I think you missing the problem with composition itself. The tool generation is the easy part. Knowing which tool is needed, specifying it correctly, validating it against current context, knowing why it failed, and deciding when it needs replacement are separate tasks, and they compose, and composition compounds and fails.

I've never found that to be a problem (using codex since the beginning of the year and having it make dozens of shell scripts for itself). It adds usage/help without me ever having had to ask, and if the tool has an issue, I've found it will generally debug and fix it on its own.