I tried this recently and found the token overhead makes it prohibitive for any non-trivial schema. Dumping the full introspection result into the context window gets expensive fast and seems to increase hallucination rates compared to just providing specific, narrow tool definitions.

a friend (and colleague, disclaimer) pushed this recently to github. It passes data through a duck fb layer exactly to avoid context bloat:

https://github.com/agoda-com/api-agent

worth taking a look to see multiple approaches to the problem