Field notes on AI systems

Building AI systems from the field.

Essays on AI application development, field engineering, Dify, and the developer workflows behind production systems.

Author: Xinyang Zhang
Practice: AI developer · FDE engineer · Dify developer relations

Ancient Roman marble handshake sculpture detail from the Pergamon Museum — Ancient Roman marble hands, Pergamon Museum. Photo: سندباد / Wikimedia Commons, GFDL.

AI application development Field engineering notes Dify developer relations

Writing

Essays on AI systems, agents, Dify, and field engineering.

Ancient Greek marble inscription used as the cover image for the SKILL.md essay

Essay · Skills

Why SKILL.md will last

声明式能力接口、Agent 工作流，以及为什么简单的文件结构可能长期存在。

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Upcoming · AI agents

What makes an agent workflow production-ready?

Routing, memory, evaluation, observability, and the details that turn an agent into infrastructure.

Upcoming · Dify

Notes from building with Dify in the field

Patterns from developer questions, implementation work, and community feedback loops.

Topics

The recurring problems behind the writing.

AI systems

Agent workflows, evaluation, and productized AI.

Field engineering

Customer context, debugging, and shipping in real environments.

Dify & DevRel

Developer education, demos, ecosystem work, and community signals.

Open source ops

Issue triage, support automation, and contributor workflows.

Working position

Build from the field.Write for developers.

This site is a working notebook for the practical side of AI systems: how developers use tools, how products behave in the field, and how support signals become product and engineering work.