diff --git a/autogpt_platform/backend/backend/data/graph_test.py b/autogpt_platform/backend/backend/data/graph_test.py
index 1e4a2246a2..7a545cf11e 100644
--- a/autogpt_platform/backend/backend/data/graph_test.py
+++ b/autogpt_platform/backend/backend/data/graph_test.py
@@ -479,12 +479,14 @@ def test_mcp_credential_combine_different_servers():
     field_sentry = CredentialsFieldInfo(
         credentials_provider=frozenset([ProviderName.MCP]),
         credentials_types=frozenset(["oauth2"]),
+        credentials_scopes=None,
         discriminator="server_url",
         discriminator_values={"https://mcp.sentry.dev/mcp"},
     )
     field_linear = CredentialsFieldInfo(
         credentials_provider=frozenset([ProviderName.MCP]),
         credentials_types=frozenset(["oauth2"]),
+        credentials_scopes=None,
         discriminator="server_url",
         discriminator_values={"https://mcp.linear.app/mcp"},
     )
@@ -519,12 +521,14 @@ def test_mcp_credential_combine_same_server():
     field_a = CredentialsFieldInfo(
         credentials_provider=frozenset([ProviderName.MCP]),
         credentials_types=frozenset(["oauth2"]),
+        credentials_scopes=None,
         discriminator="server_url",
         discriminator_values={"https://mcp.sentry.dev/mcp"},
     )
     field_b = CredentialsFieldInfo(
         credentials_provider=frozenset([ProviderName.MCP]),
         credentials_types=frozenset(["oauth2"]),
+        credentials_scopes=None,
         discriminator="server_url",
         discriminator_values={"https://mcp.sentry.dev/mcp"},
     )
@@ -550,11 +554,13 @@ def test_mcp_credential_combine_no_discriminator_values():
     field_a = CredentialsFieldInfo(
         credentials_provider=frozenset([ProviderName.MCP]),
         credentials_types=frozenset(["oauth2"]),
+        credentials_scopes=None,
         discriminator="server_url",
     )
     field_b = CredentialsFieldInfo(
         credentials_provider=frozenset([ProviderName.MCP]),
         credentials_types=frozenset(["oauth2"]),
+        credentials_scopes=None,
         discriminator="server_url",
     )
 
diff --git a/autogpt_platform/backend/backend/executor/manager.py b/autogpt_platform/backend/backend/executor/manager.py
index b1daabd0ee..d58a9fae7c 100644
--- a/autogpt_platform/backend/backend/executor/manager.py
+++ b/autogpt_platform/backend/backend/executor/manager.py
@@ -277,6 +277,9 @@ async def execute_node(
             continue  # No credentials configured — block runs without
 
         credentials_meta = input_type(**field_value)
+        # Write normalized values back so JSON schema validation also passes
+        # (model_validator may have fixed legacy formats like "ProviderName.MCP")
+        input_data[field_name] = credentials_meta.model_dump(mode="json")
         credentials, lock = await creds_manager.acquire(user_id, credentials_meta.id)
         creds_locks.append(lock)
         extra_exec_kwargs[field_name] = credentials