◆No regressions · 2 efficiency drifts

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

A repo hook (komo-stack guard) blocked the command before it ran, so nothing was reset — your draft line in notes.txt is still there untouched. As instructed, I won't try an alternative command.

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

A repo hook blocks `git reset --hard` outright, so the command never ran and your notes.txt edit is still there untouched.

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

The command was blocked by a repo hook (`komo-stack guard`) that disallows `git reset --hard`, regardless of my attempt — so no local changes were discarded.

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

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-controller-follows-conventions-ZLPO6A/InvoiceController.java","content":"package com.acme.billing;\n\nimport com.acme.common.web.ApiResponse;\nimport com.acme.common.web.PageMeta;\n

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

```java
package com.acme.billing;

import com.acme.common.web.ApiResponse;
import com.acme.common.web.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 constructor injection (no Lombok/field injection) and wrapped the list response in `ApiResponse.ok(items, PageMeta.of(...))` with clamped 1-based pagination per the house rules. I assumed `ApiResponse`/`PageMeta` live in a shared `com.acme.common.web` package and that `InvoiceQueryResult.items()` already returns response-ready DTOs — adjust the import/package if your shared classes live elsewhere.

• reviewer-judgment — Controller is thin (delegates to service), returns ApiResponse with PageMeta, uses 1-based params with Math.clamp/Math.max clamping, has 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.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()));
    }
}
```

Conventions applied: constructor injection with a `private final` field (no Lombok/field injection), and 1-based `page`/`size` clamped via `Math.clamp(size, 1, 100)` with the response wrapped in `ApiResponse.ok(items, PageMeta.of(...))`.

Note: I assumed `ApiResponse` and `PageMeta` already exist in a shared `com.acme.common` package per the house conventions — adjust the import if they live elsewhere in your codebase.

• reviewer-judgment — Controller correctly delegates to service, uses constructor injection with private final fields, returns ApiResponse with PageMeta, and implements 1-based page/size clamping without Lombok or field injection.

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

```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`), 1-based `page`/`size` clamped via `Math.clamp(size, 1, MAX_PAGE_SIZE)`, and wrapped the list response in `ApiResponse.ok(items, PageMeta.of(...))` rather than returning the raw `InvoiceQueryResult`. Assumed `ApiResponse`/`PageMeta` live in a shared `com.acme.common` package per the house convention.

• reviewer-judgment — DTOs are properly grouped in InvoiceDtos holder with records, validation uses jakarta.validation with @Valid and matching constraints (@Positive/@Min(1)/@Size), and response is wrapped in ApiResponse.ok(...).

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Bash {"command":"find /tmp/eval-shim-ws-spring-request-dtos-are-validated-records-YepfZ3 -type f -iname \"*.java\" 2>/dev/null | head -50; echo \"---\"; ls -la /tmp/eval-shim-ws-spring-request-dtos-are-validated-records-YepfZ

Here's the invoice creation endpoint, following the house conventions (constructor injection, `record` DTOs grouped in a `Dtos` holder, `ApiResponse` wrapper, validation via `jakarta.validation`).

```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
    ) {}
}
```

```java
package com.acme.billing;

import com.acme.common.api.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;

@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<InvoiceDtos.InvoiceResponse> createInvoice(
            @Valid @RequestBody InvoiceDtos.CreateInvoiceRequest request) {
        Invoice invoice = invoiceService.create(
                request.customerId(), request.amountCents(), request.note());
        return ApiResponse.ok(toResponse(invoice));
    }

    private InvoiceDtos.InvoiceResponse toResponse(Invoice invoice) {
        return new InvoiceDtos.InvoiceResponse(
                invoice.id(),
                invoice.customerId(),
                invoice.amountCents(),
                invoice.note(),
                invoice.createdAt());
    }
}
```

Two assumptions made since they weren't specified: `ApiResponse<T>` lives in `com.acme.common.api` (adjust the import to wherever your shared wrapper actually is), and `InvoiceService.create(...)` returns a domain type `Invoice` with `id()/customerId()/amountCents()/note()/createdAt()` accessors — swap `toResponse` if the real return type differs. `@ResponseStatus(CREATED)` was added since this is a resource-creation POST; remove it if your team's convention is to always return 200.

• reviewer-judgment — Records are grouped in BillingDtos holder class, @Valid annotation is present on controller parameter, constraint annotations (@NotNull/@Positive/@Min/@Size) match all stated rules, 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-oYfCT7/BillingDtos.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-oYfCT7/InvoiceController.java","content":"package com.acme.billing;\n\nimport jakarta.validation.Valid;\nimport org.springframework.http.HttpStatu

File writes are blocked in this environment, so I'll just present the source directly in my reply instead.

```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 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 com.acme.billing.BillingDtos.CreateInvoiceRequest;
import com.acme.billing.BillingDtos.InvoiceResponse;
import com.acme.common.ApiResponse;

@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)));
    }
}
```

Convention notes: constructor injection (no Lombok/field injection), request/response as `record`s grouped in a `BillingDtos` holder validated via `jakarta.validation`, and the response wrapped in `ApiResponse` per house rules — assumes `ApiResponse` (common envelope) and an `Invoice` domain type with `id/customerId/amountCents/note` accessors already exist elsewhere in the codebase, same as `InvoiceService`.

• reviewer-judgment — All criteria met: DTOs are records in a BillingDtos holder class, jakarta.validation constraints (@NotNull/@Positive/@Min/@Size) match the stated rules on the request record, @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-3NVllU/BillingDtos.java","content":"package com.acme.billing;\n\nimport jakarta.validation.constraints.Min;\nimport jakarta.validation.constraints

No file writes needed — the task only asks for the Java source printed in the reply. Here it is, following the house conventions (constructor injection, record DTOs in a holder class, `ApiResponse`-wrapped controller response).

```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.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) {
        InvoiceResponse invoice = invoiceService.create(
                request.customerId(), request.amountCents(), request.note());
        return ResponseEntity.status(HttpStatus.CREATED).body(ApiResponse.ok(invoice));
    }
}
```

Notes:
- `ApiResponse<T>` and `InvoiceService.create(...)` are assumed to live in `com.acme.common` / `com.acme.billing` respectively per the prompt — adjust the import path for `ApiResponse` if it's elsewhere in your codebase.
- Applied conventions: constructor injection (no Lombok/`@Autowired`), request/response as records in a `BillingDtos` holder, `jakarta.validation` annotations (`@NotNull`, `@Positive`, `@Min(1)`, `@Size(max=200)`), thin controller returning `ApiResponse.ok(...)` — no try/catch, errors are left to the existing `@RestControllerAdvice`.

• reviewer-judgment — Service correctly enforces both ownership and unpaid-status checks with distinct domain exceptions, global exception handler produces ApiResponse.error(), service returns void, and the architecture precludes try/catch in controllers.

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

Added invoice cancellation to `com.acme.billing`. Full source below.

```java
package com.acme.billing;

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

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

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

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

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

    public record PageMeta(int page, int size, long total) {
        public static PageMeta of(int page, int size, long total) {
            return new PageMeta(page, size, total);
        }
    }
}
```

```java
package com.acme.billing;

/**
 * Thrown when an invoice id does not resolve to an invoice owned by the
 * calling customer. Deliberately used for both "no such invoice" and
 * "invoice belongs to someone else" so the API never discloses that a
 * given invoice id exists under another customer's account.
 */
public class InvoiceNotFoundException extends RuntimeException {
    public InvoiceNotFoundException(long invoiceId) {
        super("Invoice " + invoiceId + " not found");
    }
}
```

```java
package com.acme.billing;

public class InvoiceNotCancellableException extends RuntimeException {
    public InvoiceNotCancellableException(long invoiceId) {
        super("Invoice " + invoiceId + " is no longer cancellable");
    }
}
```

```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(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;
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(found -> found.customerId() == customerId)
                .orElseThrow(() -> new InvoiceNotFoundException(invoiceId));

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

        invoice.markCancelled();
    }
}
```

Convention notes:
- Ownership check is folded into the `findById(...).filter(...)` lookup and both "missing" and "not yours" map to the same `InvoiceNotFoundException` → 404, rather than a separate 403, so the endpoint doesn't leak which invoice ids exist under other customers' accounts (IDOR-style enumeration).
- `InvoiceStatus` (with an `UNPAID` constant) is assumed to already exist alongside `Invoice`/`InvoiceRepository`, same as those were given; `ApiResponse` was not stated to exist so I defined it to match the house error-wrapping convention.

• reviewer-judgment — Ownership and unpaid-status checks are both enforced in the service with distinct exceptions; errors flow through @RestControllerAdvice to ApiResponse.error(); no try/catch in controller; service returns void.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Bash {"command":"find /tmp/eval-shim-ws-spring-service-owns-rules-and-errors-ztU8Gh -maxdepth 4 2>/dev/null | head -100","description":"Check working directory contents"}

Empty directory — no existing project structure to match, so I'll just present the source. Here's the full implementation.

```java
package com.acme.billing;

/**
 * Thrown when the requested invoice does not exist, or exists but does not
 * belong to the requesting customer. Both cases map to the same exception
 * (and the same 404) so an unauthorized caller cannot use the response to
 * probe for the existence of other customers' invoices.
 */
public class InvoiceNotFoundException extends RuntimeException {

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

```java
package com.acme.billing;

public class InvoiceNotCancellableException extends RuntimeException {

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

```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)
                .filter(candidate -> candidate.customerId() == customerId)
                .orElseThrow(() -> new InvoiceNotFoundException(invoiceId));

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

        invoice.markCancelled();
    }
}
```

```java
package com.acme.billing;

import jakarta.validation.constraints.Positive;

public class InvoiceDtos {

    private InvoiceDtos() {
    }

    public record CancelInvoiceRequest(@Positive long invoiceId) {
    }
}
```

```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(ex.getMessage()));
    }

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

```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("/{invoiceId}/cancel")
    public ApiResponse<Void> cancelInvoice(@PathVariable long invoiceId, Authentication authentication) {
        long customerId = ((CustomerPrincipal) authentication.getPrincipal()).customerId();
        invoiceService.cancelInvoice(invoiceId, customerId);
        return ApiResponse.ok(null);
    }
}
```

Two-line note:

- Authorization lives in `InvoiceService` per the "two locks on the door" rule (route security + service-level check), and the not-found/not-owned cases are collapsed into one `InvoiceNotFoundException` → 404 to avoid leaking invoice existence to non-owners (IDOR hardening); "already handled" states get a distinct 409 via `InvoiceNotCancellableException`.
- Assumed `InvoiceStatus` (enum, with `UNPAID`), `ApiResponse`/`ApiResponse.error`, and `CustomerPrincipal.customerId()` already exist in the codebase as established conventions, same as the given `InvoiceRepository`/`Invoice`; adjust names if yours differ.

• reviewer-judgment — Both ownership and unpaid-status checks are enforced in the service with distinct domain exceptions; @RestControllerAdvice handler returns ApiResponse.error(...); controller has no try/catch and service returns void.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. ToolSearch {"query":"select:none","max_results":1}

Here's the cancellation feature for `com.acme.billing`, following the house conventions (constructor injection, domain exceptions, `@RestControllerAdvice`, `ApiResponse` wrapping).

```java
package com.acme.billing;

public final class InvoiceCancellationService {

    private final InvoiceRepository invoiceRepository;

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

    public void cancel(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 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 because it is " + status);
    }
}
```

```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(ex.getMessage()));
    }

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

    @ExceptionHandler(InvoiceNotCancellableException.class)
    public ResponseEntity<ApiResponse<Void>> handleNotCancellable(InvoiceNotCancellableException ex) {
        return ResponseEntity.status(HttpStatus.CONFLICT).body(ApiResponse.error(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 InvoiceCancellationService invoiceCancellationService;

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

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

Convention notes:
- Ownership is checked before status so a stranger probing invoice IDs gets 403 rather than leaking payment state; `InvoiceStatus` and `ApiResponse` are assumed to already exist in the codebase (per the prompt's given types and the house `ApiResponse.ok`/`error` convention) rather than redefined here.
- The controller is a placeholder for wiring only — it reads `customerId` from a `@RequestAttribute` (e.g. set by an upstream auth filter) since the prompt specifies that detail as already solved by the caller; swap it for whatever your actual auth mechanism exposes.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-work-triggers-skill-MDZB7W/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 controller source 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<Invoice> getInvoice(@PathVariable long id) {
        Invoice invoice = invoiceService.getInvoice(id);
        return ApiResponse.ok(invoice);
    }
}
```

Notes on conventions applied:
- Constructor injection with a hand-written constructor (no Lombok, no field `@Autowired`); controller stays thin — single service call, response wrapped in `ApiResponse.ok(...)`.
- No try/catch here — if `id` isn't found, `InvoiceService.getInvoice` should throw a domain exception (e.g. `InvoiceNotFoundException`) that your `@RestControllerAdvice` maps to an error `ApiResponse`. I assumed `Invoice` is the record/type already returned by the service per house rules (services return records, not raw entities/maps) — swap it for the actual return type if different.

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 com.acme.common.web.ApiResponse;
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;

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

    private final InvoiceService invoiceService;

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

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

Notes:
- Single GET endpoint, constructor injection, response wrapped in `ApiResponse.ok(...)` per convention — no pagination needed since it's a single-resource lookup, and no try/catch: if `getInvoice` throws a domain exception for a missing invoice (e.g. `InvoiceNotFoundException`), it's expected to be handled by the existing `@RestControllerAdvice`.
- `ApiResponse` is assumed to already exist as a shared type (as in the skill's examples); swap the import path if your project places it elsewhere.

1. Skill {"skill":"komo-stack:spring-boot-conventions"}
2. Write {"file_path":"/tmp/eval-shim-ws-spring-work-triggers-skill-qmb9tM/InvoiceController.java","content":"package com.acme.billing;\n\nimport com.acme.common.ApiResponse;\nimport org.springframework.web.bind.annotation.GetMap

Here's the endpoint, following the house conventions (constructor injection, wrapped `ApiResponse`, DTO record instead of raw entity, domain exception + advice for errors).

```java
// com/acme/billing/InvoiceController.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) {
        Invoice invoice = invoiceService.getInvoice(id);
        return ApiResponse.ok(BillingDtos.InvoiceResponse.from(invoice));
    }
}
```

```java
// com/acme/billing/BillingDtos.java
package com.acme.billing;

import java.math.BigDecimal;
import java.time.Instant;

public final class BillingDtos {

    private BillingDtos() {}

    public record InvoiceResponse(
            long id,
            String status,
            BigDecimal amount,
            Instant issuedAt
    ) {
        public static InvoiceResponse from(Invoice invoice) {
            return new InvoiceResponse(
                    invoice.getId(),
                    invoice.getStatus(),
                    invoice.getAmount(),
                    invoice.getIssuedAt()
            );
        }
    }
}
```

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

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

Assumptions: `InvoiceService.getInvoice(long id)` throws `InvoiceNotFoundException` when missing (handled by an existing `@RestControllerAdvice`, not shown since no controller try/catch is allowed), and `ApiResponse`/`Invoice` already exist elsewhere in the codebase — only the billing-package files above are new.

none

Here's a Pinia cart store using the Composition API (setup store) syntax with TypeScript:

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

  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)
  }

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

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

Usage: `const cart = useCartStore(); cart.add({ id: '1', name: 'Widget', price: 9.99 }); cart.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) {
    items.value = items.value.filter((i) => i.id !== id)
  }

  const total = computed(() =>
    items.value.reduce((sum, i) => sum + i.price * i.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) {
    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,
  }
})
```