This contract represents the entire agreement between the two parties and supersedes any previous written or oral agreement. A cooperation agreement is a contract between 2 parties who enter a working relationship.Use our free template to create yours. Learn what a letter of agreement is and how to write one, including a template and example to help you get started crafting your own. In this guide to business contracts, explore business contract templates and examples for small and growing businesses. Think of it as a detailed conversation in writing where you lay out exactly what each person or business will do, when, and how.