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Option D allows orchestration effort to scale with the actual request. A simple factual query may require only the web-search agent and a direct coordinator response, whereas a comparative investigation may require web research, document analysis, synthesis, and report generation. Anthropic’s Building Effective AI Agents describes the orchestrator-workers pattern as a central model dynamically identifying subtasks, delegating them, and combining the results. It is specifically appropriate when the required subtasks cannot be predicted reliably in advance. Anthropic’s multi-agent research architecture likewise emphasizes varying the number of agents and tool calls according to task complexity. Option A introduces an inflexible binary decision and still sends every non-factual request through the full pipeline. Option B requires labeled data, ongoing retraining, and reliable definitions of the “optimal” agent combination. Option C is easier to implement but will become brittle as new query types appear. A capable coordinator can examine the requested output, necessary evidence, source requirements, and analytical depth at runtime, then invoke only the specialists that materially contribute to the answer.

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Direct @ references provide Claude with the exact implementations it must imitate. Anthropic documents that referencing a file with @ includes the full file content in the conversation, and multiple files can be referenced in one message. This gives Claude immediate access to the real transaction boundaries, exception structures, audit fields, naming conventions, and helper APIs used by the project. ( https://code.claude.com/docs/en/common-workflows )

Option B is inappropriate because the task is explicitly one-off and the conventions are already documented elsewhere. CLAUDE.md is loaded into every session and should contain concise information that broadly applies to the project. Adding detailed implementation material for a single integration would consume context unnecessarily. Anthropic recommends moving occasional procedures to skills and keeping CLAUDE.md limited to persistent, widely applicable guidance. ( https://code.claude.com/docs/en/memory )

Option C loses precision because a natural-language summary may omit subtle but important code behavior. Option D asks Claude to rediscover files that have already been identified, increasing exploration time and context usage.

The most effective prompt should reference all three modules, identify which pattern each demonstrates, specify the new module’s required behavior, and request focused tests proving that the established conventions were followed.

Official references/topics: @ file references, rich prompt context, CLAUDE.md scope, pattern-based implementation.

Option B removes the identified startup work while deliberately restoring the one source of project context the reviews require. Anthropic documents that --bare skips automatic discovery of hooks, skills, plugins, MCP servers, auto memory, and CLAUDE.md files. It is specifically intended for CI and scripted execution where fast, reproducible startup behavior is more important than loading every locally configured extension.

Because bare mode also skips the root CLAUDE.md, the pipeline must supply that content explicitly. --append-system-prompt-file ./CLAUDE.md loads the standards while retaining Claude Code’s default coding-agent behavior and tool guidance. Option A replaces the default system prompt but does not, by itself, establish the same minimal startup path as --bare; replacement also discards valuable default coding instructions. Option C can work technically but duplicates repository policy inside every pipeline invocation and creates configuration drift. Option D improves prompt-cache reuse by relocating machine-specific prompt sections, but it does not eliminate discovery of hooks, MCP servers, plugins, skills, and nested instructions. Bare mode plus an explicitly appended standards file directly addresses both performance and policy requirements. Claude Code bare-mode documentation

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The --system-prompt flag replaces Claude Code’s complete default system prompt. Although this does not technically remove the available tools, it discards the default coding-agent guidance that tells Claude how to gather repository context, navigate code, use tools, and verify findings. The replacement prompt says only to analyze the supplied diff, so the observed diff-only behaviour is consistent with the configured instructions.

Option B preserves the standard Claude Code identity and tool guidance while adding the custom review criteria. The Claude Code CLI reference states that --append-system-prompt appends instructions to the default prompt, whereas --system-prompt replaces it. Anthropic specifically recommends appending when Claude should remain a coding assistant that follows additional per-invocation rules.

Option A is incorrect because print mode does not inherently disable Read, Glob, or Grep; --allowedTools restricts or pre-authorizes tools but does not restore overwritten behavioural guidance. Option C is incorrect because replacement system prompts remain compatible with tools, although the replacement must supply suitable tool instructions. Option D changes where the diff appears but does not restore Claude Code’s default code-navigation behaviour. Appending the review instructions directly addresses the configuration error.

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Option A establishes a clear destination without forcing the subagent to follow a brittle route. The prompt should define the research question, boundaries, expected deliverable, acceptable source types, recency requirements, coverage expectations, and verification criteria. The subagent can then broaden, narrow, reformulate, or follow emerging leads according to observed search results.

Anthropic’s research-agent guidance emphasizes giving each subagent an objective, output format, source guidance, and clear task boundaries. It also describes research as dynamic and path-dependent, requiring agents to adapt their strategy as new information emerges.

Option B removes too much structure and may cause duplicated work, incomplete coverage, or inconsistent output. Option C handles only one known failure condition and still restricts the agent to a predetermined procedure. Option D adds classification complexity and creates an artificial boundary between topic types that may change during investigation. Objective-based delegation retains accountability because results can be evaluated against explicit quality criteria, while preserving the agent’s ability to discover alternative terminology, unexpected sources, and useful adjacent evidence. This is controlled autonomy rather than either procedural micromanagement or unrestricted exploration.

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Option A corrects the missing tool contract that permits Claude to guess a required parameter. The process_refund description should state its prerequisite explicitly: invoke lookup_order, use only the exact order_id returned by that successful call, and ask for additional identifying information when lookup cannot resolve an order. An input example can demonstrate the correct two-tool sequence.

Anthropic’s tool-definition guidance identifies detailed descriptions as the most important factor in tool performance. Descriptions should explain when a tool should and should not be used, what every parameter means, and all important limitations. The tool-use overview confirms that Claude selects and populates tools based on the request and their descriptions.

Option B forces some tool call but does not tell Claude which tool must run first or where the identifier originates. Option C is an essential defence-in-depth control, but it detects the fabricated value after Claude has already made the incorrect decision. Option D works only when the customer supplies an identifier and does not cover “recent purchase.” Explicit prerequisite and provenance instructions directly prevent the model from inventing the required argument.

Option C matches the distinction between reasoning about delegation and executing it. Defining subagents makes their descriptions available for selection, but the coordinator must still invoke the SDK’s subagent-spawning tool. Current Claude Agent SDK documentation calls this the Agent tool; Task was its earlier name and remains relevant to older SDK configurations. Anthropic’s Subagents in the SDK documentation instructs developers to include Agent in allowedTools so subagent invocations are approved automatically. Without that permission, an invocation can fall through to a permission callback or be denied under a non-interactive permission mode. Option A is unlikely because the configured subagent descriptions already tell Claude when each agent should be selected, although explicit prompting can improve invocation reliability. Option B misstates context isolation: context must be included in the spawning prompt, but that issue occurs after an invocation is attempted and does not explain the absence of all subagent executions. Option D would normally produce truncation evidence or incomplete output rather than consistent verbal promises with no tool call. The configuration should therefore permit Agent, explicitly request delegation where necessary, and log subagent invocation events.

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The dependency must be enforced by orchestration rather than left to probabilistic tool selection. Anthropic documents that tool_choice: { " type " : " tool " , " name " : " ... " } forces Claude to invoke the specified tool. By contrast, auto allows Claude to decide whether and which tool to call, while any requires some tool but does not force a particular one. ( https://platform.claude.com/docs/en/agents-and-tools/tool-use/define-tools )

Option A therefore establishes a deterministic two-stage workflow. The first API turn forces extract_metadata , producing the DOI and other structured paper details. The application validates and stores that result. A subsequent turn then exposes or permits verify_doi and lookup_citations , passing the extracted DOI as explicit state. This design converts an implicit tool dependency into an application-controlled execution graph.

Option B is incorrect because array order is not a documented precedence mechanism and cannot guarantee selection. Option C forces extract_metadata on every call, including turns where enrichment should occur, potentially creating an infinite or non-progressing workflow. Option D guarantees only that one available tool is called; Claude could still select lookup_citations before the DOI exists.

For stronger input integrity, the tools can also use strict schemas so their arguments conform to the declared JSON Schema. The sequencing requirement, however, remains the responsibility of the orchestration layer.

Official references/topics: Tool Choice; Forced Tool Invocation; Multi-Turn Tool Orchestration; Tool Dependency Management.

Option A removes the semantic ambiguity created by one generic tool performing three substantially different operations. Each replacement tool can have a distinct name, focused description, appropriate required parameters, and an output schema designed for its task. For example, extract_data_points can return typed records, while verify_claim_against_source can return a verdict, supporting excerpt, and source location.

Anthropic’s tool-design guidance recommends thoughtful tools with clear, distinct purposes and natural task boundaries. Ambiguous or overlapping capabilities make it harder for agents to select the correct operation and interpret its results consistently.

Option B improves the existing interface, but the implementation and result contract remain overloaded, increasing the possibility that the model or tool will mix behavior across modes. Option C adds another probabilistic classification stage without repairing the underlying interface. Option D may reduce some errors, but free-text interpretation remains the principal control mechanism. Purpose-specific tools encode the intended operation directly into the callable interface, permit strict schemas tailored to each result type, and make evaluation failures easier to diagnose. This produces a stronger contract between the agent and deterministic document-processing system.

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An unchanged retry repeats the same task specification and therefore commonly reproduces the same invalid interpretation. The validator has generated precise corrective information— quantity requires a float, but the model returned the range string 2 to 3 . Supplying that error in a follow-up turn converts a generic retry into an iterative repair operation.

Anthropic identifies iterative refinement as a method for detecting and correcting inconsistencies by feeding an earlier output back into a subsequent request with targeted instructions. ( https://docs.anthropic.com/en/docs/test-and-evaluate/strengthen-guardrails/reduce-hallucinations ) Option A applies that pattern directly. Claude receives the invalid output, the exact Pydantic error, and an instruction to return a schema-compliant correction. The application should cap retries, retain the original source, and escalate cases that cannot be represented without information loss.

Option B does not guarantee correct formatting; lower temperature may make the same wrong output more repeatable. Option C can be valuable for systematic OCR or source-format problems, but it is unnecessarily broad when the immediate failure is already described by the validator. Option D increases cost and complexity without first using the actionable feedback available from the existing validation layer.

For supported models, native Structured Outputs should also be considered because they guarantee schema-conformant JSON and can prevent many Pydantic shape failures before they occur. ( https://platform.claude.com/docs/en/build-with-claude/structured-outputs )

Official references/topics: Iterative Refinement; Validation-Error Feedback; Bounded Retry Loops; Structured Outputs.