feat(tasks): Add --include-history flag to tasks list command (#20)

* feat(tasks): Add --include-history flag to tasks list command

- Add --include-history flag to conditionally show conversation history
- By default, tasks list now excludes history for cleaner output  
- Users can still get full details with tasks get <task-id>
- Update README.md with documentation for the new flag

Fixes #19

Co-authored-by: Eden Reich <[email protected]>

* chore: Remove redundant inline comments

---------

Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>
Co-authored-by: Eden Reich <[email protected]>

Author: edenreich

README.md

@@ -169,6 +169,7 @@ output: yaml  # or json
 - `--context-id`: Filter by context ID
 - `--limit`: Maximum number of tasks to return (default: 50)
 - `--offset`: Number of tasks to skip (default: 0)
+- `--include-history`: Include conversation history in the output (default: false)
 
 #### Task Get Options
 
@@ -238,6 +239,18 @@ $ a2a tasks list --state working --limit 5
    Role: user
 ```
 
+#### Include conversation history in task list
+
+By default, `tasks list` excludes conversation history to keep output manageable. Use `--include-history` to show complete task data:
+
+```bash
+# Without history (default - cleaner output)
+$ a2a tasks list --limit 1
+
+# With history (complete task data including conversation)
+$ a2a tasks list --limit 1 --include-history
+```
+
 #### View detailed task information
 
 ```bash

cli/cli.go

@@ -113,6 +113,7 @@ func init() {
 	listTasksCmd.Flags().String("context-id", "", "Filter by context ID")
 	listTasksCmd.Flags().Int("limit", 50, "Maximum number of tasks to return")
 	listTasksCmd.Flags().Int("offset", 0, "Number of tasks to skip")
+	listTasksCmd.Flags().Bool("include-history", false, "Include conversation history in the output")
 	getTaskCmd.Flags().Int("history-length", 0, "Number of history messages to include")
 	submitTaskCmd.Flags().String("context-id", "", "Context ID for the task (optional, will generate new context if not provided)")
 	submitTaskCmd.Flags().String("task-id", "", "Task ID to resume (optional)")
@@ -350,6 +351,7 @@ var listTasksCmd = &cobra.Command{
 		contextID, _ := cmd.Flags().GetString("context-id")
 		limit, _ := cmd.Flags().GetInt("limit")
 		offset, _ := cmd.Flags().GetInt("offset")
+		includeHistory, _ := cmd.Flags().GetBool("include-history")
 
 		params := adk.TaskListParams{
 			Limit:  limit,
@@ -382,10 +384,27 @@ var listTasksCmd = &cobra.Command{
 			return fmt.Errorf("failed to unmarshal task list: %w", err)
 		}
 
+		tasks := taskList.Tasks
+		if !includeHistory {
+			var filteredTasks []adk.Task
+			for _, task := range tasks {
+				filteredTask := adk.Task{
+					ID:        task.ID,
+					Kind:      task.Kind,
+					ContextID: task.ContextID,
+					Status:    task.Status,
+					Artifacts: task.Artifacts,
+					Metadata:  task.Metadata,
+				}
+				filteredTasks = append(filteredTasks, filteredTask)
+			}
+			tasks = filteredTasks
+		}
+
 		output := map[string]any{
-			"tasks":   taskList.Tasks,
+			"tasks":   tasks,
 			"total":   taskList.Total,
-			"showing": len(taskList.Tasks),
+			"showing": len(tasks),
 		}
 
 		return printFormatted(output)