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Perform deterministic arithmetic, percent-based math, and change-rate math.
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| name | calculator |
| description | Perform deterministic arithmetic, percent-based math, and change-rate math. |
| when_to_use | Use this skill when the user asks for exact arithmetic, percents, growth or decrease rates, discounts, markups, ratios, or numeric comparisons that should not be estimated mentally. |
| provider_type | builtin |
| provider_id | calculator |
| runtime_type | tool |
| tools | ["evaluate_expression","calculate","percentage"] |
| supported_callers | ["aichat","agent","workflow"] |
| max_calls_per_turn | 50 |
| timeout_seconds | 5 |
| display | {"icon":"calculator","category":"productivity","label":{"en_US":"Calculator","zh_Hans":"计算器"},"description":{"en_US":"Handles exact arithmetic, percentages, discounts, and numeric comparisons.","zh_Hans":"用于精确计算、百分比、折扣、变化率和数值比较。"},"when_to_use":{"en_US":"Use when answers require exact calculation instead of mental math.","zh_Hans":"当问题需要精确计算，而不是让模型心算时启用。"},"tags":{"en_US":["Math","Arithmetic"],"zh_Hans":["数学","精确计算"]}} |
Use this skill for exact arithmetic and percentage tasks.
call_skill_tool call with tool_name set to evaluate_expression when the task can be represented as one arithmetic expression.calculate only when a single binary operation is clearer than a full expression.percentage only when the user asks specifically for percent-of, percentage change, or applying a percentage increase/decrease and a single expression would be less clear.evaluate_expression, convert the calculation into a pure numeric expression with ASCII operators. Remove units, natural-language notes, labels, thousands separators, and non-standard operators such as × or ÷.evaluate_expression accepts:
expression: a restricted arithmetic expression using numbers, parentheses, +, -, *, /, %, and ^.precision: optional decimal places from 0 to 12.Use decimal percentages inside expressions. For example, use 0.85 for an 85 percent multiplier and 0.15 for a 15 percent decrease.
Example for a grocery total with a fixed reduction and member discount:
expression: (9.5*10 + 4.8*15 + 15*5 - 30) * 0.85precision: 2calculate accepts:
operation: add, subtract, multiply, divide, power, or mod.left: left operand.right: right operand.precision: optional decimal places from 0 to 12.percentage accepts:
operation: percent_of, change, apply_increase, or apply_decrease.value: base value for percent_of, apply_increase, and apply_decrease.percent: percentage value, for example 15 means 15 percent.from: original value for change.to: new value for change.precision: optional decimal places from 0 to 12.