From 24d06c5220e82f1f1b79fff2ef161415506c75d5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=85=AC=E6=98=8E?=
 <83812544+Ed1s0nZ@users.noreply.github.com>
Date: Wed, 19 Aug 2026 00:25:08 +0800
Subject: [PATCH] Fix missing results for parallel Eino tool calls.

Merge streaming tool outputs by CallID with ConcatMessages, pair same-name historical results, and FIFO-match duplicate IDs so concurrent nmap 1/2 and 2/2 stay distinct.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 internal/database/conversation.go             | 144 +++++++++++-------
 .../database/process_details_summary_test.go  |  67 +++++++-
 internal/multiagent/eino_adk_run_loop.go      |  39 +++--
 .../eino_adk_run_loop_stream_test.go          |  23 +++
 .../multiagent/eino_agentic_event_adapter.go  |   5 +
 .../eino_run_progress_tracker_test.go         |  33 ++++
 .../multiagent/eino_tool_result_concat.go     |  91 +++++++++++
 .../eino_tool_result_concat_test.go           |  41 +++++
 .../eino_tool_result_event_handler.go         |  53 ++++---
 .../eino_tool_result_event_handler_test.go    |  48 ++++++
 internal/multiagent/runner.go                 |  27 ++++
 web/static/js/monitor.js                      |  33 +++-
 .../js/tool-result-args-backfill.test.cjs     |   7 +
 13 files changed, 522 insertions(+), 89 deletions(-)
 create mode 100644 internal/multiagent/eino_tool_result_concat.go
 create mode 100644 internal/multiagent/eino_tool_result_concat_test.go

diff --git a/internal/database/conversation.go b/internal/database/conversation.go
index 7ecac55e..52cbbd2a 100644
--- a/internal/database/conversation.go
+++ b/internal/database/conversation.go
@@ -1548,12 +1548,12 @@ LIMIT 1`, messageID).Scan(&terminalEvent, &terminalCreatedAt)
 	seenExecIDs := make(map[string]bool)
 	// A provider may reuse a fallback toolCallId across streaming rounds. Keep a
 	// FIFO per ID instead of a single index so every persisted call gets at most
-	// one result. Results without a stable ID are kept separate instead of being
-	// guessed by order; showing no link is safer than linking to the wrong tool.
+	// one result. ID-less results still attach to an unmatched call with the same
+	// tool name (parallel nmap 1/2, 2/2 often lose one ID); different tools stay
+	// unlinked so a leftover preview cannot steal another call's slot.
 	toolIndexesByCallID := make(map[string][]int)
 	lastMatchedToolIndexByCallID := make(map[string]int)
 	matchedToolIndexes := make([]bool, 0)
-	nextUnmatchedToolIdx := 0
 	for execRows.Next() {
 		var detailID string
 		var eventType string
@@ -1569,24 +1569,10 @@ LIMIT 1`, messageID).Scan(&terminalEvent, &terminalCreatedAt)
 		if err := json.Unmarshal([]byte(dataJSON), &payload); err != nil {
 			continue
 		}
-		toolName, _ := payload["toolName"].(string)
-		toolName = strings.TrimSpace(toolName)
-		toolCallID, _ := payload["toolCallId"].(string)
-		toolCallID = strings.TrimSpace(toolCallID)
-		execID, _ := payload["executionId"].(string)
-		execID = strings.TrimSpace(execID)
-		status := ""
-		if eventType == "tool_result" {
-			if success, ok := payload["success"].(bool); ok {
-				if success {
-					status = "completed"
-				} else {
-					status = "failed"
-				}
-			} else if isErr, ok := payload["isError"].(bool); ok && isErr {
-				status = "failed"
-			}
-		}
+		toolName := processDetailString(payload, "toolName")
+		toolCallID := processDetailString(payload, "toolCallId")
+		execID := processDetailString(payload, "executionId")
+		status := toolResultStatusFromPayload(payload, eventType)
 		if eventType == "tool_call" {
 			summary.ToolExecutions = append(summary.ToolExecutions, ProcessDetailsToolExecution{
 				ProcessDetailID: strings.TrimSpace(detailID),
@@ -1603,36 +1589,14 @@ LIMIT 1`, messageID).Scan(&terminalEvent, &terminalCreatedAt)
 			}
 		}
 		if eventType == "tool_result" {
-			idx := -1
-			if toolCallID != "" {
-				queue := toolIndexesByCallID[toolCallID]
-				for len(queue) > 0 {
-					candidate := queue[0]
-					queue = queue[1:]
-					if candidate >= 0 && candidate < len(matchedToolIndexes) && !matchedToolIndexes[candidate] {
-						idx = candidate
-						break
-					}
-				}
-				toolIndexesByCallID[toolCallID] = queue
-				if idx < 0 {
-					// Multiple persisted result events for one call (for example an
-					// agent-facing reduced result replacing an earlier preview) update
-					// that call instead of consuming an unrelated FIFO entry.
-					if previous, ok := lastMatchedToolIndexByCallID[toolCallID]; ok {
-						idx = previous
-					}
-				}
-			}
-			if idx < 0 && toolCallID != "" {
-				for nextUnmatchedToolIdx < len(matchedToolIndexes) && matchedToolIndexes[nextUnmatchedToolIdx] {
-					nextUnmatchedToolIdx++
-				}
-				if nextUnmatchedToolIdx < len(matchedToolIndexes) {
-					idx = nextUnmatchedToolIdx
-					nextUnmatchedToolIdx++
-				}
-			}
+			idx := matchToolExecutionIndex(
+				summary.ToolExecutions,
+				matchedToolIndexes,
+				toolCallID,
+				toolName,
+				toolIndexesByCallID,
+				lastMatchedToolIndexByCallID,
+			)
 			if idx >= 0 && idx < len(summary.ToolExecutions) {
 				matchedToolIndexes[idx] = true
 				if toolCallID != "" {
@@ -1648,6 +1612,8 @@ LIMIT 1`, messageID).Scan(&terminalEvent, &terminalCreatedAt)
 				summary.ToolExecutions[idx].ExecutionID = execID
 				if status != "" {
 					summary.ToolExecutions[idx].Status = status
+				} else {
+					summary.ToolExecutions[idx].Status = "completed"
 				}
 			} else {
 				summary.ToolExecutions = append(summary.ToolExecutions, ProcessDetailsToolExecution{
@@ -1704,6 +1670,82 @@ LIMIT 1`, messageID).Scan(&terminalEvent, &terminalCreatedAt)
 	return summary, nil
 }
 
+func processDetailString(payload map[string]interface{}, key string) string {
+	if payload == nil {
+		return ""
+	}
+	v, ok := payload[key]
+	if !ok || v == nil {
+		return ""
+	}
+	s := strings.TrimSpace(fmt.Sprint(v))
+	if s == "" || s == "<nil>" {
+		return ""
+	}
+	return s
+}
+
+func toolResultStatusFromPayload(payload map[string]interface{}, eventType string) string {
+	if eventType != "tool_result" {
+		return ""
+	}
+	if status := processDetailString(payload, "status"); strings.EqualFold(status, "background_running") {
+		return "background_running"
+	}
+	if success, ok := payload["success"].(bool); ok {
+		if success {
+			return "completed"
+		}
+		return "failed"
+	}
+	if isErr, ok := payload["isError"].(bool); ok && isErr {
+		return "failed"
+	}
+	return "completed"
+}
+
+func matchToolExecutionIndex(
+	executions []ProcessDetailsToolExecution,
+	matched []bool,
+	toolCallID, toolName string,
+	toolIndexesByCallID map[string][]int,
+	lastMatchedToolIndexByCallID map[string]int,
+) int {
+	if toolCallID != "" {
+		queue := toolIndexesByCallID[toolCallID]
+		for len(queue) > 0 {
+			candidate := queue[0]
+			queue = queue[1:]
+			if candidate >= 0 && candidate < len(matched) && !matched[candidate] {
+				toolIndexesByCallID[toolCallID] = queue
+				return candidate
+			}
+		}
+		toolIndexesByCallID[toolCallID] = queue
+		if previous, ok := lastMatchedToolIndexByCallID[toolCallID]; ok {
+			return previous
+		}
+	}
+	if toolName != "" {
+		for i := range matched {
+			if matched[i] {
+				continue
+			}
+			if strings.EqualFold(strings.TrimSpace(executions[i].ToolName), toolName) {
+				return i
+			}
+		}
+	}
+	if toolCallID != "" {
+		for i := range matched {
+			if !matched[i] {
+				return i
+			}
+		}
+	}
+	return -1
+}
+
 // GetProcessDetailsPage 分页获取消息的过程详情（按时间升序）。
 func (db *DB) GetProcessDetailsPage(messageID string, limit, offset int) ([]ProcessDetail, int, error) {
 	var total int
diff --git a/internal/database/process_details_summary_test.go b/internal/database/process_details_summary_test.go
index 200f6b7d..141ea44d 100644
--- a/internal/database/process_details_summary_test.go
+++ b/internal/database/process_details_summary_test.go
@@ -8,7 +8,7 @@ import (
 	"go.uber.org/zap"
 )
 
-func TestProcessDetailsSummaryDoesNotGuessIDLessResultsByOrder(t *testing.T) {
+func TestProcessDetailsSummaryDoesNotGuessIDLessResultsOntoDifferentTool(t *testing.T) {
 	db, conversationID, messageID := setupProcessDetailsSummaryTest(t)
 	for _, id := range []string{"call-1", "call-2", "call-3", "call-4"} {
 		if err := db.AddProcessDetail(messageID, conversationID, "tool_call", "call", map[string]interface{}{
@@ -20,8 +20,8 @@ func TestProcessDetailsSummaryDoesNotGuessIDLessResultsByOrder(t *testing.T) {
 	results := []map[string]interface{}{
 		{"toolName": "http-framework-test", "toolCallId": "call-1", "success": true},
 		{"toolName": "http-framework-test", "toolCallId": "call-2", "success": true},
-		{"toolName": "http-framework-test", "success": true},
-		{"toolName": "http-framework-test", "success": true},
+		{"toolName": "other-tool", "success": true},
+		{"toolName": "other-tool", "success": true},
 	}
 	var resultIDs []string
 	for _, result := range results {
@@ -53,12 +53,71 @@ func TestProcessDetailsSummaryDoesNotGuessIDLessResultsByOrder(t *testing.T) {
 		}
 	}
 	for i, execution := range summary.ToolExecutions[4:] {
-		if execution.Status != "completed" || execution.ToolCallID != "" {
+		if execution.Status != "completed" || execution.ToolCallID != "" || execution.ToolName != "other-tool" {
 			t.Fatalf("idless result %d = %#v, want separate completed result without toolCallId", i, execution)
 		}
 	}
 }
 
+func TestProcessDetailsSummaryPairsIDLessResultsWithSameToolName(t *testing.T) {
+	db, conversationID, messageID := setupProcessDetailsSummaryTest(t)
+	for i, id := range []string{"call-1", "call-2"} {
+		if err := db.AddProcessDetail(messageID, conversationID, "tool_call", "call", map[string]interface{}{
+			"toolName": "nmap", "toolCallId": id, "index": i + 1, "total": 2,
+		}); err != nil {
+			t.Fatalf("AddProcessDetail(tool_call): %v", err)
+		}
+	}
+	var resultIDs []string
+	for i := 0; i < 2; i++ {
+		resultID, err := db.AddProcessDetailWithID(messageID, conversationID, "tool_result", "result", map[string]interface{}{
+			"toolName": "nmap", "success": true,
+		})
+		if err != nil {
+			t.Fatalf("AddProcessDetail(tool_result): %v", err)
+		}
+		resultIDs = append(resultIDs, resultID)
+	}
+
+	summary, err := db.GetProcessDetailsSummary(messageID)
+	if err != nil {
+		t.Fatalf("GetProcessDetailsSummary: %v", err)
+	}
+	if len(summary.ToolExecutions) != 2 {
+		t.Fatalf("tool executions = %d, want 2", len(summary.ToolExecutions))
+	}
+	for i, execution := range summary.ToolExecutions {
+		if execution.Status != "completed" {
+			t.Fatalf("execution %d status = %q, want completed", i, execution.Status)
+		}
+		if execution.ResultDetailID != resultIDs[i] {
+			t.Fatalf("execution %d result detail id = %q, want %q", i, execution.ResultDetailID, resultIDs[i])
+		}
+	}
+}
+
+func TestProcessDetailsSummaryPairedResultWithoutSuccessIsCompleted(t *testing.T) {
+	db, conversationID, messageID := setupProcessDetailsSummaryTest(t)
+	if err := db.AddProcessDetail(messageID, conversationID, "tool_call", "call", map[string]interface{}{
+		"toolName": "nmap", "toolCallId": "call-1",
+	}); err != nil {
+		t.Fatalf("AddProcessDetail(tool_call): %v", err)
+	}
+	if err := db.AddProcessDetail(messageID, conversationID, "tool_result", "result", map[string]interface{}{
+		"toolName": "nmap", "toolCallId": "call-1", "resultPreview": "open 22",
+	}); err != nil {
+		t.Fatalf("AddProcessDetail(tool_result): %v", err)
+	}
+
+	summary, err := db.GetProcessDetailsSummary(messageID)
+	if err != nil {
+		t.Fatalf("GetProcessDetailsSummary: %v", err)
+	}
+	if len(summary.ToolExecutions) != 1 || summary.ToolExecutions[0].Status != "completed" {
+		t.Fatalf("tool executions = %#v, want completed", summary.ToolExecutions)
+	}
+}
+
 func TestProcessDetailsSummaryPairsRepeatedToolCallIDsFIFO(t *testing.T) {
 	db, conversationID, messageID := setupProcessDetailsSummaryTest(t)
 	for i := 0; i < 2; i++ {
diff --git a/internal/multiagent/eino_adk_run_loop.go b/internal/multiagent/eino_adk_run_loop.go
index 2b31eebc..3f06ec78 100644
--- a/internal/multiagent/eino_adk_run_loop.go
+++ b/internal/multiagent/eino_adk_run_loop.go
@@ -443,22 +443,41 @@ func nextAgentEventWithContext(ctx context.Context, iter *adk.AsyncIterator[*adk
 
 // recvSchemaMessageStream 消费 ADK Tool 流式结果；ctx 取消时立即返回，避免 amass 等无输出时永久阻塞。
 func recvSchemaMessageStream(ctx context.Context, stream *schema.StreamReader[*schema.Message]) (content, toolCallID, toolName string, recvErr error) {
-	if stream == nil {
-		return "", "", "", nil
+	msgs, recvErr := recvSchemaToolResultMessages(ctx, stream)
+	if len(msgs) == 0 {
+		return "", "", "", recvErr
 	}
-	var buf strings.Builder
-	recvErr = recvEinoSchemaMessageStreamWithContext(ctx, stream, 8, func(chunk *schema.Message) {
-		if chunk.Content != "" {
-			buf.WriteString(chunk.Content)
+	parts := make([]string, 0, len(msgs))
+	for _, msg := range msgs {
+		if msg == nil {
+			continue
 		}
-		if tid := strings.TrimSpace(chunk.ToolCallID); tid != "" {
-			toolCallID = tid
+		parts = append(parts, msg.Content)
+		if id := strings.TrimSpace(msg.ToolCallID); id != "" {
+			toolCallID = id
 		}
-		if name := strings.TrimSpace(chunk.ToolName); name != "" {
+		if name := strings.TrimSpace(msg.ToolName); name != "" {
 			toolName = name
 		}
+	}
+	return strings.Join(parts, ""), toolCallID, toolName, recvErr
+}
+
+// recvSchemaToolResultMessages 先收齐 Tool 流，再用 Eino ConcatMessages 合并。
+// EventSender 一 call 一条流时走 ConcatMessages；并行结果被摊平进同一条流时按 CallID 分列再合并。
+func recvSchemaToolResultMessages(ctx context.Context, stream *schema.StreamReader[*schema.Message]) (msgs []*schema.Message, recvErr error) {
+	if stream == nil {
+		return nil, nil
+	}
+	var chunks []*schema.Message
+	recvErr = recvEinoSchemaMessageStreamWithContext(ctx, stream, 8, func(chunk *schema.Message) {
+		chunks = append(chunks, chunk)
 	})
-	return buf.String(), toolCallID, toolName, recvErr
+	msgs, concatErr := concatToolResultChunks(chunks)
+	if concatErr != nil && recvErr == nil {
+		return nil, concatErr
+	}
+	return msgs, recvErr
 }
 
 func buildEinoCheckpointID(orchMode string) string {
diff --git a/internal/multiagent/eino_adk_run_loop_stream_test.go b/internal/multiagent/eino_adk_run_loop_stream_test.go
index 2ca8381a..cb312a8c 100644
--- a/internal/multiagent/eino_adk_run_loop_stream_test.go
+++ b/internal/multiagent/eino_adk_run_loop_stream_test.go
@@ -30,6 +30,29 @@ func TestRecvSchemaMessageStream_EOF(t *testing.T) {
 	}
 }
 
+func TestRecvSchemaToolResultMessages_SplitsParallelIDs(t *testing.T) {
+	sr, sw := schema.Pipe[*schema.Message](8)
+	_ = sw.Send(schema.ToolMessage("one-", "tc-1", schema.WithToolName("nmap")), nil)
+	_ = sw.Send(schema.ToolMessage("two-", "tc-2", schema.WithToolName("nmap")), nil)
+	_ = sw.Send(schema.ToolMessage("a", "tc-1", schema.WithToolName("nmap")), nil)
+	_ = sw.Send(schema.ToolMessage("b", "tc-2", schema.WithToolName("nmap")), nil)
+	sw.Close()
+
+	msgs, err := recvSchemaToolResultMessages(context.Background(), sr)
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	if len(msgs) != 2 {
+		t.Fatalf("msgs = %#v, want 2", msgs)
+	}
+	if msgs[0].ToolCallID != "tc-1" || msgs[0].Content != "one-a" {
+		t.Fatalf("msg 0 = %#v", msgs[0])
+	}
+	if msgs[1].ToolCallID != "tc-2" || msgs[1].Content != "two-b" {
+		t.Fatalf("msg 1 = %#v", msgs[1])
+	}
+}
+
 func TestRecvSchemaMessageStream_CapturesToolName(t *testing.T) {
 	sr, sw := schema.Pipe[*schema.Message](4)
 	_ = sw.Send(schema.ToolMessage("hello", "tc-1", schema.WithToolName("execute")), nil)
diff --git a/internal/multiagent/eino_agentic_event_adapter.go b/internal/multiagent/eino_agentic_event_adapter.go
index 0b91c49d..1e6b809a 100644
--- a/internal/multiagent/eino_agentic_event_adapter.go
+++ b/internal/multiagent/eino_agentic_event_adapter.go
@@ -31,6 +31,11 @@ func adaptAgenticEventToEinoEvents(ev *adk.TypedAgentEvent[*schema.AgenticMessag
 		return []*adk.AgentEvent{base(&adk.AgentOutput{CustomizedOutput: customized})}
 	}
 	if mv.IsStreaming {
+		// Tool 流保持 1 event ↔ 1 MessageStream，对齐 ADK EventSenderToolWrapper：
+		// 每个 CallID 在工具包装层就已经是独立事件。这里不能再按 CallID 现场拆成
+		// 多条 live pipe——drain 会阻塞读完当前流，交错的并行 chunk 会把另一列写满后死锁。
+		// 若上游仍把 ToolsNode 的 MergeStreamReaders 摊成一条流，由
+		// concatToolResultChunks 按列 ConcatMessages 恢复。
 		return []*adk.AgentEvent{base(&adk.AgentOutput{
 			MessageOutput: &adk.MessageVariant{
 				IsStreaming:   true,
diff --git a/internal/multiagent/eino_run_progress_tracker_test.go b/internal/multiagent/eino_run_progress_tracker_test.go
index a3e9c635..c754e804 100644
--- a/internal/multiagent/eino_run_progress_tracker_test.go
+++ b/internal/multiagent/eino_run_progress_tracker_test.go
@@ -98,6 +98,39 @@ func TestEinoRunProgressTrackerDedupesToolCalls(t *testing.T) {
 	}
 }
 
+func TestEinoRunProgressTrackerDedupesSameToolCallIDsWithDifferentArgs(t *testing.T) {
+	var toolCalls int
+	progress := func(eventType, _ string, _ interface{}) {
+		if eventType == "tool_call" {
+			toolCalls++
+		}
+	}
+	tracker := newEinoRunProgressTracker("deep", "lead", "conv-1", progress, nil, nil)
+	first := &schema.Message{ToolCalls: []schema.ToolCall{{
+		ID:   "call-1",
+		Type: "function",
+		Function: schema.FunctionCall{
+			Name:      "nmap",
+			Arguments: `{"host":"10.0.0.1"}`,
+		},
+	}}}
+	second := &schema.Message{ToolCalls: []schema.ToolCall{{
+		ID:   "call-1",
+		Type: "function",
+		Function: schema.FunctionCall{
+			Name:      "nmap",
+			Arguments: `{"host":"10.0.0.1","ports":"1-1024"}`,
+		},
+	}}}
+
+	tracker.EmitToolCalls(first, "lead", nil)
+	tracker.EmitToolCalls(second, "lead", nil)
+
+	if toolCalls != 1 {
+		t.Fatalf("tool call events = %d, want 1", toolCalls)
+	}
+}
+
 func TestEinoRunProgressTrackerHidesModelOutputRecoveryToolCalls(t *testing.T) {
 	var eventTypes []string
 	var marked []toolCallPendingInfo
diff --git a/internal/multiagent/eino_tool_result_concat.go b/internal/multiagent/eino_tool_result_concat.go
new file mode 100644
index 00000000..b8d10545
--- /dev/null
+++ b/internal/multiagent/eino_tool_result_concat.go
@@ -0,0 +1,91 @@
+package multiagent
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/cloudwego/eino/schema"
+)
+
+// concatToolResultChunks 按 Eino 原生语义合并工具结果流：
+//   - 同一 CallID（EventSender 一 call 一 event）：schema.ConcatMessages
+//   - 并行工具被摊进同一条流（ToolsNode MergeStreamReaders 扁平化后）：
+//     按 CallID 分列后再 ConcatMessages，等价于 schema.ConcatMessageArray
+func concatToolResultChunks(chunks []*schema.Message) ([]*schema.Message, error) {
+	if len(chunks) == 0 {
+		return nil, nil
+	}
+	if toolResultChunksShareCallID(chunks) {
+		merged, err := schema.ConcatMessages(chunks)
+		if err != nil {
+			return nil, err
+		}
+		return []*schema.Message{merged}, nil
+	}
+	return concatToolResultChunksByCallID(chunks)
+}
+
+func toolResultChunksShareCallID(chunks []*schema.Message) bool {
+	id := ""
+	for _, chunk := range chunks {
+		if chunk == nil {
+			continue
+		}
+		got := strings.TrimSpace(chunk.ToolCallID)
+		if got == "" {
+			continue
+		}
+		if id == "" {
+			id = got
+			continue
+		}
+		if got != id {
+			return false
+		}
+	}
+	return true
+}
+
+func concatToolResultChunksByCallID(chunks []*schema.Message) ([]*schema.Message, error) {
+	type column struct {
+		key    string
+		chunks []*schema.Message
+	}
+	var ordered []column
+	index := make(map[string]int)
+	lastKey := ""
+	anon := 0
+	for _, chunk := range chunks {
+		if chunk == nil {
+			continue
+		}
+		key := strings.TrimSpace(chunk.ToolCallID)
+		if key == "" {
+			if lastKey != "" {
+				key = lastKey
+			} else {
+				key = fmt.Sprintf("\x00anon-%d", anon)
+				anon++
+			}
+		}
+		if idx, ok := index[key]; ok {
+			ordered[idx].chunks = append(ordered[idx].chunks, chunk)
+		} else {
+			index[key] = len(ordered)
+			ordered = append(ordered, column{key: key, chunks: []*schema.Message{chunk}})
+		}
+		lastKey = key
+	}
+	out := make([]*schema.Message, 0, len(ordered))
+	for _, col := range ordered {
+		merged, err := schema.ConcatMessages(col.chunks)
+		if err != nil {
+			return nil, err
+		}
+		if strings.HasPrefix(col.key, "\x00anon-") {
+			merged.ToolCallID = ""
+		}
+		out = append(out, merged)
+	}
+	return out, nil
+}
diff --git a/internal/multiagent/eino_tool_result_concat_test.go b/internal/multiagent/eino_tool_result_concat_test.go
new file mode 100644
index 00000000..cb65313b
--- /dev/null
+++ b/internal/multiagent/eino_tool_result_concat_test.go
@@ -0,0 +1,41 @@
+package multiagent
+
+import (
+	"testing"
+
+	"github.com/cloudwego/eino/schema"
+)
+
+func TestConcatToolResultChunksUsesEinoConcatForSingleCall(t *testing.T) {
+	got, err := concatToolResultChunks([]*schema.Message{
+		schema.ToolMessage("hel", "call-1", schema.WithToolName("execute")),
+		schema.ToolMessage("lo", "call-1", schema.WithToolName("execute")),
+	})
+	if err != nil {
+		t.Fatalf("concat: %v", err)
+	}
+	if len(got) != 1 || got[0].ToolCallID != "call-1" || got[0].Content != "hello" || got[0].ToolName != "execute" {
+		t.Fatalf("got = %#v, want one ConcatMessages result", got)
+	}
+}
+
+func TestConcatToolResultChunksSplitsParallelCalls(t *testing.T) {
+	got, err := concatToolResultChunks([]*schema.Message{
+		schema.ToolMessage("nmap 1/2 ", "call-1", schema.WithToolName("nmap")),
+		schema.ToolMessage("nmap 2/2 ", "call-2", schema.WithToolName("nmap")),
+		schema.ToolMessage("22/tcp", "call-1", schema.WithToolName("nmap")),
+		schema.ToolMessage("80/tcp", "call-2", schema.WithToolName("nmap")),
+	})
+	if err != nil {
+		t.Fatalf("concat: %v", err)
+	}
+	if len(got) != 2 {
+		t.Fatalf("got = %#v, want two calls", got)
+	}
+	if got[0].ToolCallID != "call-1" || got[0].Content != "nmap 1/2 22/tcp" {
+		t.Fatalf("call-1 = %#v", got[0])
+	}
+	if got[1].ToolCallID != "call-2" || got[1].Content != "nmap 2/2 80/tcp" {
+		t.Fatalf("call-2 = %#v", got[1])
+	}
+}
diff --git a/internal/multiagent/eino_tool_result_event_handler.go b/internal/multiagent/eino_tool_result_event_handler.go
index 2d5a9588..2542e2e1 100644
--- a/internal/multiagent/eino_tool_result_event_handler.go
+++ b/internal/multiagent/eino_tool_result_event_handler.go
@@ -42,27 +42,42 @@ func (h *einoToolResultEventHandler) HandleStreaming(mv *adk.MessageVariant, age
 	if h == nil || mv == nil || !mv.IsStreaming || mv.MessageStream == nil || mv.Role != schema.Tool {
 		return false
 	}
-	toolName := strings.TrimSpace(mv.ToolName)
-	content, streamToolCallID, streamToolName, recvErr := recvSchemaMessageStream(h.ctx, mv.MessageStream)
-	if toolName == "" {
-		toolName = streamToolName
+	defaultName := strings.TrimSpace(mv.ToolName)
+	msgs, recvErr := recvSchemaToolResultMessages(h.ctx, mv.MessageStream)
+	if isEinoVoluntaryCancelErr(recvErr) && len(msgs) == 0 {
+		msgs = []*schema.Message{schema.ToolMessage("已中断并继续，当前工具调用已停止。", "", schema.WithToolName(defaultName))}
 	}
-	if isEinoVoluntaryCancelErr(recvErr) && strings.TrimSpace(content) == "" {
-		content = "已中断并继续，当前工具调用已停止。"
+	if len(msgs) == 0 {
+		msgs = []*schema.Message{schema.ToolMessage("", "", schema.WithToolName(defaultName))}
 	}
-	isErr := einoToolResultIsError(toolName, content) || isEinoVoluntaryCancelErr(recvErr)
-	content = einoToolResultBody(content)
-	if streamToolCallID != "" && h.runMessages != nil {
-		h.runMessages.AppendToolMessage(content, streamToolCallID, schema.WithToolName(toolName))
-	}
-	if h.emitter != nil {
-		h.emitter.Emit(h.ctx, toolName, content, streamToolCallID, isErr, agentName)
-	}
-	if recvErr != nil && !isEinoVoluntaryCancelErr(recvErr) && h.logger != nil {
-		h.logger.Warn("eino tool result stream recv error",
-			zap.Error(recvErr),
-			zap.String("agent", agentName),
-			zap.String("tool", toolName))
+	for _, msg := range msgs {
+		if msg == nil {
+			continue
+		}
+		toolName := strings.TrimSpace(msg.ToolName)
+		if toolName == "" {
+			toolName = defaultName
+		}
+		content := msg.Content
+		if isEinoVoluntaryCancelErr(recvErr) && strings.TrimSpace(content) == "" {
+			content = "已中断并继续，当前工具调用已停止。"
+		}
+		isErr := einoToolResultIsError(toolName, content) || isEinoVoluntaryCancelErr(recvErr)
+		content = einoToolResultBody(content)
+		toolCallID := strings.TrimSpace(msg.ToolCallID)
+		if toolCallID != "" && h.runMessages != nil {
+			h.runMessages.AppendToolMessage(content, toolCallID, schema.WithToolName(toolName))
+		}
+		if h.emitter != nil {
+			h.emitter.Emit(h.ctx, toolName, content, toolCallID, isErr, agentName)
+		}
+		if recvErr != nil && !isEinoVoluntaryCancelErr(recvErr) && h.logger != nil {
+			h.logger.Warn("eino tool result stream recv error",
+				zap.Error(recvErr),
+				zap.String("agent", agentName),
+				zap.String("tool", toolName),
+				zap.String("toolCallId", toolCallID))
+		}
 	}
 	if recvErr == nil && h.confirmRecovery != nil {
 		h.confirmRecovery()
diff --git a/internal/multiagent/eino_tool_result_event_handler_test.go b/internal/multiagent/eino_tool_result_event_handler_test.go
index 32e6aedf..e297f971 100644
--- a/internal/multiagent/eino_tool_result_event_handler_test.go
+++ b/internal/multiagent/eino_tool_result_event_handler_test.go
@@ -59,6 +59,54 @@ func TestEinoToolResultEventHandlerHandlesStreamingToolResult(t *testing.T) {
 	}
 }
 
+func TestEinoToolResultEventHandlerSplitsParallelStreamingResults(t *testing.T) {
+	var events []map[string]interface{}
+	runMessages := newEinoRunMessageAccumulator(nil)
+	emitter := newEinoToolResultProgressEmitter(einoToolResultProgressEmitterConfig{
+		ConversationID: "conv-1",
+		Progress: func(eventType, _ string, data interface{}) {
+			if eventType != "tool_result" {
+				return
+			}
+			m, _ := data.(map[string]interface{})
+			events = append(events, m)
+		},
+	})
+	handler := newEinoToolResultEventHandler(einoToolResultEventHandlerConfig{
+		RunMessages: runMessages,
+		Emitter:     emitter,
+	})
+	stream := schema.StreamReaderFromArray([]*schema.Message{
+		{Role: schema.Tool, Content: "nmap 1/2 start ", ToolCallID: "call-1", ToolName: "nmap"},
+		{Role: schema.Tool, Content: "nmap 2/2 start ", ToolCallID: "call-2", ToolName: "nmap"},
+		{Role: schema.Tool, Content: "22/tcp open", ToolCallID: "call-1", ToolName: "nmap"},
+		{Role: schema.Tool, Content: "80/tcp open", ToolCallID: "call-2", ToolName: "nmap"},
+	})
+	mv := &adk.MessageVariant{
+		IsStreaming:   true,
+		Role:          schema.Tool,
+		ToolName:      "nmap",
+		MessageStream: stream,
+	}
+
+	if !handler.HandleStreaming(mv, "worker") {
+		t.Fatal("streaming tool result was not handled")
+	}
+	if len(events) != 2 {
+		t.Fatalf("events = %#v, want two tool_result", events)
+	}
+	if events[0]["toolCallId"] != "call-1" || events[0]["result"] != "nmap 1/2 start 22/tcp open" {
+		t.Fatalf("first event = %#v", events[0])
+	}
+	if events[1]["toolCallId"] != "call-2" || events[1]["result"] != "nmap 2/2 start 80/tcp open" {
+		t.Fatalf("second event = %#v", events[1])
+	}
+	msgs := runMessages.Messages()
+	if len(msgs) != 2 || msgs[0].ToolCallID != "call-1" || msgs[1].ToolCallID != "call-2" {
+		t.Fatalf("run messages = %#v", msgs)
+	}
+}
+
 func TestEinoToolResultEventHandlerHandlesMaterializedToolResult(t *testing.T) {
 	var event map[string]interface{}
 	emitter := newEinoToolResultProgressEmitter(einoToolResultProgressEmitterConfig{
diff --git a/internal/multiagent/runner.go b/internal/multiagent/runner.go
index d62bf3ca..4e30d1c1 100644
--- a/internal/multiagent/runner.go
+++ b/internal/multiagent/runner.go
@@ -908,10 +908,37 @@ func tryEmitToolCallsOnce(
 	if _, ok := seen[sig]; ok {
 		return
 	}
+	if idSig := toolCallsStableIDSignature(msg); idSig != "" {
+		idKey := agentName + "\x1eids\x1e" + idSig
+		if _, ok := seen[idKey]; ok {
+			return
+		}
+		seen[idKey] = struct{}{}
+	}
 	seen[sig] = struct{}{}
 	emitToolCallsFromMessage(msg, agentName, orchestratorName, conversationID, orchMode, progress, subAgentToolStep, mainAgentToolStep, markPending)
 }
 
+func toolCallsStableIDSignature(msg *schema.Message) string {
+	if msg == nil || len(msg.ToolCalls) == 0 {
+		return ""
+	}
+	visible := filterVisibleToolCallsForProgress(msg.ToolCalls)
+	ids := make([]string, 0, len(visible))
+	for _, tc := range visible {
+		id := strings.TrimSpace(tc.ID)
+		if id == "" {
+			continue
+		}
+		ids = append(ids, id)
+	}
+	if len(ids) == 0 {
+		return ""
+	}
+	sort.Strings(ids)
+	return strings.Join(ids, ";")
+}
+
 func emitToolCallsFromMessage(
 	msg *schema.Message,
 	agentName, orchestratorName, conversationID, orchMode string,
diff --git a/web/static/js/monitor.js b/web/static/js/monitor.js
index 77926f74..0c26a66c 100644
--- a/web/static/js/monitor.js
+++ b/web/static/js/monitor.js
@@ -6255,21 +6255,44 @@ function coalesceProcessDetailsToolPairs(details) {
                 createdAt: detail.createdAt,
                 data: Object.assign({}, data)
             };
-            if (id) callsById.set(id, copy);
+            if (id) {
+                let list = callsById.get(id);
+                if (!list) {
+                    list = [];
+                    callsById.set(id, list);
+                }
+                list.push(copy);
+            }
             fifoCalls.push(copy);
             out.push(copy);
-        } else         if (et === 'tool_result') {
+        } else if (et === 'tool_result') {
             let target = null;
             if (id && callsById.has(id)) {
-                target = callsById.get(id);
-            } else {
+                const list = callsById.get(id);
+                while (list.length) {
+                    const candidate = list.shift();
+                    if (candidate && candidate.data && !candidate.data._mergedResult) {
+                        target = candidate;
+                        break;
+                    }
+                }
+            }
+            if (!target) {
+                const resultName = String(data.toolName || '').trim().toLowerCase();
+                let anyUnmatched = null;
                 for (let j = 0; j < fifoCalls.length; j++) {
                     const c = fifoCalls[j];
-                    if (c && c.data && !c.data._mergedResult) {
+                    if (!c || !c.data || c.data._mergedResult) continue;
+                    if (!anyUnmatched) anyUnmatched = c;
+                    const callName = String(c.data.toolName || '').trim().toLowerCase();
+                    if (!resultName || !callName || callName === resultName) {
                         target = c;
                         break;
                     }
                 }
+                if (!target && id) {
+                    target = anyUnmatched;
+                }
             }
             if (target) {
                 // agentFacing 或较新的 tool_result 覆盖旧合并（历史数据可能含 reduction 前全量正文）
diff --git a/web/static/js/tool-result-args-backfill.test.cjs b/web/static/js/tool-result-args-backfill.test.cjs
index ba2e6439..c2a8f739 100644
--- a/web/static/js/tool-result-args-backfill.test.cjs
+++ b/web/static/js/tool-result-args-backfill.test.cjs
@@ -16,3 +16,10 @@ test('历史 process_details 合并时也会从 tool_result 补齐 tool_call 参
     assert.match(source, /targetDetail\.data\.argumentsObj = resultArgs;/);
     assert.match(source, /targetDetail\.data\.arguments = JSON\.stringify\(resultArgs\);/);
 });
+
+test('同一 toolCallId 的多次调用按 FIFO 合并结果，避免后一次覆盖导致结果记录缺失', () => {
+    const source = fs.readFileSync('web/static/js/monitor.js', 'utf8');
+    assert.match(source, /list\.push\(copy\)/);
+    assert.match(source, /const candidate = list\.shift\(\)/);
+    assert.match(source, /callName === resultName/);
+});