feat: add MCP support (#20716)

Co-authored-by: QuantumGhost <obelisk.reg+git@gmail.com>

api/core/plugin/entities/parameters.py

@@ -43,6 +43,19 @@ class PluginParameterType(enum.StrEnum):
     # deprecated, should not use.
     SYSTEM_FILES = CommonParameterType.SYSTEM_FILES.value
 
+    # MCP object and array type parameters
+    ARRAY = CommonParameterType.ARRAY.value
+    OBJECT = CommonParameterType.OBJECT.value
+
+
+class MCPServerParameterType(enum.StrEnum):
+    """
+    MCP server got complex parameter types
+    """
+
+    ARRAY = "array"
+    OBJECT = "object"
+
 
 class PluginParameterAutoGenerate(BaseModel):
     class Type(enum.StrEnum):
@@ -138,6 +151,34 @@ def cast_parameter_value(typ: enum.StrEnum, value: Any, /):
                 if value and not isinstance(value, list):
                     raise ValueError("The tools selector must be a list.")
                 return value
+            case PluginParameterType.ARRAY:
+                if not isinstance(value, list):
+                    # Try to parse JSON string for arrays
+                    if isinstance(value, str):
+                        try:
+                            import json
+
+                            parsed_value = json.loads(value)
+                            if isinstance(parsed_value, list):
+                                return parsed_value
+                        except (json.JSONDecodeError, ValueError):
+                            pass
+                    return [value]
+                return value
+            case PluginParameterType.OBJECT:
+                if not isinstance(value, dict):
+                    # Try to parse JSON string for objects
+                    if isinstance(value, str):
+                        try:
+                            import json
+
+                            parsed_value = json.loads(value)
+                            if isinstance(parsed_value, dict):
+                                return parsed_value
+                        except (json.JSONDecodeError, ValueError):
+                            pass
+                    return {}
+                return value
             case _:
                 return str(value)
     except ValueError:

api/core/plugin/entities/plugin.py

@@ -72,6 +72,7 @@ class PluginDeclaration(BaseModel):
 
     class Meta(BaseModel):
         minimum_dify_version: Optional[str] = Field(default=None, pattern=r"^\d{1,4}(\.\d{1,4}){1,3}(-\w{1,16})?$")
+        version: Optional[str] = Field(default=None)
 
     version: str = Field(..., pattern=r"^\d{1,4}(\.\d{1,4}){1,3}(-\w{1,16})?$")
     author: Optional[str] = Field(..., pattern=r"^[a-zA-Z0-9_-]{1,64}$")

api/core/plugin/entities/plugin_daemon.py

@@ -53,6 +53,7 @@ class PluginAgentProviderEntity(BaseModel):
     plugin_unique_identifier: str
     plugin_id: str
     declaration: AgentProviderEntityWithPlugin
+    meta: PluginDeclaration.Meta
 
 
 class PluginBasicBooleanResponse(BaseModel):

api/core/plugin/entities/request.py

@@ -32,7 +32,7 @@ class RequestInvokeTool(BaseModel):
     Request to invoke a tool
     """
 
-    tool_type: Literal["builtin", "workflow", "api"]
+    tool_type: Literal["builtin", "workflow", "api", "mcp"]
     provider: str
     tool: str
     tool_parameters: dict