# mcp.policy.Builder.build

- **Module:** mcp.policy.Builder
- **Package:** tmux-mcp
- **Language:** Rust
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-rs/blob/f0e37052c232636b61d095817046e6bfc8f2ca40/crates/tmux-mcp/src/policy.rs#L401
- **Page:** https://libtmux.org/en/rs/latest/mcp/reference/mcp-policy-builder-build/

```
mcp.policy.Builder.build(self) -> TmuxTools
```

Build the server with its startup-frozen tool selection.

# Panics

Panics if native tool metadata violates the capability contract.