{
  "title": "DNS name length checker",
  "human_url": "https://happytails.ai/en/developer-tools/dns-name-length-checker/",
  "agent_url": "https://happytails.ai/agents/en/developer-tools/dns-name-length-checker/",
  "language": "en",
  "markdown_url": "https://happytails.ai/en/developer-tools/dns-name-length-checker.md",
  "content": "DNS name length checker\nPaste one DNS name per line.\nHow can we improve this tool?\nReport a problem or share an idea.\nPlease leave out private information. Your message and the tool name go to our team via PostHog.\nHow to use DNS name length checker\nPaste text or JSON in the documented format.\nReview the bounded report and explicit assumptions.\nDownload complete JSON or CSV.\nUseful next steps\nDNS zone diff\nHTTP cache policy analyzer\nIP allowlist overlap checker\nKnow the interpretation limits\nPaste one DNS name per line. Labels are measured in UTF-8 bytes against 63-octet limits and the absolute wire name against 255 octets. IDNA conversion is not performed.\nKeep the complete report\nSearch and sort apply to the first 200 rows. Download JSON or CSV for every row and the assumptions.",
  "content_format": "text/plain",
  "visibility": "public",
  "links": [
    {
      "name": "DNS zone diff",
      "url": "https://happytails.ai/en/developer-tools/dns-zone-diff/"
    },
    {
      "name": "HTTP cache policy analyzer",
      "url": "https://happytails.ai/en/developer-tools/http-cache-policy-analyzer/"
    },
    {
      "name": "IP allowlist overlap checker",
      "url": "https://happytails.ai/en/developer-tools/ip-allowlist-overlap-checker/"
    }
  ],
  "tool": {
    "id": "dns-name-length-checker",
    "category": "developer-tools",
    "built": true,
    "requirements": "Process up to 500000 input characters and 20000 records locally. Reports export completely up to 40 million characters and 500000 CSV records. Analysis is local with a 10-second timeout. Preview tables show the first 200 rows; your data is not uploaded.",
    "implementation": {
      "fields": [],
      "presentation": "metrics",
      "inputMaxLength": 500000,
      "inputErrorCode": "NETWORK_DIAGNOSTICS_INPUT",
      "note": "Paste one DNS name per line. Labels are measured in UTF-8 bytes against 63-octet limits and the absolute wire name against 255 octets. IDNA conversion is not performed. Process up to 500000 input characters and 20000 records locally. Reports and source text export completely, capped at 40 million characters and 500000 CSV records. Previews show the first 200 rows; analysis stops after 10 seconds. No data is uploaded.",
      "example": {
        "input": "example.com\nvery-long-label.example.",
        "options": {}
      },
      "experience": {
        "automatic": false,
        "single": false,
        "inputMaxLength": 500000,
        "inputMode": "text",
        "label": "Your text",
        "placeholder": "Type or paste your input…",
        "help": "Up to 500,000 characters. Review the settings before running.",
        "action": null
      },
      "mode": "explicit",
      "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"
    }
  },
  "markdown": "# DNS name length checker\n\n- Human page: https://happytails.ai/en/developer-tools/dns-name-length-checker/\n- Markdown: https://happytails.ai/en/developer-tools/dns-name-length-checker.md\n- Structured JSON: https://happytails.ai/agents/en/developer-tools/dns-name-length-checker/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `dns-name-length-checker` |\n| Category | developer-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 | run_current_tool |\n\n### Implementation notes\n\nPaste one DNS name per line. Labels are measured in UTF-8 bytes against 63-octet limits and the absolute wire name against 255 octets. IDNA conversion is not performed. Process up to 500000 input characters and 20000 records locally. Reports and source text export completely, capped at 40 million characters and 500000 CSV records. Previews show the first 200 rows; analysis stops after 10 seconds. No data is uploaded.\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\nType or paste your input…\n```\n\nUp to 500,000 characters. Review the settings before running.\n\nNo additional settings are declared for this tool.\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\nProcess up to 500000 input characters and 20000 records locally. Reports export completely up to 40 million characters and 500000 CSV records. Analysis is local with a 10-second timeout. Preview tables show the first 200 rows; your data is not uploaded.\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\": \"dns-name-length-checker\",\n  \"category\": \"developer-tools\",\n  \"built\": true,\n  \"requirements\": \"Process up to 500000 input characters and 20000 records locally. Reports export completely up to 40 million characters and 500000 CSV records. Analysis is local with a 10-second timeout. Preview tables show the first 200 rows; your data is not uploaded.\",\n  \"implementation\": {\n    \"fields\": [],\n    \"presentation\": \"metrics\",\n    \"inputMaxLength\": 500000,\n    \"inputErrorCode\": \"NETWORK_DIAGNOSTICS_INPUT\",\n    \"note\": \"Paste one DNS name per line. Labels are measured in UTF-8 bytes against 63-octet limits and the absolute wire name against 255 octets. IDNA conversion is not performed. Process up to 500000 input characters and 20000 records locally. Reports and source text export completely, capped at 40 million characters and 500000 CSV records. Previews show the first 200 rows; analysis stops after 10 seconds. No data is uploaded.\",\n    \"example\": {\n      \"input\": \"example.com\\nvery-long-label.example.\",\n      \"options\": {}\n    },\n    \"experience\": {\n      \"automatic\": false,\n      \"single\": false,\n      \"inputMaxLength\": 500000,\n      \"inputMode\": \"text\",\n      \"label\": \"Your text\",\n      \"placeholder\": \"Type or paste your input…\",\n      \"help\": \"Up to 500,000 characters. Review the settings before running.\",\n      \"action\": null\n    },\n    \"mode\": \"explicit\",\n    \"interactive\": false\n  },\n  \"execution\": \"Browser interface\",\n  \"api\": null,\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\nPaste one DNS name per line.\n\nHow can we improve this tool?\n\nReport a problem or share an idea.\n\nPlease leave out private information. Your message and the tool name go to our team via PostHog.\n\n### How to use DNS name length checker\n\n1. Paste text or JSON in the documented format.\n2. Review the bounded report and explicit assumptions.\n3. Download complete JSON or CSV.\n\n## Useful next steps\n\n- [DNS zone diff](https://happytails.ai/en/developer-tools/dns-zone-diff/) ([Markdown](https://happytails.ai/en/developer-tools/dns-zone-diff.md))\n\n- [HTTP cache policy analyzer](https://happytails.ai/en/developer-tools/http-cache-policy-analyzer/) ([Markdown](https://happytails.ai/en/developer-tools/http-cache-policy-analyzer.md))\n\n- [IP allowlist overlap checker](https://happytails.ai/en/developer-tools/ip-allowlist-overlap-checker/) ([Markdown](https://happytails.ai/en/developer-tools/ip-allowlist-overlap-checker.md))\n\n## Know the interpretation limits\n\nPaste one DNS name per line. Labels are measured in UTF-8 bytes against 63-octet limits and the absolute wire name against 255 octets. IDNA conversion is not performed.\n\n### Keep the complete report\n\nSearch and sort apply to the first 200 rows. Download JSON or CSV for every row and the assumptions.\n"
}