11 Days, 64 AIs, 530K Lines of Code: A Complete Engineering Retrospective on Rewriting Bun from Zig to Rust
Jarred Sumner used Claude Fable 5 and 50 dynamic workflows to rewrite 535,496 lines of Zig into Rust in 11 …
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Newer Claude Models Are Worse at Using Your Tools: An Engineering Trap of RL Training Backfire
Armin discovered that Opus 4.8 and Sonnet 5 are actually more error-prone than older models when calling Pi's …
SOTA on Paper, Engineering Traps in Production: Claude Opus 5's Hidden Risks
Claude Opus 5 tops Frontier-Bench and CursorBench at half the price of Fable 5. We look past the benchmarks to …
Building AI Agents in Rust — Part 2: Structured Prompt Architecture and the Cache Boundary
Following Part 1's tool-calling loop, Part 2 dives into Agent system prompt architecture: Identity, …
Building AI Agents in Rust — The Tool-Calling Loop Explained
A deep dive into the core mechanism of AI agents: the tool-calling loop. Through a ~200-line Rust …
Sub-Agents vs Agent Teams: The Architecture Decision That Can Wreck Your System
The real question is how to choose between Sub-Agents and Agent Teams. Most people immediately think of …
Did Claude Opus 4.7 Secretly Raise Prices? 497 Developers Reveal the Truth
497 anonymous developer submissions reveal Claude Opus 4.7 consumes 37.3% more tokens than 4.6 on average, …
OpenAI Launches Codex Plugin for Claude Code: Letting Codex Do Code Reviews from Inside Enemy Territory
OpenAI released the Codex Plugin for Claude Code, letting you call Codex directly from within Claude Code for …
Building Complex Prompts from Scratch: The Seven-Element Framework
A complete guide to building complex prompts using the seven-element framework: Task Context, Tone, Rules, …
Teaching AI to Look Things Up: Claude Search & Retrieval Guide
Claude search and retrieval basics: Use the API to search Wikipedia, scrape web pages, and build personal …