Fix minor issues

- Consolidated TaskInfo and Task types for tasks/list
- Fixed a type

Author: LucaButBoring

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

@@ -13,7 +13,7 @@ The design of tasks may evolve in future protocol versions.
 
 </Note>
 
-The Model Context Protcol (MCP) allows requestors (which can be either clients or servers, depending on the direction of communication) to augment their requests with **tasks**. Tasks are durable state machines that carry information about the underlying execution state of the request they wrap, and are intended for requestor polling and deferred result retrieval. Each task is uniquely identifiable by a receiver-generated **task ID**.
+The Model Context Protocol (MCP) allows requestors (which can be either clients or servers, depending on the direction of communication) to augment their requests with **tasks**. Tasks are durable state machines that carry information about the underlying execution state of the request they wrap, and are intended for requestor polling and deferred result retrieval. Each task is uniquely identifiable by a receiver-generated **task ID**.
 
 ## User Interaction Model
 

docs/specification/draft/schema.mdx

@@ -1329,50 +1329,13 @@ export interface ListTasksRequest extends PaginatedRequest {
   method: "tasks/list";
 }
 
-/**
- * A summary of a task's state, as returned by tasks/list.
- *
- * @category tasks/list
- */
-export interface TaskInfo {
-  /**
-   * The task identifier.
-   */
-  taskId: string;
-
-  /**
-   * Current task state.
-   */
-  status: TaskStatus;
-
-  /**
-   * ISO 8601 timestamp when the task was created.
-   */
-  createdAt: string;
-
-  /**
-   * Retention duration from creation in milliseconds, null for unlimited.
-   */
-  ttl: number | null;
-
-  /**
-   * Suggested polling interval in milliseconds.
-   */
-  pollInterval?: number;
-
-  /**
-   * Error message if status is "failed".
-   */
-  error?: string;
-}
-
 /**
  * The response to a tasks/list request.
  *
  * @category tasks/list
  */
 export interface ListTasksResult extends PaginatedResult {
-  tasks: TaskInfo[];
+  tasks: Task[];
 }
 
 /**