Avani Chaskar
Avani Chaskar, Ashutosh MaheshwariGet insights into using AI for real world scenarios.
| Platform |  | Pricing | Only free issues | Publishes | Twice weekly |
|---|---|---|---|---|---|
| Issues | 35 | Founded | 2 years ago | Last Issue | 11 days ago |
| Active | |||||
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avanichaskar.substack.comLatest Issues
Where RAG Fails?
A RAG answer can fail in two ways.
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The right context never reaches the model.
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Or it does—and the model still gets it wrong.
If you only score the final answer, you cannot tell which one happened.
The failure map...
[2-minute read] How to Safely Swap an LLM in Production
Most teams treat an LLM upgrade like this:
model = "new-model"
Change the config. Run a few tests. Ship it.
Can you switch models without breaking production?
An LLM API makes model changes look like a one-line configuratio...
How FastAPI Uses Pydantic to Validate Every Request
Recap: part 1 was validation basics, part 2 was fields and constraints, part 3 was nested models, part 4 was config. In production, you don’t call .model_validate() by hand — a framework does it on every request. Usually, that’s FastAPI....
How Meta Secures an AI Agent That Can Act on Your Behalf
AI agents change the security problem.
A chatbot can give you a bad answer.
An agent can send the email, access the account, visit the website, download the file, or spend the money.
That makes a simple question much harder:
What happ...
Pydantic Settings 101: .env Files, Secrets, and Fail-Fast Config
A missing environment variable took down a production deploy at 3am. Not a bad request. Not bad user input. The app’s own configuration was wrong, and nothing caught it until the app was already live. Here’s how Pydantic stops that.
Quick...
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Authors
The writers behind this newsletter.
Senior Software Engineer & AI Architect | Deep Dives into RAG & Agentic Workflows
I've built products for over a billion users at YouTube and Google Search. Now, I deconstruct complex systems and production AI for 80,000+ engineers each week. Subscribe to learn the principles behind building at hyperscale.
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