Create CALCULATOR.md

Author: mythz

llms/extensions/core_tools/CALCULATOR.md

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+# Calculator
+
+A powerful and safe mathematical expression evaluator with a rich web interface.
+
+## Features
+
+### 🖥️ UX Friendly Interface
+Experience a clean, modern interface designed for efficiency. The UI is fully responsive and supports dark mode, seamlessly integrating with the rest of the application.
+
+### 💾 Persistent History
+Never lose track of your calculations. The Calculator automatically saves your history to `localStorage`, ensuring your previous expressions and results are preserved between sessions.
+
+### ⚡ 1-Click Interaction
+Streamline your workflow with interactive history items:
+- **Load & Copy**: Click on any past expression or answer to instantly load it into the input field and copy it to your clipboard.
+- **Visual Feedback**: Temporary checkmarks confirm successful copy actions.
+
+### ⌨️ Keyboard-Free Access
+While full keyboard support is available, you can perform complex calculations entirely via the UI:
+- **Numbers & Constants**: Quick access to digits and mathematical constants like `pi`, `e`, `inf`.
+- **Operators**: Comprehensive set of buttons for arithmetic (`+`, `-`, `*`, `/`, `%`, `^`) and boolean logic (`and`, `or`, `not`).
+- **Functions**: One-click insertion or wrapping of selection for all supported math functions.
+
+### 🐍 Python Math Support
+Unlock the power of Python's math library directly in the browser.
+- **Math Functions**: Support for `sin`, `cos`, `tan`, `sqrt`, `log`, `factorial`, and many more.
+- **Statistics**: Built-in functions for `mean`, `median`, `stdev`, and `variance`.
+
+### 🛡️ Safe Evaluation
+Security is a priority. Instead of using Python's unsafe `eval()`, the Calculator uses a robust **AST (Abstract Syntax Tree) evaluator**.
+- **Restricted Environment**: Only allowed mathematical operations and functions are executed.
+- **No Side Effects**: Prevents arbitrary code execution, making it safe to evaluate expressions from untrusted sources.