diff --git a/docs/openapi/genarrative-external-v1.openapi.json b/docs/openapi/genarrative-external-v1.openapi.json
index df02f1edd..92732c25a 100644
--- a/docs/openapi/genarrative-external-v1.openapi.json
+++ b/docs/openapi/genarrative-external-v1.openapi.json
@@ -2064,11 +2064,31 @@
               ]
             },
             "then": {
+              "required": [
+                "imageSequenceFrames",
+                "imageSequenceDurationMs"
+              ],
               "properties": {
                 "generationInputs": {
                   "$ref": "#/components/schemas/ExternalCharacterAnimationGenerationInputs"
                 }
               }
+            },
+            "else": {
+              "not": {
+                "anyOf": [
+                  {
+                    "required": [
+                      "imageSequenceFrames"
+                    ]
+                  },
+                  {
+                    "required": [
+                      "imageSequenceDurationMs"
+                    ]
+                  }
+                ]
+              }
             }
           }
         ],
@@ -2158,6 +2178,7 @@
           },
           "imageSequenceFrames": {
             "type": "array",
+            "minItems": 2,
             "items": {
               "$ref": "#/components/schemas/EditorImageSequenceFrame"
             }
@@ -2189,11 +2210,31 @@
               ]
             },
             "then": {
+              "required": [
+                "imageSequenceFrames",
+                "imageSequenceDurationMs"
+              ],
               "properties": {
                 "generationInputs": {
                   "$ref": "#/components/schemas/ExternalCharacterAnimationGenerationInputs"
                 }
               }
+            },
+            "else": {
+              "not": {
+                "anyOf": [
+                  {
+                    "required": [
+                      "imageSequenceFrames"
+                    ]
+                  },
+                  {
+                    "required": [
+                      "imageSequenceDurationMs"
+                    ]
+                  }
+                ]
+              }
             }
           }
         ],
@@ -2275,6 +2316,7 @@
           },
           "imageSequenceFrames": {
             "type": "array",
+            "minItems": 2,
             "items": {
               "$ref": "#/components/schemas/EditorImageSequenceFrame"
             }
diff --git a/server-rs/crates/api-server/src/external_editor_api.rs b/server-rs/crates/api-server/src/external_editor_api.rs
index c0076d7d4..10baecb1f 100644
--- a/server-rs/crates/api-server/src/external_editor_api.rs
+++ b/server-rs/crates/api-server/src/external_editor_api.rs
@@ -1021,6 +1021,11 @@ fn serialize_external_editor_generation_inputs(
 mod tests {
     use super::*;
 
+    const EXTERNAL_MEDIA_CREATE_REQUEST_SCHEMAS: [&str; 2] = [
+        "ExternalEditorAssetCreateRequest",
+        "ExternalEditorProjectResourceCreateRequest",
+    ];
+
     fn external_generation_job_fixture(status: &str) -> ExternalGenerationJobRecord {
         ExternalGenerationJobRecord {
             job_id: "task-external-test".to_string(),
@@ -1246,6 +1251,62 @@ mod tests {
         assert!(!unavailable.body_text().contains("ConnectDropped"));
     }
 
+    #[test]
+    fn external_openapi_character_animation_create_requires_complete_sequence_metadata() {
+        let parsed: Value = serde_json::from_str(OPENAPI_JSON).expect("openapi json should parse");
+
+        for request_schema_name in EXTERNAL_MEDIA_CREATE_REQUEST_SCHEMAS {
+            let request_schema = &parsed["components"]["schemas"][request_schema_name];
+            let conditional = &request_schema["allOf"][0];
+            assert_eq!(
+                conditional["then"]["required"],
+                json!(["imageSequenceFrames", "imageSequenceDurationMs"]),
+                "{request_schema_name}"
+            );
+            assert_eq!(
+                request_schema["properties"]["imageSequenceFrames"]["minItems"],
+                json!(2),
+                "{request_schema_name}"
+            );
+            assert_eq!(
+                request_schema["properties"]["imageSequenceDurationMs"]["minimum"],
+                json!(1),
+                "{request_schema_name}"
+            );
+            assert_eq!(
+                conditional["then"]["properties"]["generationInputs"]["$ref"],
+                "#/components/schemas/ExternalCharacterAnimationGenerationInputs",
+                "{request_schema_name}"
+            );
+        }
+    }
+
+    #[test]
+    fn external_openapi_non_animation_create_forbids_sequence_metadata() {
+        let parsed: Value = serde_json::from_str(OPENAPI_JSON).expect("openapi json should parse");
+
+        for request_schema_name in EXTERNAL_MEDIA_CREATE_REQUEST_SCHEMAS {
+            let request_schema = &parsed["components"]["schemas"][request_schema_name];
+            let conditional = &request_schema["allOf"][0];
+            assert_eq!(
+                conditional["if"]["required"],
+                json!(["assetKind"]),
+                "{request_schema_name}"
+            );
+            let forbidden_fields = conditional["else"]["not"]["anyOf"]
+                .as_array()
+                .expect("非角色动作分支必须逐项禁止序列字段")
+                .iter()
+                .filter_map(|schema| schema["required"][0].as_str())
+                .collect::<Vec<_>>();
+            assert_eq!(
+                forbidden_fields,
+                ["imageSequenceFrames", "imageSequenceDurationMs"],
+                "{request_schema_name}"
+            );
+        }
+    }
+
     #[test]
     fn exported_openapi_json_contains_external_editor_routes_and_security() {
         let parsed: Value = serde_json::from_str(OPENAPI_JSON).expect("openapi json should parse");
@@ -1270,19 +1331,12 @@ mod tests {
                 .collect::<Vec<_>>(),
             legacy_runtime_fields
         );
-        for request_schema in [
-            "ExternalEditorAssetCreateRequest",
-            "ExternalEditorProjectResourceCreateRequest",
-        ] {
-            let conditional = &parsed["components"]["schemas"][request_schema]["allOf"][0];
+        for request_schema in EXTERNAL_MEDIA_CREATE_REQUEST_SCHEMAS {
             assert_eq!(
-                conditional["if"]["properties"]["assetKind"]["const"],
+                parsed["components"]["schemas"][request_schema]["allOf"][0]["if"]["properties"]["assetKind"]
+                    ["const"],
                 "character-animation"
             );
-            assert_eq!(
-                conditional["then"]["properties"]["generationInputs"]["$ref"],
-                "#/components/schemas/ExternalCharacterAnimationGenerationInputs"
-            );
         }
         assert!(
             parsed["paths"]