# libtmux_mcp.middleware.ToolsetMiddleware.on_call_tool

- **Module:** libtmux_mcp.middleware.ToolsetMiddleware
- **Package:** libtmux-mcp
- **Language:** Python
- **Kind:** method
- **Source:** https://github.com/tmux-python/libtmux-mcp/blob/4daddc0dfca96c43bf521d818bf91564e1434760/src/libtmux_mcp/middleware.py#L140
- **Page:** https://libtmux.org/en/py/latest/mcp/reference/libtmux_mcp-middleware-toolsetmiddleware-on_call_tool/

```
libtmux_mcp.middleware.ToolsetMiddleware.on_call_tool(self, context: MiddlewareContext, call_next: t.Any) -> t.Any
```

Refuse a tool outside the enabled surface.