Comment by w4der

Tcl's first "release" was in 1988 and Magic was released in 1984, but it seems like John Ousterhout then wrote Tcl to have a common interface across tools [https://web.stanford.edu/~ouster/cgi-bin/tclHistory.php]. It still is a big thing in EDA, because (in theory) it lets a chip designer run their designs by tools from different vendors