Open-agent-SDK, an open-source, cloud-native drop-in replacement for claude-agent-sdk, extracting Claude Code's core agent loop logic.

Claude Code's source map leaked last month. Instead of just reading it, I fed the entire source into Claude Code itself and asked it to extract the core agent loop logic.The result: open-agent-sdk — a drop-in replacement for claude-agent-sdk that's fully open source and doesn't spawn a CLI subprocess.Why this matters if you've built with claude-agent-sdk:claude-agent-sdk is just a thin wrapper around the Claude Code binary. It works, but it's a black box — when something breaks, you're stuck.Every query creates a new Claude Code process. That's fine on a laptop, not fine when you're running thousands of concurrent agents in the cloud.What open-agent-sdk does differently:Pure function calls, no CLI process spawning — cloud-native from day one
Fully compatible interface with claude-agent-sdk — swap the package name, doneMIT licensed — fork it, patch it, make it yours→ github.com/codeany-ai/open-a...