diff --git a/packages/ccdi-openapi/src/api.rs b/packages/ccdi-openapi/src/api.rs
index 9724289..d5143c5 100644
--- a/packages/ccdi-openapi/src/api.rs
+++ b/packages/ccdi-openapi/src/api.rs
@@ -88,6 +88,9 @@ a variety of query parameters.",
 
         // Models.
         models::Subject,
+        models::metadata::field::Description,
+        models::metadata::field::description::Harmonized,
+        models::metadata::field::description::Unharmonized,
         models::subject::Kind,
         models::subject::Metadata,
 
@@ -98,6 +101,8 @@ a variety of query parameters.",
         responses::Error,
         responses::Subject,
         responses::Subjects,
+        responses::by::count::Subjects,
+        responses::metadata::FieldDescriptions
     )),
     modifiers(&RemoveLicense)
 )]
diff --git a/packages/ccdi-server/src/responses/by/count.rs b/packages/ccdi-server/src/responses/by/count.rs
index 00dc083..2a277e7 100644
--- a/packages/ccdi-server/src/responses/by/count.rs
+++ b/packages/ccdi-server/src/responses/by/count.rs
@@ -7,14 +7,13 @@ use utoipa::ToSchema;
 
 use ccdi_models as models;
 
-use models::count::Total;
-
 /// A response for grouping [`Subject`](models::Subject)s by a metadata field
 /// and then summing the counts.
 #[derive(Debug, Deserialize, Serialize, ToSchema)]
+#[schema(as = responses::by::count::Subjects)]
 pub struct Subjects {
     #[serde(flatten)]
-    total: Total,
+    total: models::count::Total,
 
     values: IndexMap<String, usize>,
 }
@@ -44,7 +43,7 @@ impl From<IndexMap<String, usize>> for Subjects {
     fn from(values: IndexMap<String, usize>) -> Self {
         let total = values.values().sum::<usize>();
         Self {
-            total: Total::from(total),
+            total: models::count::Total::from(total),
             values,
         }
     }
diff --git a/packages/ccdi-server/src/routes/metadata.rs b/packages/ccdi-server/src/routes/metadata.rs
index 4af7102..58da080 100644
--- a/packages/ccdi-server/src/routes/metadata.rs
+++ b/packages/ccdi-server/src/routes/metadata.rs
@@ -25,7 +25,7 @@ pub fn configure() -> impl FnOnce(&mut ServiceConfig) {
     path = "/metadata/fields/subject",
     tag = "Metadata",
     responses(
-        (status = 200, description = "Successful operation.", body = [responses::Subjects])
+        (status = 200, description = "Successful operation.", body = responses::metadata::FieldDescriptions)
     )
 )]
 #[get("/metadata/fields/subject")]
diff --git a/packages/ccdi-server/src/routes/subject.rs b/packages/ccdi-server/src/routes/subject.rs
index 823502c..507a5ae 100644
--- a/packages/ccdi-server/src/routes/subject.rs
+++ b/packages/ccdi-server/src/routes/subject.rs
@@ -137,7 +137,7 @@ pub async fn show(path: Path<(String, String)>, subjects: Data<Store>) -> impl R
     ),
     tag = "Subject",
     responses(
-        (status = 200, description = "Successful operation.", body = responses::Subject),
+        (status = 200, description = "Successful operation.", body = responses::by::count::Subjects),
         (
             status = 422,
             description = "Unsupported field.",
diff --git a/swagger.yml b/swagger.yml
index fa6c7f1..d7d687e 100644
--- a/swagger.yml
+++ b/swagger.yml
@@ -32,9 +32,7 @@ paths:
           content:
             application/json:
               schema:
-                type: array
-                items:
-                  $ref: '#/components/schemas/responses.Subjects'
+                $ref: '#/components/schemas/responses.metadata.FieldDescriptions'
   /subject:
     get:
       tags:
@@ -104,7 +102,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: '#/components/schemas/responses.Subject'
+                $ref: '#/components/schemas/responses.by.count.Subjects'
         '422':
           description: Unsupported field.
           content:
@@ -363,6 +361,86 @@ components:
           type: integer
           description: The total number of entities returned in the API call.
           minimum: 0
+    models.metadata.field.Description:
+      oneOf:
+      - $ref: '#/components/schemas/models.metadata.field.description.Harmonized'
+      - $ref: '#/components/schemas/models.metadata.field.description.Unharmonized'
+      description: A description for a metadata field.
+    models.metadata.field.description.Harmonized:
+      type: object
+      description: A harmonized metadata field description.
+      required:
+      - harmonized
+      - path
+      - standard
+      - url
+      properties:
+        harmonized:
+          type: boolean
+          description: |-
+            Whether or not this field is harmonized across the ecosystem.
+
+            This will always be set to `true`.
+          default: true
+        path:
+          type: string
+          description: |-
+            A comma (`.`) delimited path to the field's location on the `metadata`
+            objects returned by the various subject endpoints.
+        standard:
+          type: string
+          description: |-
+            The proper name of the standard to which this field is harmonized (defined
+            by the documentation for the CCDI metadata fields).
+        url:
+          type: string
+          description: |-
+            A URL to the CCDI documentation where the definition of this harmonized
+            field resides.
+    models.metadata.field.description.Unharmonized:
+      type: object
+      description: An unharmonized metadata field description.
+      required:
+      - harmonized
+      - path
+      properties:
+        harmonized:
+          type: boolean
+          description: |-
+            Whether or not this field is harmonized across the ecosystem.
+
+            This will always be set to `false`.
+          default: false
+        name:
+          type: string
+          description: |-
+            A display name for this metadata field as _suggested_ by the server (this
+            is not considered authoritative and can be ignored by the client if it so
+            chooses). This is mainly to avoid naming collisions of common fields across
+            servers.
+          nullable: true
+        description:
+          type: string
+          description: A plain-text description of what the field represents.
+          nullable: true
+        path:
+          type: string
+          description: |-
+            A comma (`.`) delimited path to the field's location on the `metadata`
+            objects returned by the various subject endpoints.
+        standard:
+          type: string
+          description: |-
+            If the field is considered harmonized across the federation ecosystem, the
+            name of the standard to which the field is harmonized.
+
+            If the field is _not_ harmonized across the federation ecosystem, then this
+            should be [`None`].
+          nullable: true
+        url:
+          type: string
+          description: A url that describes more about the metadata field, if available.
+          nullable: true
     models.subject.Kind:
       type: string
       description: A kind of [`Subject`](super::Subject).
@@ -435,6 +513,32 @@ components:
           items:
             $ref: '#/components/schemas/models.Subject'
           description: The subjects, if available.
+    responses.by.count.Subjects:
+      allOf:
+      - $ref: '#/components/schemas/models.count.Total'
+      - type: object
+        required:
+        - values
+        properties:
+          values:
+            type: object
+            additionalProperties:
+              type: integer
+              minimum: 0
+      description: |-
+        A response for grouping [`Subject`](models::Subject)s by a metadata field
+        and then summing the counts.
+    responses.metadata.FieldDescriptions:
+      type: object
+      description: A response for describing metadata fields for a subject.
+      required:
+      - fields
+      properties:
+        fields:
+          type: array
+          items:
+            $ref: '#/components/schemas/models.metadata.field.Description'
+          description: Field descriptions.
 tags:
 - name: Info
   description: Information about the API implementation itself.