CCAR-F Anthropic Claude Certified Architect – Foundations Free Practice Exam Questions (2026 Updated)

The correct objective is to construct an architectural map before consuming the full implementation. Identifying the base cache abstraction, its interface, and the classes that implement or invoke it gives the agent a dependency-guided path through the code. It can then inspect only the invalidation implementations and integration points relevant to the proposed trigger.

This approach protects the context window. Anthropic states that every file read occupies context and that model performance can deteriorate as the window fills. Its Claude Code guidance warns against unbounded investigation that reads large numbers of files and recommends narrowing the exploration or delegating it. ( https://code.claude.com/docs/en/best-practices )

Option A is too lexical: searching only for invalidate or expire can miss event-driven invalidation, overridden methods, cache-key mutation, and generic interface calls. Option B loads approximately 6,000 lines without first establishing relevance. Option C assumes that filename patterns and file size correlate with architectural importance; the largest files may contain incidental code while a small interface defines the entire design.

Option D follows control and type relationships rather than arbitrary file order. After reading the base class, the agent can search for subclasses, imports, construction sites, middleware hooks, and calls to the invalidation contract, progressively expanding only where evidence requires it.

Official references/topics: Context-Efficient Exploration; Dependency-Guided Reading; Architectural Interfaces; Narrowly Scoped Investigation.

Option B introduces an evaluator-and-refinement loop at the correct orchestration layer. The coordinator already owns the research plan and delegation decisions, so it should inspect the synthesis result against the required questions, identify coverage gaps, and issue focused follow-up assignments. Anthropic’s description of its multi-agent research system follows this pattern: the lead agent synthesizes returned findings, determines whether additional research is required, and creates new subagents or refines its strategy before producing the final result. Increasing the initial query breadth, option A, may generate additional irrelevant material and cannot guarantee that unforeseen gaps will be covered. Option C merely documents the incompleteness instead of correcting it. Option D weakens role separation by giving the synthesis agent search capabilities, increasing tool complexity and bypassing the coordinator’s centralized tracking. Targeted re-delegation preserves specialized responsibilities and creates an observable sequence of research, evaluation, refinement, and resynthesis. The coordinator should also maintain explicit coverage criteria and limit the number of refinement rounds so the system improves completeness without entering an uncontrolled research loop.

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Option C defines the reviewer’s actual objective instead of relying on an undefined notion of confidence. The prompt should identify reportable categories such as correctness defects, security vulnerabilities, data-loss risks, broken requirements, and meaningful performance regressions. It should also specify that cosmetic preferences, lint-enforced formatting, speculative refactoring, and intentional repository conventions must not be reported unless they cause concrete incorrect behavior.

Anthropic’s Claude Code best-practices guidance recommends telling a reviewer to report gaps affecting correctness or stated requirements and to treat other observations as optional. Without such criteria, a reviewer asked to “find issues” will predictably return technically defensible but operationally low-value observations. Option A adds cost and another probabilistic decision layer before correcting the primary prompt. Option B relies on self-reported confidence, which does not necessarily align with developer value or severity. Option D can suppress genuine defects that require inference or cross-file verification because “highly confident” is undefined. Explicit scope, evidence requirements, and examples of both reportable and excluded findings directly calibrate the review toward what developers will act upon. Claude Code best practices

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Option D improves the generation conditions instead of filtering defective output afterward. Anthropic recommends using CLAUDE.md for repository-wide standards and information that Claude should apply in every session. The file can define what constitutes a useful test, require assertions on observable behavior, identify approved fixture factories, prohibit duplication of existing scenarios, and provide contrasting examples of strong and trivial tests. These instructions are available before Claude decides what tests to create.

Option A may remove some weak tests, but it doubles model work and still permits the first stage to generate low-quality material. Option B treats line coverage as a quality measure even though a trivial assertion can execute new lines without validating behavior. Option C abandons difficult areas rather than improving generation. The standards should also direct Claude to inspect nearby tests and fixtures before writing new cases, identify the behavior or regression each test protects, and run the relevant suite afterward. Because CLAUDE.md consumes context in every session, the guidance should remain concise; lengthy testing procedures are better placed in a reusable skill referenced from the project instructions.

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In the standard Claude tool-use loop, the application executes lookup_order and sends its output back as a tool_result . That result becomes part of the conversation state available to Claude. Claude then evaluates the purchase date, refund policy, customer request, authorization constraints, and available tools before selecting the next action.

Anthropic describes client-tool orchestration as a repeated loop: Claude emits a tool_use request, the application executes it, returns a tool_result , and Claude continues reasoning from the updated conversation. Claude, rather than the tool implementation, selects when and how to invoke the next available tool unless the application has explicitly implemented a fixed workflow. ( https://platform.claude.com/docs/en/agents-and-tools/tool-use/how-tool-use-works )

Options B and C describe possible custom orchestration architectures, but neither is stated in the scenario. Option D is inconsistent with adaptive agent behavior because later actions depend on information that did not exist before lookup_order completed. A rigid sequence would not respond appropriately to different purchase dates, eligibility states, or order conditions.

The tool result should return high-signal fields such as purchase date, return-window status, refund eligibility, existing refund status, and stable order identifiers so Claude can make the subsequent decision accurately.

Official references/topics: Tool-result continuation, adaptive agent loops, model-directed tool selection, sequential dependency handling.

The primary risk is not implementation difficulty but incomplete requirements. Production caching introduces decisions involving invalidation, stale-data tolerance, cache keys, tenant boundaries, serialization, stampede prevention, failure behavior, observability, deployment topology, and consistency expectations. Implementing Redis with a five-minute TTL before resolving these questions can produce a technically functional but operationally unsafe design.

Anthropic recommends having Claude interview the user before beginning a larger feature when important requirements remain uncertain. The AskUserQuestion workflow is intended to surface technical implementation concerns, edge cases, trade-offs, and assumptions the user may not have considered. Anthropic further recommends converting the resulting answers into a self-contained specification with explicit scope and an end-to-end verification step. ( https://code.claude.com/docs/en/best-practices )

Option B provides useful codebase context but postpones requirement discovery. Option C creates avoidable rework by allowing architecture to emerge from production failures. Option D documents uncertainty but delegates unresolved design choices during implementation, when they may already constrain the code.

After the interview produces a caching specification, Claude can enter plan mode to inspect the endpoint and map those requirements onto the existing architecture before implementation.

Official references/topics: Requirements Interviewing; AskUserQuestion; Specification Development; Edge-Case and Trade-Off Discovery.

Option C converts an empirically validated source hierarchy into an explicit extraction rule. The downstream contract requires one battery_capacity value, and historical analysis establishes that the detailed specifications table is substantially more reliable than the summary section. Claude should therefore be instructed to inspect all occurrences, detect conflicts, and select the detailed-table value when the two locations disagree.

Anthropic’s prompting guidance emphasizes clear, direct instructions, relevant context, and explicit decision rules when order or completeness matters. Providing the reason for the precedence rule also helps the model generalize it to comparable specification conflicts. Option A preserves every value but transfers a known and repeatable decision into downstream systems, unnecessarily changing the schema. Option B rejects approximately 15% of otherwise processable documents even though a reliable precedence policy is available. Option D creates a costly manual-review queue for conflicts that can usually be resolved deterministically. The extraction system should still retain source quotations or locations in internal provenance metadata when auditability matters, but the output field should follow the established detailed-table precedence. Anthropic prompting best practices

Option D directly addresses cache entries expiring before later batch requests are processed. Anthropic’s batch-processing documentation specifically notes that Message Batches can take longer than five minutes and recommends the one-hour prompt-cache duration for batches containing shared context. The prompt-caching documentation confirms that the default TTL is five minutes and that " ttl " : " 1h " creates an extended entry.

Option A may improve cache locality, but it introduces the sequential-processing latency explicitly prohibited by the requirement. Option B seeds the cache initially, but the prewarmed entry still expires after five minutes unless the TTL is extended; it therefore does not solve misses among requests scheduled later. Option C places the breakpoint on request-specific content, defeating reuse of the stable 8,000-token prefix and attempting to cache scripts that are not byte-for-byte identical.

The system should retain the breakpoint at the end of the shared system content and apply the one-hour TTL there. Cache-usage fields should then be monitored to confirm that cache_read_input_tokens rises and later batch requests reuse the intended prefix.

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The error response must explicitly communicate both control semantics and user-facing meaning. Setting " retriable " : false tells the agent that repeating the same operation cannot change the outcome. Providing a customer-friendly explanation allows Claude to respond accurately without exposing internal implementation details or inventing its own interpretation of the business rule.

Anthropic recommends returning failed tool operations with an error indicator and sufficiently informative content so Claude can decide whether to retry, request another input, or explain the limitation. Tool interfaces should provide detailed descriptions and structured parameters rather than forcing Claude to infer operational behavior from ambiguous text. ( https://platform.claude.com/docs/en/agents-and-tools/tool-use/build-a-tool-using-agent?utm_source=chatgpt.com )

Option A appropriately limits automatic retries to technical failures, but it does not solve the stated customer-response problem unless business failures also carry clear semantics. Option B relies on fragile parsing of human-readable messages. Option C adds latency and another tool dependency, and eligibility may still change or fail for reasons not covered by the preliminary check.

A complete schema should identify the error code, category, retryability, customer-safe explanation, and permitted next actions. Technical errors can similarly return " retriable " : true with retry guidance and a maximum-attempt policy.

Official references/topics: Structured tool errors, retryability classification, customer-safe explanations, resilient MCP contracts.

Retry-with-error-feedback is effective when the required information is available and the defect concerns representation. Options A, C, and D are correctable formatting failures: the model can flatten an object into an array, remove thousands separators and emit an integer, or convert a datetime into the required date-only format. The validation message supplies enough information to revise the output.

Option B is fundamentally different. The complete co-author list is absent from the model’s input and exists only in an external document. No number of retries can recover evidence that was never supplied. Repeated attempts may instead increase the probability of fabrication. Anthropic’s hallucination guidance recommends restricting responses to available documents, allowing the model to acknowledge missing information, and withholding or retracting claims that cannot be grounded in the source. ( https://docs.anthropic.com/en/docs/test-and-evaluate/strengthen-guardrails/reduce-hallucinations )

The correct response is therefore to return an explicit missing-data state, retrieve the external document through a tool, or route the record for enrichment. Retrying without changing the information boundary cannot solve the problem.

Current Anthropic Structured Outputs can eliminate many shape-related failures by guaranteeing JSON Schema conformance, but they still cannot create unavailable source facts. ( https://platform.claude.com/docs/en/build-with-claude/structured-outputs ) This distinction—format failure versus evidence failure—is central to reliable extraction architecture.

Official references/topics: Retry Boundaries; Missing Context; Grounded Extraction; Structured Outputs; External Data Retrieval.

Option C respects the customer’s explicit request for human assistance. The agent should not attempt to retain the interaction, gather additional account information, or require the customer to repeat the request. Because the escalation decision has already been made by the customer, further autonomous investigation would create unnecessary delay and disregard clear human direction.

Anthropic’s trustworthy-agent framework emphasizes maintaining meaningful human control over agent autonomy. Anthropic’s customer-support implementation guidance also recommends defining interaction branches and measuring escalation efficiency as part of the system’s success criteria.

Option A deliberately delays escalation despite an unambiguous request. Option B performs unnecessary tool calls and may expose or retrieve account information that is not required before transferring the conversation. Option D similarly introduces another conversational barrier. Since the current exchange is short and contains no tool-generated evidence, passing the available conversation history gives the human agent the immediate context—the customer’s frustration, repeated unsuccessful attempts, and explicit transfer request—without pretending that account investigation has occurred.

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This change is narrow, localized, and already defined: add one conditional validation check to an existing function in a single file. A separate planning phase would introduce process overhead without resolving meaningful architectural uncertainty. Direct execution allows Claude to read the function, implement the condition, and run the relevant focused tests.

Anthropic explicitly states that plan mode adds overhead and should generally be skipped when the scope is clear and the fix is small. Planning is most valuable when the approach is uncertain, multiple files are affected, or the code is unfamiliar. Anthropic’s practical rule is that when the required diff can be described in one sentence, direct implementation is appropriate. ( https://code.claude.com/docs/en/best-practices )

Option B allocates unnecessary reasoning effort to straightforward validation logic. Options C and D exaggerate the complexity of a single-function change. Broader impact analysis would be justified only if the requirement altered reservation semantics, time-zone rules, persistence behavior, or public interfaces—none of which is stated.

The implementation should still include verification. Claude should add or update tests for a future date, the current date, and a past date, then run the narrowest relevant test command. Direct execution does not mean unverified execution.

Official references/topics: Direct Execution; Plan-Mode Selection; Small Scoped Changes; Focused Verification.

A schema-defined tool provides a structured interface between Claude and the application. The tool’s input_schema can declare required properties, nested work-experience and education objects, arrays of skills, and exact data types. Claude then supplies the extracted resume information as tool-call arguments, which the application can read directly from the tool_use response.

Anthropic’s tool documentation specifies that a custom tool definition includes a JSON Schema object describing its expected parameters. Current strict tool use can additionally enforce that generated tool arguments match the declared schema exactly. This removes the need to locate JSON inside free-form text or depend on post-generation repair. ( https://docs.anthropic.com/en/docs/agents-and-tools/tool-use/implement-tool-use )

Option A is fragile because regular expressions do not provide a robust parser for arbitrary nested JSON and cannot correct missing properties or incorrect types. Option B improves formatting behavior but remains probabilistic. Option C doubles latency and creates two opportunities for information loss: first during extraction and again during reformatting.

In a production design, fields that may genuinely be absent from a resume should be optional or nullable rather than forcing invented values. The tool schema should also use strict: true where supported. Among the available choices, D provides the strongest structural guarantee and the cleanest downstream integration.

Official references/topics: Tool Use Responses, Input Schemas, Strict Tool Use, Nested Structured Extraction.

Option B eliminates an unnecessary agent boundary. The coordinator already possesses the accumulated findings and can answer a straightforward follow-up without serializing more than 80,000 tokens into a fresh subagent context, waiting for another model execution, and receiving the result back. Anthropic’s multi-agent research engineering guidance emphasizes scaling effort to task complexity: simple fact-finding or lightweight processing should use substantially fewer agents and tool calls than complex research. It also reports that multi-agent systems consume far more tokens than ordinary interactions, making avoidable delegation expensive and slow. Option A adds an interactive retrieval protocol between agents and additional round trips. Option C spends compute proactively on summaries that users may never request and creates cache-invalidation problems whenever findings change. Option D could reduce repeated input cost where caching is applicable, but the subagent still receives and processes an unnecessarily large context and still incurs spawning latency. Delegation is valuable when an isolated context or specialized capability materially improves the result. For a direct summary already supported by the coordinator’s active context, local handling is the faster and simpler architecture.

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The root cause is an incomplete tool contract. Claude sees that process_refund requires an order_id , but the tool description does not explain the parameter’s trusted source or the prerequisite lookup sequence. Option A makes the dependency explicit and prohibits fabricated values.

Anthropic states that tool descriptions should explain what a tool does, when it should be used, how it behaves, and any important limitations. Its prompting guidance also states that dependent tool calls must be executed sequentially and that Claude must never use placeholders or guess missing tool parameters. ( https://platform.claude.com/docs/en/agents-and-tools/tool-use/define-tools )

Option B merely forces some tool use; it does not force the correct tool or prevent a fabricated identifier. Option C is an essential defense-in-depth control, but it detects the invalid ID after the model has already made the faulty call. It does not correct the selection logic that caused the fabrication. Option D works only when the customer actually provides an identifier and introduces an unnecessary preprocessing dependency.

The process_refund schema should describe order_id as a verified identifier returned by lookup_order , and the tool description should state that the tool is unavailable until the corresponding order has been retrieved and eligibility established.

Official references/topics: Tool descriptions, prerequisite tool calls, parameter provenance, sequential tool orchestration.

Option A uses the limited review capacity as a risk-ranking mechanism rather than spending it uniformly. JSON Schema validation can prove that an output has the expected types and structure, but it cannot detect a semantically misplaced value such as a duration stored as an ingredient quantity. Field-level confidence can identify the exact parts of a record that warrant inspection, provided those scores are calibrated against labeled examples rather than trusted at face value. The labeled validation set must mirror the production distribution and include edge cases; Anthropic’s evaluation guidance explicitly recommends task-specific evaluations, representative distributions, measurable criteria, and automated grading where possible. Calibration then converts raw confidence into an empirically tested estimate of error risk, allowing reviewers to inspect the lowest-confidence records or fields first. Option C, random sampling, is useful for unbiased quality measurement and discovering new failure modes, but it does not maximize error detection within a fixed 20 percent review budget. Options B and D target narrow proxies—layout anomalies and missing required values—while the observed errors pass structural validation and may occur in ordinary-looking documents. The operational design should combine calibrated risk-based review with a smaller random audit sample to detect drift and overconfidence.

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Resuming the existing subagent preserves the expensive investigative context: files already inspected, data-flow relationships, hypotheses, and intermediate conclusions. Anthropic documents that session history contains prompts, tool calls, tool results, and responses, allowing an interrupted investigation to continue with its prior analysis intact. ( https://code.claude.com/docs/en/agent-sdk/sessions ) Subagent transcripts also persist within their parent session and can be resumed after an interruption or restart. ( https://code.claude.com/docs/en/agent-sdk/subagents?utm_source=chatgpt.com )

The engineer must nevertheless disclose the renamed utility functions. Anthropic explicitly distinguishes conversation persistence from filesystem persistence: resuming restores what the agent previously knew, but it does not freeze or snapshot the repository. ( https://code.claude.com/docs/en/agent-sdk/sessions ) Without the update, the subagent may search for obsolete symbols, misinterpret broken references, or rely on stale file paths.

Option A loses the detailed transcript and replaces it with a necessarily compressed summary. Option B preserves context but conceals a material repository change. Option D duplicates a large transcript inside a new context, increasing token consumption without providing any advantage over native resume functionality.

The resumed prompt should name the renamed functions, identify the merge or affected files, and instruct the subagent to re-read only the changed areas before continuing its broader exploration.

Official references/topics: Session Resume; Persistent Subagent Transcripts; Repository Drift; Targeted Context Refresh.

Option C parallelizes independent work while retaining centralized orchestration. Each precedent can be analyzed without waiting for the previous precedent, so the coordinator can divide the 12 cases into balanced subsets and invoke several document-analysis subagents concurrently. It then receives their final outputs, records which precedents completed or failed, and aggregates the results before synthesis. Anthropic’s multi-agent research architecture uses an orchestrator-worker pattern in which the lead agent creates specialized subagents that operate in parallel and return findings for consolidation. Keeping spawning decisions at the coordinator also produces a clearer execution trace for monitoring and debugging. A generic asynchronous queue, option A, adds infrastructure but does not define how results remain associated with the correct research task. Options B and D create nested or recursive delegation, making execution paths, permissions, failures, and token consumption harder to observe. Anthropic also cautions that multi-agent systems consume substantially more tokens than ordinary interactions, so unbounded recursive decomposition is inefficient. Coordinator-controlled parallel fan-out followed by deterministic aggregation provides the latency improvement without sacrificing operational visibility.

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Claude Code’s --bare option is specifically designed for faster scripted execution. It skips automatic discovery of CLAUDE.md files, hooks, skills, plugins, MCP servers, and auto-memory while retaining essential built-in capabilities such as Bash, file reading, and file editing. Because --bare also prevents automatic loading of the root CLAUDE.md, the required standards must be added explicitly.

Option C accomplishes both objectives. --append-system-prompt-file ./CLAUDE.md loads the project standards into the current invocation while preserving Claude Code’s default coding-agent system prompt and tool-use guidance. According to the official Claude Code CLI reference , append flags add file contents to the default system prompt, whereas replacement flags discard that default guidance.

Option A could work functionally but duplicates the standards in every command and creates configuration drift. Option B replaces the complete default prompt, removing useful coding, safety, and tool-use instructions. Option D improves prompt-cache reuse across different machines, but it does not disable hooks, plugins, skills, MCP servers, or CLAUDE.md discovery and therefore does not directly address the measured initialization delay.

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