diff --git a/dist/schema.json b/dist/schema.json
index 6ea7f8a..9726923 100644
--- a/dist/schema.json
+++ b/dist/schema.json
@@ -35204,6 +35204,28 @@
                   "x",
                   "y"
                 ]
+              },
+              "small": {
+                "description": "Details about the small preview version of the attachment.",
+                "oneOf": [
+                  {
+                    "$ref": "#/components/schemas/MetaDetails"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "original": {
+                "description": "Details about the original version of the attachment.",
+                "oneOf": [
+                  {
+                    "$ref": "#/components/schemas/MetaDetails"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
               }
             }
           },
@@ -35241,6 +35263,58 @@
           "description": "Official Mastodon API documentation"
         }
       },
+      "MetaDetails": {
+        "type": "object",
+        "description": "Metadata details about a media attachment.",
+        "properties": {
+          "aspect": {
+            "description": "The media aspect ratio of the video or image attachment.",
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "bitrate": {
+            "description": "The media bitrate of the video or audio attachment.",
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
+          "duration": {
+            "description": "The duration of the video attachment.",
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "frame_rate": {
+            "description": "The frame rate of the video attachment.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "height": {
+            "description": "The height of the attachment in pixels.",
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
+          "width": {
+            "description": "The width of the attachment in pixels.",
+            "type": [
+              "integer",
+              "null"
+            ]
+          }
+        },
+        "externalDocs": {
+          "url": "https://docs.joinmastodon.org/entities/MetaDetails/#attributes",
+          "description": "Official Mastodon API documentation"
+        }
+      },
       "Notification": {
         "type": "object",
         "description": "Represents a notification of an event relevant to the user.",
diff --git a/src/__tests__/parsers/EntityParser.draft.test.ts b/src/__tests__/parsers/EntityParser.draft.test.ts
index e1bd554..e353ed3 100644
--- a/src/__tests__/parsers/EntityParser.draft.test.ts
+++ b/src/__tests__/parsers/EntityParser.draft.test.ts
@@ -40,6 +40,6 @@ describe('EntityParser - Draft File Handling', () => {
     // This test validates that only explicit draft: true is filtered
     // This is implicitly tested by checking that we still get a reasonable number of entities
     const entities = parser.parseAllEntities();
-    expect(entities.length).toBe(91); // Exact count after removing EncryptedMessage and entities from blocked files (increased due to extracted nested entities + Admin::DimensionData + DiscoverOauthServerConfigurationResponse + OEmbedResponse)
+    expect(entities.length).toBe(92); // Exact count after removing EncryptedMessage and entities from blocked files (increased due to extracted nested entities + Admin::DimensionData + DiscoverOauthServerConfigurationResponse + OEmbedResponse + MetaDetails)
   });
 });
diff --git a/src/__tests__/parsers/EntityParser.metadetails.test.ts b/src/__tests__/parsers/EntityParser.metadetails.test.ts
new file mode 100644
index 0000000..3c1d40e
--- /dev/null
+++ b/src/__tests__/parsers/EntityParser.metadetails.test.ts
@@ -0,0 +1,85 @@
+import { EntityParser } from '../../parsers/EntityParser';
+
+describe('EntityParser - MetaDetails Entity', () => {
+  let entities: ReturnType<EntityParser['parseAllEntities']>;
+
+  beforeAll(() => {
+    const parser = new EntityParser();
+    entities = parser.parseAllEntities();
+  });
+
+  test('should parse MetaDetails entity', () => {
+    const metaDetails = entities.find((e) => e.name === 'MetaDetails');
+
+    expect(metaDetails).toBeDefined();
+    expect(metaDetails?.description).toBe(
+      'Metadata details about a media attachment.'
+    );
+  });
+
+  test('MetaDetails should have all required properties', () => {
+    const metaDetails = entities.find((e) => e.name === 'MetaDetails');
+
+    expect(metaDetails).toBeDefined();
+    expect(metaDetails?.attributes).toBeDefined();
+
+    const attributeNames = metaDetails?.attributes.map((attr) => attr.name);
+    expect(attributeNames).toContain('width');
+    expect(attributeNames).toContain('height');
+    expect(attributeNames).toContain('frame_rate');
+    expect(attributeNames).toContain('duration');
+    expect(attributeNames).toContain('bitrate');
+    expect(attributeNames).toContain('aspect');
+  });
+
+  test('MetaDetails properties should be nullable', () => {
+    const metaDetails = entities.find((e) => e.name === 'MetaDetails');
+
+    expect(metaDetails).toBeDefined();
+    expect(metaDetails?.attributes).toBeDefined();
+
+    // All properties should be nullable
+    metaDetails?.attributes.forEach((attr) => {
+      expect(attr.nullable).toBe(true);
+    });
+  });
+
+  test('MediaAttachment should have meta[small] and meta[original] properties', () => {
+    const mediaAttachment = entities.find((e) => e.name === 'MediaAttachment');
+
+    expect(mediaAttachment).toBeDefined();
+    expect(mediaAttachment?.attributes).toBeDefined();
+
+    const attributeNames = mediaAttachment?.attributes.map((attr) => attr.name);
+    expect(attributeNames).toContain('meta[small]');
+    expect(attributeNames).toContain('meta[original]');
+  });
+
+  test('MediaAttachment meta[small] should reference MetaDetails', () => {
+    const mediaAttachment = entities.find((e) => e.name === 'MediaAttachment');
+
+    expect(mediaAttachment).toBeDefined();
+
+    const metaSmall = mediaAttachment?.attributes.find(
+      (attr) => attr.name === 'meta[small]'
+    );
+    expect(metaSmall).toBeDefined();
+    expect(metaSmall?.type).toContain('MetaDetails');
+    expect(metaSmall?.optional).toBe(true);
+    expect(metaSmall?.nullable).toBe(true);
+  });
+
+  test('MediaAttachment meta[original] should reference MetaDetails', () => {
+    const mediaAttachment = entities.find((e) => e.name === 'MediaAttachment');
+
+    expect(mediaAttachment).toBeDefined();
+
+    const metaOriginal = mediaAttachment?.attributes.find(
+      (attr) => attr.name === 'meta[original]'
+    );
+    expect(metaOriginal).toBeDefined();
+    expect(metaOriginal?.type).toContain('MetaDetails');
+    expect(metaOriginal?.optional).toBe(true);
+    expect(metaOriginal?.nullable).toBe(true);
+  });
+});