Who wrote the toy story screenplay?

Quick Answer
The screenplay for Toy Story 5 was written by Andrew Stanton and Kenna Harris.
Explanation
The fifth installment of the Toy Story series, Toy Story 5, was written by Andrew Stanton and Kenna Harris. Andrew Stanton, who also directed the film, is a long‑time Pixar animator and writer known for his work on numerous animated features. Kenna Harris contributed to the screenplay, collaborating with Stanton to develop the story and dialogue for the film’s characters, including Jessie, Woody, Buzz Lightyear, and others. Their partnership produced the narrative that follows the toys as they navigate new challenges two years after the events of Toy Story 4. The screenplay was crafted to maintain the franchise’s blend of humor and emotional depth while introducing fresh elements such as a tablet device named Lilypad.