topic
Claude Code
7 posts tagged Claude Code.
Battle Drones: A Vibe-Coded RTS and the Agent Loop That Made It Fun
Simon Willison's Battle Drones went through 12 major iterations and 321 commits, mostly written by coding agents. The most useful parts for builders are how the agent tested its own game and why a deterministic simulation was needed.
- vibecoding
- agentic-dev
- claude-code
- game-dev
- testing
Claude Code Makes Auto Mode the Default — What Builders Need to Know
Starting August 14, Anthropic flips Claude Code's permission default from prompt-every-step to a classifier-gated auto mode for Pro, Max, and Team users — betting that confirmation fatigue, not agent capability, is the real safety gap.
- vibecoding
- claude-code
- ai-agents
- agentic-coding
- dev-tooling
One Prompt, Two Agents: Codex's Sub-Agents Out-Build Claude at Vibecoding
Simon Willison gave the same four-year-old game prompt to Claude Fable 5 and to Codex Desktop running GPT-5.6 Sol Ultra. The sub-agent-heavy Sol Ultra run shipped the more complete game — and published its exact cost.
- vibecoding
- agentic-coding
- codex
- claude-code
- ai-dev-tools
Claude Fable 5 One-Shot a Full Browser Game From a 2022 Tweet
Simon Willison handed Claude Fable 5 a four-year-old GPT-3/DALL-E gag and told it to build the whole thing with no more input from him. It shipped a playable game — and the results say a lot about what agentic coding is actually good at.
- vibecoding
- claude-fable-5
- claude-code
- ai-agents
- game-dev
Chat Is Out, Agents Are In: What Mollick's AI Tool Guide Says About 2026
Ethan Mollick's year-old advice on which AI to use has quietly stopped being about chatbots. Simon Willison's read of the latest edition is a tidy signal of where agentic coding tools actually stand.
- vibecoding
- agentic-ai
- claude-code
- ai-tooling
- developer-tools
Puter Compiled Firefox to WebAssembly — Built on a $25K Claude Tab, Paid Flat
Puter ported Gecko itself to WebAssembly so a full Firefox runs inside a browser tab — and the build is a real-world data point on what heavy agentic coding costs when it's metered versus flat-rate.
- vibecoding
- webassembly
- claude-code
- browser-engineering
- ai-coding-costs
One Prompt, One Rust File, One WASM Tool: The New Shape of Vibecoding
Simon Willison turned a Rust renderer buried in xAI's newly open-sourced Grok CLI into a browser tool with a single Claude Code prompt — a clean case study in what agentic coding now makes trivial.
- vibecoding
- ai-coding-agents
- webassembly
- claude-code
- grok-cli