# Infini-AI-Lab releases hermit Open-Source harness adapter framework

Digest AI · Agents & Tools · published 2026-10-29T08:24:52Z

Canonical: https://digestai.news/story/infini-ai-lab-releases-hermit-open-source-harness-adapter-framework

## Summary

infini-ai-lab announced the open‑source hermit framework on oct 25 2026, with the first version v0.1.0 available via pip install hermit-harness. cmu postdoc haizhong zheng promoted the release on x on oct 27, describing hermit as a way to train an external “harness adapter” while keeping the agent’s model and harness frozen.

the framework supports five evolution methods—gepa, skillopt, metaworld model (mwm), harness² and continual harness—with ace and reharness slated for later. benchmark results, all self‑reported from the repo’s readmes, show mwm reaching 0.795 accuracy on cl‑bench database exploration versus a 0.580 in‑context baseline, and a +7.6‑point gain for harness² on officeqa with a 95 % interval of +1.7 to +13.4. other scores include 3.08 big blinds per hand for mwm on exploitable poker and 45.3 on hidden‑policy tests in servelearnbench.

hermit runs on any api backend or local vllm, sglang or ollama server, and can deploy adapters to codex, claude code or pi, or export them as plugins. the authors note that most results are single runs and self‑reported, and that the base model and harness never change, aiming to keep closed‑source harnesses stable while enabling reusable adapters.

## Key points

- hermit v0.1.0 released oct 25 2026, install via pip install hermit-harness
- mwm adapter reaches 0.795 accuracy on cl‑bench, versus 0.580 baseline
- benchmark gains are self‑reported single runs using glm 5.3 flash

## Why it matters

hermit lets developers adapt existing AI agents without fine‑tuning the model or altering the harness, lowering compute costs and speeding up deployment of task‑specific agents.

## Sources

1. [Infini-AI-Lab Releases Hermit, an Open-Source Harness Adapter Framework for AI Agents](https://marktechpost.com/2026/10/29/infini-ai-lab-hermit-harness-adapter-framework) (MarkTechPost, 2026-10-29)

## Cite

Digest AI, "Infini-AI-Lab releases hermit Open-Source harness adapter framework", 29 October 2026, https://digestai.news/story/infini-ai-lab-releases-hermit-open-source-harness-adapter-framework

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