I was backend lead at Manus. After building agents for 2 years, I stopped using function calling entirely. Here’s what I use instead. : r/LocalLLaMA

I was a backend lead at Manus before the Meta acquisition. I’ve spent the last 2 years building AI agents — first at Manus, then on my own open-source agent runtime (Pinix) and agent (agent-clip). Along the way I came to a conclusion that surprised me:

A single run(command="…") tool with Unix-style commands outperforms a catalog of typed function calls.

Here’s what I learned.

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