Show HN: Open-agent-SDK – Claude Code's internals, extracted and open-sourced
Show HN (score: 5)
Found: April 02, 2026
ID: 3998
Description
API/SDK
Show HN: Open-agent-SDK – Claude Code's internals, extracted and open-sourced
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, done
MIT licensed — fork it, patch it, make it yours
More from Show
No other tools from this source yet.