{
  "title": "Stopwatch",
  "human_url": "https://happytails.ai/en/date-time-tools/stopwatch/",
  "agent_url": "https://happytails.ai/agents/en/date-time-tools/stopwatch/",
  "language": "en",
  "markdown_url": "https://happytails.ai/en/date-time-tools/stopwatch.md",
  "content": "Stopwatch\nMeasure elapsed time and take lap readings.\nUseful next steps\nTimer\nSet a countdown in seconds.\nHow to use Stopwatch\nChoose Start / pause to begin.\nChoose Lap to read the current elapsed time, or Start / pause to pause.\nChoose Reset when you want to start a fresh session.\nWhat to expect\nMeasure elapsed time and take lap readings. Start or pause the clock with the same button. Reset stops the clock and returns it to zero. Keep the page open to preserve the current session.",
  "content_format": "text/plain",
  "visibility": "public",
  "links": [
    {
      "name": "Timer Set a countdown in seconds.",
      "url": "https://happytails.ai/en/date-time-tools/timer/"
    }
  ],
  "tool": {
    "id": "stopwatch",
    "category": "date-time-tools",
    "built": true,
    "requirements": "Lap times, keyboard controls and monotonic elapsed time.",
    "implementation": {
      "fields": [],
      "input": false,
      "note": "Elapsed time uses the browser’s monotonic clock.",
      "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": true
    },
    "execution": "Browser interface",
    "api": null,
    "browser_agent": {
      "supported": false,
      "name": null,
      "discovery": "WebMCP on the human page in a supporting browser",
      "verification": "See audit/API-AUDIT.md; availability is not verification"
    }
  },
  "markdown": "# Stopwatch\n\n- Human page: https://happytails.ai/en/date-time-tools/stopwatch/\n- Markdown: https://happytails.ai/en/date-time-tools/stopwatch.md\n- Structured JSON: https://happytails.ai/agents/en/date-time-tools/stopwatch/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `stopwatch` |\n| Category | date-time-tools |\n| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |\n| Browser execution | Use the visible action or interactive controls. |\n| Browser processing | Browser; see tool notes for network behavior. |\n| HTTP API | Not callable through HTTP. |\n| Browser-agent interface | No callable WebMCP interface. |\n\n### Implementation notes\n\nElapsed time uses the browser’s monotonic clock.\n\n### Inputs and settings\n\nNo free-text input is required. Use the file inputs and/or settings below.\n\nNo additional settings are declared for this tool.\n\n### Planning specification\n\nLap times, keyboard controls and monotonic elapsed time.\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\": \"stopwatch\",\n  \"category\": \"date-time-tools\",\n  \"built\": true,\n  \"requirements\": \"Lap times, keyboard controls and monotonic elapsed time.\",\n  \"implementation\": {\n    \"fields\": [],\n    \"input\": false,\n    \"note\": \"Elapsed time uses the browser’s monotonic clock.\",\n    \"experience\": {\n      \"automatic\": false,\n      \"single\": false,\n      \"label\": \"Your text\",\n      \"placeholder\": \"Type or paste your input…\",\n      \"help\": \"Up to 1,000,000 characters. Review the settings before running.\",\n      \"action\": null\n    },\n    \"mode\": \"explicit\",\n    \"interactive\": true\n  },\n  \"execution\": \"Browser interface\",\n  \"api\": null,\n  \"browser_agent\": {\n    \"supported\": false,\n    \"name\": null,\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\nMeasure elapsed time and take lap readings.\n\n## Useful next steps\n\n- [Timer](https://happytails.ai/en/date-time-tools/timer/): Set a countdown in seconds. ([Markdown](https://happytails.ai/en/date-time-tools/timer.md))\n\n## How to use Stopwatch\n\n1. Choose Start / pause to begin.\n2. Choose Lap to read the current elapsed time, or Start / pause to pause.\n3. Choose Reset when you want to start a fresh session.\n\n## What to expect\n\nMeasure elapsed time and take lap readings. Start or pause the clock with the same button. Reset stops the clock and returns it to zero. Keep the page open to preserve the current session.\n"
}