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ETF Agent · Engineering NotesHow AI agents are built, governed, and evolved.

A curated engineering library organized around modules, architecture, and AI-assisted development. English translations are added alongside new articles.

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Start with why tool results should not all enter model context, then continue to traceable tool execution and memory effects that survive answer failures.

Newly translated reading paths ​

Mermaid diagrams, tables and their decision labels are localized in the respective article editions. Existing standalone SVG/HTML galleries may still use Chinese labels until their separate visual translations are published.

The complete catalog follows the canonical reading tree and includes every original article. Articles without an English translation are clearly labeled Chinese original and keep linking to their original text. We do not substitute summaries for full translations.

For an architecture decision map, see eight core principles and six on-demand engineering methods. The writing roadmap separates planned additions from revisions to existing essays; neither is counted as a published article.

Browse financial technology topics, the architecture gallery, or our writing roadmap.

Our articles discuss engineering mechanisms and bounded evidence; they do not constitute investment advice or claims of production-level validation.

Engineering notes, evidence and boundaries.