If my opponent has Tool Jammer activated, do I discard any of my attached Technical Machines at the end of my turn or not?
The discard text on Technical Machine tools is an effect, so the tool is not discarded at the end of the turn.
Source: TPCi Rules Team (2023-12-14)

Relevant cards

Note: All applicable cards may not be listed below.
SWSH5_136
SWSH5_136
SV4_176
SV4_176
SV4_177
SV4_177
SV4_178
SV4_178
SV4_179
SV4_179