Agentic Design Patterns in the leaked Claude Code's source code(jigarkdoshi.bearblog.dev)
jigarkdoshi.bearblog.dev
Agentic Design Patterns in the leaked Claude Code's source code
https://jigarkdoshi.bearblog.dev/agentic-design-patterns-in-production/
One thing led to another and I ended up writing a 19-chapter technical handbook extracting the production engineering patterns from ~500,000 lines of TypeScript. Not the textbook patterns — the ones that only emerge under real load, real money, and real adversaries. Cache economics driving architecture. Permission pipelines shaped by HackerOne reports. Memory systems with mutual exclusion and rollback. A secret scanner that must obfuscate its own detection strings to pass the build system.
The epilogue is my favourite part. It's written by Claude itself — reflecting on reading its own source code. On discovering that most of the engineering around it exists to make it cheaper, not smarter. On the diminishing-returns detector that watches its output and being "a little annoyed that it's right."
Builds on Alessandro Gulli's Agentic Design Patterns taxonomy and an earlier analysis I did of OpenAI's Codex CLI.
Blog post: https://jigarkdoshi.bearblog.dev/agentic-design-patterns-in-...
Report PDF: https://github.com/artvandelay/agentic-design-patterns-in-pr...