# Dice roller

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

## Tool capabilities

| Property | Value |
| --- | --- |
| Tool ID | `dice-roller` |
| Category | calculators |
| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |
| Browser execution | Use the visible action or interactive controls. |
| Browser processing | Browser; see tool notes for network behavior. |
| HTTP API | /api/v1/tools/dice-roller/run |
| Browser-agent interface | run_current_tool |

### Inputs and settings

No free-text input is required. Use the file inputs and/or settings below.

| Setting | Meaning | Control type | Default | Constraints |
| --- | --- | --- | --- | --- |
| `sides` | Sides | number | 6 |  |
| `n` | Dice | number | 2 |  |

### HTTP contract

API calls process supplied data on the server. The website origin is `https://happytails.ai`. Server API hosting is not connected on the public website yet. Use your local server origin to test these requests.

```http
POST https://happytails.ai/api/v1/tools/dice-roller/run
Content-Type: application/json
```

[Detailed operation reference](https://happytails.ai/en/api/tools/dice-roller.md) · [Shared API guide](https://happytails.ai/en/api.md)

#### Limits

| Limit | Value |
| --- | --- |
| request_bytes | 8388608 |
| input_characters | 1000000 |
| files_bytes | 5242880 |
| max_files | 0 |
| timeout_seconds | 12 |

#### Complete input schema

```json
{
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "input": {
      "type": "string",
      "maxLength": 1000000,
      "default": "",
      "description": "Plain text input. File tools use files instead unless otherwise documented."
    },
    "options": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "sides": {
          "type": "number",
          "description": "Sides",
          "default": 6.0
        },
        "n": {
          "type": "number",
          "description": "Dice",
          "default": 2.0
        }
      }
    }
  }
}
```

#### Complete output schema

```json
{
  "type": "object",
  "required": [
    "tool",
    "result"
  ],
  "properties": {
    "tool": {
      "type": "string"
    },
    "result": {
      "type": "object",
      "required": [
        "text",
        "files"
      ],
      "properties": {
        "text": {
          "type": [
            "string",
            "null"
          ]
        },
        "data": {
          "description": "Parsed JSON when the textual result is JSON."
        },
        "name": {
          "type": "string"
        },
        "mime": {
          "type": "string"
        },
        "files": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "name",
              "mime",
              "bytes",
              "base64"
            ],
            "properties": {
              "name": {
                "type": "string"
              },
              "mime": {
                "type": "string"
              },
              "bytes": {
                "type": "integer"
              },
              "base64": {
                "type": "string",
                "contentEncoding": "base64"
              }
            }
          }
        }
      }
    }
  }
}
```

#### Error and retry handling

Failures return a non-200 status and `error.code` plus `error.message`. Correct invalid input before retrying; retry server-busy responses with bounded backoff. Returned files contain Base64 data, not persistent download URLs. Decode and inspect the output before treating conversion as successful. See the shared API guide for the complete status and timeout rules.

### 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

Dice count/sides and readable results; uniform random outcomes.

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

### Complete machine-readable capability record

```json
{
  "id": "dice-roller",
  "category": "calculators",
  "built": true,
  "requirements": "Dice count/sides and readable results; uniform random outcomes.",
  "implementation": {
    "fields": [
      {
        "key": "sides",
        "label": "Sides",
        "value": 6,
        "type": "number"
      },
      {
        "key": "n",
        "label": "Dice",
        "value": 2,
        "type": "number"
      }
    ],
    "input": false,
    "note": "",
    "live": false,
    "presentation": "metrics",
    "experience": {
      "automatic": false,
      "single": false,
      "label": "Your text",
      "placeholder": "Type or paste your input…",
      "help": "Up to 1,000,000 characters. Review the settings before running.",
      "action": null
    },
    "mode": "explicit",
    "interactive": false
  },
  "execution": "POST /api/v1/tools/dice-roller/run",
  "api": {
    "id": "dice-roller",
    "name": "Dice roller",
    "category": "calculators",
    "description": "Roll virtual dice and see each roll and the total.",
    "notes": "",
    "human_path": "/en/calculators/dice-roller/",
    "method": "POST",
    "endpoint": "/api/v1/tools/dice-roller/run",
    "schema_url": "/api/v1/tools/dice-roller",
    "input_schema": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "input": {
          "type": "string",
          "maxLength": 1000000,
          "default": "",
          "description": "Plain text input. File tools use files instead unless otherwise documented."
        },
        "options": {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "sides": {
              "type": "number",
              "description": "Sides",
              "default": 6.0
            },
            "n": {
              "type": "number",
              "description": "Dice",
              "default": 2.0
            }
          }
        }
      }
    },
    "output_schema": {
      "type": "object",
      "required": [
        "tool",
        "result"
      ],
      "properties": {
        "tool": {
          "type": "string"
        },
        "result": {
          "type": "object",
          "required": [
            "text",
            "files"
          ],
          "properties": {
            "text": {
              "type": [
                "string",
                "null"
              ]
            },
            "data": {
              "description": "Parsed JSON when the textual result is JSON."
            },
            "name": {
              "type": "string"
            },
            "mime": {
              "type": "string"
            },
            "files": {
              "type": "array",
              "items": {
                "type": "object",
                "required": [
                  "name",
                  "mime",
                  "bytes",
                  "base64"
                ],
                "properties": {
                  "name": {
                    "type": "string"
                  },
                  "mime": {
                    "type": "string"
                  },
                  "bytes": {
                    "type": "integer"
                  },
                  "base64": {
                    "type": "string",
                    "contentEncoding": "base64"
                  }
                }
              }
            }
          }
        }
      }
    },
    "processing": "Server; same transformation code as browser tools",
    "limits": {
      "request_bytes": 8388608,
      "input_characters": 1000000,
      "files_bytes": 5242880,
      "max_files": 0,
      "timeout_seconds": 12
    }
  },
  "agent_processing": "Server; same transformation code as browser tools",
  "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

Roll virtual dice and see each roll and the total.

## How to use Dice roller

1. Enter the values you want to calculate and choose the relevant units or settings.
2. Review the settings, then choose Run Dice roller.
3. Review the result, then use Copy result or a download link when available.

## What to expect

Roll virtual dice and see each roll and the total. Choose the number of sides and dice. Each die produces a whole number from 1 to the selected number of sides.

## Useful next steps

- [Random number](https://happytails.ai/en/calculators/random-number/): Generate random whole numbers within an inclusive range. ([Markdown](https://happytails.ai/en/calculators/random-number.md))

- [Coin flip](https://happytails.ai/en/calculators/coin-flip/): Flip a virtual coin and get Heads or Tails. ([Markdown](https://happytails.ai/en/calculators/coin-flip.md))