Agentic Coding: The Future of Software Development With Agents

BlogSimon WillisonJun 14, 2025

AI Summary

Simon Willison's June 2025 long-form post arguing that agentic coding (Claude Code, Cursor agent mode, Codex CLI) is now the dominant pattern for using LLMs to write production code, and that prompt engineering as a standalone discipline is being absorbed into harness design. Walks through his own workflow with Claude Code, the rituals that work, and the failure modes that don't. The clearest single observation post on what 'agentic' actually means in 2025 from someone running it daily.

31 more articles in this vault.

Import the full Agent Harnesses vault to Burn 451 and build your own knowledge base.

Content attributed to the original author (Simon Willison). Burn 451 curates publicly available writing as a reading index. For removal requests, contact @hawking520.