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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 It does not inherit outdated backend observations as though they were still authoritative.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.

Formatting is deterministic and should be enforced by deterministic tooling rather than stronger natural-language instructions. A PostToolUse hook executes after a successful tool operation. Matching Edit|Write restricts the hook to file modifications, allowing the edited file path to be passed directly to Prettier.

Anthropic provides this exact pattern in its official hooks guidance: configure a PostToolUse event with an Edit|Write matcher and run Prettier against the modified file. This ensures formatting occurs automatically after every relevant edit instead of depending on Claude remembering to execute a formatter. ( https://code.claude.com/docs/en/hooks-guide )

Option A still relies on instruction-following and unnecessarily loads procedural material. Option B asks another probabilistic model evaluation to determine whether formatting is correct, even though Prettier can enforce the result directly. A Stop hook also runs later than necessary. Option C improves contextual relevance but does not guarantee compliance; path-scoped rules remain instructions rather than enforcement controls.

The hook should be stored in project settings so the workflow is shared by the team. The formatter’s exit status should also be monitored so configuration or syntax failures are visible instead of silently ignored.

Official references/topics: Claude Code Hooks; PostToolUse; Edit|Write Matchers; Deterministic Formatting Enforcement.

The checklist is a reusable, task-specific procedure that should load only when a pull-request review is being performed. A /review command provides an explicit invocation mechanism, prevents repeated copy-and-paste, and keeps the checklist out of unrelated coding, debugging, and documentation sessions.

In current Claude Code terminology, custom commands have been consolidated into skills. A .claude/skills/review/SKILL.md file creates a /review command, while the legacy .claude/commands/review.md format remains supported. Anthropic recommends skills when users repeatedly supply the same checklist or multi-step procedure; unlike CLAUDE.md content, the skill body is loaded only when invoked or determined relevant. ( https://code.claude.com/docs/en/skills )

Option B introduces an isolated agent context when the requirement is primarily to inject a repeatable review procedure. A subagent could be useful for independent verification, but it is not necessary merely to avoid repasting the checklist. Option C bloats every session with instructions that apply only to code review. Option D controls editing permissions and planning behavior; it does not encode review criteria.

The review skill can also pre-authorize read-only tools and accept a pull-request identifier or branch as an argument.

Official references/topics: Claude Code Skills; Custom Slash Commands; On-Demand Instructions; Reusable Review Workflows.

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.

An aggregate accuracy value can conceal severe performance disparities. A system may achieve 97% overall accuracy while performing poorly on a low-volume document type, a critical financial field, or a specific edge case. Automating outputs solely from the aggregate figure could therefore expose downstream systems to concentrated, high-impact errors.

Anthropic’s evaluation guidance states that evaluations should be task-specific, reflect the real-world task distribution, and explicitly include edge cases. It also emphasizes multidimensional success criteria rather than reliance on a single global metric. ( https://docs.anthropic.com/en/docs/build-with-claude/develop-tests ) Option A applies those principles by stratifying performance according to document type and field. This reveals whether confidence is calibrated consistently and whether the proposed automation threshold remains safe for every operationally significant segment.

Option B is useful only after segment-level performance has been understood. Selecting a global threshold cannot correct a subgroup where confidence is systematically overstated. Option C is necessary governance work, but it treats the overall 97% result as though errors were uniformly distributed. Option D places unvalidated outputs into downstream systems and depends on passive error reporting, which may fail to detect silent corruption.

The correct deployment gate is therefore segmented validation, followed by threshold selection, downstream acceptance criteria, and a controlled pilot.

Official references/topics: Define Success Criteria; Task-Specific Evaluations; Edge-Case Coverage; Reliability Segmentation.

Limited review capacity should be concentrated on records with the highest probability of semantic error. Schema validation confirms that the response has the correct structure and data types; it does not establish that the extracted values are accurate. Ambiguous wording, contradictory passages, missing evidence, and model-reported uncertainty are direct indicators that an extraction requires human judgment.

Anthropic’s reliability guidance recommends permitting Claude to express uncertainty, grounding factual outputs in source material, and validating critical information because hallucination-reduction methods do not eliminate errors completely. These principles support routing uncertain or evidentially conflicted records to reviewers rather than treating syntactically valid output as automatically trustworthy. ( https://docs.anthropic.com/en/docs/test-and-evaluate/strengthen-guardrails/reduce-hallucinations )

Option B may waste reviewer capacity on clear, well-supported values while overlooking ambiguous errors in other fields. Option C is reactive: downstream acceptance does not guarantee semantic correctness, and silent errors may never produce processing failures. Option D provides an unbiased estimate of overall quality and should be retained as a secondary audit mechanism, but random selection is not the most efficient way to intercept risky records when only 5% can be reviewed.

In production, model confidence should not be treated as a calibrated probability by itself. It should be combined with objective signals such as contradictory source spans, missing citations, OCR quality, validation warnings, document type, and business impact.

Official references/topics: Human-in-the-Loop Review, Uncertainty Handling, Source Grounding, Risk-Based Escalation.

Option C creates an objective verification loop. The tests encode expected traversal behavior for disconnected graphs, cycle handling, weighted edges, invalid inputs, and performance constraints. Claude can implement the algorithm, execute the suite, inspect concrete failures, and refine the implementation until the measurable conditions pass.

Anthropic emphasizes giving Claude a verification mechanism such as tests, builds, linters, or fixture comparisons. Without an executable pass-or-fail check, Claude can only determine that an implementation appears complete. With tests, it can perform work, evaluate the result, and iterate using evidence rather than subjective judgment. Anthropic also recommends reproducing defects with failing tests before applying corrections. ( https://code.claude.com/docs/en/best-practices )

Option A may produce a thoughtful initial design but does not guarantee progressive improvement after implementation. Option B risks inheriting assumptions or deficiencies from a reference that may not match the project’s constraints. Option D depends on manual review and converts the developer into the primary verification system.

The test suite should include correctness fixtures, boundary cases, complexity-sensitive workloads, and regression tests added whenever a new failure is discovered. This makes every iteration cumulative: a correction must satisfy the new case without breaking previously validated behavior.

Official references/topics: Executable Verification; Test-Driven Iteration; Feedback Loops; Regression Testing.