Parameters must always possess a schema to help define the format and shape of the parameter, setting expections with consumers about what should be passed in
OpenAPI Components Parameters Schema Error
Message: Parameters MUST Have Schema
Policies
Parameter Schema
Schema definitions on parameters give you type safety and validation. Referencing shared schemas keeps things consistent and makes governance rules easier to apply.
Centralizing Parameters Using Components
Centralizing parameters in OpenAPI components is how you stop repeating yourself. Define a parameter once, reference it everywhere, and governance gets simpler.