Piston MCP Server
piston-mcp is an MCP server that allows LLMs to connect to and execute code using Piston.
[](https://github.com/alvii147/piston-mcp/actions) [](https://github.com/alvii147/piston-mcp/blob/main/LICENSE)
> [!WARNING]
> As of Feb 15, 2026, [Piston API](https://github.com/engineer-man/piston) is no longer publicly available and requires an authorization token. This means *piston-mcp* will no longer work with the publicly hosted instance of Piston.
## Installation
You can try out *piston-mcp* locally without cloning it.
### Install [uv](https://github.com/astral-sh/uv)
To try out *piston-mcp* you'll need to install `uv`:
```bash
# On MacOS and Linux
curl -LsSf https://astral.sh/uv/install.sh | sh
# On Windows
powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"
```
### Install MCP Client
You will also need to download an MCP client to connect to *piston-mcp*, such as [Claude Desktop](https://claude.ai/download).
### Update MCP Client Configuration
Update the MCP client's configuration with the following configuration to connect to *piston-mcp*:
```json
{
"mcpServers": {
"piston": {
"command": "uv",
"args": [
"tool",
"run",
"--from",
"git+https://github.com/alvii147/piston-mcp.git@main",
"piston_mcp"
]
}
}
}
```
For Claude Desktop, the configuration file is usually found in:
```bash
# On MacOS and Linux
~/Library/Application\ Support/Claude/claude_desktop_config.json
# On Windows
%APPDATA%\Claude\claude_desktop_config.json
```
## Usage
Once you've followed the steps above, your MCP client should be able to run code for you:
## Acknowledgements
* [Piston](https://github.com/engineer-man/piston)
* [Claude.ai](https://claude.ai/)