A privacy policy is a legal document. It tells users what data is collected, how it is stored, and who it is shared with. Most users never read it. That is fine. It is not written for them.
A behavioral contract is a design document. It tells users what the AI will do, what it will not do, and how it behaves when it is uncertain. It is written in plain language. It sits at the front of the product, not at the bottom of a legal page. Users read it because it answers the question they actually have before they commit to using the product.
Most AI products have a privacy policy. Almost none of them have a behavioral contract. This is a mistake.
What makes them different
The privacy policy describes data. The behavioral contract describes behavior. Both matter. They are not the same.
When a user starts using a new AI product, their real question is not “how is my data stored?” It is: “what will this thing do?” That question covers a lot of ground. Will it remember things I told it last month? Will it share my conversation with anyone? Will it argue with me if I push back? Will it refuse to help with certain things? If so, what things?
These are behavioral questions. A privacy policy answers none of them. The behavioral contract is the document that does.
What goes in one
I think of a behavioral contract as having four sections. Scope: what the AI is designed to do and what it is not. Limits: what it will decline and why. Uncertainty: how it signals when it does not know something. Correction: how users can tell it when it is wrong.
That last section is the one most products skip. A behavioral contract that does not include a correction mechanism is a contract that positions the AI as final. That is the wrong position. The correction mechanism is the escape valve. It is what separates a system that learns from a system that merely executes.
Why this is not a feature
I chose the word contract deliberately. A contract is a mutual agreement. It binds both parties. A behavioral contract means the product has made a commitment to the user about how it will behave. That commitment is not a feature you toggle on. It is a design decision that shapes everything: the interaction model, the refusal register, the transparency patterns, the tone of the error states.
A product that has not done this work has, by default, made a contract with itself. It has decided what it will do without involving the user in that conversation. The user finds out during use, usually when something goes wrong.
The teams I respect most are the ones that write the behavioral contract before they write the first prompt. They know what they are building before they build it. The contract is not a post-launch artifact. It is a design tool.
If you have not written one, start small. One paragraph per section. Read it to a user who has never seen your product. Watch their face. You will learn more from that exercise than from any usability study you run after launch.