diff --git a/platform/api.yml b/platform/api.yml
index 23acaa6a..67a1c69a 100644
--- a/platform/api.yml
+++ b/platform/api.yml
@@ -588,6 +588,8 @@ paths:
     $ref: "./paths/infrastructure/external-volumes/external-volumes.yml"
   "/v1/infrastructure/external-volumes/{externalVolumeId}":
     $ref: "./paths/infrastructure/external-volumes/external-volume.yml"
+  "/v1/infrastructure/external-volumes/sources":
+    $ref: "./paths/infrastructure/external-volumes/sources.yml"
   "/v1/infrastructure/external-volumes/{externalVolumeId}/access":
     $ref: "./paths/infrastructure/external-volumes/access.yml"
   "/v1/infrastructure/external-volumes/{externalVolumeId}/tasks":
diff --git a/platform/paths/infrastructure/external-volumes/sources.yml b/platform/paths/infrastructure/external-volumes/sources.yml
new file mode 100644
index 00000000..505ca77e
--- /dev/null
+++ b/platform/paths/infrastructure/external-volumes/sources.yml
@@ -0,0 +1,37 @@
+get:
+  operationId: "getExternalVolumeSources"
+  summary: List External Volume Sources
+  description: Requires the `external-volumes-view` capability.
+  tags:
+    - External Volumes
+  responses:
+    200:
+      description: Returns supported external volume sources and their capabilities.
+      content:
+        application/json:
+          schema:
+            type: object
+            required:
+              - data
+            properties:
+              data:
+                type: object
+                additionalProperties:
+                  type: object
+                  title: ExternalVolumeSource
+                  required:
+                    - capabilities
+                    - creatable
+                  properties:
+                    capabilities:
+                      type: object
+                      description: Map where keys are attachment types and values are arrays of supported modes.
+                      additionalProperties:
+                        type: array
+                        items:
+                          type: string
+                    creatable:
+                      type: boolean
+                      description: Whether volumes of this source type can be created via the API.
+    default:
+      $ref: ../../../../components/responses/errors/DefaultError.yml
diff --git a/platform/paths/pipelines/triggerKeys/triggerKey.yml b/platform/paths/pipelines/triggerKeys/triggerKey.yml
index 4d53af0a..e486e5fa 100644
--- a/platform/paths/pipelines/triggerKeys/triggerKey.yml
+++ b/platform/paths/pipelines/triggerKeys/triggerKey.yml
@@ -75,7 +75,7 @@ patch:
               - data
             properties:
               data:
-                $ref: ../../../../components/schemas/jobs/JobDescriptor.yml
+                $ref: ../../../../components/schemas/pipelines/trigger-keys/TriggerKey.yml
     default:
       $ref: ../../../../components/responses/errors/DefaultError.yml