Simon Willison's Weblog simonwillison.net

Introducing GPT-5.2-Codex

simonwillison.net·19w

Agent Skills

simonwillison.net·19w·Hacker News

swift-justhtml

simonwillison.net·19w

Your job is to deliver code you have proven to work

simonwillison.net·19w·Lobsters, Hacker News, r/programming

Inside PostHog: How SSRF, a ClickHouse SQL Escaping 0day, and Default PostgreSQL Credentials Formed an RCE Chain

simonwillison.net·19w

AoAH Day 15: Porting a complete HTML5 parser and browser test suite

simonwillison.net·19w

Gemini 3 Flash

simonwillison.net·19w·Hacker News

firefox parser/html/java/README.txt

simonwillison.net·19w

The new ChatGPT Images is here

simonwillison.net·19w

s3-credentials 0.17

simonwillison.net·19w

ty: An extremely fast Python type checker and LSP

simonwillison.net·19w

Poe the Poet

simonwillison.net·19w

Quoting Gemini thinking trace

simonwillison.net·19w

Quoting Kent Beck

simonwillison.net·19w

2025 Word of the Year: Slop

simonwillison.net·19w

JustHTML is a fascinating example of vibe engineering in action

simonwillison.net·19w·Hacker News

Copywriters reveal how AI has decimated their industry

simonwillison.net·20w

Quoting Obie Fernandez

simonwillison.net·20w

Quoting OpenAI Codex CLI

simonwillison.net·20w

LLM 0.28

simonwillison.net·20w

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