Clear
Your agent needs to handle a request that fails partway, and right now a partial failure leaves the system in an inconsistent state.
How would you design the system to maintain consistency through partial failures?
General Medium

Answer:

  1. Use transactions where possible: Make multi-step operations atomic, so partial failure doesn't leave inconsistency.

  2. Design compensating actions: Undo completed steps on failure, so state is rolled back.

  3. Make steps idempotent: Ensure retries are safe, so recovery doesn't compound the problem.

  4. Checkpoint before risky steps: Save state to restore to, so you can recover cleanly.

  5. Detect inconsistent state: Check for and repair inconsistency, so it doesn't persist.

Your agent works, but users in regulated industries won't adopt it because they can't verify it meets their specific control requirements.
How would you design the system to demonstrate compliance with specific controls?
General Medium

Answer:

  1. Map to control requirements: Align system capabilities with specific controls, so compliance is demonstrable.

  2. Provide audit evidence: Generate records proving controls are met, so verification is possible.

  3. Document controls: Maintain clear documentation of how each requirement is satisfied, so adopters can verify.

  4. Enable independent audit: Give auditors access to verify, so compliance isn't just claimed.

  5. Monitor control adherence: Track that controls stay in effect, so compliance is continuous.

Your agent needs to run reliably, but occasional transient bugs appear that you can never reproduce to fix.
How would you design the system to make transient bugs reproducible?
General Medium

Answer:

  1. Capture full state on failure: Log everything needed to reproduce, so transient bugs have a record.

  2. Record inputs and randomness: Store seeds and exact inputs, so runs can be replayed.

  3. Snapshot context: Save retrieved data and config at failure time, so conditions are reconstructable.

  4. Provide replay tooling: Enable re-running captured failures, so bugs can be investigated.

  5. Increase logging on rare paths: Add detail where transient bugs occur, so next time is diagnosable.

Your agent needs to give consistent answers, but its knowledge sources sometimes disagree with each other.
How would you design the system to handle disagreement between knowledge sources?
General Medium

Answer:

  1. Detect source conflicts: Identify when sources disagree, so it's not resolved silently.

  2. Rank source authority: Weight more reliable sources higher, so conflicts favor trustworthy data.

  3. Prefer recent data: Favor fresher information when sources conflict, so stale data doesn't win.

  4. Surface the disagreement: Tell users when sources differ, so they can judge.

  5. Cite competing sources: Attribute conflicting claims, so the disagreement is transparent.

Your agent needs to handle escalating workloads, but scaling up costs money you'd rather not spend if a cheaper optimization would do.
How would you design the process to choose between scaling and optimizing?
General Medium

Answer:

  1. Diagnose the bottleneck: Determine what's actually limiting you, so you address the real constraint.

  2. Estimate optimization headroom: Assess how much efficiency you can gain, so you know if it suffices.

  3. Compare cost of each: Weigh optimization effort against scaling spend, so you pick the cheaper path.

  4. Optimize first, then scale: Exhaust cheap efficiency gains before adding capacity, so you don't overspend.

  5. Scale when optimization runs out: Add capacity once efficiency is maxed, so growth isn't blocked.

Your agent needs to serve results that combine cached and live data, but the mix sometimes produces internally inconsistent answers.
How would you design the system to keep mixed cached-and-live data consistent?
General Medium

Answer:

  1. Track data provenance: Know which parts are cached versus live, so consistency can be reasoned about.

  2. Align freshness: Ensure combined data reflects the same point in time, so parts don't contradict.

  3. Refresh together: Update related cached and live data jointly, so they stay coherent.

  4. Detect inconsistency: Check combined results for contradictions, so problems are caught.

  5. Prefer live for critical fields: Use live data where consistency matters most, so key facts are current.

Your agent works, but under adversarial testing, carefully crafted inputs make it behave in ways you never intended.
How would you design the system to be robust against adversarial inputs?
General Medium

Answer:

  1. Red-team systematically: Probe with adversarial inputs proactively, so weaknesses are found before attackers do.

  2. Validate and sanitize inputs: Screen for malicious patterns, so crafted inputs are caught.

  3. Constrain behavior: Bound what the agent can do, so adversarial inputs can't push it far.

  4. Detect anomalies: Flag unusual input patterns, so attacks are noticed.

  5. Fail safely: Degrade securely under attack, so exploitation doesn't cause harm.

  6. Patch discovered weaknesses: Fix vulnerabilities as found, so robustness improves over time.

Your agent needs to handle requests that require it to remember commitments it made, but it forgets what it promised earlier.
How would you design the system to track and honor its own commitments?
General Medium

Answer:

  1. Record commitments: Log what the agent promised, so they're tracked.

  2. Reference them later: Check commitments when relevant, so they're honored.

  3. Follow through: Ensure promised actions actually happen, so commitments aren't empty.

  4. Flag conflicts: Detect when new actions contradict commitments, so consistency holds.

  5. Communicate commitment status: Tell users where promised work stands, so they can rely on it.

Your agent needs to work with a downstream model whose output format occasionally changes, breaking your parsing.
How would you design the system to parse model output resiliently?
General Medium

Answer:

  1. Parse defensively: Handle format variations gracefully, so minor changes don't break parsing.

  2. Use structured output modes: Enforce schemas where the model supports them, so format is guaranteed.

  3. Validate before using: Check parsed output is well-formed, so malformed data is caught.

  4. Retry on parse failure: Re-prompt with feedback when parsing fails, so recoverable errors resolve.

  5. Fall back gracefully: Handle unparseable output cleanly, so failures don't cascade.

Your agent is now a mature, business-critical system, but you have no principled way to decide what to improve, maintain, or retire next.
How would you design the process to prioritize the agent's ongoing evolution?
General Medium

Answer:

  1. Measure against goals: Track how well the system meets business objectives, so priorities tie to value.

  2. Analyze usage and failures: Understand what's used, what breaks, and what's missing, so decisions are data-driven.

  3. Weigh impact against effort: Rank changes by return, so you work on the highest-leverage items.

  4. Retire what's unused: Remove low-value features, so complexity stays justified.

  5. Balance new against maintenance: Allocate between features and reliability, so the system stays healthy while growing.

  6. Revisit priorities regularly: Reassess as the system and needs evolve, so evolution stays aligned.

Your agent works well, but its improvements have plateaued and you're not sure where the remaining quality is being lost.
How would you design the process to find the ceiling on quality and where it's lost?
General Medium

Answer:

  1. Analyze remaining failures: Categorize what still goes wrong, so the loss sources are identified.

  2. Establish the ceiling: Test with ideal conditions, so you know the achievable maximum.

  3. Attribute loss by stage: Measure where quality drops, so the biggest losses are found.

  4. Compare against best-case: Diff current performance from the ceiling, so the gap is quantified.

  5. Target the largest gaps: Focus effort where most quality is lost, so improvement resumes.

Your agent needs to handle a decision where acting too early and too late both cause harm, but it has no sense of timing.
How would you design the system to handle time-sensitive decision timing?
General Medium

Answer:

  1. Model the timing window: Define when action is appropriate, so the agent knows the right moment.

  2. Wait for sufficient signal: Avoid acting before enough information arrives, so early action is prevented.

  3. Set deadlines: Bound how long to wait, so late action is prevented.

  4. Monitor conditions: Watch for the trigger to act, so timing is responsive.

  5. Handle the edges: Manage what happens if the window is missed, so failures are graceful.

Your agent needs to serve a global audience, but its default assumptions reflect one region's norms and confuse users elsewhere.
How would you design the system to avoid embedding region-specific default assumptions?
General Medium

Answer:

  1. Identify hidden defaults: Surface assumptions about units, formats, and norms, so they're visible.

  2. Make defaults configurable: Let region determine defaults, so assumptions adapt.

  3. Detect user region: Infer or ask for locale, so the right defaults apply.

  4. Avoid hardcoding norms: Don't bake in one region's conventions, so behavior generalizes.

  5. Test across regions: Validate for multiple locales, so region-specific assumptions surface.

Your agent works, but its behavior in rare error conditions is untested because those conditions are hard to trigger.
How would you design the system to test rare error conditions reliably?
General Medium

Answer:

  1. Inject faults deliberately: Simulate error conditions on demand, so they can be tested.

  2. Mock failing dependencies: Force dependencies to fail in tests, so error handling is exercised.

  3. Use chaos testing: Randomly introduce failures, so untested paths are triggered.

  4. Replay past incidents: Recreate real error conditions from history, so known cases are covered.

  5. Assert on error behavior: Verify graceful handling under each condition, so error paths are validated.

Your agent needs to work with data that arrives in batches, but sometimes a batch is incomplete and it processes it as if it were whole.
How would you design the system to handle incomplete batch data?
General Medium

Answer:

  1. Validate batch completeness: Check a batch is whole before processing, so incomplete ones are caught.

  2. Detect missing records: Identify gaps against expected counts, so incompleteness surfaces.

  3. Wait or flag: Hold for completion or mark as partial, so you don't treat incomplete as whole.

  4. Process what's valid: Handle complete portions where safe, so partial data still provides value.

  5. Communicate incompleteness: Signal when results are based on partial data, so users judge accordingly.

Your agent's reasoning is sound, but it presents conclusions without the intermediate steps, so users in a technical domain can't verify them.
How would you design the system to make technical reasoning verifiable?
General Medium

Answer:

  1. Show intermediate steps: Surface the reasoning path, so users can follow and check it.

  2. Cite evidence per step: Ground each step in data, so claims are verifiable.

  3. Make assumptions explicit: State what the reasoning rests on, so users can validate premises.

  4. Enable drill-down: Let users inspect any step in detail, so verification is possible.

  5. Separate conclusion from working: Give the answer plus its derivation, so both quick use and verification are served.

Your agent needs to handle a task where the right answer depends on organizational policy that varies and changes over time.
How would you design the system to keep answers aligned with current organizational policy?
General Medium

Answer:

  1. Externalize policy: Store policy as config or retrievable content, so it's not baked into prompts.

  2. Retrieve current policy: Pull the latest policy at answer time, so answers reflect what's current.

  3. Version policy: Track policy changes, so you know which applied when.

  4. Update centrally: Change policy in one place, so all answers stay aligned.

  5. Validate against policy: Check answers comply with current policy, so violations are caught.

Your agent works, but you can't tell whether a quality problem affects all users or just a specific segment.
How would you design the system to detect segment-specific quality issues?
General Medium

Answer:

  1. Segment your metrics: Slice quality by user type, region, and use case, so segment issues surface.

  2. Compare across segments: Look for segments underperforming the average, so localized problems are found.

  3. Build segmented eval sets: Test each segment separately, so gaps are caught in testing.

  4. Alert on segment divergence: Flag when a segment degrades, so you notice before it spreads.

  5. Diagnose per segment: Investigate why a segment differs, so fixes are targeted.

Your agent needs to handle a request that requires information from a system that's slow but authoritative and one that's fast but sometimes stale.
How would you design the system to balance authoritative-but-slow against fast-but-stale sources?
General Medium

Answer:

  1. Match source to need: Use the fast source for tolerant cases and the authoritative one where accuracy is critical, so each fits.

  2. Serve fast, verify async: Return the fast answer, then confirm against the authoritative source, so you get speed with a correctness check.

  3. Cache the authoritative source: Store its results to serve fast, so you avoid the slow path on repeats.

  4. Escalate on stakes: Use the authoritative source when being wrong is costly, so risk drives the choice.

  5. Communicate the trade-off: Signal when an answer is fast-but-provisional, so users know its reliability.

Your agent needs to operate in an environment where requirements change frequently, but each change requires rebuilding and redeploying it.
How would you design the system to adapt to changing requirements without redeployment?
General Medium

Answer:

  1. Externalize behavior: Store prompts, rules, and config outside code, so changes don't need redeploys.

  2. Make it data-driven: Drive behavior from configuration, so requirements change by editing data.

  3. Hot-reload changes: Apply updates without restart, so changes take effect immediately.

  4. Validate before applying: Check changes are safe, so live updates don't break things.

  5. Enable instant rollback: Revert changes without redeployment, so mistakes are quickly undone.