What robots.txt is and what it is not
A robots.txt file is a crawl hint for compliant bots. It can suggest which paths should or should not be crawled, but it does not hide private content, replace authentication, or block direct access from a browser.
The main job is rule clarity
Most mistakes are caused by path prefixes that are broader than intended, or by forgetting that a rule applies to a specific user-agent block. Clear rules are more valuable than complicated ones.
Key directives to review
| Directive | Purpose |
|---|---|
| User-agent | Choose which crawler the following rules apply to |
| Disallow | Suggest paths that should not be crawled |
| Allow | Open specific paths inside a broader blocked area |
| Sitemap | Point crawlers to your sitemap location |
このツールの使い方
- Prepare representative user-agent rules, allow paths, disallow paths, crawl-delay notes, and sitemap URLs in robots.txt 生成 instead of starting with the largest or most sensitive real input.
- Run the workflow, generate a robots.txt file body ready for review before deployment, and review path prefixes, rule order, sitemap URLs, crawler-specific agents, and accidental blocking of public pages before deciding the result is ready.
- Only copy or download the result after it fits new site launches, staging protection, admin path exclusion, sitemap declaration, and SEO handoff and no longer conflicts with this constraint: Robots rules are public hints for compliant crawlers and should not be used as access control for private content.
robots.txt 生成 の例
この例は、robots.txt 生成 が想定している入力の形と、自分の作業に使う前に確認しておきたい結果の見え方を示しています。
入力例
Allow /, disallow /admin, sitemap https://codertools.site/sitemap.xml
期待される出力
User-agent: *
Allow: /
Disallow: /admin
Sitemap: https://codertools.site/sitemap.xmlA practical caution for staging and private paths
If a path must truly stay private, use authentication or network restrictions, not robots.txt. The file itself is public, which means it can also reveal exactly where sensitive paths live.
実用上の注意
- robots.txt 生成 は既定でブラウザ内で動作するため、別のツールチェーンを用意せずにすばやくローカル確認を行えます。
- 実際の入力が大きい、機密性が高い、または業務上重要な場合は、まず代表的なサンプルから始めてください。
- 本番環境、顧客向け、法務、財務、安全性が重要な作業に使う前に、最終結果を必ず確認してください。
robots.txt 生成 の参考情報
robots.txt 生成 は、設定可能なオプション、生成結果、再利用前の確認方法を説明します。
- 代表的な出力が得られる最小設定から始め、期待どおりか確認してから範囲を広げます。
- 生成された内容は下書き、テスト、プレースホルダーには便利ですが、公開前に確認してください。
- パスワード、robots 指示、サイトマップ、メタデータなどの本番ルールは、実際のシステム要件と照合してください。
参考資料
FAQ
robots.txt 生成 の用途と、入力・出力・結果に関するよくある疑問をまとめています。Allow、Disallow、Sitemap ルール付きの整った robots.txt を生成します。
What kind of user-agent rules, allow paths, disallow paths, crawl-delay notes, and sitemap URLs is robots.txt 生成 best suited for?
robots.txt 生成 is built to generate robots.txt directives. It is most useful when user-agent rules, allow paths, disallow paths, crawl-delay notes, and sitemap URLs must become a robots.txt file body ready for review before deployment for new site launches, staging protection, admin path exclusion, sitemap declaration, and SEO handoff.
What should I review in the a robots.txt file body ready for review before deployment before I reuse it?
Review path prefixes, rule order, sitemap URLs, crawler-specific agents, and accidental blocking of public pages first. Those details are the fastest way to tell whether the result is actually ready for downstream reuse.
Where does the a robots.txt file body ready for review before deployment from robots.txt 生成 usually go next?
A typical next step is new site launches, staging protection, admin path exclusion, sitemap declaration, and SEO handoff. The output is written to be reused there directly instead of acting like a generic placeholder.
When should I stop and manually double-check the result from robots.txt 生成?
Robots rules are public hints for compliant crawlers and should not be used as access control for private content.