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Your agent's behavior is correct, but it's so unpredictable in its phrasing that users can't build reliable workflows around its output.
How would you design the system to make output predictable enough to build on?
General Medium

Answer:

  1. Standardize output structure: Enforce a consistent format, so downstream workflows can rely on it.

  2. Constrain phrasing where it matters: Fix key elements, so critical parts don't vary.

  3. Separate stable from variable: Keep structural parts fixed and let only content vary, so workflows have anchors.

  4. Document the contract: Specify what output users can depend on, so they build on stable parts.

  5. Version output format: Track format changes, so workflows aren't broken unexpectedly.

Your agent needs to make decisions transparent, but exposing its full reasoning also exposes sensitive internal logic you don't want users to see.
How would you design the system to balance transparency with protecting internal logic?
General Medium

Answer:

  1. Separate user-facing from internal reasoning: Expose the justification, not the mechanism, so users understand without seeing internals.

  2. Explain at the right level: Give reasoning users need without revealing proprietary logic, so transparency serves them.

  3. Redact sensitive detail: Strip internal specifics from explanations, so they're safe to share.

  4. Log full detail internally: Keep complete reasoning private for audit, so nothing is lost.

  5. Provide evidence, not mechanism: Show what supports the answer, so users can trust without seeing how.

Your agent needs to handle a spike of near-identical requests during an incident, but it processes each one from scratch.
How would you design the system to handle correlated request spikes efficiently?
General Medium

Answer:

  1. Deduplicate concurrent requests: Collapse identical in-flight requests into one, so you compute once.

  2. Cache aggressively during spikes: Serve the shared answer from cache, so repeats are cheap.

  3. Detect correlation: Recognize when many requests are the same, so you handle them collectively.

  4. Coalesce processing: Batch identical work, so the spike is handled once, not many times.

  5. Broadcast the result: Share one computed answer across all matching requests, so effort is minimized.

Your agent works, but its dependencies have dependencies, and a failure three layers deep is nearly impossible to diagnose.
How would you design the system to diagnose failures in deep dependency chains?
General Medium

Answer:

  1. Trace through all layers: Propagate correlation IDs across every dependency, so the full chain is followable.

  2. Surface root causes: Bubble up the originating error, so you see the real cause, not just the symptom.

  3. Log at each layer: Capture context at every level, so the failure path is reconstructable.

  4. Map dependencies: Maintain a picture of the dependency graph, so you know what depends on what.

  5. Isolate with health checks: Test each layer independently, so you locate the failing one.

Your agent needs to serve a use case where being slightly wrong is worse than saying nothing, but it always prefers to answer.
How would you design the system to prefer abstention over risky answers?
General Medium

Answer:

  1. Set a high confidence bar: Require strong confidence to answer, so risky guesses are withheld.

  2. Default to abstention: Prefer "I don't know" when uncertain, so being wrong is avoided.

  3. Ground answers strictly: Answer only from solid evidence, so unsupported answers aren't given.

  4. Weight error cost: Factor the high cost of being wrong into the decision, so caution wins.

  5. Escalate instead of guessing: Route uncertain cases to humans, so hard questions still get addressed.

Your agent occasionally produces harmful output not because of the request but because of a rare interaction between otherwise-safe components.
How would you design the system to catch emergent harm from component interactions?
General Medium

Answer:

  1. Test end to end: Evaluate the full system, not just components, so emergent issues surface.

  2. Check outputs holistically: Apply safety checks to final output regardless of source, so interaction-caused harm is caught.

  3. Red-team the whole system: Probe for harm from component combinations, so emergent risks are found.

  4. Monitor real outputs: Watch production for unexpected harm, so rare interactions surface.

  5. Trace harmful outputs to source: Diagnose which interaction caused it, so it can be fixed.

Your agent needs to work with content in multiple formats — markdown, HTML, plain text — but its output formatting assumes one.
How would you design the system to produce format-appropriate output per destination?
General Medium

Answer:

  1. Detect the destination format: Know where output is going, so you format for it.

  2. Separate content from format: Generate content, then render to the target format, so one logic serves many outputs.

  3. Validate per format: Check output is valid for its destination, so rendering doesn't break.

  4. Handle format-specific rules: Respect each format's constraints, so output is correct everywhere.

  5. Test each format path: Verify output in every target format, so format bugs surface.

Your agent's answers are good, but it always uses the same reasoning approach even when a different one would fit the problem better.
How would you design the system to select the right reasoning strategy per problem?
General Medium

Answer:

  1. Classify the problem type: Identify what kind of reasoning it needs, so you match a strategy.

  2. Match strategy to problem: Use step-by-step for logic, decomposition for complex tasks, retrieval for facts, so the approach fits.

  3. Try alternatives on failure: Switch strategies when one doesn't work, so you're not stuck with a bad fit.

  4. Reserve expensive strategies: Use costly reasoning only when needed, so simple problems stay cheap.

  5. Measure strategy effectiveness: Track which works for which problems, so selection improves.

Your agent needs to handle requests that require external approval, but waiting for approval blocks everything behind it.
How would you design the system to handle approval waits without blocking?
General Medium

Answer:

  1. Process asynchronously: Suspend the awaiting task without holding resources, so other work proceeds.

  2. Persist pending state: Save the task while it waits, so it resumes cleanly on approval.

  3. Continue independent work: Advance parts that don't need approval, so progress isn't fully blocked.

  4. Handle approval timeouts: Manage requests that never get approved, so tasks don't hang forever.

  5. Resume on decision: Continue automatically when approval arrives, so no manual restart is needed.

Your agent works well, but every time you improve one metric, another quietly gets worse, and you only notice later.
How would you design the system to catch metric trade-offs during optimization?
General Medium

Answer:

  1. Track a metric suite: Monitor multiple metrics together, so improving one doesn't hide harming another.

  2. Set guardrail metrics: Define floors that must not regress, so trade-offs are caught immediately.

  3. Evaluate holistically: Judge changes on all metrics at once, so hidden regressions surface.

  4. Block harmful trade-offs: Reject changes that improve one metric by breaking another, so balance holds.

  5. Review trade-offs explicitly: Surface what each change costs, so trade-offs are deliberate.

Your agent needs to make a recommendation, but the best choice depends on information only the user has, which it doesn't ask for.
How would you design the system to gather decision-critical information from users?
General Medium

Answer:

  1. Identify what's needed: Determine which missing information affects the decision, so you ask for the right things.

  2. Ask targeted questions: Request only decision-critical details, so you don't over-interrogate.

  3. Prioritize by impact: Ask about the highest-impact unknowns first, so you get the most value.

  4. Proceed with defaults when possible: Fill non-critical gaps with reasonable assumptions, so you don't block unnecessarily.

  5. State what the answer depends on: Show how missing info would change things, so users see why it matters.

Your agent needs to operate across a fleet of instances, but they drift out of sync and start behaving inconsistently.
How would you design the system to keep a fleet of instances consistent?
General Medium

Answer:

  1. Centralize configuration: Pull config from a single source, so instances share the same settings.

  2. Version deployments: Ensure all instances run the same version, so behavior is uniform.

  3. Sync shared state: Keep common state in a shared store, so instances don't diverge.

  4. Roll out atomically: Update all instances together, so partial updates don't cause drift.

  5. Detect drift: Monitor for behavioral inconsistency across instances, so drift surfaces.

Your agent's retrieval and reasoning are good, but it can't tell when a question has no valid answer and invents one.
How would you design the system to recognize unanswerable questions?
General Medium

Answer:

  1. Detect no-answer cases: Recognize when no valid answer exists, so the agent doesn't fabricate.

  2. Check retrieval sufficiency: Verify context actually supports an answer, so gaps are caught.

  3. Distinguish types of unanswerable: Separate missing-data from impossible questions, so each is handled right.

  4. State it plainly: Tell the user no answer is available, so they aren't misled.

  5. Explain why: Clarify what makes it unanswerable, so the response is helpful.

Your agent needs to work under a compliance regime that requires explaining any decision on demand, months after it was made.
How would you design the system for long-term decision explainability?
General Medium

Answer:

  1. Log decisions durably: Store full decision context long-term, so explanations survive months later.

  2. Version all components: Pin the model, prompt, and data per decision, so it can be reconstructed.

  3. Capture reasoning: Record why each decision was made, so the rationale is preserved.

  4. Make records retrievable: Enable looking up any past decision, so explanations are practical.

  5. Ensure records are immutable: Protect against tampering, so explanations are trustworthy.

Your agent needs to handle a request where the user's stated goal and their actual need differ, and it optimizes for the stated goal.
How would you design the system to serve actual need over literal request?
General Medium

Answer:

  1. Probe the underlying need: Understand why the user is asking, so you serve the real goal.

  2. Recognize XY problems: Detect when the stated request masks a deeper need, so you address the right thing.

  3. Suggest better approaches: Offer solutions to the actual need, so users aren't locked into a suboptimal ask.

  4. Confirm the reframing: Verify your understanding of their real goal, so you don't overreach.

  5. Still answer the literal ask: Address what they asked too, so you don't ignore their explicit request.

Your agent needs to serve results that stay valid for a while, but it recomputes everything on every request, wasting resources.
How would you design the system to reuse valid results efficiently?
General Medium

Answer:

  1. Cache with validity windows: Store results with a lifespan, so they're reused while valid.

  2. Determine validity duration: Set how long each result stays good, so reuse is safe.

  3. Invalidate on change: Clear results when underlying data changes, so stale ones aren't served.

  4. Serve from cache first: Check cache before recomputing, so valid results are reused.

  5. Refresh proactively: Recompute before expiry for hot results, so users don't hit cold misses.

Your agent works, but you have no way to safely test changes against real production scenarios without risking real users.
How would you design the system to test against production scenarios safely?
General Medium

Answer:

  1. Shadow production traffic: Run changes on real requests without affecting users, so testing is realistic and safe.

  2. Replay historical requests: Test against recorded production cases, so you cover real scenarios.

  3. Use a staging mirror: Replicate production conditions in a safe environment, so tests are representative.

  4. Sandbox side effects: Prevent test runs from causing real actions, so testing is harmless.

  5. Compare against production: Diff test behavior against live, so regressions are visible.

Your agent needs to support undo, but some of its actions have already propagated to external systems that can't be reversed.
How would you design the system to handle undo across partially irreversible actions?
General Medium

Answer:

  1. Classify reversibility: Know which actions can be undone, so you handle each appropriately.

  2. Compensate the irreversible: Provide corrective actions where true undo isn't possible, so effects can still be mitigated.

  3. Confirm before irreversible steps: Gate permanent actions, so undo isn't needed for them.

  4. Undo reversible parts: Roll back what can be, so partial recovery is achieved.

  5. Communicate limits: Tell users what can't be undone, so expectations are honest.

Your agent needs to reason over structured data like tables, but it treats them as unstructured text and misreads rows and columns.
How would you design the system to reason over tabular data reliably?
General Medium

Answer:

  1. Preserve table structure: Keep rows and columns explicit in representation, so relationships aren't lost.

  2. Query rather than read: Route tabular questions to SQL or code, so the model doesn't misparse cells.

  3. Provide schema context: Give column meanings and types, so the model interprets correctly.

  4. Validate results: Check computed answers against the data, so misreads are caught.

  5. Handle large tables: Retrieve relevant rows rather than dumping everything, so scale doesn't break reasoning.

Your agent works, but as you add safety checks, latency and cost creep up until the checks cost more than the actual work.
How would you design the system to keep safety checks efficient?
General Medium

Answer:

  1. Right-size checks to risk: Apply heavy checks only to risky requests, so low-risk ones stay fast.

  2. Run checks in parallel: Execute safety checks concurrently with or alongside work, so they don't serialize latency.

  3. Use cheap checks first: Filter with fast checks before expensive ones, so most cases resolve cheaply.

  4. Cache check results: Reuse checks for repeated content, so you don't re-verify identical inputs.

  5. Measure check cost: Track what safety adds, so it stays proportionate to the work.