DanLevy.net

Measure the evaluator's variance, then rebuild its prompt from zero.

An open-source security workbench that keeps scope, approvals, tools, and evidence in one project.

Route to the best model with confidence.

Reduce local-dev risk with containers, canaries, and boring limits

The search tools already in your database, and when each one earns its keep.

The full search landscape: exact, fuzzy, semantic, hybrid — and when to layer all of them.

Benchmarks measure benchmarks.

Simplify Model & Provider Config with `llm://` URLs

How to secure your local or VPS OpenClaw/Moltbot setup

They are bad at it.

Deterministic patterns for non-deterministic models.

Why MCP is the USB-C of Artificial Intelligence.

If your agent doesn't have guardrails, you aren't ready for production.

LLM Routing, so hot right now

The microtask queue ate my homework (and my debugging context).

What a train ticket taught me about storing time in databases

JSONB is powerful, useful, and very easy to misuse when you let a blob become your real schema.

Fixing weak code with weak references!

Ask what you're actually optimizing for.

Are your exceptions truly exceptional?

Why updates can't save you

You can thank AI.

Human or Machine?

So pure it hurts

Static sites probably do not need hosted search

Secure your self-hosted services, from defense to monitoring!

How to Harness the Full Potential of MCQs in Education

Extract & Parse URL-like Strings with a Single Regex

Can you navigate the cloud labyrinth?

(Borrow) check yo self before you wreck yo self!

A collection of open-source projects I've worked on.

How I learned to stop worrying and love the GPT.

Are you SQL Steele?

Does SQL make you squeal?

Can you talk to computers?

Test your knowledge of files, streams & buffers

Can you tame some wild RegEx?

Are you a maestro of Destructuring?

Are you front-end enough?

Are you team SQL?

Can you BS a Binary Tree?

Prove your esteemed JavaScript skillz!

Do you know the less-famous bits of ES2015?

Prove yourself!

Know your `parseInt` from `parseFloat`?

Are you front-end enough?

Is Multiple Choice the Best Choice?

Staff engineers hate this!

Breaking Unicorns

Localized money explained!