Just a note, I had good results for this kind of thing by simply pointing the LLM at the URL where the API is defined or documented. In this case you would tell it the URL of the party in the Guide section of this forum. It will the read the instructions from there and learn the syntax.
So…
Read the URL Workout builder and build an interval workout with 2km of warmup and cool down, and 10 400m intervals with 2 minute pause. Use power to set the intensity.
→
Warm-Up
- 10m 60% FTP
Main Set 10x
- 400 m 105% FTP
- 2m 60% FTP
Cool-Down
- 10m 60% FTP
As you can immediately see it still hallucinates and the workout generated is wrong, but a starting point nevertheless. The syntax is correct at least.