diff --git a/internal/agent/component/agent.go b/internal/agent/component/agent.go
index e2d18bad42..fd5edaa8c1 100644
--- a/internal/agent/component/agent.go
+++ b/internal/agent/component/agent.go
@@ -93,6 +93,8 @@ type AgentParam struct {
 	BaseURL string
 }
 
+const agentUserPromptSchemaDefault = "This is the order you need to send to the agent."
+
 // AgentMeta declares the OpenAI-style function-call interface for the
 // Agent component. Mirrors ragflow Python's ToolMeta shape.
 type AgentMeta struct {
@@ -394,6 +396,10 @@ func (c *AgentComponent) Name() string { return "Agent" }
 // the output map.
 func (c *AgentComponent) Invoke(ctx context.Context, inputs map[string]any) (map[string]any, error) {
 	p := mergeAgentParam(c.param, inputs)
+	hasRuntimeUserPrompt := false
+	if v, ok := stringFrom(inputs, "user_prompt"); ok {
+		hasRuntimeUserPrompt = !shouldFallbackToSysQuery(v)
+	}
 
 	// v3.6.1: derive the driver and bare model name from the
 	// composite llm_id when the Agent DSL didn't set `driver`. The
@@ -418,6 +424,30 @@ func (c *AgentComponent) Invoke(ctx context.Context, inputs map[string]any) (map
 	}
 	p.APIKey, p.BaseURL = resolveTenantLLMConfig(ctx, p.Driver, p.ModelID, p.APIKey, p.BaseURL, originalModelID)
 
+	var state *runtime.CanvasState
+	if s, _, err := runtime.GetStateFromContext[*runtime.CanvasState](ctx); err == nil && s != nil {
+		state = s
+		if resolved, rerr := runtime.ResolveTemplate(p.SystemPrompt, state); resolved != p.SystemPrompt || rerr == nil {
+			p.SystemPrompt = resolved
+			if rerr != nil {
+				common.Debug("agent: resolve system_prompt", zap.Error(rerr))
+			}
+		}
+		if resolved, rerr := runtime.ResolveTemplate(p.UserPrompt, state); resolved != p.UserPrompt || rerr == nil {
+			p.UserPrompt = resolved
+			if rerr != nil {
+				common.Debug("agent: resolve user_prompt", zap.Error(rerr))
+			}
+		}
+	}
+	if hasRuntimeUserPrompt {
+		p.UserPrompt = formatAgentRuntimePrompt(inputs, p.UserPrompt)
+	} else if shouldFallbackToSysQuery(p.UserPrompt) && state != nil {
+		if query, ok := stringFromState(state, "query"); ok {
+			p.UserPrompt = query
+		}
+	}
+
 	if p.ModelID == "" {
 		return nil, &ParamError{Field: "model_id", Reason: "required"}
 	}
@@ -586,10 +616,7 @@ func buildAgentChatModel(p AgentParam) (*models.EinoChatModel, error) {
 	if driver == "" {
 		driver = "dummy"
 	}
-	var baseURL map[string]string
-	if p.BaseURL != "" {
-		baseURL = map[string]string{"default": p.BaseURL}
-	}
+	baseURL := baseURLMapForDriver(driver, p.BaseURL)
 	// urlSuffix: see chatURLSuffixFor in llm.go for the rationale.
 	// The factory's NewModelDriver stores URLSuffix verbatim; the
 	// driver then appends URLSuffix.Chat to baseURL to build the
@@ -696,6 +723,95 @@ func extractToolCalls(msg *schema.Message) []map[string]any {
 	return calls
 }
 
+// promptMessagesFromParams extracts the Python DSL `prompts` list into
+// the single system/user prompt shape supported by the Go ReAct runner.
+func promptMessagesFromParams(params map[string]any) (systemPrompt, userPrompt string, ok bool) {
+	raw, exists := params["prompts"]
+	if !exists {
+		return "", "", false
+	}
+	switch v := raw.(type) {
+	case string:
+		return "", v, true
+	case []any:
+		var systems, users []string
+		for _, item := range v {
+			m, ok := item.(map[string]any)
+			if !ok {
+				continue
+			}
+			content, ok := stringFrom(m, "content")
+			if !ok {
+				continue
+			}
+			role, _ := stringFrom(m, "role")
+			switch strings.ToLower(strings.TrimSpace(role)) {
+			case "system":
+				systems = append(systems, content)
+			case "user", "":
+				users = append(users, content)
+			}
+		}
+		if len(systems) == 0 && len(users) == 0 {
+			return "", "", false
+		}
+		return strings.Join(systems, "\n"), strings.Join(users, "\n"), true
+	case []map[string]any:
+		items := make([]any, 0, len(v))
+		for _, item := range v {
+			items = append(items, item)
+		}
+		return promptMessagesFromParams(map[string]any{"prompts": items})
+	}
+	return "", "", false
+}
+
+func appendPromptText(base, extra string) string {
+	if strings.TrimSpace(extra) == "" {
+		return base
+	}
+	if strings.TrimSpace(base) == "" {
+		return extra
+	}
+	return base + "\n" + extra
+}
+
+func hasNonEmptyString(inputs map[string]any, name string) bool {
+	v, ok := stringFrom(inputs, name)
+	return ok && strings.TrimSpace(v) != ""
+}
+
+func shouldFallbackToSysQuery(prompt string) bool {
+	p := strings.TrimSpace(prompt)
+	return p == "" || p == agentUserPromptSchemaDefault
+}
+
+func stringFromState(state *runtime.CanvasState, name string) (string, bool) {
+	if state == nil {
+		return "", false
+	}
+	v, ok := state.Sys[name].(string)
+	if !ok || strings.TrimSpace(v) == "" {
+		return "", false
+	}
+	return v, true
+}
+
+func formatAgentRuntimePrompt(inputs map[string]any, userPrompt string) string {
+	var b strings.Builder
+	if reasoning, ok := stringFrom(inputs, "reasoning"); ok && reasoning != "" {
+		fmt.Fprintf(&b, "\nREASONING:\n%s\n", reasoning)
+	}
+	if contextText, ok := stringFrom(inputs, "context"); ok && contextText != "" {
+		fmt.Fprintf(&b, "\nCONTEXT:\n%s\n", contextText)
+	}
+	if b.Len() == 0 {
+		return userPrompt
+	}
+	fmt.Fprintf(&b, "\nQUERY:\n%s\n", userPrompt)
+	return b.String()
+}
+
 // mergeAgentParam layers raw inputs over the receiver's default param set.
 //
 // v1 aliases accepted alongside the v2 names: "llm_id" → "model_id",
@@ -714,7 +830,13 @@ func mergeAgentParam(base AgentParam, inputs map[string]any) AgentParam {
 	} else if v, ok := stringFrom(inputs, "sys_prompt"); ok {
 		p.SystemPrompt = v
 	}
-	if v, ok := stringFrom(inputs, "user_prompt"); ok {
+	if promptSystem, promptUser, ok := promptMessagesFromParams(inputs); ok {
+		p.SystemPrompt = appendPromptText(p.SystemPrompt, promptSystem)
+		if strings.TrimSpace(promptUser) != "" {
+			p.UserPrompt = promptUser
+		}
+	}
+	if v, ok := stringFrom(inputs, "user_prompt"); ok && !shouldFallbackToSysQuery(v) {
 		p.UserPrompt = v
 	}
 	if v, ok := floatFrom(inputs, "top_p"); ok {
@@ -807,7 +929,11 @@ func init() {
 		} else if v, ok := stringFrom(params, "sys_prompt"); ok {
 			p.SystemPrompt = v
 		}
-		if v, ok := stringFrom(params, "user_prompt"); ok {
+		if promptSystem, promptUser, ok := promptMessagesFromParams(params); ok {
+			p.SystemPrompt = appendPromptText(p.SystemPrompt, promptSystem)
+			p.UserPrompt = promptUser
+		}
+		if v, ok := stringFrom(params, "user_prompt"); ok && p.UserPrompt == "" {
 			p.UserPrompt = v
 		}
 		if v, ok := floatFrom(params, "top_p"); ok {
diff --git a/internal/agent/component/agent_test.go b/internal/agent/component/agent_test.go
index 4434205225..f801d89960 100644
--- a/internal/agent/component/agent_test.go
+++ b/internal/agent/component/agent_test.go
@@ -28,6 +28,7 @@ import (
 	"github.com/cloudwego/eino/flow/agent/react"
 	"github.com/cloudwego/eino/schema"
 
+	"ragflow/internal/agent/runtime"
 	agenttool "ragflow/internal/agent/tool"
 )
 
@@ -69,6 +70,89 @@ func TestAgent_NoToolsReAct(t *testing.T) {
 	}
 }
 
+func TestAgent_ResolvesUserPromptFromCanvasState(t *testing.T) {
+	var gotPrompt string
+	withAgentRunner(t, func(_ context.Context, p AgentParam) (*schema.Message, error) {
+		gotPrompt = p.UserPrompt
+		return &schema.Message{Role: schema.Assistant, Content: "ok"}, nil
+	})
+
+	state := runtime.NewCanvasState("run-1", "task-1")
+	state.Sys["query"] = "what is marigold"
+	ctx := runtime.WithState(context.Background(), state)
+
+	c := NewAgentComponent(AgentParam{
+		ModelID:    "stub",
+		APIKey:     "test-key",
+		UserPrompt: "Question: {sys.query}",
+		MaxRounds:  1,
+	})
+	if _, err := c.Invoke(ctx, nil); err != nil {
+		t.Fatalf("Invoke: %v", err)
+	}
+	if gotPrompt != "Question: what is marigold" {
+		t.Fatalf("runner prompt = %q, want resolved sys.query", gotPrompt)
+	}
+}
+
+func TestAgent_UsesPromptsListForSysQuery(t *testing.T) {
+	var gotPrompt string
+	withAgentRunner(t, func(_ context.Context, p AgentParam) (*schema.Message, error) {
+		gotPrompt = p.UserPrompt
+		return &schema.Message{Role: schema.Assistant, Content: "ok"}, nil
+	})
+
+	cmp, err := New("Agent", map[string]any{
+		"model_id":    "stub",
+		"api_key":     "test-key",
+		"sys_prompt":  "act as assistant",
+		"user_prompt": "This is the order you need to send to the agent.",
+		"prompts": []any{
+			map[string]any{"role": "user", "content": "{sys.query}"},
+		},
+	})
+	if err != nil {
+		t.Fatalf("New(Agent): %v", err)
+	}
+
+	state := runtime.NewCanvasState("run-1", "task-1")
+	state.Sys["query"] = "用户真正的问题"
+	ctx := runtime.WithState(context.Background(), state)
+
+	if _, err := cmp.Invoke(ctx, nil); err != nil {
+		t.Fatalf("Invoke: %v", err)
+	}
+	if gotPrompt != "用户真正的问题" {
+		t.Fatalf("runner prompt = %q, want sys.query from prompts list", gotPrompt)
+	}
+}
+
+func TestAgent_FormatsRuntimePromptLikePython(t *testing.T) {
+	var gotPrompt string
+	withAgentRunner(t, func(_ context.Context, p AgentParam) (*schema.Message, error) {
+		gotPrompt = p.UserPrompt
+		return &schema.Message{Role: schema.Assistant, Content: "ok"}, nil
+	})
+
+	c := NewAgentComponent(AgentParam{
+		ModelID:   "stub",
+		APIKey:    "test-key",
+		MaxRounds: 1,
+	})
+	if _, err := c.Invoke(context.Background(), map[string]any{
+		"user_prompt": "write answer",
+		"reasoning":   "selected because it can answer",
+		"context":     "known facts",
+	}); err != nil {
+		t.Fatalf("Invoke: %v", err)
+	}
+
+	want := "\nREASONING:\nselected because it can answer\n\nCONTEXT:\nknown facts\n\nQUERY:\nwrite answer\n"
+	if gotPrompt != want {
+		t.Fatalf("runner prompt = %q, want %q", gotPrompt, want)
+	}
+}
+
 func TestAgent_ToolCallRound(t *testing.T) {
 	var calls int
 	withAgentRunner(t, func(_ context.Context, _ AgentParam) (*schema.Message, error) {
diff --git a/internal/agent/component/llm.go b/internal/agent/component/llm.go
index 46ccfe238a..3a9ad8c1de 100644
--- a/internal/agent/component/llm.go
+++ b/internal/agent/component/llm.go
@@ -218,14 +218,7 @@ func (e *einoChatInvoker) Invoke(ctx context.Context, req ChatInvokeRequest) (*C
 	if driver == "" {
 		driver = "dummy"
 	}
-	// baseURL: drivers consult map["default"] as the canonical endpoint
-	// (see internal/entity/models/base_model.go:GetBaseURL). When the
-	// caller did not override, leave the driver default in place by
-	// passing nil — every driver seeds its own map at construction time.
-	var baseURL map[string]string
-	if req.BaseURL != "" {
-		baseURL = map[string]string{"default": req.BaseURL}
-	}
+	baseURL := baseURLMapForDriver(driver, req.BaseURL)
 	// urlSuffix: each driver appends URLSuffix.Chat to baseURL to form
 	// the chat-completions endpoint (e.g. "chat/completions" for
 	// openai-compatible drivers, "v1/messages" for anthropic). The
@@ -333,6 +326,25 @@ func chatURLSuffixFor(driver string) models.URLSuffix {
 	}
 }
 
+func baseURLMapForDriver(driver, override string) map[string]string {
+	if override != "" {
+		return map[string]string{"default": override}
+	}
+	pm := models.GetProviderManager()
+	if pm == nil {
+		return nil
+	}
+	provider := pm.FindProvider(driver)
+	if provider == nil || len(provider.URL) == 0 {
+		return nil
+	}
+	baseURL := make(map[string]string, len(provider.URL))
+	for region, url := range provider.URL {
+		baseURL[region] = url
+	}
+	return baseURL
+}
+
 // NewLLMComponent builds an LLMComponent from raw params.
 func NewLLMComponent(p LLMParam) *LLMComponent {
 	return &LLMComponent{param: p}
diff --git a/internal/handler/agent.go b/internal/handler/agent.go
index 121b4b83d8..7ed78d1b37 100644
--- a/internal/handler/agent.go
+++ b/internal/handler/agent.go
@@ -1094,19 +1094,14 @@ func (h *AgentHandler) AgentChatCompletions(c *gin.Context) {
 	c.Writer.Header().Set("Content-Type", "text/event-stream")
 	c.Writer.Header().Set("Cache-Control", "no-cache")
 	c.Writer.Header().Set("Connection", "keep-alive")
-	// SSE wire format is the unified python envelope used by both
-	// /api/v1/agents/chat/completions and /api/v1/agentbots/<id>/completions.
-	// One frame per canvas event, all routed through
-	// service.WriteChatbotRunEvent so the two paths share one writer
-	// and one shape — see internal/service/bot_completion.go for the
-	// frame definition. The same unified envelope is used by the
-	// /api/v1/agents/{canvas_id}/run and /api/v1/agentbots/<id>/completions
-	// endpoints, all going through service.WriteChatbotRunEvent. The
-	// channel close is signalled by `data: [DONE]\n\n`. We do NOT emit
-	// an SSE `event:` line — the front-end's `use-send-message.ts`
+	// SSE wire format is the flat Python agent-canvas envelope:
+	// {event,message_id,task_id,session_id,created_at,data}. One
+	// frame is emitted per canvas event through service.WriteChatbotRunEvent.
+	// The channel close is signalled by `data: [DONE]\n\n`. We do NOT
+	// emit an SSE `event:` line — the front-end's use-send-message.ts
 	// parser feeds each `data:` line directly into JSON.parse and
-	// breaks on the `e` of `event:` (browser console: "SyntaxError:
-	// Unexpected token 'e', \"event: mes\"…").
+	// expects the event type in the JSON object's top-level `event`
+	// field.
 	emitted := false
 	for ev := range events {
 		emitted = true
diff --git a/internal/handler/agent_test.go b/internal/handler/agent_test.go
index 2dc6731eb3..ec86f0b530 100644
--- a/internal/handler/agent_test.go
+++ b/internal/handler/agent_test.go
@@ -730,10 +730,9 @@ func (s *stubChatRunner) RunAgent(_ context.Context, _, _, _, _ string, _ any) (
 // TestAgentChatCompletions_StreamSetsContentType covers the SSE
 // path: the handler streams canvas.RunEvent frames as
 // `data: {...}\n\n` with a trailing `data: [DONE]\n\n` terminator.
-// The frame shape is the unified python envelope
-// {code:0, message:"", data:{answer, reference, audio_binary, id,
-// session_id}} — the same shape /api/v1/agentbots/<id>/completions
-// emits. See service.WriteChatbotRunEvent and WriteChatbotFrame.
+// The frame shape is the Python agent-canvas envelope
+// {event,message_id,task_id,session_id,data:{content}}. See
+// service.WriteChatbotRunEvent.
 //
 // The stubChatRunner emits one `message` frame and one `done` frame
 // so the test verifies the body contains both the framed event and
@@ -749,7 +748,7 @@ func TestAgentChatCompletions_StreamSetsContentType(t *testing.T) {
 	c.Set("user_id", "u1")
 
 	runner := &stubChatRunner{events: []canvas.RunEvent{
-		{Type: "message", Data: `{"answer":"hi back","reference":[]}`},
+		{Type: "message", MessageID: "msg-1", TaskID: "task-1", SessionID: "sess-1", Data: `{"content":"hi back","reference":[]}`},
 		{Type: "done", Data: ""},
 	}}
 	h := &AgentHandler{chatRunner: runner}
@@ -759,12 +758,12 @@ func TestAgentChatCompletions_StreamSetsContentType(t *testing.T) {
 		t.Errorf("Content-Type = %q, want text/event-stream", got)
 	}
 	body := w.Body.String()
-	// Body must contain the unified python envelope (`code/data.answer`)
-	// and the [DONE] terminator. The iframe SDK JSON.parse()s `answer`
-	// to extract the inner fields, so the embedded JSON is double-encoded
-	// (escaped quotes inside the outer `"answer"` string).
-	if !strings.Contains(body, "\"code\":0") || !strings.Contains(body, `"answer":"{\"answer\":\"hi back\",\"reference\":[]}"`) {
-		t.Errorf("body should contain unified python envelope with answer, got %q", body)
+	if !strings.Contains(body, `"event":"message"`) ||
+		!strings.Contains(body, `"message_id":"msg-1"`) ||
+		!strings.Contains(body, `"task_id":"task-1"`) ||
+		!strings.Contains(body, `"session_id":"sess-1"`) ||
+		!strings.Contains(body, `"content":"hi back"`) {
+		t.Errorf("body should contain flat agent event with content, got %q", body)
 	}
 	if !strings.HasSuffix(body, "data: [DONE]\n\n") {
 		t.Errorf("body should end with [DONE] terminator, got %q", body)
@@ -775,8 +774,7 @@ func TestAgentChatCompletions_StreamSetsContentType(t *testing.T) {
 // scenario the user actually hit: `openai-compatible: false` with no
 // `stream` field on the body. The handler must still invoke the
 // canvas runner and stream the result as SSE — the SSE envelope is
-// the unified python shape shared with
-// /api/v1/agentbots/<id>/completions regardless of the stream flag.
+// the flat Python agent-canvas shape regardless of the stream flag.
 func TestAgentChatCompletions_DefaultBranchStreamsSSE(t *testing.T) {
 	gin.SetMode(gin.TestMode)
 	w := httptest.NewRecorder()
@@ -788,7 +786,7 @@ func TestAgentChatCompletions_DefaultBranchStreamsSSE(t *testing.T) {
 	c.Set("user_id", "u1")
 
 	runner := &stubChatRunner{events: []canvas.RunEvent{
-		{Type: "message", Data: `{"answer":"hello back","reference":[]}`},
+		{Type: "message", MessageID: "msg-2", TaskID: "task-2", SessionID: "sess-2", Data: `{"content":"hello back","reference":[]}`},
 		{Type: "done", Data: ""},
 	}}
 	h := &AgentHandler{chatRunner: runner}
@@ -798,8 +796,10 @@ func TestAgentChatCompletions_DefaultBranchStreamsSSE(t *testing.T) {
 		t.Errorf("Content-Type = %q, want text/event-stream (default branch must stream)", got)
 	}
 	body := w.Body.String()
-	if !strings.Contains(body, "\"code\":0") || !strings.Contains(body, `"answer":"{\"answer\":\"hello back\",\"reference\":[]}"`) {
-		t.Errorf("body should contain unified python envelope with answer, got %q", body)
+	if !strings.Contains(body, `"event":"message"`) ||
+		!strings.Contains(body, `"message_id":"msg-2"`) ||
+		!strings.Contains(body, `"content":"hello back"`) {
+		t.Errorf("body should contain flat agent event with content, got %q", body)
 	}
 	if !strings.HasSuffix(body, "data: [DONE]\n\n") {
 		t.Errorf("body should end with [DONE] terminator, got %q", body)
diff --git a/internal/service/bot_completion.go b/internal/service/bot_completion.go
index e61172ec66..647aba838c 100644
--- a/internal/service/bot_completion.go
+++ b/internal/service/bot_completion.go
@@ -154,30 +154,22 @@ func WriteDoneFrame(w http.ResponseWriter) error {
 	return nil
 }
 
-// WriteChatbotRunEvent translates one canvas.RunEvent into the
-// unified python-shaped chat-completion envelope (same shape as
-// WriteChatbotFrame). This unifies the SSE format across:
+// WriteChatbotRunEvent translates one canvas.RunEvent into the flat
+// Python agent-canvas SSE envelope:
 //
-//   - /api/v1/agents/chat/completions   (was: writeChatCompletionSSE)
-//   - /api/v1/agentbots/<id>/completions (was: WriteChatbotFrame per-event)
+//	data: {"event":"message","message_id":"...","task_id":"...",
+//	  "session_id":"...","created_at":123,"data":{"content":"..."}}\n\n
+//
+// This is intentionally different from WriteChatbotFrame's legacy
+// chatbot `{code,data:{answer:"..."}}` shape. The agent React page's
+// use-send-message.ts parser appends each parsed object directly to
+// answerList and expects top-level `event` / `message_id`, plus a
+// typed `data` payload. If RunEvent frames are double-wrapped in
+// data.answer, the browser receives bytes but cannot render the
+// assistant message or correlate the current Log panel.
 //
 // The "done" event type emits `data: [DONE]\n\n` (no envelope),
-// matching the OpenAI-style terminator and the existing
-// AgentbotCompletion wire.
-//
-// For non-done events, ev.Data is placed verbatim into the `answer`
-// field — callers pass canvas-runner output that is itself a JSON
-// string (e.g. `{"answer":"hi back","reference":[]}`); the iframe
-// SDK then JSON.parse()s the `answer` string to extract the inner
-// fields. This matches the existing AgentbotCompletion behaviour.
-//
-// The event type is forwarded as the `event` field of the envelope
-// (PR #14589) so the front-end can distinguish interactive
-// `user_inputs` / `workflow_finished` events from plain `message`
-// streams and render the UserFillUp form vs the assistant text.
-// Without this field the form UI never appears because the
-// iframe SDK has no way to know the canvas paused for human
-// input.
+// matching the Python agent API terminator.
 //
 // Returns the write error so callers can short-circuit; both nil
 // and io.ErrClosedPipe are tolerated because the client may have
@@ -193,13 +185,65 @@ func WriteChatbotRunEvent(w http.ResponseWriter, ev canvas.RunEvent) error {
 		}
 		return nil
 	}
-	f := ChatbotSSEFrame{
-		Event:     ev.Type,
-		Data:      ev.Data,
-		Reference: map[string]any{},
-		SessionID: ev.SessionID,
+
+	var data any = map[string]any{}
+	if ev.Data != "" {
+		if err := json.Unmarshal([]byte(ev.Data), &data); err != nil {
+			data = ev.Data
+		}
 	}
-	return WriteChatbotFrame(w, f)
+	if ev.Type == "error" {
+		msg := "an internal error occurred"
+		if m, ok := data.(map[string]any); ok {
+			if s, _ := m["message"].(string); s != "" {
+				msg = s
+			}
+		}
+		payload := map[string]any{
+			"code":    500,
+			"message": msg,
+			"data":    false,
+		}
+		return writeSSEJSON(w, payload)
+	}
+
+	payload := map[string]any{
+		"data":       data,
+		"created_at": ev.CreatedAt,
+	}
+	if ev.Type != "" {
+		payload["event"] = ev.Type
+	}
+	if ev.MessageID != "" {
+		payload["message_id"] = ev.MessageID
+	}
+	if ev.TaskID != "" {
+		payload["task_id"] = ev.TaskID
+	}
+	if ev.SessionID != "" {
+		payload["session_id"] = ev.SessionID
+	}
+	return writeSSEJSON(w, payload)
+}
+
+func writeSSEJSON(w http.ResponseWriter, payload map[string]any) error {
+	b, err := runtime.SafeJSONMarshal(payload)
+	if err != nil {
+		return err
+	}
+	if _, err := w.Write([]byte("data:")); err != nil {
+		return err
+	}
+	if _, err := w.Write(b); err != nil {
+		return err
+	}
+	if _, err := w.Write([]byte("\n\n")); err != nil {
+		return err
+	}
+	if flusher, ok := w.(http.Flusher); ok {
+		flusher.Flush()
+	}
+	return nil
 }
 
 // AgentbotSSEFrame mirrors ChatbotSSEFrame for the agentbot
diff --git a/internal/service/bot_completion_history_test.go b/internal/service/bot_completion_history_test.go
index 744c776d4b..a0989c9e5d 100644
--- a/internal/service/bot_completion_history_test.go
+++ b/internal/service/bot_completion_history_test.go
@@ -249,6 +249,8 @@ func TestWriteChatbotRunEvent_UserInputsEvent(t *testing.T) {
 	rec := &recordingResponseWriter{header: http.Header{}}
 	if err := WriteChatbotRunEvent(rec, canvas.RunEvent{
 		Type:      "user_inputs",
+		MessageID: "msg-1",
+		TaskID:    "task-1",
 		Data:      `{"components":[{"id":"email","type":"text","required":true}]}`,
 		SessionID: "sess-1",
 	}); err != nil {
@@ -258,9 +260,18 @@ func TestWriteChatbotRunEvent_UserInputsEvent(t *testing.T) {
 	if !strings.Contains(body, `"event":"user_inputs"`) {
 		t.Errorf("body missing event=user_inputs: %s", body)
 	}
+	if !strings.Contains(body, `"message_id":"msg-1"`) {
+		t.Errorf("body missing message_id: %s", body)
+	}
+	if !strings.Contains(body, `"task_id":"task-1"`) {
+		t.Errorf("body missing task_id: %s", body)
+	}
 	if !strings.Contains(body, `"session_id":"sess-1"`) {
 		t.Errorf("body missing session_id: %s", body)
 	}
+	if strings.Contains(body, `"answer":"`) {
+		t.Errorf("body should not wrap run events in data.answer: %s", body)
+	}
 }
 
 // TestWriteChatbotRunEvent_WorkflowFinishedEvent covers the second
@@ -270,7 +281,7 @@ func TestWriteChatbotRunEvent_WorkflowFinishedEvent(t *testing.T) {
 	rec := &recordingResponseWriter{header: http.Header{}}
 	if err := WriteChatbotRunEvent(rec, canvas.RunEvent{
 		Type:      "workflow_finished",
-		Data:      `{"answer":"done"}`,
+		Data:      `{"outputs":"done"}`,
 		SessionID: "sess-2",
 	}); err != nil {
 		t.Fatalf("WriteChatbotRunEvent: %v", err)
@@ -279,6 +290,9 @@ func TestWriteChatbotRunEvent_WorkflowFinishedEvent(t *testing.T) {
 	if !strings.Contains(body, `"event":"workflow_finished"`) {
 		t.Errorf("body missing event=workflow_finished: %s", body)
 	}
+	if !strings.Contains(body, `"outputs":"done"`) {
+		t.Errorf("body missing workflow output payload: %s", body)
+	}
 }
 
 // TestWriteChatbotRunEvent_MessageEventCarriesEvent ensures the
@@ -290,7 +304,8 @@ func TestWriteChatbotRunEvent_MessageEventCarriesEvent(t *testing.T) {
 	rec := &recordingResponseWriter{header: http.Header{}}
 	if err := WriteChatbotRunEvent(rec, canvas.RunEvent{
 		Type:      "message",
-		Data:      `{"answer":"hi"}`,
+		MessageID: "msg-3",
+		Data:      `{"content":"hi"}`,
 		SessionID: "sess-3",
 	}); err != nil {
 		t.Fatalf("WriteChatbotRunEvent: %v", err)
@@ -299,6 +314,12 @@ func TestWriteChatbotRunEvent_MessageEventCarriesEvent(t *testing.T) {
 	if !strings.Contains(body, `"event":"message"`) {
 		t.Errorf("message frame should carry event=message: %s", body)
 	}
+	if !strings.Contains(body, `"message_id":"msg-3"`) {
+		t.Errorf("message frame should carry top-level message_id: %s", body)
+	}
+	if !strings.Contains(body, `"content":"hi"`) {
+		t.Errorf("message frame should carry data.content: %s", body)
+	}
 }
 
 // recordingResponseWriter is a minimal http.ResponseWriter stub