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| title: README | |
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| # OpenVulcan | |
| **Open tools that let AI coding agents work fast without breaking things.** | |
| [Website](https://openvulcan.com) · [GitHub](https://github.com/OpenVulcan) | |
| </div> | |
| ## vulcan-decision-shell-v1 | |
| Small dedicated models that judge an AI coding agent's tool call before it runs: **allow**, **review** or **block**. | |
| Three sizes share one policy, one input format and the same three decisions. | |
| | Model | Size | Good for | | |
| | --- | ---: | --- | | |
| | [vulcan-decision-shell-v1](https://huggingface.co/openvulcan/vulcan-decision-shell-v1) | 0.75B | Best quality | | |
| | [vulcan-decision-shell-v1-flash](https://huggingface.co/openvulcan/vulcan-decision-shell-v1-flash) | 0.36B | Close to v1, faster | | |
| | [vulcan-decision-shell-v1-mini](https://huggingface.co/openvulcan/vulcan-decision-shell-v1-mini) | 0.2B | Machines short on memory or compute | | |
| - [vulcan-decision-shell-v1-runtime](https://huggingface.co/openvulcan/vulcan-decision-shell-v1-runtime): ONNX packages of all three for CUDA, WebGPU and CPU | |
| - [vulcan-decision-shell-v1-data](https://huggingface.co/datasets/openvulcan/vulcan-decision-shell-v1-data): training and validation banks | |
| ## Use it | |
| - **[Vulcan Decision Guard](https://github.com/OpenVulcan/vulcan-decision-guard)**: permission guard plugins for Claude Code and | |
| Codex. Every tool call is judged locally on ONNX or through OpenVulcan Cloud before it runs, and nothing is allowed | |
| when the judge cannot answer. | |
| - **VulcanCode**: our coding and work platform uses these models for automatic approval. | |
| The cloud decision model is free, permanently. | |
| --- | |
| OpenVulcan 为 AI 编码代理做开放工具：vulcan-decision-shell-v1 系列在工具调用执行前判定放行、复核或拦下， | |
| 三个尺寸同一套策略；[Vulcan Decision Guard](https://github.com/OpenVulcan/vulcan-decision-guard) 把它接入 Claude Code 与 Codex。 | |
| 云端判定模型永久免费。 | |