{
  "title": "Number to words",
  "human_url": "https://happytails.ai/en/text-tools/number-to-words/",
  "agent_url": "https://happytails.ai/agents/en/text-tools/number-to-words/",
  "language": "en",
  "markdown_url": "https://happytails.ai/en/text-tools/number-to-words.md",
  "content": "Number to words\nWrite a whole number in English words.\nUseful next steps\nRemove duplicate lines\nRemove repeated lines while keeping their first occurrence.\nRemove extra spaces\nTidy repeated spaces without losing line breaks.\nSort lines\nSort lines alphabetically or in natural number order.\nHow to use Number to words\nEnter whole number in the input field.\nThe result updates as you type. Adjust the available settings if needed.\nReview the result, then use Copy result or a download link when available.\nWhat to expect\nWrite a whole number in English words. English whole numbers only. Decimal, currency and other-language modes are not available.\nTry a small example\n42",
  "content_format": "text/plain",
  "visibility": "public",
  "links": [
    {
      "name": "Remove duplicate lines Remove repeated lines while keeping their first occurrence.",
      "url": "https://happytails.ai/en/text-tools/remove-duplicate-lines/"
    },
    {
      "name": "Remove extra spaces Tidy repeated spaces without losing line breaks.",
      "url": "https://happytails.ai/en/text-tools/remove-extra-spaces/"
    },
    {
      "name": "Sort lines Sort lines alphabetically or in natural number order.",
      "url": "https://happytails.ai/en/text-tools/sort-lines/"
    }
  ],
  "tool": {
    "id": "number-to-words",
    "category": "text-tools",
    "built": true,
    "requirements": "Language-specific number grammar, decimal and currency modes; large integer precision.",
    "implementation": {
      "fields": [],
      "note": "English integers within the safe precision range.",
      "experience": {
        "automatic": true,
        "single": true,
        "label": "Number",
        "placeholder": "42",
        "help": "Enter the number you want written in English words. Results update as you type. Up to 1,000,000 characters.",
        "action": null
      },
      "mode": "automatic",
      "interactive": false
    },
    "execution": "POST /api/v1/tools/number-to-words/run",
    "api": {
      "id": "number-to-words",
      "name": "Number to words",
      "category": "text-tools",
      "description": "Write a whole number in English words.",
      "notes": "English integers within the safe precision range.",
      "human_path": "/en/text-tools/number-to-words/",
      "method": "POST",
      "endpoint": "/api/v1/tools/number-to-words/run",
      "schema_url": "/api/v1/tools/number-to-words",
      "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": {}
          }
        }
      },
      "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"
    }
  },
  "markdown": "# Number to words\n\n- Human page: https://happytails.ai/en/text-tools/number-to-words/\n- Markdown: https://happytails.ai/en/text-tools/number-to-words.md\n- Structured JSON: https://happytails.ai/agents/en/text-tools/number-to-words/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `number-to-words` |\n| Category | text-tools |\n| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |\n| Browser execution | Automatic updates after valid input or file selection. |\n| Browser processing | Browser; see tool notes for network behavior. |\n| HTTP API | /api/v1/tools/number-to-words/run |\n| Browser-agent interface | run_current_tool |\n\n### Implementation notes\n\nEnglish integers within the safe precision range.\n\n### Inputs and settings\n\nText input: Number.\n\nExample or placeholder shown in the interface (not a validated fixture):\n\n```text\n42\n```\n\nEnter the number you want written in English words. Results update as you type. Up to 1,000,000 characters.\n\nNo additional settings are declared for this tool.\n\n### HTTP contract\n\nAPI 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.\n\n```http\nPOST https://happytails.ai/api/v1/tools/number-to-words/run\nContent-Type: application/json\n```\n\n[Detailed operation reference](https://happytails.ai/en/api/tools/number-to-words.md) · [Shared API guide](https://happytails.ai/en/api.md)\n\n#### Limits\n\n| Limit | Value |\n| --- | --- |\n| request_bytes | 8388608 |\n| input_characters | 1000000 |\n| files_bytes | 5242880 |\n| max_files | 0 |\n| timeout_seconds | 12 |\n\n#### Complete input schema\n\n```json\n{\n  \"type\": \"object\",\n  \"additionalProperties\": false,\n  \"properties\": {\n    \"input\": {\n      \"type\": \"string\",\n      \"maxLength\": 1000000,\n      \"default\": \"\",\n      \"description\": \"Plain text input. File tools use files instead unless otherwise documented.\"\n    },\n    \"options\": {\n      \"type\": \"object\",\n      \"additionalProperties\": false,\n      \"properties\": {}\n    }\n  }\n}\n```\n\n#### Complete output schema\n\n```json\n{\n  \"type\": \"object\",\n  \"required\": [\n    \"tool\",\n    \"result\"\n  ],\n  \"properties\": {\n    \"tool\": {\n      \"type\": \"string\"\n    },\n    \"result\": {\n      \"type\": \"object\",\n      \"required\": [\n        \"text\",\n        \"files\"\n      ],\n      \"properties\": {\n        \"text\": {\n          \"type\": [\n            \"string\",\n            \"null\"\n          ]\n        },\n        \"data\": {\n          \"description\": \"Parsed JSON when the textual result is JSON.\"\n        },\n        \"name\": {\n          \"type\": \"string\"\n        },\n        \"mime\": {\n          \"type\": \"string\"\n        },\n        \"files\": {\n          \"type\": \"array\",\n          \"items\": {\n            \"type\": \"object\",\n            \"required\": [\n              \"name\",\n              \"mime\",\n              \"bytes\",\n              \"base64\"\n            ],\n            \"properties\": {\n              \"name\": {\n                \"type\": \"string\"\n              },\n              \"mime\": {\n                \"type\": \"string\"\n              },\n              \"bytes\": {\n                \"type\": \"integer\"\n              },\n              \"base64\": {\n                \"type\": \"string\",\n                \"contentEncoding\": \"base64\"\n              }\n            }\n          }\n        }\n      }\n    }\n  }\n}\n```\n\n#### Recorded request and response\n\nSaved fixture from 2026-09-28T18:13:37Z. This is historical evidence, not a new validation or a guarantee for every input.\n\n```json\n{\n  \"input\": \"42\",\n  \"options\": {}\n}\n```\n\n```json\n{\n  \"tool\": \"number-to-words\",\n  \"result\": {\n    \"text\": \"forty-two\",\n    \"files\": [],\n    \"name\": \"result.txt\",\n    \"mime\": \"text/plain;charset=utf-8\"\n  }\n}\n```\n\n#### Error and retry handling\n\nFailures 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.\n\n### Browser-agent workflow\n\n1. Open the human page in a browser that supports WebMCP.\n2. Discover the interface exposed by that page; use its actual schema.\n3. Select files on the page first when the tool requires files.\n4. Call `run_current_tool` with valid input and settings.\n5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.\n\nCalls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.\n\n### Planning specification\n\nLanguage-specific number grammar, decimal and currency modes; large integer precision.\n\nThis describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.\n\n### Complete machine-readable capability record\n\n```json\n{\n  \"id\": \"number-to-words\",\n  \"category\": \"text-tools\",\n  \"built\": true,\n  \"requirements\": \"Language-specific number grammar, decimal and currency modes; large integer precision.\",\n  \"implementation\": {\n    \"fields\": [],\n    \"note\": \"English integers within the safe precision range.\",\n    \"experience\": {\n      \"automatic\": true,\n      \"single\": true,\n      \"label\": \"Number\",\n      \"placeholder\": \"42\",\n      \"help\": \"Enter the number you want written in English words. Results update as you type. Up to 1,000,000 characters.\",\n      \"action\": null\n    },\n    \"mode\": \"automatic\",\n    \"interactive\": false\n  },\n  \"execution\": \"POST /api/v1/tools/number-to-words/run\",\n  \"api\": {\n    \"id\": \"number-to-words\",\n    \"name\": \"Number to words\",\n    \"category\": \"text-tools\",\n    \"description\": \"Write a whole number in English words.\",\n    \"notes\": \"English integers within the safe precision range.\",\n    \"human_path\": \"/en/text-tools/number-to-words/\",\n    \"method\": \"POST\",\n    \"endpoint\": \"/api/v1/tools/number-to-words/run\",\n    \"schema_url\": \"/api/v1/tools/number-to-words\",\n    \"input_schema\": {\n      \"type\": \"object\",\n      \"additionalProperties\": false,\n      \"properties\": {\n        \"input\": {\n          \"type\": \"string\",\n          \"maxLength\": 1000000,\n          \"default\": \"\",\n          \"description\": \"Plain text input. File tools use files instead unless otherwise documented.\"\n        },\n        \"options\": {\n          \"type\": \"object\",\n          \"additionalProperties\": false,\n          \"properties\": {}\n        }\n      }\n    },\n    \"output_schema\": {\n      \"type\": \"object\",\n      \"required\": [\n        \"tool\",\n        \"result\"\n      ],\n      \"properties\": {\n        \"tool\": {\n          \"type\": \"string\"\n        },\n        \"result\": {\n          \"type\": \"object\",\n          \"required\": [\n            \"text\",\n            \"files\"\n          ],\n          \"properties\": {\n            \"text\": {\n              \"type\": [\n                \"string\",\n                \"null\"\n              ]\n            },\n            \"data\": {\n              \"description\": \"Parsed JSON when the textual result is JSON.\"\n            },\n            \"name\": {\n              \"type\": \"string\"\n            },\n            \"mime\": {\n              \"type\": \"string\"\n            },\n            \"files\": {\n              \"type\": \"array\",\n              \"items\": {\n                \"type\": \"object\",\n                \"required\": [\n                  \"name\",\n                  \"mime\",\n                  \"bytes\",\n                  \"base64\"\n                ],\n                \"properties\": {\n                  \"name\": {\n                    \"type\": \"string\"\n                  },\n                  \"mime\": {\n                    \"type\": \"string\"\n                  },\n                  \"bytes\": {\n                    \"type\": \"integer\"\n                  },\n                  \"base64\": {\n                    \"type\": \"string\",\n                    \"contentEncoding\": \"base64\"\n                  }\n                }\n              }\n            }\n          }\n        }\n      }\n    },\n    \"processing\": \"Server; same transformation code as browser tools\",\n    \"limits\": {\n      \"request_bytes\": 8388608,\n      \"input_characters\": 1000000,\n      \"files_bytes\": 5242880,\n      \"max_files\": 0,\n      \"timeout_seconds\": 12\n    }\n  },\n  \"agent_processing\": \"Server; same transformation code as browser tools\",\n  \"browser_agent\": {\n    \"supported\": true,\n    \"name\": \"run_current_tool\",\n    \"discovery\": \"WebMCP on the human page in a supporting browser\",\n    \"verification\": \"See audit/API-AUDIT.md; availability is not verification\"\n  }\n}\n```\n\n## Page guide\n\nWrite a whole number in English words.\n\n## Useful next steps\n\n- [Remove duplicate lines](https://happytails.ai/en/text-tools/remove-duplicate-lines/): Remove repeated lines while keeping their first occurrence. ([Markdown](https://happytails.ai/en/text-tools/remove-duplicate-lines.md))\n\n- [Remove extra spaces](https://happytails.ai/en/text-tools/remove-extra-spaces/): Tidy repeated spaces without losing line breaks. ([Markdown](https://happytails.ai/en/text-tools/remove-extra-spaces.md))\n\n- [Sort lines](https://happytails.ai/en/text-tools/sort-lines/): Sort lines alphabetically or in natural number order. ([Markdown](https://happytails.ai/en/text-tools/sort-lines.md))\n\n## How to use Number to words\n\n1. Enter whole number in the input field.\n2. The result updates as you type. Adjust the available settings if needed.\n3. Review the result, then use Copy result or a download link when available.\n\n## What to expect\n\nWrite a whole number in English words. English whole numbers only. Decimal, currency and other-language modes are not available.\n\n### Try a small example\n\n```json\n42\n```\n"
}