# CallerIdentity.sessionID

- **Module:** CallerIdentity
- **Package:** LibTmuxMCP
- **Language:** Swift
- **Kind:** property
- **Source:** https://github.com/libtmux/libtmux-swift/blob/254f8b2be7eb60cacc3ffcb3ea8e456784f582df/Sources/LibTmuxMCP/Caller.swift#L14
- **Page:** https://libtmux.org/en/swift/latest/mcp/reference/calleridentity-sessionid/

From `TMUX`, in the same `$…` spelling as a session id.