diff --git a/src/query/utils.ts b/src/query/utils.ts
index 40c9ddf..66c2614 100644
--- a/src/query/utils.ts
+++ b/src/query/utils.ts
@@ -22,7 +22,7 @@ import { Err, Ok, type Result, resolve } from "../result/index.js";
  * @template TData - The type of data returned by the query (after select transform)
  * @template TQueryKey - The type of the query key
  */
-export type DefineQueryInput<
+type DefineQueryInput<
 	TQueryFnData = unknown,
 	TError = DefaultError,
 	TData = TQueryFnData,
@@ -69,7 +69,7 @@ export type DefineQueryInput<
  * const query = useQuery(userQuery.options); // React
  * ```
  */
-export type DefineQueryOutput<
+type DefineQueryOutput<
 	TQueryFnData = unknown,
 	TError = DefaultError,
 	TData = TQueryFnData,
@@ -99,7 +99,7 @@ export type DefineQueryOutput<
  * @template TVariables - The type of variables passed to the mutation
  * @template TContext - The type of context data for optimistic updates
  */
-export type DefineMutationInput<
+type DefineMutationInput<
 	TData,
 	TError,
 	TVariables = void,
@@ -140,7 +140,7 @@ export type DefineMutationInput<
  * const mutation = useMutation(createUser.options); // React
  * ```
  */
-export type DefineMutationOutput<
+type DefineMutationOutput<
 	TData,
 	TError,
 	TVariables = void,
diff --git a/src/result/result.ts b/src/result/result.ts
index 35a7b54..affe2d7 100644
--- a/src/result/result.ts
+++ b/src/result/result.ts
@@ -95,34 +95,6 @@ export const Ok = <T>(data: T): Ok<T> => ({ data, error: null });
  */
 export const Err = <E>(error: E): Err<E> => ({ error, data: null });
 
-/**
- * Utility type to extract the `Ok<T>` variant from a `Result<T, E>` union type.
- *
- * If `R` is a `Result` type (e.g., `Result<string, Error>`), this type will resolve
- * to `Ok<string>`. This can be useful in generic contexts or for type narrowing.
- *
- * @template R - The `Result<T, E>` union type from which to extract the `Ok<T>` variant.
- *             Must extend `Result<unknown, unknown>`.
- */
-export type ExtractOkFromResult<R extends Result<unknown, unknown>> = Extract<
-	R,
-	{ error: null }
->;
-
-/**
- * Utility type to extract the `Err<E>` variant from a `Result<T, E>` union type.
- *
- * If `R` is a `Result` type (e.g., `Result<string, Error>`), this type will resolve
- * to `Err<Error>`. This can be useful in generic contexts or for type narrowing.
- *
- * @template R - The `Result<T, E>` union type from which to extract the `Err<E>` variant.
- *             Must extend `Result<unknown, unknown>`.
- */
-export type ExtractErrFromResult<R extends Result<unknown, unknown>> = Extract<
-	R,
-	{ data: null }
->;
-
 /**
  * Utility type to extract the success value's type `T` from a `Result<T, E>` type.
  *
diff --git a/src/standard-schema/index.ts b/src/standard-schema/index.ts
index 557aa79..ab89659 100644
--- a/src/standard-schema/index.ts
+++ b/src/standard-schema/index.ts
@@ -5,7 +5,6 @@ export { ResultSchema, type Result } from "./result.js";
 export {
 	hasJsonSchema,
 	hasValidate,
-	type StandardFullSchemaV1,
 	type StandardJSONSchemaV1,
 	type StandardSchemaV1,
 	type StandardTypedV1,
diff --git a/src/standard-schema/types.ts b/src/standard-schema/types.ts
index def08cc..63111b7 100644
--- a/src/standard-schema/types.ts
+++ b/src/standard-schema/types.ts
@@ -192,18 +192,6 @@ export declare namespace StandardJSONSchemaV1 {
 		StandardTypedV1.InferOutput<Schema>;
 }
 
-// ###############################
-// ###   Utility Types         ###
-// ###############################
-
-/**
- * A schema that implements both StandardSchemaV1 and StandardJSONSchemaV1.
- */
-export type StandardFullSchemaV1<Input = unknown, Output = Input> = {
-	readonly "~standard": StandardSchemaV1.Props<Input, Output> &
-		StandardJSONSchemaV1.Props<Input, Output>;
-};
-
 /**
  * Checks if a schema has validation capability.
  */