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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→ https://github.com/codeany-ai/open-agent-sdk-typescript
Show HN: Open-agent-SDK – Claude Code's internals, extracted and open-sourced
A superior, open-source, cloud-native alternative to claude-agent-sdk, addressing its black-box nature and inefficient process spawning for concurrent cloud operations.
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A superior, open-source, cloud-native alternative to claude-agent-sdk, addressing its black-box nature and inefficient process spawning for concurrent cloud operations.
This project directly addresses critical developer pain points within the AI agent ecosystem, specifically around claude-agent-sdk's limitations. The 'black box' nature and inefficient process spawning for cloud deployments are significant barriers to scaling and debugging. Open-agent-SDK's positioning as a 'drop-in replacement' with 'pure function calls' and 'cloud-native' design offers immediate value: improved performance, transparency, and maintainability for developers building AI applications. The MIT license fosters community contribution and customization, accelerating innovation. This highlights a broader trend: the demand for open, performant, and cloud-optimized tooling in the rapidly evolving AI/ML development landscape, moving away from opaque, resource-intensive proprietary wrappers.
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