diff --git a/internal/multiagent/eino_adk_run_loop.go b/internal/multiagent/eino_adk_run_loop.go
index b91d3b8f..4f34c904 100644
--- a/internal/multiagent/eino_adk_run_loop.go
+++ b/internal/multiagent/eino_adk_run_loop.go
@@ -184,14 +184,19 @@ func runEinoADKAgentLoop(ctx context.Context, args *einoADKRunLoopArgs, baseMsgs
 	mainAgentToolStep := make(map[string]int)
 	pendingByID := make(map[string]toolCallPendingInfo)
 	pendingQueueByAgent := make(map[string][]string)
+	var pendingMu sync.Mutex
 	markPending := func(tc toolCallPendingInfo) {
 		if tc.ToolCallID == "" {
 			return
 		}
+		pendingMu.Lock()
+		defer pendingMu.Unlock()
 		pendingByID[tc.ToolCallID] = tc
 		pendingQueueByAgent[tc.EinoAgent] = append(pendingQueueByAgent[tc.EinoAgent], tc.ToolCallID)
 	}
 	popNextPendingForAgent := func(agentName string) (toolCallPendingInfo, bool) {
+		pendingMu.Lock()
+		defer pendingMu.Unlock()
 		q := pendingQueueByAgent[agentName]
 		for len(q) > 0 {
 			id := q[0]
@@ -208,19 +213,42 @@ func runEinoADKAgentLoop(ctx context.Context, args *einoADKRunLoopArgs, baseMsgs
 		if toolCallID == "" {
 			return
 		}
+		pendingMu.Lock()
+		defer pendingMu.Unlock()
 		delete(pendingByID, toolCallID)
 	}
+	popAnyPending := func() (toolCallPendingInfo, bool) {
+		pendingMu.Lock()
+		defer pendingMu.Unlock()
+		for id, tc := range pendingByID {
+			delete(pendingByID, id)
+			return tc, true
+		}
+		return toolCallPendingInfo{}, false
+	}
+	pendingCount := func() int {
+		pendingMu.Lock()
+		defer pendingMu.Unlock()
+		return len(pendingByID)
+	}
 	flushAllPendingAsFailed := func(err error) {
+		pendingMu.Lock()
+		pendingSnapshot := make([]toolCallPendingInfo, 0, len(pendingByID))
+		for _, tc := range pendingByID {
+			pendingSnapshot = append(pendingSnapshot, tc)
+		}
+		pendingByID = make(map[string]toolCallPendingInfo)
+		pendingQueueByAgent = make(map[string][]string)
+		pendingMu.Unlock()
+
 		if progress == nil {
-			pendingByID = make(map[string]toolCallPendingInfo)
-			pendingQueueByAgent = make(map[string][]string)
 			return
 		}
 		msg := ""
 		if err != nil {
 			msg = err.Error()
 		}
-		for _, tc := range pendingByID {
+		for _, tc := range pendingSnapshot {
 			toolName := tc.ToolName
 			if strings.TrimSpace(toolName) == "" {
 				toolName = "unknown"
@@ -238,8 +266,6 @@ func runEinoADKAgentLoop(ctx context.Context, args *einoADKRunLoopArgs, baseMsgs
 				"source":         "eino",
 			})
 		}
-		pendingByID = make(map[string]toolCallPendingInfo)
-		pendingQueueByAgent = make(map[string][]string)
 	}
 
 	// 最近一次成功的 Eino filesystem execute 的标准输出（trim）：用于抑制模型紧接着复述同一字符串时的重复「助手输出」时间线。
@@ -519,8 +545,7 @@ func runEinoADKAgentLoop(ctx context.Context, args *einoADKRunLoopArgs, baseMsgs
 				}
 				return takePartial(ctxErr)
 			}
-			if len(pendingByID) > 0 {
-				orphanCount := len(pendingByID)
+			if orphanCount := pendingCount(); orphanCount > 0 {
 				flushAllPendingAsFailed(errors.New("pending tool call missing result before run completion"))
 				if progress != nil {
 					progress("eino_pending_orphaned", "pending tool calls were force-closed at run end", map[string]interface{}{
@@ -957,12 +982,8 @@ func runEinoADKAgentLoop(ctx context.Context, args *einoADKRunLoopArgs, baseMsgs
 					toolCallID = inferred.ToolCallID
 				} else if inferred, ok := popNextPendingForAgent(""); ok {
 					toolCallID = inferred.ToolCallID
-				} else {
-					for id := range pendingByID {
-						toolCallID = id
-						delete(pendingByID, id)
-						break
-					}
+				} else if inferred, ok := popAnyPending(); ok {
+					toolCallID = inferred.ToolCallID
 				}
 			}
 			if toolCallID != "" {