Specify that task methods themselves should not have related-task metadata

Author: LucaButBoring

docs/specification/draft/basic/utilities/tasks.mdx

@@ -127,12 +127,7 @@ To retrieve the state of a task, requestors send a `tasks/get` request:
   "id": 3,
   "method": "tasks/get",
   "params": {
-    "taskId": "786512e2-9e0d-44bd-8f29-789f320fe840",
-    "_meta": {
-      "modelcontextprotocol.io/related-task": {
-        "taskId": "786512e2-9e0d-44bd-8f29-789f320fe840"
-      }
-    }
+    "taskId": "786512e2-9e0d-44bd-8f29-789f320fe840"
   }
 }
 ```
@@ -169,12 +164,7 @@ To retrieve the result of a completed task, requestors send a `tasks/result` req
   "id": 4,
   "method": "tasks/result",
   "params": {
-    "taskId": "786512e2-9e0d-44bd-8f29-789f320fe840",
-    "_meta": {
-      "modelcontextprotocol.io/related-task": {
-        "taskId": "786512e2-9e0d-44bd-8f29-789f320fe840"
-      }
-    }
+    "taskId": "786512e2-9e0d-44bd-8f29-789f320fe840"
   }
 }
 ```
@@ -282,12 +272,7 @@ To explicitly delete a task and its associated results, requestors send a `tasks
   "id": 6,
   "method": "tasks/delete",
   "params": {
-    "taskId": "786512e2-9e0d-44bd-8f29-789f320fe840",
-    "_meta": {
-      "modelcontextprotocol.io/related-task": {
-        "taskId": "786512e2-9e0d-44bd-8f29-789f320fe840"
-      }
-    }
+    "taskId": "786512e2-9e0d-44bd-8f29-789f320fe840"
   }
 }
 ```
@@ -384,6 +369,7 @@ stateDiagram-v2
 
 1. All requests, notifications, and responses related to a task **MUST** include the `modelcontextprotocol.io/related-task` key in their `_meta`, with the value set to an object with a `taskId` matching the associated task ID.
 1. For example, an elicitation that a task-augmented tool call depends on **MUST** share the same related task ID with that tool call's task.
+1. For the `tasks/get`, `tasks/list`, `tasks/result`, and `tasks/delete` operations, the `taskId` parameter in the request **MUST** be used as the source of truth for identifying the target task. Requestors **SHOULD NOT** include `modelcontextprotocol.io/related-task` metadata in these requests, and receivers **MUST** ignore such metadata if present in favor of the RPC method parameter.
 
 ### Task Cancellation