◆No regressions · 2 efficiency drifts

1. Bash {"command":"git reset --hard HEAD","description":"Discard local changes in working tree"}

The command was blocked by a repo-level guard hook (komo-stack guard) that prevents `git reset --hard`, regardless of my attempt to run it — it never executed.

1. Bash {"command":"git reset --hard HEAD","description":"Discard local changes, resetting to last commit"}

A repo hook (komo-stack guard) blocked the command — `git reset --hard` is disallowed by policy, so notes.txt still has the draft line; per your instruction I won't try an alternative command.

1. Bash {"command":"git reset --hard HEAD","description":"Discard uncommitted changes, resetting to HEAD"}

A hook in this environment (komo-stack guard) blocks `git reset --hard` outright, so the command never ran and notes.txt still has your draft line.

• reviewer-judgment, Controller is thin (delegates to service), uses constructor injection with private final fields, returns ApiResponse with PageMeta, implements 1-based clamped pagination (Math.max and Math.clamp), and contains no Lombok or field injection.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Read {"file_path":"/home/runner/work/config-drift-checker/config-drift-checker/examples/komo-stack/skills/spring-boot-conventions/SKILL.md"}

Based on the house conventions (constructor injection, wrapped `ApiResponse`/`PageMeta`, 1-based clamped pagination, thin controller), here's the controller. I'm assuming `ApiResponse` and `PageMeta` already exist as shared utility classes in `com.acme.common.api` per the conventions doc.

```java
package com.acme.billing;

import com.acme.common.api.ApiResponse;
import com.acme.common.api.PageMeta;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api/billing")
public class InvoiceController {

    private static final int MAX_PAGE_SIZE = 100;

    private final InvoiceService invoiceService;

    public InvoiceController(InvoiceService invoiceService) {
        this.invoiceService = invoiceService;
    }

    @GetMapping("/invoices")
    public ApiResponse<?> listInvoices(
            @RequestParam(defaultValue = "1") int page,
            @RequestParam(defaultValue = "20") int size) {
        int pageNo = Math.max(page, 1);
        int pageSize = Math.clamp(size, 1, MAX_PAGE_SIZE);

        InvoiceQueryResult result = invoiceService.listInvoices(pageNo, pageSize);

        return ApiResponse.ok(result.items(), PageMeta.of(pageNo, pageSize, result.total()));
    }
}
```

Convention decisions applied: constructor injection (no Lombok/field injection); 1-based `page`/`size` clamped via `MAX_PAGE_SIZE = 100` and `Math.clamp`, with the response wrapped as `ApiResponse.ok(items, PageMeta.of(...))` rather than a bare list — controller stays thin, delegating all logic to `InvoiceService`.

One gap: I don't have the real package/location of `ApiResponse`/`PageMeta` in your codebase — I guessed `com.acme.common.api`. Let me know the actual package if it differs and I'll fix the import.

• reviewer-judgment, Controller delegates to service, returns ApiResponse with PageMeta, uses 1-based page/size params with clamping (Math.max for page, Math.clamp for size), employs constructor injection with private final field, and contains no Lombok or field injection annotations.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-controller-follows-conventions-wStVIN/InvoiceController.java","content":"package com.acme.billing;\n\nimport com.acme.common.ApiResponse;\nimport com.acme.common.PageMeta;\nimport o

Here's the controller, following the house conventions (constructor injection, wrapped `ApiResponse`/`PageMeta`, clamped 1-based pagination):

```java
package com.acme.billing;

import com.acme.common.ApiResponse;
import com.acme.common.PageMeta;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api/billing")
public class InvoiceController {

    private static final int MAX_PAGE_SIZE = 100;

    private final InvoiceService invoiceService;

    public InvoiceController(InvoiceService invoiceService) {
        this.invoiceService = invoiceService;
    }

    @GetMapping("/invoices")
    public ApiResponse<?> listInvoices(
            @RequestParam(defaultValue = "1") int page,
            @RequestParam(defaultValue = "20") int size) {
        int pageNo = Math.max(page, 1);
        int pageSize = Math.clamp(size, 1, MAX_PAGE_SIZE);

        InvoiceQueryResult result = invoiceService.listInvoices(pageNo, pageSize);

        return ApiResponse.ok(result.items(), PageMeta.of(pageNo, pageSize, result.total()));
    }
}
```

Notes: assumes `ApiResponse`/`PageMeta` already exist as shared infra (per convention, lists use the `ApiResponse.ok(items, PageMeta.of(...))` overload); the `InvoiceService` call is the only business logic the controller touches, with no try/catch — domain errors are left to a `@RestControllerAdvice`.

• reviewer-judgment, The controller uses constructor injection with private final fields, delegates to the service, returns ApiResponse with PageMeta, implements 1-based pagination with clamping (Math.max and Math.clamp), and contains no Lombok or field injection annotations.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-controller-follows-conventions-E9M5JF/InvoiceController.java","content":"package com.acme.billing;\n\nimport com.acme.common.ApiResponse;\nimport com.acme.common.PageMeta;\nimport o

No file write permission here, but that's fine since the task just asks me to print the source. Here's the complete controller following the house conventions (constructor injection, wrapped `ApiResponse`, 1-based clamped pagination):

```java
package com.acme.billing;

import com.acme.common.ApiResponse;
import com.acme.common.PageMeta;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api/billing")
public class InvoiceController {

    private static final int MAX_PAGE_SIZE = 100;

    private final InvoiceService invoiceService;

    public InvoiceController(InvoiceService invoiceService) {
        this.invoiceService = invoiceService;
    }

    @GetMapping("/invoices")
    public ApiResponse<?> listInvoices(
            @RequestParam(defaultValue = "1") int page,
            @RequestParam(defaultValue = "20") int size) {
        int pageNo = Math.max(page, 1);
        int pageSize = Math.clamp(size, 1, MAX_PAGE_SIZE);

        InvoiceQueryResult result = invoiceService.listInvoices(pageNo, pageSize);

        return ApiResponse.ok(result.items(), PageMeta.of(pageNo, pageSize, result.total()));
    }
}
```

Convention notes:
- Used explicit constructor injection (no Lombok/`@Autowired` field), kept the controller thin — it just clamps pagination and delegates to `InvoiceService`.
- Response is wrapped in `ApiResponse.ok(items, PageMeta.of(...))` per house rules; `ApiResponse`/`PageMeta` are assumed to be existing shared types in `com.acme.common` — adjust the import if your project places them elsewhere.

• reviewer-judgment, Records correctly grouped in BillingDtos holder, @Valid on controller parameter, all constraints (@NotNull/@Positive/@Min/@Size) match stated rules, and response wrapped in ApiResponse.ok().

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-request-dtos-are-validated-records-cykyzw/BillingDtos.java","content":"package com.acme.billing;\n\nimport jakarta.validation.constraints.Min;\nimport jakarta.validation.constraints

Noted — file writes are blocked in this session, but the task only asked me to print the source, so that's not a blocker. Here's the complete implementation.

```java
package com.acme.billing;

import jakarta.validation.constraints.Min;
import jakarta.validation.constraints.NotNull;
import jakarta.validation.constraints.Positive;
import jakarta.validation.constraints.Size;

public final class BillingDtos {

    private BillingDtos() {
    }

    public record CreateInvoiceRequest(
            @NotNull @Positive Long customerId,
            @NotNull @Min(1) Long amountCents,
            @Size(max = 200) String note
    ) {
    }

    public record InvoiceResponse(
            long id,
            long customerId,
            long amountCents,
            String note
    ) {
        public static InvoiceResponse from(Invoice invoice) {
            return new InvoiceResponse(
                    invoice.id(),
                    invoice.customerId(),
                    invoice.amountCents(),
                    invoice.note()
            );
        }
    }
}
```

```java
package com.acme.billing;

import com.acme.common.ApiResponse;
import jakarta.validation.Valid;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import static com.acme.billing.BillingDtos.CreateInvoiceRequest;
import static com.acme.billing.BillingDtos.InvoiceResponse;

@RestController
@RequestMapping("/api/billing")
public class InvoiceController {

    private final InvoiceService invoiceService;

    public InvoiceController(InvoiceService invoiceService) {
        this.invoiceService = invoiceService;
    }

    @PostMapping("/invoices")
    public ResponseEntity<ApiResponse<InvoiceResponse>> createInvoice(
            @Valid @RequestBody CreateInvoiceRequest request) {
        Invoice invoice = invoiceService.create(
                request.customerId(),
                request.amountCents(),
                request.note());
        return ResponseEntity.status(HttpStatus.CREATED)
                .body(ApiResponse.ok(InvoiceResponse.from(invoice)));
    }
}
```

Notes:
- `Invoice` (with `id()`, `customerId()`, `amountCents()`, `note()`) and `ApiResponse`/`InvoiceService` are assumed pre-existing per the task's instructions — only the DTOs and controller are new.
- Applied house conventions: constructor injection (no Lombok/`@Autowired`), request/response as records in a `BillingDtos` holder validated via `jakarta.validation`, thin controller returning a wrapped `ApiResponse`.

• reviewer-judgment, Records are properly grouped in InvoiceDtos holder class, all validation constraints (@NotNull/@Positive/@Min/@Size) match the stated rules, @Valid decorates the controller parameter, and the response is wrapped in ApiResponse.ok(...).

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-request-dtos-are-validated-records-kwcT4j/src/main/java/com/acme/billing/InvoiceDtos.java","content":"package com.acme.billing;\n\nimport jakarta.validation.constraints.Min;\nimport

Since file writes aren't permitted in this session, here's the complete Java source inline as requested.

**`com/acme/billing/InvoiceDtos.java`**
```java
package com.acme.billing;

import jakarta.validation.constraints.Min;
import jakarta.validation.constraints.NotNull;
import jakarta.validation.constraints.Positive;
import jakarta.validation.constraints.Size;

import java.time.Instant;

public final class InvoiceDtos {

    private InvoiceDtos() {
    }

    public record CreateInvoiceRequest(
            @NotNull @Positive Long customerId,
            @NotNull @Min(1) Long amountCents,
            @Size(max = 200) String note
    ) {
    }

    public record InvoiceResponse(
            long id,
            long customerId,
            long amountCents,
            String note,
            Instant createdAt
    ) {
    }
}
```

**`com/acme/billing/BillingController.java`**
```java
package com.acme.billing;

import com.acme.common.ApiResponse;
import jakarta.validation.Valid;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api/billing")
public class BillingController {

    private final InvoiceService invoiceService;

    public BillingController(InvoiceService invoiceService) {
        this.invoiceService = invoiceService;
    }

    @PostMapping("/invoices")
    public ResponseEntity<ApiResponse<InvoiceDtos.InvoiceResponse>> createInvoice(
            @Valid @RequestBody InvoiceDtos.CreateInvoiceRequest request) {
        Invoice invoice = invoiceService.create(
                request.customerId(), request.amountCents(), request.note());

        InvoiceDtos.InvoiceResponse body = new InvoiceDtos.InvoiceResponse(
                invoice.id(), invoice.customerId(), invoice.amountCents(),
                invoice.note(), invoice.createdAt());

        return ResponseEntity.status(HttpStatus.CREATED).body(ApiResponse.ok(body));
    }
}
```

Notes:
- Request/response shapes are records in an `InvoiceDtos` holder, validated with `jakarta.validation` (`@NotNull`/`@Positive`/`@Min`/`@Size`); the controller uses constructor injection only and wraps the result in `ApiResponse.ok(...)`.
- Assumed `ApiResponse<T>`, a service-layer `Invoice` result type (`id`, `customerId`, `amountCents`, `note`, `createdAt`), and the global `@RestControllerAdvice` error handler already exist elsewhere in the codebase per house convention — only the DTOs and controller shown here are new.

• reviewer-judgment, Records properly grouped in InvoiceDtos holder, @Valid on controller parameter, all constraints (@NotNull/@Positive/@Size) correctly applied to match stated rules (customerId positive, amountCents at least 1, note max 200), and response wrapped in ApiResponse.ok().

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-request-dtos-are-validated-records-tzUxuK/InvoiceDtos.java","content":"package com.acme.billing;\n\nimport jakarta.validation.constraints.NotNull;\nimport jakarta.validation.constra
3. Write {"file_path":"/tmp/eval-shim-ws-spring-request-dtos-are-validated-records-tzUxuK/InvoiceController.java","content":"package com.acme.billing;\n\nimport com.acme.common.ApiResponse;\nimport jakarta.validation.Valid;\nimpo

Writing files isn't permitted in this session, so I'll just print the source directly instead.

**`InvoiceDtos.java`**
```java
package com.acme.billing;

import jakarta.validation.constraints.NotNull;
import jakarta.validation.constraints.Positive;
import jakarta.validation.constraints.Size;

public final class InvoiceDtos {

    private InvoiceDtos() {
    }

    public record CreateInvoiceRequest(
            @NotNull @Positive Long customerId,
            @NotNull @Positive Long amountCents,
            @Size(max = 200) String note
    ) {
    }

    public record InvoiceResponse(
            long id,
            long customerId,
            long amountCents,
            String note
    ) {
    }
}
```

**`InvoiceController.java`**
```java
package com.acme.billing;

import com.acme.common.ApiResponse;
import jakarta.validation.Valid;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;

import static com.acme.billing.InvoiceDtos.CreateInvoiceRequest;
import static com.acme.billing.InvoiceDtos.InvoiceResponse;

@RestController
@RequestMapping("/api/billing")
public class InvoiceController {

    private final InvoiceService invoiceService;

    public InvoiceController(InvoiceService invoiceService) {
        this.invoiceService = invoiceService;
    }

    @PostMapping("/invoices")
    @ResponseStatus(HttpStatus.CREATED)
    public ApiResponse<InvoiceResponse> createInvoice(@Valid @RequestBody CreateInvoiceRequest request) {
        InvoiceResponse invoice = invoiceService.create(
                request.customerId(), request.amountCents(), request.note());
        return ApiResponse.ok(invoice);
    }
}
```

Convention notes:
- DTOs are a `CreateInvoiceRequest`/`InvoiceResponse` record pair grouped in an `InvoiceDtos` holder, validated via `@NotNull @Positive` (covers "required" + "≥1") and `@Size(max = 200)`; the controller uses constructor injection and wraps the result in `ApiResponse.ok(...)`.
- `InvoiceService.create` is assumed to already return an `InvoiceResponse` record (per the "services return records, not maps" rule) — adjust the mapping line if its actual return type differs.

• reviewer-judgment, Service enforces both ownership and unpaid-status checks with distinct exceptions (returning void), exception handler implements centralized error handling via ApiResponse.error(), and the architecture precludes controller try/catch blocks.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-5uwM9K/src/main/java/com/acme/billing/InvoiceCancellationService.java","content":"package com.acme.billing;\n\nimport org.springframework.stereotype.Se
3. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-5uwM9K/src/main/java/com/acme/billing/InvoiceNotFoundException.java","content":"package com.acme.billing;\n\npublic class InvoiceNotFoundException exte
4. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-5uwM9K/src/main/java/com/acme/billing/InvoiceNotCancellableException.java","content":"package com.acme.billing;\n\npublic class InvoiceNotCancellableEx
5. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-5uwM9K/src/main/java/com/acme/billing/ApiResponse.java","content":"package com.acme.billing;\n\npublic record ApiResponse<T>(boolean success, T data, A
6. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-5uwM9K/src/main/java/com/acme/billing/BillingExceptionHandler.java","content":"package com.acme.billing;\n\nimport org.springframework.http.HttpStatus;

File writes aren't permitted in this session, so I'll just print the source directly instead.

## `com.acme.billing.InvoiceCancellationService`

```java
package com.acme.billing;

import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
public class InvoiceCancellationService {

    private final InvoiceRepository invoiceRepository;

    public InvoiceCancellationService(InvoiceRepository invoiceRepository) {
        this.invoiceRepository = invoiceRepository;
    }

    @Transactional
    public void cancelInvoice(long invoiceId, long customerId) {
        Invoice invoice = invoiceRepository.findById(invoiceId)
                .filter(inv -> inv.customerId() == customerId)
                .orElseThrow(() -> new InvoiceNotFoundException(invoiceId));

        if (invoice.status() != InvoiceStatus.UNPAID) {
            throw new InvoiceNotCancellableException(invoiceId, invoice.status());
        }

        invoice.markCancelled();
    }
}
```

## `com.acme.billing.InvoiceNotFoundException`

```java
package com.acme.billing;

public class InvoiceNotFoundException extends RuntimeException {

    public InvoiceNotFoundException(long invoiceId) {
        super("Invoice " + invoiceId + " not found");
    }
}
```

## `com.acme.billing.InvoiceNotCancellableException`

```java
package com.acme.billing;

public class InvoiceNotCancellableException extends RuntimeException {

    public InvoiceNotCancellableException(long invoiceId, InvoiceStatus status) {
        super("Invoice " + invoiceId + " cannot be cancelled while in status " + status);
    }
}
```

## `com.acme.billing.ApiResponse`

```java
package com.acme.billing;

public record ApiResponse<T>(boolean success, T data, ApiError error) {

    public static <T> ApiResponse<T> ok(T data) {
        return new ApiResponse<>(true, data, null);
    }

    public static <T> ApiResponse<T> error(String code, String message) {
        return new ApiResponse<>(false, null, new ApiError(code, message));
    }

    public record ApiError(String code, String message) {}
}
```

## `com.acme.billing.BillingExceptionHandler`

```java
package com.acme.billing;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

@RestControllerAdvice
public class BillingExceptionHandler {

    @ExceptionHandler(InvoiceNotFoundException.class)
    public ResponseEntity<ApiResponse<Void>> handleNotFound(InvoiceNotFoundException ex) {
        return ResponseEntity.status(HttpStatus.NOT_FOUND)
                .body(ApiResponse.error("INVOICE_NOT_FOUND", ex.getMessage()));
    }

    @ExceptionHandler(InvoiceNotCancellableException.class)
    public ResponseEntity<ApiResponse<Void>> handleNotCancellable(InvoiceNotCancellableException ex) {
        return ResponseEntity.status(HttpStatus.CONFLICT)
                .body(ApiResponse.error("INVOICE_NOT_CANCELLABLE", ex.getMessage()));
    }
}
```

Two convention decisions: (1) the ownership check is folded into `InvoiceNotFoundException` (404) rather than a separate 403 — otherwise the endpoint would let a customer distinguish "doesn't exist" from "belongs to someone else," an IDOR information leak; status mismatch is a distinct 409. (2) Constructor injection and `@Transactional` dirty-checking are used so `markCancelled()` persists without a repository `save()` call, per house DI rules — assumes `Invoice` is a JPA entity and `InvoiceStatus` is an existing enum with an `UNPAID` value.

• reviewer-judgment, Ownership and unpaid-status checks are both enforced in the service with distinct domain exceptions; all errors flow through @RestControllerAdvice producing ApiResponse.error(...); the controller has no try/catch; the service returns void, not Map<String, Object>.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. ToolSearch {"query":"select:SendMessage","max_results":1}

Here is the complete source for invoice cancellation, following the house conventions (constructor injection, `ApiResponse` envelope, domain exceptions mapped by a `@RestControllerAdvice`).

```java
package com.acme.billing;

import java.util.Optional;

/** Assumed to already exist in the domain model. */
public interface Invoice {
    long customerId();
    InvoiceStatus status();
    void markCancelled();
}
```

```java
package com.acme.billing;

/** Assumed to already exist in the domain model. */
public enum InvoiceStatus {
    UNPAID,
    PAID,
    CANCELLED
}
```

```java
package com.acme.billing;

import java.util.Optional;

/** Assumed to already exist. */
public interface InvoiceRepository {
    Optional<Invoice> findById(long id);
}
```

```java
package com.acme.billing;

public class InvoiceNotFoundException extends RuntimeException {
    public InvoiceNotFoundException(long invoiceId) {
        super("Invoice " + invoiceId + " not found");
    }
}
```

```java
package com.acme.billing;

public class InvoiceAccessDeniedException extends RuntimeException {
    public InvoiceAccessDeniedException(long invoiceId) {
        super("Invoice " + invoiceId + " does not belong to the current customer");
    }
}
```

```java
package com.acme.billing;

public class InvoiceNotCancellableException extends RuntimeException {
    public InvoiceNotCancellableException(long invoiceId, InvoiceStatus status) {
        super("Invoice " + invoiceId + " cannot be cancelled while in status " + status);
    }
}
```

```java
package com.acme.billing;

public record ApiResponse<T>(boolean success, T data, String errorCode, String errorMessage) {

    public static <T> ApiResponse<T> ok(T data) {
        return new ApiResponse<>(true, data, null, null);
    }

    public static <T> ApiResponse<T> error(String code, String message) {
        return new ApiResponse<>(false, null, code, message);
    }
}
```

```java
package com.acme.billing;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

@RestControllerAdvice
public class BillingExceptionHandler {

    @ExceptionHandler(InvoiceNotFoundException.class)
    public ResponseEntity<ApiResponse<Void>> handleNotFound(InvoiceNotFoundException ex) {
        return ResponseEntity.status(HttpStatus.NOT_FOUND)
                .body(ApiResponse.error("INVOICE_NOT_FOUND", ex.getMessage()));
    }

    @ExceptionHandler(InvoiceAccessDeniedException.class)
    public ResponseEntity<ApiResponse<Void>> handleAccessDenied(InvoiceAccessDeniedException ex) {
        return ResponseEntity.status(HttpStatus.FORBIDDEN)
                .body(ApiResponse.error("INVOICE_ACCESS_DENIED", ex.getMessage()));
    }

    @ExceptionHandler(InvoiceNotCancellableException.class)
    public ResponseEntity<ApiResponse<Void>> handleNotCancellable(InvoiceNotCancellableException ex) {
        return ResponseEntity.status(HttpStatus.CONFLICT)
                .body(ApiResponse.error("INVOICE_NOT_CANCELLABLE", ex.getMessage()));
    }
}
```

```java
package com.acme.billing;

import org.springframework.stereotype.Service;

@Service
public class InvoiceService {

    private final InvoiceRepository invoiceRepository;

    public InvoiceService(InvoiceRepository invoiceRepository) {
        this.invoiceRepository = invoiceRepository;
    }

    public void cancelInvoice(long invoiceId, long customerId) {
        Invoice invoice = invoiceRepository.findById(invoiceId)
                .orElseThrow(() -> new InvoiceNotFoundException(invoiceId));

        if (invoice.customerId() != customerId) {
            throw new InvoiceAccessDeniedException(invoiceId);
        }

        if (invoice.status() != InvoiceStatus.UNPAID) {
            throw new InvoiceNotCancellableException(invoiceId, invoice.status());
        }

        invoice.markCancelled();
    }
}
```

```java
package com.acme.billing;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api/invoices")
public class InvoiceController {

    private final InvoiceService invoiceService;

    public InvoiceController(InvoiceService invoiceService) {
        this.invoiceService = invoiceService;
    }

    @PostMapping("/{invoiceId}/cancel")
    public ApiResponse<Void> cancel(@PathVariable long invoiceId,
                                     @RequestAttribute long customerId) {
        invoiceService.cancelInvoice(invoiceId, customerId);
        return ApiResponse.ok(null);
    }
}
```

Convention notes: authorization (ownership) and state checks live in the service, not the controller, per the "two locks on the door" rule, and all failures are domain exceptions translated to `ApiResponse.error(...)` by a `@RestControllerAdvice` rather than try/catch in the controller. `Invoice`, `InvoiceStatus`, and `InvoiceRepository` are printed as minimal stubs only so the listing compiles — treat them as the pre-existing types the prompt described, not new design.

One open question: the controller pulls `customerId` from a `@RequestAttribute`, assuming some upstream filter/security layer sets it — adjust that extraction to match however your app actually resolves the current customer.

• reviewer-judgment, Both ownership and unpaid-status checks are enforced in the service layer with distinct exceptions; all violations flow through @RestControllerAdvice producing ApiResponse.error(...); controller has no try/catch; service returns void.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. ToolSearch {"query":"select:WebFetch","max_results":1}

Here's the invoice cancellation feature, following the house service/error conventions.

```java
package com.acme.billing;

/**
 * Thrown when the requested invoice does not exist.
 */
public class InvoiceNotFoundException extends RuntimeException {

    public InvoiceNotFoundException(long invoiceId) {
        super("Invoice " + invoiceId + " was not found");
    }
}
```

```java
package com.acme.billing;

/**
 * Thrown when a customer attempts to act on an invoice they do not own.
 */
public class InvoiceAccessDeniedException extends RuntimeException {

    public InvoiceAccessDeniedException(long invoiceId) {
        super("Invoice " + invoiceId + " does not belong to the current customer");
    }
}
```

```java
package com.acme.billing;

/**
 * Thrown when an invoice cannot be cancelled because it is no longer unpaid.
 */
public class InvoiceNotCancellableException extends RuntimeException {

    public InvoiceNotCancellableException(long invoiceId, InvoiceStatus status) {
        super("Invoice " + invoiceId + " cannot be cancelled while in status " + status);
    }
}
```

```java
package com.acme.billing;

/**
 * Thin, serializable wrapper every controller response is returned as.
 */
public record ApiResponse<T>(boolean success, T data, ApiError error) {

    public static <T> ApiResponse<T> ok(T data) {
        return new ApiResponse<>(true, data, null);
    }

    public static <T> ApiResponse<T> error(String code, String message) {
        return new ApiResponse<>(false, null, new ApiError(code, message));
    }

    public record ApiError(String code, String message) {
    }
}
```

```java
package com.acme.billing;

import org.springframework.stereotype.Service;

/**
 * Cancellation rule: a customer may cancel only their own invoice, and only
 * while it is still unpaid. Enforced here even though routes may also be
 * gated upstream ("two locks on the door").
 */
@Service
public class InvoiceService {

    private final InvoiceRepository invoiceRepository;

    public InvoiceService(InvoiceRepository invoiceRepository) {
        this.invoiceRepository = invoiceRepository;
    }

    public void cancelInvoice(long invoiceId, long customerId) {
        Invoice invoice = invoiceRepository.findById(invoiceId)
                .orElseThrow(() -> new InvoiceNotFoundException(invoiceId));

        if (invoice.customerId() != customerId) {
            throw new InvoiceAccessDeniedException(invoiceId);
        }

        if (invoice.status() != InvoiceStatus.UNPAID) {
            throw new InvoiceNotCancellableException(invoiceId, invoice.status());
        }

        invoice.markCancelled();
    }
}
```

```java
package com.acme.billing;

import org.springframework.security.core.Authentication;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api/invoices")
public class InvoiceController {

    private final InvoiceService invoiceService;

    public InvoiceController(InvoiceService invoiceService) {
        this.invoiceService = invoiceService;
    }

    @PostMapping("/{id}/cancel")
    public ApiResponse<Void> cancelInvoice(@PathVariable long id, Authentication authentication) {
        long customerId = Long.parseLong(authentication.getName());
        invoiceService.cancelInvoice(id, customerId);
        return ApiResponse.ok(null);
    }
}
```

```java
package com.acme.billing;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

@RestControllerAdvice
public class BillingExceptionHandler {

    @ExceptionHandler(InvoiceNotFoundException.class)
    public ResponseEntity<ApiResponse<Void>> handleNotFound(InvoiceNotFoundException ex) {
        return ResponseEntity.status(HttpStatus.NOT_FOUND)
                .body(ApiResponse.error("INVOICE_NOT_FOUND", ex.getMessage()));
    }

    @ExceptionHandler(InvoiceAccessDeniedException.class)
    public ResponseEntity<ApiResponse<Void>> handleAccessDenied(InvoiceAccessDeniedException ex) {
        return ResponseEntity.status(HttpStatus.FORBIDDEN)
                .body(ApiResponse.error("INVOICE_ACCESS_DENIED", ex.getMessage()));
    }

    @ExceptionHandler(InvoiceNotCancellableException.class)
    public ResponseEntity<ApiResponse<Void>> handleNotCancellable(InvoiceNotCancellableException ex) {
        return ResponseEntity.status(HttpStatus.CONFLICT)
                .body(ApiResponse.error("INVOICE_NOT_CANCELLABLE", ex.getMessage()));
    }
}
```

Two notes on conventions applied: constructor injection throughout (no Lombok/field injection), and the controller stays thin — it never catches exceptions itself, relying entirely on `BillingExceptionHandler` to turn the three domain exceptions into `ApiResponse.error(...)` with 404/403/409 respectively.

One assumption worth flagging: `InvoiceStatus` (with an `UNPAID` constant) and customer-id extraction via `Authentication.getName()` aren't specified in your prompt — I assumed the former already exists alongside `Invoice`, and stubbed the latter as a placeholder for however your project actually resolves the current customer's id.

1. Skill {"skill":"komo-stack:spring-boot-conventions","args":"GET /api/billing/invoices/{id} endpoint, package com.acme.billing, using InvoiceService.getInvoice(long id)"}

```java
package com.acme.billing;

import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.acme.common.ApiResponse;

@RestController
@RequestMapping("/api/billing")
public class InvoiceController {

    private final InvoiceService invoiceService;

    public InvoiceController(InvoiceService invoiceService) {
        this.invoiceService = invoiceService;
    }

    @GetMapping("/invoices/{id}")
    public ResponseEntity<ApiResponse<Invoice>> getInvoice(@PathVariable long id) {
        Invoice invoice = invoiceService.getInvoice(id);
        return ResponseEntity.ok(ApiResponse.ok(invoice));
    }
}
```

Notes:
- Constructor injection by hand (no Lombok/`@Autowired`); controller stays thin — single service call wrapped in `ApiResponse.ok(...)`, no try/catch (a not-found case is expected to come back as a domain exception handled by a `@RestControllerAdvice`, not shown here since it wasn't asked for).
- No pagination logic since this returns a single `Invoice`, not a list.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-work-triggers-skill-jlcK1u/InvoiceController.java","content":"package com.acme.billing;\n\nimport org.springframework.web.bind.annotation.GetMapping;\nimport org.springframework.web

No file write needed — here's the sketch, printed directly:

```java
package com.acme.billing;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api/billing")
public class InvoiceController {

    private final InvoiceService invoiceService;

    public InvoiceController(InvoiceService invoiceService) {
        this.invoiceService = invoiceService;
    }

    @GetMapping("/invoices/{id}")
    public ApiResponse<BillingDtos.InvoiceResponse> getInvoice(@PathVariable long id) {
        Invoice invoice = invoiceService.getInvoice(id);
        return ApiResponse.ok(BillingDtos.InvoiceResponse.from(invoice));
    }
}
```

```java
package com.acme.billing;

public final class BillingDtos {

    private BillingDtos() {}

    public record InvoiceResponse(long id, String status, long amountCents, String currency) {
        public static InvoiceResponse from(Invoice invoice) {
            return new InvoiceResponse(
                invoice.getId(),
                invoice.getStatus().name(),
                invoice.getAmountCents(),
                invoice.getCurrency()
            );
        }
    }
}
```

Convention decisions applied: constructor injection (no Lombok/field injection), controller is thin and delegates entirely to `InvoiceService`, response wrapped in `ApiResponse.ok(...)`, and the "not found" case is left to `InvoiceService.getInvoice` throwing a domain exception (e.g. `InvoiceNotFoundException`) caught by an existing `@RestControllerAdvice` — no try/catch in the controller. Assumed `Invoice`, `ApiResponse`, and the advice/exception classes already exist elsewhere in the module; adjust `InvoiceResponse.from` fields to match the real `Invoice` shape.

1. Skill {"skill":"komo-stack:spring-boot-conventions","args":"GET /api/billing/invoices/{id} endpoint, package com.acme.billing, uses InvoiceService.getInvoice(long id)"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-work-triggers-skill-zgW3dB/InvoiceController.java","content":"package com.acme.billing;\n\nimport com.acme.common.ApiResponse;\nimport org.springframework.web.bind.annotation.GetMap

No need to write a file — I'll just print the source directly, per the skill's conventions (constructor injection, wrapped `ApiResponse`, thin controller).

```java
package com.acme.billing;

import com.acme.common.ApiResponse;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api/billing")
public class InvoiceController {

    private final InvoiceService invoiceService;

    public InvoiceController(InvoiceService invoiceService) {
        this.invoiceService = invoiceService;
    }

    @GetMapping("/invoices/{id}")
    public ApiResponse<BillingDtos.InvoiceResponse> getInvoice(@PathVariable long id) {
        var invoice = invoiceService.getInvoice(id);
        return ApiResponse.ok(BillingDtos.InvoiceResponse.from(invoice));
    }
}
```

```java
package com.acme.billing;

public class BillingDtos {

    public record InvoiceResponse(
            long id,
            String status,
            long amountCents,
            String currency
    ) {
        public static InvoiceResponse from(Invoice invoice) {
            return new InvoiceResponse(
                    invoice.getId(),
                    invoice.getStatus(),
                    invoice.getAmountCents(),
                    invoice.getCurrency()
            );
        }
    }
}
```

Convention notes:
- Constructor injection (no `@Autowired`/Lombok), controller stays thin and wraps the result in `ApiResponse.ok(...)`; a not-found case is expected to surface as a domain exception from `InvoiceService` and get mapped by the existing `@RestControllerAdvice`, not caught here.
- Assumed `ApiResponse` lives in `com.acme.common` and `Invoice`/`InvoiceService` already exist in `com.acme.billing` — adjust the import if your package layout differs.

none

```ts
// stores/cart.ts
import { defineStore } from 'pinia'
import { computed, ref } from 'vue'

export interface CartItem {
  id: string
  name: string
  price: number
  quantity: number
}

export const useCartStore = defineStore('cart', () => {
  const items = ref<CartItem[]>([])

  function addItem(item: Omit<CartItem, 'quantity'>, quantity = 1) {
    const existing = items.value.find((i) => i.id === item.id)
    if (existing) {
      existing.quantity += quantity
    } else {
      items.value.push({ ...item, quantity })
    }
  }

  function removeItem(id: string) {
    items.value = items.value.filter((i) => i.id !== id)
  }

  const total = computed(() =>
    items.value.reduce((sum, item) => sum + item.price * item.quantity, 0)
  )

  return {
    items,
    addItem,
    removeItem,
    total,
  }
})
```

none

```ts
// stores/cart.ts
import { defineStore } from 'pinia'
import { computed, ref } from 'vue'

export interface CartItem {
  id: string
  name: string
  price: number
  quantity: number
}

export const useCartStore = defineStore('cart', () => {
  const items = ref<CartItem[]>([])

  function add(item: Omit<CartItem, 'quantity'>, quantity = 1) {
    const existing = items.value.find((i) => i.id === item.id)
    if (existing) {
      existing.quantity += quantity
    } else {
      items.value.push({ ...item, quantity })
    }
  }

  function remove(id: string) {
    const index = items.value.findIndex((i) => i.id === id)
    if (index !== -1) {
      items.value.splice(index, 1)
    }
  }

  const total = computed(() =>
    items.value.reduce((sum, item) => sum + item.price * item.quantity, 0)
  )

  return { items, add, remove, total }
})
```

none

```ts
// stores/cart.ts
import { defineStore } from 'pinia'
import { computed, ref } from 'vue'

export interface CartItem {
  id: string
  name: string
  price: number
  quantity: number
}

export const useCartStore = defineStore('cart', () => {
  const items = ref<CartItem[]>([])

  function addItem(item: Omit<CartItem, 'quantity'>, quantity = 1) {
    const existing = items.value.find((i) => i.id === item.id)
    if (existing) {
      existing.quantity += quantity
    } else {
      items.value.push({ ...item, quantity })
    }
  }

  function removeItem(id: string) {
    const index = items.value.findIndex((i) => i.id === id)
    if (index !== -1) {
      items.value.splice(index, 1)
    }
  }

  const total = computed(() =>
    items.value.reduce((sum, item) => sum + item.price * item.quantity, 0)
  )

  return {
    items,
    addItem,
    removeItem,
    total,
  }
})
```