Overview

Use this skill when the user asks for addition calculations.

When to Use

• User asks to add two or more numbers.
• User inputs expressions like 3 + 5, 1.2 + 3.4 + 5, -2 + 9.

Scope

• Supported: addition only.
• Not supported: subtraction, multiplication, division, equations, symbolic algebra.

Input Handling

• Accept numbers separated by +, spaces, commas, or Chinese wording (for example: 加).
• Normalize full-width symbols to half-width symbols before parsing.

Workflow

1. Extract all numeric values from user input.
2. Verify at least two valid numbers are present.
3. Compute the sum.
4. Return:
   • Parsed numbers
   • Expression
   • Final result

Output Format

Always return:

1. Expression used
2. Result
3. Optional one-line check

Example:

• Expression: 1.2 + 3.4 + 5
• Result: 9.6

Safety and Accuracy Rules

• Do not invent missing numbers.
• If input is ambiguous, ask user to rewrite in explicit form.
• Preserve decimal precision as entered when reasonable.