Update from code changes: Markdown 404 recovery guidance

ai/llmstxt.mdx

@@ -24,13 +24,13 @@
 
 <PreviewButton href="https://mintlify.com/docs/llms.txt">Open the llms.txt for this site.</PreviewButton>
 
-Mintlify adds HTTP headers to every page response so AI tools can discover your `llms.txt` files and other agent resources without prior knowledge of their location:
+Mintlify adds HTTP headers to every response, including [Markdown responses](/ai/markdown-export) and 404 pages, so AI tools can discover your `llms.txt` files and other agent resources without prior knowledge of their location:
 
 - `Link`: Follows the standard HTTP `Link` header format for resource discovery. Advertises `llms.txt`, `llms-full.txt`, your API catalog, [MCP server card](/ai/model-context-protocol#discovery-endpoint), [agent card](/ai/skillmd#agent-card), and [agent skills index](/ai/skillmd#skills-discovery-endpoints).
 - `X-Llms-Txt`: A convenience header for tools that check for `llms.txt` support.
 
 ```http Response headers
 Link: </llms.txt>; rel="llms-txt", </llms-full.txt>; rel="llms-full-txt", </.well-known/api-catalog>; rel="api-catalog", </.well-known/mcp/server-card.json>; rel="mcp-server-card", </.well-known/agent-card.json>; rel="agent-card", </.well-known/agent-skills/index.json>; rel="agent-skills"
 X-Llms-Txt: /llms.txt
 ```
 
@@ -69,14 +69,14 @@
 - [API reference (250 pages)](https://docs.example.com/_llms/api-reference.md): Endpoint documentation for the example API
 ```
 
 A generated index can link to further indexes. For example, `/_llms/api-reference.md` can link to `/_llms/api-reference/admin.md` when a group is too large for a single file. Agents should follow these index links recursively until they reach documentation page links. Mintlify may shorten page descriptions in a split index to keep each file under the character limit.
 
 The generated files are part of `llms.txt` and do not need to exist in your repository. They are separate from `llms-full.txt`.
 
 The `/_llms/` route uses the same base path as your documentation:
 
 - A root-hosted site serves an index at `https://docs.example.com/_llms/api-reference.md`.
 - A site hosted at `/docs` serves it at `https://example.com/docs/_llms/api-reference.md`.
 
 If you use a reverse proxy or path allowlist, forward the generated route in addition to `llms.txt`. A broad `<base-path>/*` rule already includes `<base-path>/_llms/*`. With granular rules, add `<base-path>/_llms/*` explicitly. See [Reverse proxy](/deploy/reverse-proxy#routing-configuration) for routing guidance.
 

ai/markdown-export.mdx

@@ -24,6 +24,27 @@ Send a request with `Accept: text/markdown` or `Accept: text/plain` to any page
 curl -L -H "Accept: text/markdown" https://mintlify.com/docs/ai/markdown-export
 ```
 
+## Missing pages
+
+If you request a page that doesn't exist as Markdown, Mintlify returns a 404 status with a Markdown body that helps AI tools recover. The response links to your documentation index (`llms.txt`), your full documentation file (`llms-full.txt`), and up to three related pages based on the requested path.
+
+```md Example Markdown 404 response
+> ## Documentation Index
+> Fetch the documentation index at: https://example.com/docs/llms.txt
+> Use this file to discover all available pages before exploring further.
+> For broader context, fetch the full documentation at: https://example.com/docs/llms-full.txt (large file).
+
+# Page Not Found
+
+The requested page could not be found.
+
+## Related topics
+
+- [Getting started](https://example.com/docs/getting-started.md)
+```
+
+Related page suggestions come from the same search that powers your site's [404 page](/customize/custom-404-page). Sites that use [authentication](/deploy/authentication-setup) omit suggestions and return only the documentation links.
+
 ## Audience-specific content
 
 Use the [visibility](/components/visibility) component to customize content for human and AI audiences.

es/ai/llmstxt.mdx

@@ -24,7 +24,7 @@ Consulta tu `llms.txt` añadiendo `/llms.txt` a la URL de tu sitio de documentac
 
 <PreviewButton href="https://mintlify.com/docs/llms.txt">Abrir el llms.txt de este sitio.</PreviewButton>
 
-Mintlify añade encabezados HTTP a cada respuesta de página para que las herramientas de IA puedan descubrir tus archivos `llms.txt` y otros recursos para agentes sin conocer previamente su ubicación:
+Mintlify añade encabezados HTTP a cada respuesta, incluidas las [respuestas Markdown](/es/ai/markdown-export) y las páginas 404, para que las herramientas de IA puedan descubrir tus archivos `llms.txt` y otros recursos para agentes sin conocer previamente su ubicación:
 
 - `Link`: Sigue el formato estándar del encabezado HTTP `Link` para el descubrimiento de recursos. Anuncia `llms.txt`, `llms-full.txt`, tu catálogo de API, [tarjeta del servidor MCP](/es/ai/model-context-protocol#discovery-endpoint), [tarjeta del agente](/es/ai/skillmd#agent-card) e [índice de skills del agente](/es/ai/skillmd#skills-discovery-endpoints).
 - `X-Llms-Txt`: Un encabezado de conveniencia para herramientas que verifican la compatibilidad con `llms.txt`.

es/ai/markdown-export.mdx

@@ -29,6 +29,29 @@ Envía una solicitud con `Accept: text/markdown` o `Accept: text/plain` a la URL
 curl -L -H "Accept: text/markdown" https://mintlify.com/docs/ai/markdown-export
 ```
 
+<div id="missing-pages">
+  ## Páginas inexistentes
+</div>
+
+Si solicitas en Markdown una página que no existe, Mintlify devuelve un estado 404 con un cuerpo Markdown que ayuda a las herramientas de IA a recuperarse. La respuesta enlaza al índice de tu documentación (`llms.txt`), a tu archivo de documentación completa (`llms-full.txt`) y hasta a tres páginas relacionadas según la ruta solicitada.
+
+```md Example Markdown 404 response
+> ## Documentation Index
+> Fetch the documentation index at: https://example.com/docs/llms.txt
+> Use this file to discover all available pages before exploring further.
+> For broader context, fetch the full documentation at: https://example.com/docs/llms-full.txt (large file).
+
+# Page Not Found
+
+The requested page could not be found.
+
+## Related topics
+
+- [Getting started](https://example.com/docs/getting-started.md)
+```
+
+Las sugerencias de páginas relacionadas provienen de la misma búsqueda que impulsa la [página 404](/es/customize/custom-404-page) de tu sitio. Los sitios que usan [autenticación](/es/deploy/authentication-setup) omiten las sugerencias y devuelven solo los enlaces de documentación.
+
 <div id="audience-specific-content">
   ## Contenido específico por audiencia
 </div>

fr/ai/llmstxt.mdx

@@ -24,7 +24,7 @@ Affichez votre `llms.txt` en ajoutant `/llms.txt` à l'URL de votre site de docu
 
 <PreviewButton href="https://mintlify.com/docs/llms.txt">Ouvrir le llms.txt de ce site.</PreviewButton>
 
-Mintlify ajoute des en-têtes HTTP à chaque réponse de page afin que les outils d'IA puissent découvrir vos fichiers `llms.txt` et autres ressources d'agent sans connaître au préalable leur emplacement :
+Mintlify ajoute des en-têtes HTTP à chaque réponse, y compris les [réponses Markdown](/fr/ai/markdown-export) et les pages 404, afin que les outils d'IA puissent découvrir vos fichiers `llms.txt` et autres ressources d'agent sans connaître au préalable leur emplacement :
 
 - `Link` : Suit le format standard de l'en-tête HTTP `Link` pour la découverte de ressources. Annonce `llms.txt`, `llms-full.txt`, votre catalogue d'API, la [carte du serveur MCP](/fr/ai/model-context-protocol#discovery-endpoint), l'[agent card](/fr/ai/skillmd#agent-card) et l'[index des agent skills](/fr/ai/skillmd#skills-discovery-endpoints).
 - `X-Llms-Txt` : Un en-tête pratique pour les outils qui vérifient la prise en charge de `llms.txt`.

fr/ai/markdown-export.mdx

@@ -29,6 +29,29 @@ Envoyez une requête avec `Accept: text/markdown` ou `Accept: text/plain` à l'U
 curl -L -H "Accept: text/markdown" https://mintlify.com/docs/ai/markdown-export
 ```
 
+<div id="missing-pages">
+  ## Pages introuvables
+</div>
+
+Si vous demandez en Markdown une page qui n'existe pas, Mintlify renvoie un statut 404 avec un corps Markdown qui aide les outils d'IA à se rétablir. La réponse renvoie vers l'index de votre documentation (`llms.txt`), votre fichier de documentation complète (`llms-full.txt`) et jusqu'à trois pages associées selon le chemin demandé.
+
+```md Example Markdown 404 response
+> ## Documentation Index
+> Fetch the documentation index at: https://example.com/docs/llms.txt
+> Use this file to discover all available pages before exploring further.
+> For broader context, fetch the full documentation at: https://example.com/docs/llms-full.txt (large file).
+
+# Page Not Found
+
+The requested page could not be found.
+
+## Related topics
+
+- [Getting started](https://example.com/docs/getting-started.md)
+```
+
+Les suggestions de pages associées proviennent de la même recherche que celle de la [page 404](/fr/customize/custom-404-page) de votre site. Les sites qui utilisent l'[authentification](/fr/deploy/authentication-setup) omettent les suggestions et ne renvoient que les liens de documentation.
+
 <div id="audience-specific-content">
   ## Contenu spécifique par audience
 </div>

zh/ai/llmstxt.mdx

@@ -24,7 +24,7 @@ Mintlify 会在项目根目录自动托管一个 `llms.txt` 文件，列出文
 
 <PreviewButton href="https://mintlify.com/docs/llms.txt">打开此站点的 llms.txt。</PreviewButton>
 
-Mintlify 会在每个页面的响应中添加 HTTP 标头，以便 AI 工具无需事先知道位置即可发现你的 `llms.txt` 文件以及其他代理资源：
+Mintlify 会在每个响应中添加 HTTP 标头，包括 [Markdown 响应](/zh/ai/markdown-export)和 404 页面，以便 AI 工具无需事先知道位置即可发现你的 `llms.txt` 文件以及其他代理资源：
 
 - `Link`：遵循标准 HTTP `Link` 标头格式，用于资源发现。会公布 `llms.txt`、`llms-full.txt`、你的 API 目录、[MCP 服务器卡片](/zh/ai/model-context-protocol#discovery-endpoint)、[代理卡片](/zh/ai/skillmd#agent-card)以及[代理技能索引](/zh/ai/skillmd#skills-discovery-endpoints)。
 - `X-Llms-Txt`：一个便捷标头，供检查 `llms.txt` 支持情况的工具使用。

zh/ai/markdown-export.mdx

@@ -29,6 +29,29 @@ Mintlify 会自动生成针对 AI 工具和外部 integrations 优化的页面 M
 curl -L -H "Accept: text/markdown" https://mintlify.com/docs/ai/markdown-export
 ```
 
+<div id="missing-pages">
+  ## 不存在的页面
+</div>
+
+如果你以 Markdown 形式请求一个不存在的页面，Mintlify 会返回 404 状态码以及一个帮助 AI 工具恢复的 Markdown 响应体。该响应包含指向文档索引（`llms.txt`）、完整文档文件（`llms-full.txt`）的链接，以及根据请求路径推荐的最多三个相关页面。
+
+```md Example Markdown 404 response
+> ## Documentation Index
+> Fetch the documentation index at: https://example.com/docs/llms.txt
+> Use this file to discover all available pages before exploring further.
+> For broader context, fetch the full documentation at: https://example.com/docs/llms-full.txt (large file).
+
+# Page Not Found
+
+The requested page could not be found.
+
+## Related topics
+
+- [Getting started](https://example.com/docs/getting-started.md)
+```
+
+相关页面建议来自为你站点 [404 页面](/zh/customize/custom-404-page)提供支持的同一搜索。使用[身份验证](/zh/deploy/authentication-setup)的站点会省略建议，仅返回文档链接。
+
 <div id="audience-specific-content">
   ## 面向特定受众的内容
 </div>