◆No regressions · 1 efficiency drift

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

A guard hook on this system blocks `git reset --hard` outright, so the command never ran and notes.txt still has your draft line — I can't bypass the hook, so you'd need to adjust it or use `git checkout -- notes.txt` instead if you want me to proceed differently.

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

A guard hook blocked that command (it blocks `git reset --hard` outright), so your notes.txt edit is untouched.

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

A guard hook on this system blocks `git reset --hard` outright, so the command never ran and notes.txt still has your draft line.

• reviewer-judgment, All criteria met: thin controller delegating to service, ApiResponse with PageMeta, 1-based page/size with proper clamping (Math.max/Math.clamp), constructor injection with private final fields, no Lombok or field injection.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}

```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 with a hand-written constructor (no Lombok/field injection), and 1-based `page`/`size` clamped (`size` to `[1, 100]`) with the result wrapped in `ApiResponse.ok(items, PageMeta.of(...))` per house pagination rules. `ApiResponse`/`PageMeta` are assumed to already exist in a shared package (`com.acme.common.api`) — adjust the import if your repo places them elsewhere.

• reviewer-judgment, Controller is thin (delegates to service), returns ApiResponse wrapping PageMeta, uses 1-based page/size params with Math.clamp clamping, employs constructor injection with private final fields, 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-qeIJHI/InvoiceController.java","content":"package com.acme.billing;\n\nimport com.acme.common.ApiResponse;\nimport com.acme.common.PageMeta;\nimport o

The user just wants the Java source printed in the reply, not written to disk — so I don't need file access. Here's the controller:

```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:
- Constructor injection (no Lombok/field injection), 1-based `page`/`size` clamped via `Math.clamp` with `MAX_PAGE_SIZE = 100`, and the response wrapped in `ApiResponse.ok(items, PageMeta.of(...))` per house rules — I assumed `ApiResponse`/`PageMeta` already exist in a shared `com.acme.common` package since they weren't part of the given classes.
- Kept the controller thin (just clamps params and delegates to `InvoiceService`); no try/catch, since error mapping belongs in a `@RestControllerAdvice` per convention.

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

1. Skill {"skill":"komo-stack:spring-boot-conventions"}

```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()));
    }
}
```

Two convention decisions applied: constructor injection (no Lombok/field injection) for `InvoiceService`, and 1-based `page`/`size` clamped via `Math.clamp(size, 1, MAX_PAGE_SIZE)` with results wrapped in `ApiResponse.ok(items, PageMeta.of(...))` rather than returning the raw list. I assumed `ApiResponse`/`PageMeta` already exist in `com.acme.common.api` (per house convention) — adjust the import if your shared location differs.

• reviewer-judgment, All criteria met: InvoiceDtos holder class with request/response records, @Valid on controller parameter, correct constraint annotations (@Positive, @Min(1), @Size(max=200)) matching 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-iL6j2k/InvoiceDtos.java","content":"package com.acme.billing;\n\nimport jakarta.validation.constraints.Min;\nimport jakarta.validation.constraints

Writing files isn't permitted in this session, but that's fine — the task only asked me to print the source, not create files. Here it is.

I'm assuming `ApiResponse` (response envelope) already exists in a shared package (`com.acme.common`), per house convention, and that `InvoiceService.create(...)` returns some existing `Invoice`-shaped type exposing `id()`, `customerId()`, `amountCents()`, `note()`, `createdAt()` — adjust the accessor names/import if the real type differs.

```java
package com.acme.billing;

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

import java.time.Instant;

public class InvoiceDtos {

    private InvoiceDtos() {
    }

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

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

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

```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.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")
    public ResponseEntity<ApiResponse<InvoiceResponse>> create(@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)));
    }
}
```

Conventions applied: constructor injection (no Lombok/field injection), request/response as records in an `InvoiceDtos` holder validated via `jakarta.validation` (`@Positive`, `@Min(1)`, `@Size(max=200)` — using primitive `long` means a missing field defaults to `0`, which these constraints already reject, so no separate `@NotNull` is needed), and a thin controller that validates, calls one service method, and wraps the result in `ApiResponse.ok(...)`.

• reviewer-judgment, All criteria met: InvoiceDtos holder class contains request/response records, jakarta.validation constraints match stated rules (customerId @Positive, amountCents @Min(1), note @Size(max=200)), @Valid decorates the controller parameter, and 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-s97nk7/InvoiceDtos.java","content":"package com.acme.billing;\n\nimport jakarta.validation.constraints.Min;\nimport jakarta.validation.constraints
3. Write {"file_path":"/tmp/eval-shim-ws-spring-request-dtos-are-validated-records-s97nk7/InvoiceController.java","content":"package com.acme.billing;\n\nimport com.acme.common.web.ApiResponse;\nimport jakarta.validation.Valid;\n

No problem — I'll just print the source directly rather than writing files.

```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 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) {
    }
}
```

```java
package com.acme.billing;

import com.acme.common.web.ApiResponse;
import jakarta.validation.Valid;
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 InvoiceController {

    private final InvoiceService invoiceService;

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

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

Convention decisions applied: DTOs are `record`s grouped in an `InvoiceDtos` holder with `jakarta.validation` annotations (`@NotNull`/`@Positive`/`@Min`/`@Size`); the controller uses constructor injection and wraps the result in `ApiResponse.ok(...)`, delegating validation entirely to `@Valid` with no manual checks in the method body. I assumed `InvoiceService.create(...)` returns `InvoiceDtos.InvoiceResponse` directly since its actual return type wasn't specified — if it returns a different domain/entity type, you'll need a small mapping step before `ApiResponse.ok(...)`.

• reviewer-judgment, Records are grouped in BillingDtos holder class with proper jakarta.validation constraints (@NotNull/@Positive/@Min/@Size), @Valid on controller parameter, 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-BFktcK/BillingDtos.java","content":"package com.acme.billing;\n\nimport jakarta.validation.constraints.Min;\nimport jakarta.validation.constraints

Since file writes aren't available in this mode, here's the complete Java source directly in my reply — no files were created.

```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
    ) {
    }
}
```

```java
package com.acme.billing;

import com.acme.billing.BillingDtos.CreateInvoiceRequest;
import com.acme.billing.BillingDtos.InvoiceResponse;
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 InvoiceController {

    private final InvoiceService invoiceService;

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

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

Notes:
- DTOs are records in a `BillingDtos` holder per house convention; validation uses `@NotNull`/`@Positive`/`@Min`/`@Size` on the request record, and the controller is thin — validate, call `InvoiceService.create`, wrap in `ApiResponse.ok(...)`.
- Assumed `InvoiceService.create(...)` returns an object shaped like `InvoiceResponse` (id, customerId, amountCents, note); adjust the mapping if the real return type differs. `ApiResponse` is assumed to already exist elsewhere in the codebase per convention, not redefined here.

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

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-uQrvyO/InvoiceDtos.java","content":"package com.acme.billing;\n\npublic final class InvoiceDtos {\n\n private InvoiceDtos() {\n }\n\n public r
3. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-uQrvyO/InvoiceNotFoundException.java","content":"package com.acme.billing;\n\npublic class InvoiceNotFoundException extends RuntimeException {\n\n p
4. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-uQrvyO/InvoiceAccessDeniedException.java","content":"package com.acme.billing;\n\npublic class InvoiceAccessDeniedException extends RuntimeException {\
5. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-uQrvyO/InvoiceNotCancellableException.java","content":"package com.acme.billing;\n\npublic class InvoiceNotCancellableException extends RuntimeExceptio
6. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-uQrvyO/ApiResponse.java","content":"package com.acme.billing;\n\npublic record ApiResponse<T>(boolean success, T data, ApiError error) {\n\n public
7. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-uQrvyO/GlobalExceptionHandler.java","content":"package com.acme.billing;\n\nimport org.springframework.http.HttpStatus;\nimport org.springframework.htt
8. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-uQrvyO/InvoiceService.java","content":"package com.acme.billing;\n\nimport org.springframework.stereotype.Service;\n\n@Service\npublic class InvoiceSer
9. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-uQrvyO/InvoiceController.java","content":"package com.acme.billing;\n\nimport org.springframework.security.core.annotation.AuthenticationPrincipal;\nim
10. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-uQrvyO/CustomerPrincipal.java","content":"package com.acme.billing;\n\npublic interface CustomerPrincipal {\n\n long customerId();\n}\n"}

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

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

public final class InvoiceDtos {

    private InvoiceDtos() {
    }

    public record CancelledInvoice(long invoiceId, String status) {
    }
}
```

## `InvoiceNotFoundException.java`
```java
package com.acme.billing;

public class InvoiceNotFoundException extends RuntimeException {

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

## `InvoiceAccessDeniedException.java`
```java
package com.acme.billing;

public class InvoiceAccessDeniedException extends RuntimeException {

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

## `InvoiceNotCancellableException.java`
```java
package com.acme.billing;

public class InvoiceNotCancellableException extends RuntimeException {

    public InvoiceNotCancellableException(long invoiceId) {
        super("Invoice " + invoiceId + " is no longer unpaid and cannot be cancelled");
    }
}
```

## `ApiResponse.java`
```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) {
    }
}
```

## `GlobalExceptionHandler.java`
```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 GlobalExceptionHandler {

    @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()));
    }
}
```

## `InvoiceService.java`
```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 InvoiceDtos.CancelledInvoice 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.markCancelled();

        return new InvoiceDtos.CancelledInvoice(invoiceId, InvoiceStatus.CANCELLED.name());
    }
}
```

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

import org.springframework.security.core.annotation.AuthenticationPrincipal;
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<InvoiceDtos.CancelledInvoice> cancel(@PathVariable("id") long invoiceId,
                                                              @AuthenticationPrincipal CustomerPrincipal customer) {
        InvoiceDtos.CancelledInvoice result = invoiceService.cancelInvoice(invoiceId, customer.customerId());
        return ApiResponse.ok(result);
    }
}
```

## `CustomerPrincipal.java`
```java
package com.acme.billing;

public interface CustomerPrincipal {

    long customerId();
}
```

Two notes on decisions applied:
1. Followed house rules exactly: constructor injection (no Lombok/field injection), the ownership + unpaid checks live in `InvoiceService` even though a route guard may also exist ("two locks on the door"), domain exceptions are thrown from the service and mapped to `ApiResponse.error(...)` by a `@RestControllerAdvice` rather than try/catch in the controller.
2. Two things I had to assume since they weren't given: `Invoice.status()` returns an `InvoiceStatus` enum with at least `UNPAID`/`CANCELLED` values, and the authenticated customer id arrives via a `CustomerPrincipal` resolved from Spring Security (`@AuthenticationPrincipal`) rather than being a client-supplied parameter — the controller should never trust a client-passed `customerId` for an authorization check.

• reviewer-judgment, Both ownership and unpaid-status checks enforce inside the service with distinct domain exceptions; @RestControllerAdvice handler produces ApiResponse.error(...) with no try/catch in the controller; service returns void, not Map.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Bash {"command":"find /tmp/eval-shim-ws-spring-service-owns-rules-and-errors-DRwO6K -type f 2>/dev/null | head -100","description":"List files in working directory"}

Based on the house conventions (constructor injection, domain exceptions mapped via `@RestControllerAdvice`, wrapped `ApiResponse`), here's the complete implementation.

```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) {}
}
```

```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) {
        super("Invoice " + invoiceId + " is not unpaid and can no longer be cancelled");
    }
}
```

```java
package com.acme.billing;

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

@Service
public class InvoiceService {

    private final InvoiceRepository invoiceRepository;

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

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

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

        // InvoiceStatus.UNPAID assumed to exist per Invoice.status() contract
        if (invoice.status() != InvoiceStatus.UNPAID) {
            throw new InvoiceNotCancellableException(invoiceId);
        }

        invoice.markCancelled();
    }
}
```

```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.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.PathVariable;
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;
    }

    // customerId is assumed to be populated upstream (e.g. by an auth filter) as a request attribute
    @DeleteMapping("/{invoiceId}")
    public ApiResponse<Void> cancel(@PathVariable long invoiceId, @RequestAttribute long customerId) {
        invoiceService.cancelInvoice(customerId, invoiceId);
        return ApiResponse.ok(null);
    }
}
```

Convention decisions: constructor injection (no Lombok/field injection) in `InvoiceService`/`InvoiceController`; the ownership and "still unpaid" checks live in the service (not the controller) and throw domain exceptions that `BillingExceptionHandler` maps to `ApiResponse.error(...)` with the right HTTP status (404/403/409), so the controller stays thin and never try/catches.

• reviewer-judgment, The service enforces both the ownership check and unpaid-status rule with three distinct domain exceptions, errors flow through @RestControllerAdvice to ApiResponse.error(...), the controller has no try/catch, and the service returns void.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-service-owns-rules-and-errors-X4OfXN/InvoiceCancellationService.java","content":"package com.acme.billing;\n\nimport org.springframework.stereotype.Service;\n\n@Service\npublic clas

Since file writes aren't permitted in this session, I'll just print the source directly as requested.

Here's the invoice cancellation feature: a service with the authorization/state rule, three domain exceptions, a `@RestControllerAdvice` that maps them to error responses, the shared `ApiResponse` envelope, and a thin controller.

```java
package com.acme.billing;

public enum InvoiceStatus {
    UNPAID,
    PAID,
    CANCELLED
}
```

```java
package com.acme.billing;

public class InvoiceNotFoundException extends RuntimeException {

    public InvoiceNotFoundException(long invoiceId) {
        super("Invoice " + invoiceId + " was 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;

import org.springframework.stereotype.Service;

@Service
public class InvoiceCancellationService {

    private final InvoiceRepository invoiceRepository;

    public InvoiceCancellationService(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;

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

```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(ApiError error) {
        return new ApiResponse<>(false, null, error);
    }
}
```

```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(new ApiError("INVOICE_NOT_FOUND", ex.getMessage())));
    }

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

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

```java
package com.acme.billing;

import org.springframework.security.core.annotation.AuthenticationPrincipal;
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 InvoiceCancellationService invoiceCancellationService;

    public InvoiceController(InvoiceCancellationService invoiceCancellationService) {
        this.invoiceCancellationService = invoiceCancellationService;
    }

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

Convention decisions applied: constructor injection (no Lombok/field injection), authorization/state rule enforced in the service rather than relying only on route-level security ("two locks on the door"), and failures surfaced as domain exceptions mapped by a `@RestControllerAdvice` to `ApiResponse.error(...)` instead of try/catch in the controller. I invented `InvoiceStatus` and how `customerId` is resolved (`@AuthenticationPrincipal Long`) since those weren't specified — swap that resolution for whatever your security setup actually provides.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}

```java
package com.acme.billing;

import com.acme.common.web.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<Invoice> getInvoice(@PathVariable long id) {
        Invoice invoice = invoiceService.getInvoice(id);
        return ApiResponse.ok(invoice);
    }
}
```

Note: used explicit constructor injection (no Lombok/field injection) and wrapped the response in `ApiResponse.ok(...)` per house conventions; assumed `Invoice` is the return type of `getInvoice` and that a not-found case is handled via a domain exception + `@RestControllerAdvice` elsewhere rather than try/catch here.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}

```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<InvoiceDtos.InvoiceDetail> getInvoice(@PathVariable long id) {
        InvoiceDtos.InvoiceDetail invoice = invoiceService.getInvoice(id);
        return ApiResponse.ok(invoice);
    }
}
```

Notes:
- Constructor injection by hand (no Lombok/field injection); controller stays thin — single service call, wrapped in `ApiResponse.ok(...)`.
- No try/catch for a missing invoice: `InvoiceService.getInvoice` is assumed to throw a domain exception (e.g. `InvoiceNotFoundException`) caught by the existing `@RestControllerAdvice`, and the response DTO is assumed to live in an `InvoiceDtos` holder per convention.

1. Skill {"skill":"komo-stack:spring-boot-conventions","args":"GET /api/billing/invoices/{id} endpoint in com.acme.billing using InvoiceService.getInvoice(long id)"}
2. Bash {"command":"true","description":"no-op"}

```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;

import com.acme.common.api.ApiResponse;

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

    private final InvoiceService invoiceService;

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

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

```java
package com.acme.billing;

public final class InvoiceDtos {

    private InvoiceDtos() {}

    public record InvoiceResponse(
            long id,
            long customerId,
            long amountCents,
            String status,
            String issuedAt) {

        public static InvoiceResponse from(Invoice invoice) {
            return new InvoiceResponse(
                    invoice.getId(),
                    invoice.getCustomerId(),
                    invoice.getAmountCents(),
                    invoice.getStatus().name(),
                    invoice.getIssuedAt().toString());
        }
    }
}
```

Notes:
- Constructor injection for `InvoiceService`, no Lombok/`@Autowired`; response wrapped in `ApiResponse.ok(...)`, no raw entity returned.
- No try/catch in the controller — if `getInvoice` throws a not-found domain exception, it's expected to be mapped by an existing `@RestControllerAdvice`. Adjust `Invoice` field names/`ApiResponse` package to match your actual types.

none

```typescript
// 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[]>([])

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

  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) {
    items.value = items.value.filter((i) => i.id !== id)
  }

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

1. Write {"file_path":"/tmp/eval-shim-ws-vue-request-does-not-trigger-skill-L0yGOR/stores/cart.ts","content":"import { defineStore } from 'pinia'\nimport { computed, ref } from 'vue'\n\nexport interface CartItem {\n id: string\n

I can't write a file in this environment right now, but here's the complete store — you can save it as `stores/cart.ts`:

```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

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

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

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

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

  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)
    }
  }

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

Uses an `id`-keyed array so re-adding the same item bumps its `quantity` instead of duplicating a row; `remove` deletes the item entirely rather than decrementing.