# GCF calculator

- Human page: https://happytails.ai/en/calculators/gcf-calculator/
- Markdown: https://happytails.ai/en/calculators/gcf-calculator.md
- Structured JSON: https://happytails.ai/agents/en/calculators/gcf-calculator/index.json
- Visibility: public

## Tool capabilities

| Property | Value |
| --- | --- |
| Tool ID | `gcf-calculator` |
| Category | calculators |
| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |
| Browser execution | Automatic updates after valid input or file selection. |
| Browser processing | Browser; see tool notes for network behavior. |
| HTTP API | Not callable through HTTP. |
| Browser-agent interface | run_current_tool |

### Implementation notes

Finds the greatest common factor using exact integer arithmetic. Enter up to 100 integers of at most 100 digits. Zero and negative values are accepted, but at least one value must be nonzero.

### Inputs and settings

Text input: Whole numbers.

Example or placeholder shown in the interface (not a validated fixture):

```text
48, 180
```

Separate whole numbers with commas, spaces or new lines. Results update as you type. Up to 1,000,000 characters.

No additional settings are declared for this tool.

### Browser-agent workflow

1. Open the human page in a browser that supports WebMCP.
2. Discover the interface exposed by that page; use its actual schema.
3. Select files on the page first when the tool requires files.
4. Call `run_current_tool` with valid input and settings.
5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.

Calls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.

### Planning specification

This tool uses exact integer arithmetic for up to 100 entries, each at most 100 digits. Negative values use their absolute magnitude. A list containing only zeros has no greatest positive factor.

This describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.

### Complete machine-readable capability record

```json
{
  "id": "gcf-calculator",
  "category": "calculators",
  "built": true,
  "requirements": "This tool uses exact integer arithmetic for up to 100 entries, each at most 100 digits. Negative values use their absolute magnitude. A list containing only zeros has no greatest positive factor.",
  "implementation": {
    "fields": [],
    "live": true,
    "presentation": "metrics",
    "note": "Finds the greatest common factor using exact integer arithmetic. Enter up to 100 integers of at most 100 digits. Zero and negative values are accepted, but at least one value must be nonzero.",
    "experience": {
      "automatic": true,
      "single": false,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "Whole numbers",
      "placeholder": "48, 180",
      "help": "Separate whole numbers with commas, spaces or new lines. Results update as you type. Up to 1,000,000 characters.",
      "action": null
    },
    "mode": "automatic",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}
```

## Page guide

Find the greatest common factor of a list of integers.

How can we improve this tool?

Report a problem or share an idea.

Please leave out private information. Your message and the tool name go to our team via PostHog.

### How to use GCF calculator

1. Enter whole numbers in the input field.
2. The result updates as you type. Adjust the available settings if needed.
3. Review the result, then use Copy result or a download link when available.

## Useful next steps

- [Lcm](https://happytails.ai/en/calculators/lcm/) ([Markdown](https://happytails.ai/en/calculators/lcm.md))

- [Prime factorization calculator](https://happytails.ai/en/calculators/prime-factorization/) ([Markdown](https://happytails.ai/en/calculators/prime-factorization.md))

- [Prime number checker](https://happytails.ai/en/calculators/prime-number-checker/) ([Markdown](https://happytails.ai/en/calculators/prime-number-checker.md))

## How to use it

Separate your integers with commas, spaces or new lines. The result is the largest positive integer that divides every input without a remainder.

### A worked example

The greatest common factor of 48 and 180 is 12. For -18, 24 and 0, the answer is 6.

### What to know

This tool uses exact integer arithmetic for up to 100 entries, each at most 100 digits. Negative values use their absolute magnitude. A list containing only zeros has no greatest positive factor.