{
  "title": "Word frequency",
  "human_url": "https://happytails.ai/en/text-tools/word-frequency/",
  "agent_url": "https://happytails.ai/agents/en/text-tools/word-frequency/",
  "language": "en",
  "markdown_url": "https://happytails.ai/en/text-tools/word-frequency.md",
  "content": "Word frequency\nCount word occurrences, starting with the most frequent.\nHow to use Word frequency\nEnter your text 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\nCount word occurrences, starting with the most frequent. Matching ignores case and uses English word segmentation. Output is tab-separated; stop-word filtering is not available.\nTry a small example\nHello hello world\nUseful next steps\nDuplicate word finder\nList repeated words and how often they appear.\nFind and replace\nReplace every exact match with your chosen text.\nCompare text\nCompare two versions of text, line by line.",
  "content_format": "text/plain",
  "visibility": "public",
  "links": [
    {
      "name": "Duplicate word finder List repeated words and how often they appear.",
      "url": "https://happytails.ai/en/text-tools/duplicate-word-finder/"
    },
    {
      "name": "Find and replace Replace every exact match with your chosen text.",
      "url": "https://happytails.ai/en/text-tools/find-and-replace/"
    },
    {
      "name": "Compare text Compare two versions of text, line by line.",
      "url": "https://happytails.ai/en/text-tools/compare-text/"
    }
  ],
  "tool": {
    "id": "word-frequency",
    "category": "text-tools",
    "built": true,
    "requirements": "Token rules, locale, stop-word options and CSV export; no universal readability claims.",
    "implementation": {
      "fields": [],
      "experience": {
        "automatic": true,
        "single": false,
        "label": "Your text",
        "placeholder": "Hello world!",
        "help": "Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.",
        "action": null
      },
      "mode": "automatic",
      "interactive": false
    },
    "execution": "POST /api/v1/tools/word-frequency/run",
    "api": {
      "id": "word-frequency",
      "name": "Word frequency",
      "category": "text-tools",
      "description": "Count word occurrences, starting with the most frequent.",
      "notes": "",
      "human_path": "/en/text-tools/word-frequency/",
      "method": "POST",
      "endpoint": "/api/v1/tools/word-frequency/run",
      "schema_url": "/api/v1/tools/word-frequency",
      "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": "# Word frequency\n\n- Human page: https://happytails.ai/en/text-tools/word-frequency/\n- Markdown: https://happytails.ai/en/text-tools/word-frequency.md\n- Structured JSON: https://happytails.ai/agents/en/text-tools/word-frequency/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `word-frequency` |\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/word-frequency/run |\n| Browser-agent interface | run_current_tool |\n\n### Inputs and settings\n\nText input: Your text.\n\nExample or placeholder shown in the interface (not a validated fixture):\n\n```text\nHello world!\n```\n\nChange the input or settings to update your result. 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/word-frequency/run\nContent-Type: application/json\n```\n\n[Detailed operation reference](https://happytails.ai/en/api/tools/word-frequency.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 2026-09-28T18:13:34Z. This is historical evidence, not a new validation or a guarantee for every input.\n\n```json\n{\n  \"input\": \"Hello hello world\",\n  \"options\": {}\n}\n```\n\n```json\n{\n  \"tool\": \"word-frequency\",\n  \"result\": {\n    \"text\": \"hello\\t2\\nworld\\t1\",\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\nToken rules, locale, stop-word options and CSV export; no universal readability claims.\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\": \"word-frequency\",\n  \"category\": \"text-tools\",\n  \"built\": true,\n  \"requirements\": \"Token rules, locale, stop-word options and CSV export; no universal readability claims.\",\n  \"implementation\": {\n    \"fields\": [],\n    \"experience\": {\n      \"automatic\": true,\n      \"single\": false,\n      \"label\": \"Your text\",\n      \"placeholder\": \"Hello world!\",\n      \"help\": \"Change the input or settings to update your result. 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/word-frequency/run\",\n  \"api\": {\n    \"id\": \"word-frequency\",\n    \"name\": \"Word frequency\",\n    \"category\": \"text-tools\",\n    \"description\": \"Count word occurrences, starting with the most frequent.\",\n    \"notes\": \"\",\n    \"human_path\": \"/en/text-tools/word-frequency/\",\n    \"method\": \"POST\",\n    \"endpoint\": \"/api/v1/tools/word-frequency/run\",\n    \"schema_url\": \"/api/v1/tools/word-frequency\",\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\nCount word occurrences, starting with the most frequent.\n\n## How to use Word frequency\n\n1. Enter your text 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\nCount word occurrences, starting with the most frequent. Matching ignores case and uses English word segmentation. Output is tab-separated; stop-word filtering is not available.\n\n### Try a small example\n\n```\nHello hello world\n```\n\n## Useful next steps\n\n- [Duplicate word finder](https://happytails.ai/en/text-tools/duplicate-word-finder/): List repeated words and how often they appear. ([Markdown](https://happytails.ai/en/text-tools/duplicate-word-finder.md))\n\n- [Find and replace](https://happytails.ai/en/text-tools/find-and-replace/): Replace every exact match with your chosen text. ([Markdown](https://happytails.ai/en/text-tools/find-and-replace.md))\n\n- [Compare text](https://happytails.ai/en/text-tools/compare-text/): Compare two versions of text, line by line. ([Markdown](https://happytails.ai/en/text-tools/compare-text.md))\n"
}