| name | use-case-specification |
| description | Creates use case specifications with structured scenarios and business rules. |
Use Case Specification Writer
Instructions
Create or update use case specification documents in docs/use_cases/. Each use case describes a complete interaction
between an actor and the system to achieve a goal.
DO NOT
- Write vague or incomplete scenarios
- Skip numbering steps in the Main Success Scenario
- Omit alternative flows for error conditions
- Leave postconditions undefined
- Mix multiple use cases in one document
- Use technical implementation details in the flow steps
Template
Use templates/use-case.md as the document structure.
Example Use Case
Use Case: Create Reservation
Overview
Use Case ID: UC-001 Use Case Name: Create Reservation Primary Actor: Front Desk Clerk Goal: Create a new room reservation for a guest Status: Approved
Preconditions
- Clerk is logged into the system
- At least one room type is available for the requested dates
Main Success Scenario
- Clerk selects "New Reservation" from the menu.
- System displays the reservation form.
- Clerk enters guest information (name, email, phone).
- Clerk selects check-in and check-out dates.
- System displays available room types for the selected dates.
- Clerk selects a room type.
- System calculates the total price.
- Clerk confirms the reservation.
- System creates the reservation and displays a confirmation number.
Alternative Flows
A1: Guest Already Exists
Trigger: Guest email matches existing record (step 3) Flow:
- System displays existing guest information.
- Clerk confirms or updates guest details.
- Use case continues at step 4.
A2: No Rooms Available
Trigger: No rooms available for selected dates (step 5) Flow:
- System displays "No availability" message.
- Clerk adjusts dates or cancels operation.
- Use case continues at step 4 or ends.
A3: Payment Required
Trigger: Business rule requires deposit (step 8) Flow:
- System prompts for payment information.
- Clerk enters payment details.
- System processes payment.
- Use case continues at step 9.
Postconditions
Success Postconditions
- Reservation is stored in the system with status "Confirmed"
- Room availability is updated for the reserved dates
- Confirmation email is sent to the guest
Failure Postconditions
- No reservation is created
- Room availability remains unchanged
- System displays error message to clerk
Business Rules
BR-001: Minimum Stay
Reservations must be for at least one night.
BR-002: Advance Booking Limit
Reservations cannot be made more than 365 days in advance.
BR-003: Deposit Requirement
Reservations of 3 or more nights require a 50% deposit.
Status Reference
| Status | Description |
|---|---|
| Draft | Initial version, still being written. |
| Review | Complete, awaiting stakeholder review. |
| Approved | Reviewed and approved for implementation. |
| Obsolete | No longer valid, superseded by another use case. |
Step Writing Guidelines
| Do | Don't |
|---|---|
| "User clicks Save button" | "User triggers onClick handler" |
| "System validates the email format" | "System runs regex /^[\w]+@[\w]+$/" |
| "System displays error message" | "System throws ValidationException" |
| "User enters check-in date" | "User populates dateField component" |
| "System stores the reservation" | "System executes INSERT INTO reservations..." |
Workflow
- Read the requirements document and use case diagram
- Identify the use case to document
- Use TodoWrite to track progress
- Write the Overview section with actor and goal
- Define preconditions (what must be true before starting)
- Write the Main Success Scenario step by step
- Identify alternative flows:
- Error conditions
- Optional paths
- Exceptional situations
- Define postconditions for both success and failure
- Document applicable business rules
- Review for completeness and clarity
- Mark todo complete