diff --git a/components/renku_data_services/connected_services/api.spec.yaml b/components/renku_data_services/connected_services/api.spec.yaml
index 7b235b882..c422d5dc4 100644
--- a/components/renku_data_services/connected_services/api.spec.yaml
+++ b/components/renku_data_services/connected_services/api.spec.yaml
@@ -412,12 +412,15 @@ components:
         setting up a GitHub App.
       type: string
       example: "my-application"
+      maxLength: 500
     ClientId:
       description: |
         Client ID or Application ID value. This is provided by
         the Resource Server when setting up a new OAuth2 Client.
       type: string
       example: "some-client-id"
+      minLength: 1
+      maxLength: 99
     ClientSecret:
       description: |
         Client secret provided by the Resource Server when setting
@@ -427,6 +430,8 @@ components:
     DisplayName:
       type: string
       example: "my oauth2 application"
+      minLength: 1
+      maxLength: 99
     ApiScope:
       type: string
       example: "api"
diff --git a/components/renku_data_services/connected_services/apispec.py b/components/renku_data_services/connected_services/apispec.py
index bac27d378..d3230a8be 100644
--- a/components/renku_data_services/connected_services/apispec.py
+++ b/components/renku_data_services/connected_services/apispec.py
@@ -1,6 +1,6 @@
 # generated by datamodel-codegen:
 #   filename:  api.spec.yaml
-#   timestamp: 2025-03-19T10:21:11+00:00
+#   timestamp: 2025-05-19T08:21:49+00:00
 
 from __future__ import annotations
 
@@ -97,18 +97,23 @@ class Provider(BaseAPISpec):
         ...,
         description="URL-friendly name of the application. This field only applies to\nGitHub Applications. The slug is provided by GitHub when\nsetting up a GitHub App.\n",
         examples=["my-application"],
+        max_length=500,
     )
     client_id: str = Field(
         ...,
         description="Client ID or Application ID value. This is provided by\nthe Resource Server when setting up a new OAuth2 Client.\n",
         examples=["some-client-id"],
+        max_length=99,
+        min_length=1,
     )
     client_secret: Optional[str] = Field(
         None,
         description="Client secret provided by the Resource Server when setting\nup a new OAuth2 Client.\n",
         examples=["some-client-secret"],
     )
-    display_name: str = Field(..., examples=["my oauth2 application"])
+    display_name: str = Field(
+        ..., examples=["my oauth2 application"], max_length=99, min_length=1
+    )
     scope: str = Field(..., examples=["api"])
     url: str = Field(
         ...,
@@ -136,18 +141,23 @@ class ProviderPost(BaseAPISpec):
         None,
         description="URL-friendly name of the application. This field only applies to\nGitHub Applications. The slug is provided by GitHub when\nsetting up a GitHub App.\n",
         examples=["my-application"],
+        max_length=500,
     )
     client_id: str = Field(
         ...,
         description="Client ID or Application ID value. This is provided by\nthe Resource Server when setting up a new OAuth2 Client.\n",
         examples=["some-client-id"],
+        max_length=99,
+        min_length=1,
     )
     client_secret: Optional[str] = Field(
         None,
         description="Client secret provided by the Resource Server when setting\nup a new OAuth2 Client.\n",
         examples=["some-client-secret"],
     )
-    display_name: str = Field(..., examples=["my oauth2 application"])
+    display_name: str = Field(
+        ..., examples=["my oauth2 application"], max_length=99, min_length=1
+    )
     scope: str = Field(..., examples=["api"])
     url: str = Field(
         ...,
@@ -155,7 +165,7 @@ class ProviderPost(BaseAPISpec):
         examples=["https://example.org"],
     )
     use_pkce: Optional[bool] = Field(
-        None,
+        False,
         description="Whether or not to use PKCE during authorization flows.\n",
         examples=[False],
     )
@@ -170,18 +180,23 @@ class ProviderPatch(BaseAPISpec):
         None,
         description="URL-friendly name of the application. This field only applies to\nGitHub Applications. The slug is provided by GitHub when\nsetting up a GitHub App.\n",
         examples=["my-application"],
+        max_length=500,
     )
     client_id: Optional[str] = Field(
         None,
         description="Client ID or Application ID value. This is provided by\nthe Resource Server when setting up a new OAuth2 Client.\n",
         examples=["some-client-id"],
+        max_length=99,
+        min_length=1,
     )
     client_secret: Optional[str] = Field(
         None,
         description="Client secret provided by the Resource Server when setting\nup a new OAuth2 Client.\n",
         examples=["some-client-secret"],
     )
-    display_name: Optional[str] = Field(None, examples=["my oauth2 application"])
+    display_name: Optional[str] = Field(
+        None, examples=["my oauth2 application"], max_length=99, min_length=1
+    )
     scope: Optional[str] = Field(None, examples=["api"])
     url: Optional[str] = Field(
         None,
@@ -189,7 +204,7 @@ class ProviderPatch(BaseAPISpec):
         examples=["https://example.org"],
     )
     use_pkce: Optional[bool] = Field(
-        None,
+        False,
         description="Whether or not to use PKCE during authorization flows.\n",
         examples=[False],
     )