# Digital Engine by Darren Huang

> Personal notes on SEO, AI, content strategy, web analytics, and technology.

Digital Engine currently publishes 86 English article translations and 24 English saved Facebook notes.
Publication and update dates come from the original Chinese content. Treat time-sensitive statements in their historical context and verify current claims with primary sources.

## Content indexes

- [English article index](https://www.darrenhuang.com/en/articles-llms.txt): Dates, summaries, and Markdown versions of every English article.
- [English note index](https://www.darrenhuang.com/en/notes-llms.txt): Dates, summaries, and Markdown versions of 24 English saved Facebook notes.
- [All articles](https://www.darrenhuang.com/en/articles.html): The reader-facing English article archive.
- [Saved Facebook notes](https://www.darrenhuang.com/en/notes.html): 24 English notes translated from the saved Chinese Facebook archive.
- [Categories](https://www.darrenhuang.com/en/categories.html): Browse English articles by category.
- [Topics](https://www.darrenhuang.com/en/tags.html): Browse English articles by topic.
- [Web Stories](https://www.darrenhuang.com/en/web-stories.html): Two English Web Stories with translated page-by-page transcripts and AMP artifacts.

## Site information

- [About Darren](https://www.darrenhuang.com/en/about.md): Darren's background and the relationship between Digital Engine and 數位引擎.
- [Contact](https://www.darrenhuang.com/en/contact.md): Contact Darren about SEO, AI, automation, and content strategy.
- [Privacy](https://www.darrenhuang.com/en/privacy.md): Public content, analytics, third-party services, and data-handling summary.
- [Public archive](https://www.darrenhuang.com/en/membership.md): Articles and archived newsletters are free to read without a membership.
- [English RSS](https://www.darrenhuang.com/en/rss.xml): English article feed.
- [Sitemap](https://www.darrenhuang.com/sitemap-index.xml): Canonical URLs and language alternates.

## Programmatic interfaces

- [English content metadata](https://www.darrenhuang.com/api/en/content.json): English article and saved-note metadata with Markdown URLs.
- [OpenAPI specification](https://www.darrenhuang.com/openapi.json): The read-only content API and MCP endpoint.
- [API Catalog](https://www.darrenhuang.com/.well-known/api-catalog): RFC 9727 API discovery.
- [MCP Server Card](https://www.darrenhuang.com/.well-known/mcp/server-card.json): Public read-only MCP endpoint and tools.
- [Developer and Agent Portal](https://www.darrenhuang.com/en/developers.md): API, MCP, WebMCP, errors, and version policy.

## Agent guidance

- Start with this file and the English article index, then open only the Markdown pages relevant to the task.
- Each Markdown page includes its canonical HTML URL and translation key in frontmatter. Cite the canonical URL.
- English translations preserve the original publication date and historical context.
- Do not treat historical descriptions of products, interfaces, policies, or algorithms as verified current behavior.