diff --git a/autogpt_platform/backend/backend/data/model.py b/autogpt_platform/backend/backend/data/model.py
index 57705006b4..4068bdcfa2 100644
--- a/autogpt_platform/backend/backend/data/model.py
+++ b/autogpt_platform/backend/backend/data/model.py
@@ -151,6 +151,15 @@ class CredentialsMetaInput(BaseModel, Generic[CP, CT]):
     type: CT
 
 
+class CredentialsFieldSchemaExtra(BaseModel, Generic[CP, CT]):
+    # TODO: move discrimination mechanism out of CredentialsField (frontend + backend)
+    credentials_provider: list[CP]
+    credentials_scopes: Optional[list[str]]
+    credentials_types: list[CT]
+    discriminator: Optional[str] = None
+    discriminator_mapping: Optional[dict[str, CP]] = None
+
+
 def CredentialsField(
     provider: CP | list[CP],
     supported_credential_types: set[CT],
@@ -166,24 +175,21 @@ def CredentialsField(
     `CredentialsField` must and can only be used on fields named `credentials`.
     This is enforced by the `BlockSchema` base class.
     """
-    json_extra = {
-        k: v
-        for k, v in {
-            "credentials_provider": (
-                [provider] if isinstance(provider, str) else provider
-            ),
-            "credentials_scopes": list(required_scopes) or None,  # omit if empty
-            "credentials_types": list(supported_credential_types),
-            "discriminator": discriminator,
-            "discriminator_mapping": discriminator_mapping,
-        }.items()
-        if v is not None
-    }
+    if not isinstance(provider, str) and len(provider) > 1 and not discriminator:
+        raise TypeError("Multi-provider CredentialsField requires discriminator!")
+
+    field_schema_extra = CredentialsFieldSchemaExtra[CP, CT](
+        credentials_provider=[provider] if isinstance(provider, str) else provider,
+        credentials_scopes=list(required_scopes) or None,  # omit if empty
+        credentials_types=list(supported_credential_types),
+        discriminator=discriminator,
+        discriminator_mapping=discriminator_mapping,
+    )
 
     return Field(
         title=title,
         description=description,
-        json_schema_extra=json_extra,
+        json_schema_extra=field_schema_extra.model_dump(exclude_none=True),
         **kwargs,
     )
 
diff --git a/autogpt_platform/frontend/package.json b/autogpt_platform/frontend/package.json
index 13eed379d1..e27a734496 100644
--- a/autogpt_platform/frontend/package.json
+++ b/autogpt_platform/frontend/package.json
@@ -10,6 +10,7 @@
     "start": "next start",
     "lint": "next lint && prettier --check .",
     "format": "prettier --write .",
+    "type-check": "tsc --noEmit",
     "test": "playwright test",
     "test-ui": "playwright test --ui",
     "gentests": "playwright codegen http://localhost:3000",
diff --git a/autogpt_platform/frontend/src/hooks/useCredentials.ts b/autogpt_platform/frontend/src/hooks/useCredentials.ts
index 7c26f1df6f..4136ae8791 100644
--- a/autogpt_platform/frontend/src/hooks/useCredentials.ts
+++ b/autogpt_platform/frontend/src/hooks/useCredentials.ts
@@ -45,8 +45,15 @@ export default function useCredentials(): CredentialsData | null {
       ]) ||
     null;
 
+  if (
+    !discriminatorValue &&
+    credentialsSchema.credentials_provider.length > 1
+  ) {
+    throw new Error("Multi-provider credential input requires discriminator!");
+  }
+
   const providerName =
-    discriminatorValue || credentialsSchema.credentials_provider;
+    discriminatorValue || credentialsSchema.credentials_provider[0];
   const provider = allProviders ? allProviders[providerName] : null;
 
   // If block input schema doesn't have credentials, return null
@@ -60,13 +67,14 @@ export default function useCredentials(): CredentialsData | null {
 
   // No provider means maybe it's still loading
   if (!provider) {
-    return {
-      provider: credentialsSchema.credentials_provider,
-      schema: credentialsSchema,
-      supportsApiKey,
-      supportsOAuth2,
-      isLoading: true,
-    };
+    // return {
+    //   provider: credentialsSchema.credentials_provider,
+    //   schema: credentialsSchema,
+    //   supportsApiKey,
+    //   supportsOAuth2,
+    //   isLoading: true,
+    // };
+    return null;
   }
 
   // Filter by OAuth credentials that have sufficient scopes for this block
diff --git a/autogpt_platform/frontend/src/lib/autogpt-server-api/types.ts b/autogpt_platform/frontend/src/lib/autogpt-server-api/types.ts
index cab4f834a5..1c0c278077 100644
--- a/autogpt_platform/frontend/src/lib/autogpt-server-api/types.ts
+++ b/autogpt_platform/frontend/src/lib/autogpt-server-api/types.ts
@@ -123,7 +123,8 @@ export type CredentialsProviderName =
   (typeof PROVIDER_NAMES)[keyof typeof PROVIDER_NAMES];
 
 export type BlockIOCredentialsSubSchema = BlockIOSubSchemaMeta & {
-  credentials_provider: CredentialsProviderName;
+  /* Mirror of backend/data/model.py:CredentialsFieldSchemaExtra */
+  credentials_provider: CredentialsProviderName[];
   credentials_scopes?: string[];
   credentials_types: Array<CredentialsType>;
   discriminator?: string;