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Hugging Face co-founder Julien Chaumond releases SynthTraces, a minimal codebase for generating synthetic coding agent session traces

The tool uses llama.cpp to simulate human-agent interactions.

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Julien Chaumond@julien_c#253inAI

Today I'm launching a new project called SynthTraces 🔥

It is a minimal codebase to generate synthetic coding agent session traces using Pi (from @badlogicgames)

I wanted a large number of coding-agent traces, so I built a tiny harness where two models talk to each other:

- an open model (served via HF Inference Providers) plays the coding agent. It gets read + bash access to a real open source codebase (the huggingface OSS projects) - a small local model (llama.cpp) plays the human user, asking simple questions like "how do I run this?" or "how is CI set up?"

The result is more than 2,000 Pi session traces which can be used to train or fine-tune LLMs, and optimize them for Pi 🤯

And ofc everything is published on @huggingface ✅

6:18 AM · Jun 4, 2026 · 14.2K Views
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Suzana Ilić@suzatweet

@julien_c @huggingface @badlogicgames Very cool!

Today I'm launching a new project called SynthTraces 🔥

It is a minimal codebase to generate synthetic coding agent session traces using Pi (from @badlogicgames)

I wanted a large number of coding-agent traces, so I built a tiny harness where two models talk to each other:

- an open model (served via HF Inference Providers) plays the coding agent. It gets read + bash access to a real open source codebase (the huggingface OSS projects) - a small local model (llama.cpp) plays the human user, asking simple questions like "how do I run this?" or "how is CI set up?"

The result is more than 2,000 Pi session traces which can be used to train or fine-tune LLMs, and optimize them for Pi 🤯

And ofc everything is published on @huggingface ✅

1hViews 204Likes 0Bookmarks 0
RETWEETS6

Today I'm launching a new project called SynthTraces 🔥

It is a minimal codebase to generate synthetic coding agent session traces using Pi (from @badlogicgames)

I wanted a large number of coding-agent traces, so I built a tiny harness where two models talk to each other:

- an open model (served via HF Inference Providers) plays the coding agent. It gets read + bash access to a real open source codebase (the huggingface OSS projects) - a small local model (llama.cpp) plays the human user, asking simple questions like "how do I run this?" or "how is CI set up?"

The result is more than 2,000 Pi session traces which can be used to train or fine-tune LLMs, and optimize them for Pi 🤯

And ofc everything is published on @huggingface ✅

2hViews 14.2KLikes 161Bookmarks 88
Hugging Face co-founder Julien Chaumond releases SynthTraces, a minimal codebase for generating synthetic coding agent session traces · Digg