Anthropic Updated CCAR-F Exam Questions and Answers by elora

Option A follows the MCP error contract. An error originating during execution of a valid tool call—such as an API failure, input-validation problem, or business-logic failure—should be returned inside the tool result with isError: true. The content should explain what happened and, where possible, provide actionable recovery guidance.

The official MCP tools specification distinguishes tool-execution errors from protocol-level errors and specifies that execution failures are reported through tool results using isError: true. Anthropic’s tool-using agent tutorial provides the equivalent Claude API pattern using is_error: true, allowing Claude to retry with corrected input, request clarification, or explain the limitation.

Option B falsely represents a failed operation as successful, weakening reliable failure detection. Option C deprives the agent of the information required to determine an appropriate recovery action. Option D may be converted into a tool error by some SDK runners, but uncaught exceptions are not the MCP-level response contract. The strongest implementation returns a concise, sanitized, actionable error result and separately records detailed diagnostics in server logs.

Option D separates durable case history from volatile operational data. The new session receives a compact, structured summary describing the billing dispute, the customer’s objective, actions previously taken, and the unresolved status. It does not inherit outdated backend observations as though they were still authoritative. Fresh tool calls then retrieve the current refund or order state before the agent responds.

Agent SDK sessions preserve conversation history, including earlier tool calls and tool results. Resuming the complete transcript therefore reintroduces stale system data into the active context, even though the external backend may have changed substantially during the four-hour gap. Conversation persistence must not be confused with persistence of external-system truth.

Option A performs unnecessary calls to every previously used tool, including tools unrelated to the returning customer’s current question. Option B relies on prompt compliance while retaining contradictory historical evidence in context. Option C manually removes tool results from an existing transcript and may damage the logical relationship between prior tool_use and tool_result blocks while still retaining a long, unstructured conversation.

A structured summary should preserve stable identifiers, previous actions, customer commitments, and unresolved issues. Time-sensitive fields such as refund status, delivery state, account balance, or expected resolution should always be refreshed through authoritative tools.

Official references/topics: Session persistence, stale tool-result management, context compaction, fresh-data retrieval.