# io8 Business Analyst Agent - Customized for This Project

## Project-Specific Instructions


## Analysis Document Update - 2025-09-25 07:45:00

This section updates the analysis based on the user prompt: 'calculator app' and the provided coder breakdown and plan.

### Project Overview Update

The project aims to develop a simple calculator application. The application will perform basic arithmetic operations (addition, subtraction, multiplication, division). The design will prioritize simplicity and ease of use. The project will leverage the existing base project structure and tools to minimize development time and effort.  It will adhere to the append-only constraint and build upon the existing base project files.

### User Requirements Update

Based on the user prompt, the core user requirement is a functional calculator application capable of performing basic arithmetic operations. Additional requirements may emerge during the design and development phases, but the core requirement remains straightforward and well-defined.  Further refinement may be needed to specify the types of calculations supported, error handling, or UI/UX considerations.

### Functional Requirements Update

* FR-001: Perform Addition
    * Description: The calculator should accurately add two numbers. 
    * Acceptance Criteria: The calculator should correctly return the sum of two valid numerical inputs.
    * Priority: High
* FR-002: Perform Subtraction
    * Description: The calculator should accurately subtract two numbers.
    * Acceptance Criteria: The calculator should correctly return the difference of two valid numerical inputs.
    * Priority: High
* FR-003: Perform Multiplication
    * Description: The calculator should accurately multiply two numbers.
    * Acceptance Criteria: The calculator should correctly return the product of two valid numerical inputs.
    * Priority: High
* FR-004: Perform Division
    * Description: The calculator should accurately divide two numbers.
    * Acceptance Criteria: The calculator should correctly return the quotient of two valid numerical inputs.  It should handle division by zero gracefully (e.g., display an error message).
    * Priority: High
* FR-005: Handle Invalid Input
    * Description: The calculator should gracefully handle invalid input, such as non-numerical characters.
    * Acceptance Criteria: The calculator should display an appropriate error message for invalid input and prevent calculation errors.
    * Priority: Medium
* FR-006: Display Results
    * Description: The calculator should clearly display the results of calculations.
    * Acceptance Criteria: The result of a calculation should be displayed prominently in a designated area of the user interface.
    * Priority: High

### Non-Functional Requirements Update

* NFR-001: Usability: The calculator should have an intuitive and user-friendly interface.
* NFR-002: Performance: The calculator should respond quickly to user input and calculations.
* NFR-003: Reliability: The calculator should consistently perform accurate calculations.
* NFR-004: Maintainability: The codebase should be well-structured and easy to maintain.

### User Stories Update

* As a user, I want to add two numbers so I can get their sum.
* As a user, I want to subtract two numbers so I can get their difference.
* As a user, I want to multiply two numbers so I can get their product.
* As a user, I want to divide two numbers so I can get their quotient.
* As a user, I want to be informed if I enter invalid input so I can correct my mistakes.
* As a user, I want the results to be clearly displayed so I can easily see the outcome of my calculations.

### Business Rules Update

* The calculator should only perform basic arithmetic operations (addition, subtraction, multiplication, division).
* The calculator must handle division by zero gracefully, displaying an error message to the user.
* The calculator should validate user input to prevent errors and ensure only numerical values are processed.



## Requirements Document Update - 2025-09-25 07:45:00

This section updates the requirements document based on the user prompt and the analysis above.

### FR-001: Perform Addition
- **Description:** The calculator shall accurately perform addition of two or more numerical inputs.
- **Acceptance Criteria:** Given two or more valid numerical inputs, the calculator shall correctly display their sum.  The result shall be accurate to at least 10 decimal places.
- **Priority:** High

### FR-002: Perform Subtraction
- **Description:** The calculator shall accurately perform subtraction of two numerical inputs.
- **Acceptance Criteria:** Given two valid numerical inputs, the calculator shall correctly display the difference between the first and second input. The result shall be accurate to at least 10 decimal places.
- **Priority:** High

### FR-003: Perform Multiplication
- **Description:** The calculator shall accurately perform multiplication of two or more numerical inputs.
- **Acceptance Criteria:** Given two or more valid numerical inputs, the calculator shall correctly display their product. The result shall be accurate to at least 10 decimal places.
- **Priority:** High

### FR-004: Perform Division
- **Description:** The calculator shall accurately perform division of two numerical inputs.
- **Acceptance Criteria:** Given two valid numerical inputs, where the second input is not zero, the calculator shall correctly display the quotient of the first input divided by the second input. The result shall be accurate to at least 10 decimal places. If the second input is zero, the calculator shall display an appropriate error message, such as "Division by zero is not allowed."
- **Priority:** High

### FR-005: Handle Invalid Input
- **Description:** The calculator shall handle invalid input gracefully and inform the user.
- **Acceptance Criteria:** When the user inputs non-numerical characters or attempts operations that are not supported (e.g., division by zero), the calculator shall display a clear error message indicating the type of error.  The calculator shall not crash.
- **Priority:** Medium

### FR-006: Clear Display
- **Description:** The calculator shall provide a clear and easy-to-read display of results.
- **Acceptance Criteria:** The results of all calculations shall be clearly displayed in a designated area of the user interface, using a suitable font size and formatting. The displayed number shall be limited to 15 characters. Longer results shall be appropriately truncated.
- **Priority:** High

### NFR-001:  Usability
- **Description:** The user interface shall be intuitive and easy to use.
- **Acceptance Criteria:** The UI shall be simple, straightforward, and easy to navigate.
- **Priority:** High

### NFR-002: Performance
- **Description:** The calculator shall provide quick and responsive calculations.
- **Acceptance Criteria:** Calculations should be performed and displayed within 1 second of user input.
- **Priority:** High

### NFR-003: Reliability
- **Description:** The calculator shall consistently provide accurate results.
- **Acceptance Criteria:** The calculator shall provide accurate results for all valid input across multiple test runs.
- **Priority:** High


## Base Agent Prompt Reference

This agent is based on the standard io8analyst agent with project-specific customizations above.
Refer to the base io8analyst agent prompt for general principles and workflow instructions.
