add-malli-schemas

Add Malli schemas to API endpoints by defining schemas for route parameters, query parameters, request bodies, and responses using the `ms` namespace types. Attach schemas to endpoint macros, then test by invoking the endpoint to verify validation works correctly.

Route parameters require schemas directly. Query parameters should include `:optional true` and `:default` where appropriate. Use existing `ms` namespace types when possible, and consider named schemas for reusable or complex types.

Request bodies require a schema for POST and PUT operations. Response schemas are defined using `:-` after the route string. Both leverage existing schema types from the `ms` namespace to maintain consistency.

Yes. Create named schemas for types used across multiple endpoints. Named schemas enable consistency, reduce duplication, and simplify maintenance across the Metabase API codebase.

Add contextual error messages for validation failures to provide clear feedback when schema validation fails. This improves debugging and user experience across API endpoints.

Yes. Malli schemas integrate directly with Metabase endpoint macros. Attach schemas and test by invoking endpoints; validation timing and error handling follow real-world endpoint patterns in the codebase.