Types Are Memory for Your Codebase

Every meaningful codebase depends on shared memory. Humans remember what a function returns, agents infer what a payload probably contains, and teams hope that yesterday's assumption still holds when tomorrow's feature lands.

Types make that memory durable. They move expectations out of chat history, ticket comments, and individual developer heads, then put them somewhere the codebase can enforce.

Types Outlast Prompts

An agent can be told what shape data has, but a typed boundary keeps telling it. That matters when a session starts cold, a feature crosses module boundaries, or a generated patch touches code the prompt did not mention.

Schemas Are Product Decisions

Schemas and interfaces are not just implementation details. They name what the product believes to be true: what a customer is, which states an assessment can enter, which fields must exist before work can proceed, and which cases deserve explicit handling.

Better Context for Humans and Agents

Strong types do not make the system perfect. They make uncertainty visible. That is enough to change the workflow: failures happen earlier, assumptions are easier to review, and generated code has clearer rails to follow.