I have always taught that when the FISO states "at your discretion" that you should give your intention,i.e. "landing/touch and go" or "Taking off" as appropriate.
For Departure - Yes. For Landing - No
The reason:
When an aircraft calls Final the correct response from a FISO is not "at your discretion" it should be "Land at your discretion" or "Touch and Go at your discretion".
To ensure awareness for all, I would state my intentions again if the FISO had given me "Land at your discretion" but I was actually intending to do a Touch and Go.
The only call required from an aircraft on Final is "Final"; but that doesn't stop a pilot from adding information if they deem it would be helpful to others also using the airfield.
EG:
G-XY Final
G-XY Final 3 miles (so others know where to look)
G-XY Final Runway 21 (if there is any possibility of confusion about which runway G-XY is intending to land on).
G-XY Final Land or G-XY Final Touch and Go (so the FISO knows what their correct response should be)