Simon Willison’s Weblog

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Sunday, 15th March 2026

Agentic Engineering Patterns >

What is agentic engineering?

I use the term agentic engineering to describe the practice of developing software with the assistance of coding agents.

What are coding agents? They're agents that can both write and execute code. Popular examples include Claude Code, OpenAI Codex, and Gemini CLI.

What's an agent? Clearly defining that term is a challenge that has frustrated AI researchers since at least the 1990s but the definition I've come to accept, at least in the field of Large Language Models (LLMs) like GPT-5 and Gemini and Claude, is this one: [... 617 words]

# 10:41 pm / coding-agents, agent-definitions, generative-ai, agentic-engineering, ai, llms

Museum John M. Mossman Lock Collection — 20 West 44th Street, New York, NY 10036

The General Society of Mechanics and Tradesmen of the City of New York is home to the John M. Mossman Lock Collection, likely the world's largest collection of antique bank locks.

Combination Lock - catalog page 127, Combination Revolving Bolt Lock, page 130, Combination Lock, also page 130 - each lock is made of brass and looks complicated and robust
Saturday, 14th March 2026
Monday, 16th March 2026