feat: add _meta to more objects

Author: felixweinberger

src/mcp/types.py

@@ -69,8 +69,7 @@ class Meta(BaseModel):
 
     meta: Meta | None = Field(alias="_meta", default=None)
     """
-    This parameter name is reserved by MCP to allow clients and servers to attach
-    additional metadata to their notifications.
+    Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
     """
 
 
@@ -109,8 +108,7 @@ class Result(BaseModel):
 
     meta: dict[str, Any] | None = Field(alias="_meta", default=None)
     """
-    This result property is reserved by the protocol to allow clients and servers to
-    attach additional metadata to their responses.
+    Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
     """
 
 
@@ -395,6 +393,10 @@ class Resource(BaseModel):
     """
     annotations: Annotations | None = None
     model_config = ConfigDict(extra="allow")
+    meta: dict[str, Any] | None = Field(alias="_meta", default=None)
+    """
+    Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
+    """
 
 
 class ResourceTemplate(BaseModel):
@@ -416,6 +418,10 @@ class ResourceTemplate(BaseModel):
     """
     annotations: Annotations | None = None
     model_config = ConfigDict(extra="allow")
+    meta: dict[str, Any] | None = Field(alias="_meta", default=None)
+    """
+    Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
+    """
 
 
 class ListResourcesResult(PaginatedResult):
@@ -622,6 +628,10 @@ class TextContent(BaseModel):
     """The text content of the message."""
     annotations: Annotations | None = None
     model_config = ConfigDict(extra="allow")
+    meta: dict[str, Any] | None = Field(alias="_meta", default=None)
+    """
+    Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
+    """
 
 
 class ImageContent(BaseModel):
@@ -637,6 +647,10 @@ class ImageContent(BaseModel):
     """
     annotations: Annotations | None = None
     model_config = ConfigDict(extra="allow")
+    meta: dict[str, Any] | None = Field(alias="_meta", default=None)
+    """
+    Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
+    """
 
 
 class AudioContent(BaseModel):
@@ -652,6 +666,10 @@ class AudioContent(BaseModel):
     """
     annotations: Annotations | None = None
     model_config = ConfigDict(extra="allow")
+    meta: dict[str, Any] | None = Field(alias="_meta", default=None)
+    """
+    Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
+    """
 
 
 class SamplingMessage(BaseModel):
@@ -773,6 +791,10 @@ class Tool(BaseModel):
     annotations: ToolAnnotations | None = None
     """Optional additional tool information."""
     model_config = ConfigDict(extra="allow")
+    meta: dict[str, Any] | None = Field(alias="_meta", default=None)
+    """
+    Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
+    """
 
 
 class ListToolsResult(PaginatedResult):
@@ -1065,6 +1087,10 @@ class Root(BaseModel):
     referencing the root in other parts of the application.
     """
     model_config = ConfigDict(extra="allow")
+    meta: dict[str, Any] | None = Field(alias="_meta", default=None)
+    """
+    Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
+    """
 
 
 class ListRootsResult(Result):