"ToolAlias provides a mechanism for rerouting specific programs to other programs. For example, with ToolAlias, you could reroute all references to ':c/muchmore' to use instead 'sys:utilities/ppmore', so that when browsing documents on a Fish disk, you get to use your favourite text viewer, rather than loading the one specified in the document's ToolTypes."
FYI, the ToolAlias function is built into MCP. :-o