diff --git a/build.gradle b/build.gradle
index f82f7ef7575c..f7ac51fc415f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -41,6 +41,7 @@ buildscript {
     classpath 'com.palantir.gradle.revapi:gradle-revapi:1.7.0'
     classpath 'com.gorylenko.gradle-git-properties:gradle-git-properties:2.4.1'
     classpath 'com.palantir.gradle.gitversion:gradle-git-version:3.0.0'
+    classpath 'org.openapitools:openapi-generator-gradle-plugin:6.6.0'
   }
 }
 
@@ -523,6 +524,13 @@ project(':iceberg-aws') {
     classpath = sourceSets.integration.runtimeClasspath
     jvmArgs += project.property('extraJvmArgs')
   }
+
+  def s3SignerSpec = "$projectDir/src/main/resources/s3-signer-open-api.yaml"
+  tasks.register('validateS3SignerSpec', org.openapitools.generator.gradle.plugin.tasks.ValidateTask) {
+    inputSpec.set(s3SignerSpec)
+    recommend.set(true)
+  }
+  check.dependsOn('validateS3SignerSpec')
 }
 
 project(':iceberg-azure') {
@@ -954,6 +962,15 @@ project(':iceberg-snowflake') {
   }
 }
 
+project(':iceberg-open-api') {
+  def restCatalogSpec = "$projectDir/rest-catalog-open-api.yaml"
+  tasks.register('validateRESTCatalogSpec', org.openapitools.generator.gradle.plugin.tasks.ValidateTask) {
+    inputSpec.set(restCatalogSpec)
+    recommend.set(true)
+  }
+  check.dependsOn('validateRESTCatalogSpec')
+}
+
 @Memoized
 boolean versionFileExists() {
   return file('version.txt').exists()
diff --git a/open-api/rest-catalog-open-api.py b/open-api/rest-catalog-open-api.py
index cc70d6d4cd89..6225bf176929 100644
--- a/open-api/rest-catalog-open-api.py
+++ b/open-api/rest-catalog-open-api.py
@@ -419,7 +419,16 @@ class AssertDefaultSortOrderId(TableRequirement):
 
 
 class ViewRequirement(BaseModel):
-    __root__: Any = Field(..., discriminator='type')
+    type: str
+
+
+class AssertViewUUID(ViewRequirement):
+    """
+    The view UUID must match the requirement's `uuid`
+    """
+
+    type: Literal['assert-view-uuid']
+    uuid: str
 
 
 class RegisterTableRequest(BaseModel):
diff --git a/open-api/rest-catalog-open-api.yaml b/open-api/rest-catalog-open-api.yaml
index 0b008ace605d..473fa665a88a 100644
--- a/open-api/rest-catalog-open-api.yaml
+++ b/open-api/rest-catalog-open-api.yaml
@@ -2568,26 +2568,26 @@ components:
         propertyName: type
         mapping:
           assert-view-uuid: '#/components/schemas/AssertViewUUID'
-        type: object
-        required:
-          - type
-        properties:
-          type:
-            type: "string"
+      type: object
+      required:
+        - type
+      properties:
+        type:
+          type: "string"
 
-        AssertViewUUID:
-          allOf:
-            - $ref: "#/components/schemas/ViewRequirement"
-          description: The view UUID must match the requirement's `uuid`
-          required:
-            - type
-            - uuid
-          properties:
-            type:
-              type: string
-              enum: [ "assert-view-uuid" ]
-            uuid:
-              type: string
+    AssertViewUUID:
+      allOf:
+        - $ref: "#/components/schemas/ViewRequirement"
+      description: The view UUID must match the requirement's `uuid`
+      required:
+        - type
+        - uuid
+      properties:
+        type:
+          type: string
+          enum: [ "assert-view-uuid" ]
+        uuid:
+          type: string
 
     LoadTableResult:
       description: |
@@ -3251,12 +3251,12 @@ components:
         application/json:
           schema:
             $ref: '#/components/schemas/IcebergErrorResponse'
-            example: {
-              "error": {
-                "message": "The server does not support this operation",
-                "type": "UnsupportedOperationException",
-                "code": 406
-              } }
+          example: {
+            "error": {
+              "message": "The server does not support this operation",
+              "type": "UnsupportedOperationException",
+              "code": 406
+            } }
 
     CreateNamespaceResponse:
       description:
diff --git a/settings.gradle b/settings.gradle
index d2c64da78a36..9a220f7b169d 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -40,6 +40,7 @@ include 'gcp-bundle'
 include 'dell'
 include 'snowflake'
 include 'delta-lake'
+include 'open-api'
 
 project(':api').name = 'iceberg-api'
 project(':common').name = 'iceberg-common'
@@ -63,6 +64,7 @@ project(':gcp-bundle').name = 'iceberg-gcp-bundle'
 project(':dell').name = 'iceberg-dell'
 project(':snowflake').name = 'iceberg-snowflake'
 project(':delta-lake').name = 'iceberg-delta-lake'
+project(':open-api').name = 'iceberg-open-api'
 
 if (null != System.getProperty("allVersions")) {
   System.setProperty("flinkVersions", System.getProperty("knownFlinkVersions"))