add subagents control tool and session kind visibility

pkg/tools/subagents_tool.go

@@ -0,0 +1,76 @@
+package tools
+
+import (
+	"context"
+	"fmt"
+	"strings"
+)
+
+type SubagentsTool struct {
+	manager *SubagentManager
+}
+
+func NewSubagentsTool(m *SubagentManager) *SubagentsTool {
+	return &SubagentsTool{manager: m}
+}
+
+func (t *SubagentsTool) Name() string { return "subagents" }
+
+func (t *SubagentsTool) Description() string {
+	return "Manage subagent runs in current process: list, info, kill"
+}
+
+func (t *SubagentsTool) Parameters() map[string]interface{} {
+	return map[string]interface{}{
+		"type": "object",
+		"properties": map[string]interface{}{
+			"action": map[string]interface{}{"type": "string", "description": "list|info|kill"},
+			"id":     map[string]interface{}{"type": "string", "description": "subagent id for info/kill"},
+		},
+		"required": []string{"action"},
+	}
+}
+
+func (t *SubagentsTool) Execute(ctx context.Context, args map[string]interface{}) (string, error) {
+	_ = ctx
+	if t.manager == nil {
+		return "subagent manager not available", nil
+	}
+	action, _ := args["action"].(string)
+	action = strings.ToLower(strings.TrimSpace(action))
+	id, _ := args["id"].(string)
+	id = strings.TrimSpace(id)
+
+	switch action {
+	case "list":
+		tasks := t.manager.ListTasks()
+		if len(tasks) == 0 {
+			return "No subagents.", nil
+		}
+		var sb strings.Builder
+		sb.WriteString("Subagents:\n")
+		for _, task := range tasks {
+			sb.WriteString(fmt.Sprintf("- %s [%s] label=%s\n", task.ID, task.Status, task.Label))
+		}
+		return strings.TrimSpace(sb.String()), nil
+	case "info":
+		if id == "" {
+			return "id is required for info", nil
+		}
+		task, ok := t.manager.GetTask(id)
+		if !ok {
+			return "subagent not found", nil
+		}
+		return fmt.Sprintf("ID: %s\nStatus: %s\nLabel: %s\nTask: %s\nResult:\n%s", task.ID, task.Status, task.Label, task.Task, task.Result), nil
+	case "kill":
+		if id == "" {
+			return "id is required for kill", nil
+		}
+		if !t.manager.KillTask(id) {
+			return "subagent not found", nil
+		}
+		return "subagent kill requested", nil
+	default:
+		return "unsupported action", nil
+	}
+}