# Walkthrough: Idempotent Deletion Feedback Fix

I have implemented a "Check-before-Delete" pattern across the core services to ensure that deletion tools provide accurate feedback to the user.

## Changes Made

### Services
- **`TestLayerService`**: 
    - Updated `delete_test_layer` and `delete_test_layer_schema` to check for existence using `get` methods before proceeding with deletion.
    - Fixed exception handling in `get` methods to ensure `AllureNotFoundError` is correctly propagated (avoiding it being swallowed and re-raised as a generic `AllureAPIError`).
- **`SharedStepService`**:
    - Updated `delete_shared_step` to return a `bool` (True if deleted, False if already gone).
    - Updated `get_shared_step` to correctly propagate `Allure` exceptions.
    - Added missing `AllureNotFoundError` import.

### Tools
- **`delete_shared_step`**: Updated to handle the boolean response and provide standardized messaging.
- **`delete_test_layer`** & **`delete_test_layer_schema`**: Standardized success/info messages for better user experience.

| Entity | Success Message | Already Deleted Message |
|--------|-----------------|-------------------------|
| **Test Layer** | ✅ Test layer {id} deleted successfully! | ℹ️ Test layer {id} was already deleted or doesn't exist. |
| **Test Layer Schema** | ✅ Test layer schema {id} deleted successfully! | ℹ️ Test layer schema {id} was already deleted or doesn't exist. |
| **Shared Step** | ✅ Archived Shared Step {id} | ℹ️ Shared Step {id} was already archived or doesn't exist. |

## Verification Results

### Automated Tests
Updated and ran unit tests for `TestLayerService` and `SharedStepService`. All tests passed, confirming the new "Check then Act" logic.

```bash
uv run --env-file .env.test pytest tests/unit/test_test_layer_service.py tests/unit/test_shared_step_service.py
```

### E2E Tests
Fixed the failing `tests/e2e/test_manage_custom_fields.py::test_manage_custom_fields_lifecycle` test. The failure was due to an order mismatch in multi-value custom field assertions. I updated the test to compare sorted lists of values.

```bash
uv run --env-file .env.test pytest -vv -s tests/e2e/test_manage_custom_fields.py::test_manage_custom_fields_lifecycle
```

**Results:**
- `tests/unit/test_test_layer_service.py`: 18 tests passed.
- `tests/unit/test_shared_step_service.py`: 9 tests passed.

### Manual Verification
The tools were verified to return consistent messages based on whether the entity existed or not (simulated via unit test mocks and verified by standardizing tool output).
