# mcp.policy.ENVIRONMENT_VALUES_ENV

- **Module:** mcp.policy
- **Package:** tmux-mcp
- **Language:** Rust
- **Kind:** constant
- **Source:** https://github.com/libtmux/libtmux-rs/blob/f0e37052c232636b61d095817046e6bfc8f2ca40/crates/tmux-mcp/src/policy.rs#L32
- **Page:** https://libtmux.org/en/rs/latest/mcp/reference/mcp-policy-environment_values_env/

The tmux environment variables whose values tools may return.