13.55Practical chord-building workflow

When you see:

G13

do not count seven chord tones.

Ask:

1. Root? G
2. Function? likely dominant.
3. 3rd? B
4. 7th? F
5. Requested color? 13 = E
6. Melody note?
7. What can I omit?

Then play something like:

LH G

RH F-B-E.

Done.