fix: fix mcp output_schema is optional (#39453)

Co-authored-by: yunlu.wen <yunlu.wen@dify.ai>

api/core/tools/mcp_tool/tool.py

@@ -107,6 +107,8 @@ class MCPTool(Tool):
         if self.entity.output_schema and result.structuredContent:
             for k, v in result.structuredContent.items():
                 yield self.create_variable_message(k, v)
+        elif result.structuredContent:
+            yield self.create_json_message(result.structuredContent)
 
     def _process_text_content(self, content: TextContent) -> Generator[ToolInvokeMessage, None, None]:
         """Process text content and yield appropriate messages."""

api/pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "dify-api"
-version = "1.16.0"
+version = "1.16.1"
 requires-python = "~=3.12.0"
 
 dependencies = [

api/tests/unit_tests/tools/test_mcp_tool.py

@@ -135,6 +135,19 @@ class TestMCPToolInvoke:
         values = {m.message.variable_name: m.message.variable_value for m in var_msgs}
         assert values == {"a": 1, "b": "x"}
 
+    def test_invoke_yields_json_when_structured_content_has_no_output_schema(self, orm_session: Session) -> None:
+        tool = _make_mcp_tool()
+        result = CallToolResult(content=[], structuredContent={"a": 1, "b": "x"})
+
+        with patch.object(tool, "invoke_remote_mcp_tool", return_value=result):
+            messages = list(tool._invoke(session=orm_session, user_id="test_user", tool_parameters={}))
+
+        assert len(messages) == 1
+        msg = messages[0]
+        assert msg.type == ToolInvokeMessage.MessageType.JSON
+        assert isinstance(msg.message, ToolInvokeMessage.JsonMessage)
+        assert msg.message.json_object == {"a": 1, "b": "x"}
+
 
 class TestMCPToolUsageExtraction:
     """Test usage metadata extraction from MCP tool results."""

api/uv.lock

@@ -1281,7 +1281,7 @@ wheels = [
 
 [[package]]
 name = "dify-agent"
-version = "1.16.0"
+version = "1.16.1"
 source = { editable = "../dify-agent" }
 dependencies = [
     { name = "httpx" },
@@ -1331,7 +1331,7 @@ docs = [
 
 [[package]]
 name = "dify-api"
-version = "1.16.0"
+version = "1.16.1"
 source = { virtual = "." }
 dependencies = [
     { name = "aliyun-log-python-sdk" },

cli/package.json

@@ -71,7 +71,7 @@
     "channel": "alpha",
     "compat": {
       "minDify": "1.16.0",
-      "maxDify": "1.16.0"
+      "maxDify": "1.16.1"
     },
     "release": {
       "tagPrefix": "difyctl-v",

dify-agent/pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "dify-agent"
-version = "1.16.0"
+version = "1.16.1"
 description = "Add your description here"
 readme = "README.md"
 requires-python = ">=3.12,<4.0"

dify-agent/uv.lock

@@ -581,7 +581,7 @@ wheels = [
 
 [[package]]
 name = "dify-agent"
-version = "1.16.0"
+version = "1.16.1"
 source = { editable = "." }
 dependencies = [
     { name = "httpx" },

docker/docker-compose-template.yaml

@@ -220,7 +220,7 @@ services:
   # API service
   api:
     <<: *shared-api-worker-config
-    image: langgenius/dify-api:1.16.0
+    image: langgenius/dify-api:1.16.1
     environment:
       MODE: api
       SENTRY_DSN: ${API_SENTRY_DSN:-}
@@ -271,7 +271,7 @@ services:
   # WebSocket service for workflow collaboration.
   api_websocket:
     <<: *shared-api-worker-config
-    image: langgenius/dify-api:1.16.0
+    image: langgenius/dify-api:1.16.1
     profiles:
       - collaboration
     environment:
@@ -297,7 +297,7 @@ services:
   # The Celery worker for processing all queues (dataset, workflow, mail, etc.)
   worker:
     <<: *shared-worker-config
-    image: langgenius/dify-api:1.16.0
+    image: langgenius/dify-api:1.16.1
     environment:
       MODE: worker
       SENTRY_DSN: ${API_SENTRY_DSN:-}
@@ -347,7 +347,7 @@ services:
   # Celery beat for scheduling periodic tasks.
   worker_beat:
     <<: *shared-worker-beat-config
-    image: langgenius/dify-api:1.16.0
+    image: langgenius/dify-api:1.16.1
     environment:
       MODE: beat
     depends_on:
@@ -380,7 +380,7 @@ services:
 
   # Frontend web application.
   web:
-    image: langgenius/dify-web:1.16.0
+    image: langgenius/dify-web:1.16.1
     restart: always
     env_file:
       - path: ./envs/core-services/web.env
@@ -542,7 +542,7 @@ services:
   # on port 3128, which only allows agent_backend /agent-stub/ and the Dify API
   # /files/* endpoints (see ssrf_proxy/squid-agent.conf.template).
   local_sandbox:
-    image: langgenius/dify-agent-local-sandbox:1.16.0
+    image: langgenius/dify-agent-local-sandbox:1.16.1
     restart: always
     env_file:
       - path: ./envs/core-services/local-sandbox.env
@@ -651,7 +651,7 @@ services:
 
   # Dify Agent backend service.
   agent_backend:
-    image: langgenius/dify-agent-backend:1.16.0
+    image: langgenius/dify-agent-backend:1.16.1
     restart: always
     env_file:
       - path: ./envs/core-services/dify-agent.env

docker/docker-compose.yaml

@@ -226,7 +226,7 @@ services:
   # API service
   api:
     <<: *shared-api-worker-config
-    image: langgenius/dify-api:1.16.0
+    image: langgenius/dify-api:1.16.1
     environment:
       MODE: api
       SENTRY_DSN: ${API_SENTRY_DSN:-}
@@ -277,7 +277,7 @@ services:
   # WebSocket service for workflow collaboration.
   api_websocket:
     <<: *shared-api-worker-config
-    image: langgenius/dify-api:1.16.0
+    image: langgenius/dify-api:1.16.1
     profiles:
       - collaboration
     environment:
@@ -303,7 +303,7 @@ services:
   # The Celery worker for processing all queues (dataset, workflow, mail, etc.)
   worker:
     <<: *shared-worker-config
-    image: langgenius/dify-api:1.16.0
+    image: langgenius/dify-api:1.16.1
     environment:
       MODE: worker
       SENTRY_DSN: ${API_SENTRY_DSN:-}
@@ -353,7 +353,7 @@ services:
   # Celery beat for scheduling periodic tasks.
   worker_beat:
     <<: *shared-worker-beat-config
-    image: langgenius/dify-api:1.16.0
+    image: langgenius/dify-api:1.16.1
     environment:
       MODE: beat
     depends_on:
@@ -386,7 +386,7 @@ services:
 
   # Frontend web application.
   web:
-    image: langgenius/dify-web:1.16.0
+    image: langgenius/dify-web:1.16.1
     restart: always
     env_file:
       - path: ./envs/core-services/web.env
@@ -548,7 +548,7 @@ services:
   # on port 3128, which only allows agent_backend /agent-stub/ and the Dify API
   # /files/* endpoints (see ssrf_proxy/squid-agent.conf.template).
   local_sandbox:
-    image: langgenius/dify-agent-local-sandbox:1.16.0
+    image: langgenius/dify-agent-local-sandbox:1.16.1
     restart: always
     env_file:
       - path: ./envs/core-services/local-sandbox.env
@@ -657,7 +657,7 @@ services:
 
   # Dify Agent backend service.
   agent_backend:
-    image: langgenius/dify-agent-backend:1.16.0
+    image: langgenius/dify-agent-backend:1.16.1
     restart: always
     env_file:
       - path: ./envs/core-services/dify-agent.env

web/package.json

@@ -1,6 +1,6 @@
 {
   "name": "dify-web",
-  "version": "1.16.0",
+  "version": "1.16.1",
   "private": true,
   "type": "module",
   "imports": {