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Avnish Yadav

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Engineering Notes

Practical guides for AI, automation, and product engineering.

Field notes from systems I build: agents, n8n workflows, developer tools, micro-SaaS, and production architecture.

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Technical Tutorials

Building Long-Term Memory: Setting Up Vector Databases for Semantic Search in LangChain

Avnish Yadav – February 22, 2026 · 8 MIN READ

Building Long-Term Memory: Setting Up Vector Databases for Semantic Search in LangChain

LLMs have a context limit; your data doesn't. Learn how to implement vector databases in LangChain to enable semantic search and build robust RAG pipelines.

Technical TutorialsBeyond Built-ins: Architecting Custom Tools in LangChain

Avnish Yadav – February 22, 2026 · 7 MIN READ

Beyond Built-ins: Architecting Custom Tools in LangChain

Standard LangChain tools handle the basics, but production agents need to touch internal APIs and proprietary logic. Here is a deep dive into building robust, Pydantic-validated custom tools.