You may know some of the advantages of co-writing:
Get out o the comfort zone. It could be an adventure.
Experiment with new styles. Expand beyond the usual.
Highlight strengths and strengthen weak points.
Finish the song faster - two heads are better than one.
Wow! Did we just write that?
Inspire yourself and others.
I'm a creative catalyst with songwriting tools:
Spontaneity and open to surprizes and noticing that some mistakes are golden.
Tenacious exploring and curiosity.
Encouragement by keeping a positive outlook.
Listening carefully and bring out the best of what you want to say.
Education and experience.