Design a tool schema strategy for a growing AI platform.

Instruction: Define a narrow tool contract with input validation, semantic checks, and versioned output behavior. v1 request is {"order_id":"O1","amount_cents":1250,"currency":"USD"}. Proposed v2 is {"order_id":"O1","amount":"12.50","currency":"USD"}, where amount is a decimal string in major units. O1 has only $10 refundable. Specify adapter behavior and business result.

Context: Choose how a platform should describe and evolve tool inputs and outputs as teams add more integrations.

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I would organize tools around user actions, with one clearly described purpose per operation. For a refund tool, I would define required fields, currency representation, amount limits, and a result that distinguishes completed, rejected, and pending refunds. The backend also checks the order's refundable balance and the caller's permission.

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Your preparation path

Work through these questions in order. Read the answer aloud, then explain it in your own words.

1. Start with the foundations

Build the vocabulary and explain the core decisions.

  1. When should a model call a tool instead of answering from context? Free sample
  2. How would you explain MCP to a product engineer in one minute? Free sample
  3. What information should the orchestrator validate before executing a tool call? Free sample

2. Apply it to a real workflow

Practice diagnosis, validation, and everyday tradeoffs.

  1. Why do idempotency and retries matter more with AI-driven tool use? Free sample
  2. How do you keep permission boundaries clear when many tools share overlapping capabilities? Member answer
  3. A user revokes access to a connected app mid-session. How should the AI workflow behave? Member answer

3. Prepare for senior discussions

Explain failure boundaries, recovery, and production choices.

  1. Design a fallback strategy when tools are unavailable, degraded, or unauthorized. Member answer
  2. How do you implement MCP step-up authorization without losing scopes or retrying forever? Member answer
  3. An MCP request resumes after user confirmation. How would you validate its requestState? Member answer

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