# ToolArgument.defaultValue

- **Module:** ToolArgument
- **Package:** LibTmuxMCP
- **Language:** Swift
- **Kind:** property
- **Source:** https://github.com/libtmux/libtmux-swift/blob/254f8b2be7eb60cacc3ffcb3ea8e456784f582df/Sources/LibTmuxMCP/ToolCatalog.swift#L107
- **Page:** https://libtmux.org/en/swift/latest/mcp/reference/toolargument-defaultvalue/

What the tool does when the argument is omitted, stated in the schema so a caller need not send it to find out.