps between callbacks don't lose context.

  5. Resolve when complete: Recognize when enough information has arrived, so the interaction concludes.

Your agent produces good output, but it's so slow to generate that by the time it finishes, the user's context has moved on.
How would you design the system to keep responses timely relative to user context?
General Medium

Answer:

  1. Stream output: Deliver incrementally, so users engage before generation completes.

  2. Prioritize responsiveness: Optimize for time-to-first-token, so users see something fast.

  3. Match speed to context: Use faster paths for time-sensitive moments, so responses stay relevant.

  4. Return early when possible: Give the answer as soon as it's ready, so you don't wait on extras.

  5. Cache to accelerate: Serve common responses instantly, so timing isn't a bottleneck.

Your agent needs to gracefully handle being wrong when a user corrects it, but it either stubbornly repeats itself or over-apologizes and abandons correct answers.
How would you design the system to handle user corrections well?
General Medium

Answer:

  1. Evaluate the correction: Assess whether the user is actually right, so you don't cave on correct answers.

  2. Update when genuinely wrong: Revise your answer when the correction is valid, so you don't stubbornly repeat errors.

  3. Hold firm when right: Explain your reasoning when the user is mistaken, so correct answers aren't abandoned.

  4. Stay respectful: Acknowledge corrections without excessive apology, so the tone stays steady.

  5. Learn from patterns: Track recurring corrections, so systematic errors get fixed.

Your agent needs to work with users in very different time zones and regions, but scheduled tasks and time-based logic assume one timezone.
How would you design the system to handle time and timezones correctly?
General Medium

Answer:

  1. Store in UTC: Keep all timestamps in a single canonical timezone, so there's no ambiguity internally.

  2. Convert at the edges: Display and accept times in the user's local zone, so users see what makes sense to them.

  3. Track user timezone: Store each user's zone, so time-based logic uses the right one.

  4. Handle DST correctly: Account for daylight saving shifts, so scheduled tasks don't drift.

  5. Test across zones: Validate time logic for multiple regions, so edge cases surface.

Your agent is being adopted faster than expected, and you realize its architecture has hard limits you'll hit within months.
How would you design the process to identify and address scaling limits before hitting them?
General Medium

Answer:

  1. Identify bottlenecks early: Map which components have hard limits, so you know what will break first.

  2. Model growth against limits: Project usage toward capacity ceilings, so you know when you'll hit them.

  3. Load-test to the ceiling: Find real limits before production does, so surprises are avoided.

  4. Plan capacity ahead: Address limits before they're reached, so growth isn't blocked.

  5. Design for horizontal scale: Remove hard ceilings where possible, so growth has room.

  6. Monitor headroom: Track how close you are to limits, so you act before hitting them.

Your agent's answers depend on external tools, but when a tool returns slightly outdated data, the agent presents it as current.
How would you design the system to handle data freshness from tools honestly?
General Medium

Answer:

  1. Capture data timestamps: Record when tool data was current, so freshness is known.

  2. Communicate data age: Tell users how recent the information is, so they don't assume it's live.

  3. Refresh stale data: Re-fetch when freshness matters, so critical answers use current data.

  4. Set freshness requirements: Define acceptable staleness per use case, so outdated data is rejected when it matters.

  5. Flag uncertainty: Note when data may have changed, so users judge reliability.

Your agent works in a setting where the cost of a wrong answer varies enormously by question, but it spends the same effort on all of them.
How would you design the system to allocate effort by the cost of being wrong?
General Medium

Answer:

  1. Assess error cost: Estimate the consequence of a wrong answer per request, so effort can match stakes.

  2. Invest more in high-stakes cases: Add verification and stronger models where errors are costly, so risk is reduced where it counts.

  3. Move fast on low-stakes cases: Handle cheap-to-be-wrong questions lightly, so resources aren't wasted.

  4. Escalate risky answers: Route high-cost cases to review, so the worst errors get caught.

  5. Calibrate the tradeoff: Tune effort against error cost, so allocation stays optimal.

Your agent needs to handle a user changing their mind mid-task, but it plows ahead with the original request.
How would you design the system to handle mid-task changes of intent?
General Medium

Answer:

  1. Detect intent shifts: Recognize when the user changes direction, so the agent adapts.

  2. Reassess the plan: Revise the task when intent changes, so work aligns with the new goal.

  3. Preserve useful progress: Keep still-relevant work, so a change doesn't waste everything.

  4. Confirm the change: Verify the new intent, so you don't misread a clarification as a pivot.

  5. Abandon obsolete work: Stop steps no longer needed, so effort isn't wasted on the old goal.

Your agent's performance is fine, but its dependencies — vector DB, model API, tools — each have separate monitoring, so diagnosing an issue means checking five dashboards.
How would you design unified observability across all dependencies?
General Medium

Answer:

  1. Centralize telemetry: Aggregate metrics and logs in one place, so you don't chase five dashboards.

  2. Correlate across systems: Link related events with shared IDs, so a request's full path is visible.

  3. Build a unified view: Provide a single dashboard spanning dependencies, so system health is seen at a glance.

  4. Alert holistically: Trigger on cross-system conditions, so issues spanning components are caught.

  5. Trace end to end: Follow requests through every dependency, so the failing component is quickly found.

Your agent needs to work with data that has strict access levels, but it sometimes surfaces information in summaries that the user isn't cleared to see.
How would you design the system to enforce access control through summarization and reasoning?
General Medium

Answer:

  1. Filter before retrieval: Restrict the agent to data the user can access, so restricted content never enters context.

  2. Enforce at the source: Apply access control at the data layer, so filtering isn't left to the model.

  3. Check outputs against clearance: Verify summaries contain only permitted information, so leaks are caught.

  4. Avoid inference leaks: Prevent restricted facts from being derivable, so access control isn't bypassed indirectly.

  5. Audit access: Log what data informed each answer, so violations are traceable.

Your agent produces answers that are individually good, but across a session it keeps contradicting its own earlier recommendations.
How would you design the system to maintain consistent recommendations across a session?
General Medium

Answer:

  1. Track prior recommendations: Record what the agent advised, so it can stay consistent.

  2. Reference past advice: Check new recommendations against earlier ones, so contradictions are caught.

  3. Ground in stable criteria: Base recommendations on consistent logic, so they don't swing arbitrarily.

  4. Explain changes: When advice genuinely shifts, say why, so it reads as reasoning, not inconsistency.

  5. Monitor coherence: Track contradictions across sessions, so drift surfaces.

Your agent works with an LLM that has a fixed rate limit, but demand is bursty, so you're either throttled during peaks or wasting capacity during lulls.
How would you design the system to smooth bursty demand against fixed capacity?
General Medium

Answer:

  1. Buffer with queues: Absorb bursts in a queue, so peaks drain against steady capacity.

  2. Shift deferrable work: Move non-urgent tasks to lulls, so capacity is used evenly.

  3. Prioritize during peaks: Serve urgent requests first when throttled, so critical work isn't delayed.

  4. Cache to cut peak load: Serve repeats from cache, so bursts hit fewer live calls.

  5. Scale where possible: Add temporary capacity for sustained peaks, so throttling is minimized.

Your agent occasionally needs human input mid-task, but pausing and resuming breaks its state and it starts over.
How would you design the system to pause for human input and resume cleanly?
General Medium

Answer:

  1. Persist state at pause: Save full context when waiting for input, so nothing is lost.

  2. Assign a resumable handle: Track the paused task, so it can be picked up later.

  3. Resume from checkpoint: Continue from where it stopped, so no work repeats.

  4. Handle timeouts: Manage inputs that never come, so paused tasks don't hang forever.

  5. Integrate the input cleanly: Merge human input into the ongoing task, so it continues seamlessly.

Your agent needs to prioritize which of many pending requests to handle first, but it processes them in arrival order regardless of urgency.
How would you design the system to prioritize requests intelligently?
General Medium

Answer:

  1. Score by urgency and value: Rank requests on importance, so critical ones go first.

  2. Use priority queues: Serve high-priority work ahead of low, so ordering reflects need.

  3. Prevent starvation: Ensure low-priority requests eventually run, so they aren't perpetually deferred.

  4. Respect SLAs: Factor deadlines into priority, so time-sensitive work meets its targets.

  5. Rebalance dynamically: Adjust priorities as conditions change, so the queue stays responsive.

Your agent is now critical infrastructure, but your team's knowledge of how it works lives entirely in a few people's heads.
How would you design the system and process to reduce key-person dependency?
General Medium

Answer:

  1. Document thoroughly: Capture architecture, decisions, and rationale, so knowledge isn't only in heads.

  2. Encode behavior in tests: Maintain evals that specify expected behavior, so intent is preserved in code.

  3. Standardize patterns: Use consistent approaches, so anyone familiar with one part understands others.

  4. Distribute ownership: Spread responsibility across the team, so no single person is a bottleneck.

  5. Maintain runbooks: Document operations and incident response, so others can run the system.

  6. Cross-train: Rotate knowledge across engineers, so expertise is shared, not siloed.