Ler Tech Notes
LerLer ChanInstructor of AI Agent classes | Programmer since 2010 | Blogging since 2007 | Helping working adults and students build practical AI tools | Exploring ethical AI writing, automation, and education.
| Platform |  | Pricing | Freemium | Publishes | Twice weekly |
|---|---|---|---|---|---|
| Issues | 57 | Founded | a year ago | Last Issue | 15 days ago |
| Active | |||||
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lertechnotes.substack.comLatest Issues
How to Test Your AI Agent Before Going Live: Scenario Testing vs Regression Testing
I pushed an FYP assistant agent to students without proper testing. The happy path worked fine. Then a student uploaded a Word doc instead of a PDF and the whole workflow silently failed — no error, just a wrong answer delivered with full c...
AI Agent Loop Engineering: Why Your Agent Stops at Loop 1 (And How to Fix It)
Most people I meet at workshops think they’ve “built an agent” because they got Claude to call a tool and loop until done. That’s Loop 1. It’s the starting line, not the finish line.
Last week, three separate things landed in my inbox at t...
Playwright vs Playwright MCP vs Webwright vs Browserbase: Which Should You Use with Claude Code?
Quick verdict: For Claude Code users on a budget — raw Playwright for deterministic CI/CD, Playwright MCP (@playwright/cli mode) for ad-hoc agent tasks, Webwright when you need a reusable script from a long-horizon run, and Browserbase on...
Validate Before You Vibe Code: How I Use Claude as an Adversarial PM
The fastest way to waste a week is to vibe code something nobody wants.
I’ve done it. You probably have too. The AI writes fast, the feature looks good in the demo, and then you ship it and — silence. No users. No feedback. Nothing. Becaus...
How to Deploy a Vibe-Coded App to GitHub Pages Using AI (6 Prompts, Zero Manual Setup)
You’ve finished vibe-coding something. It actually works. Now what?
Most people stall here. They know they need to push to GitHub, set up CI/CD, and somehow get a public URL — but suddenly it feels like real work again. The vibe is gone....
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Instructor of AI Agent classes | Programmer since 2010 | Blogging since 2007 | Helping working adults and students build practical AI tools | Exploring ethical AI writing, automation, and education.
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