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internal/agent/agent.go

@@ -195,6 +195,8 @@ type ChatMessage struct {
 	ToolCallID string     `json:"tool_call_id,omitempty"`
 	// ToolName 仅 tool 角色：从 Eino/轨迹 JSON 的 name 或 tool_name 恢复，供续跑构造 ToolMessage。
 	ToolName string `json:"tool_name,omitempty"`
+	// ReasoningContent 对应 OpenAI/DeepSeek 的 reasoning_content；思考模式 + 工具调用后续跑须回传（见 DeepSeek 文档）。
+	ReasoningContent string `json:"reasoning_content,omitempty"`
 }
 
 // MarshalJSON 自定义JSON序列化，将tool_calls中的arguments转换为JSON字符串
@@ -208,6 +210,9 @@ func (cm ChatMessage) MarshalJSON() ([]byte, error) {
 	if cm.Content != "" {
 		aux["content"] = cm.Content
 	}
+	if cm.ReasoningContent != "" {
+		aux["reasoning_content"] = cm.ReasoningContent
+	}
 
 	// 添加tool_call_id（如果存在）
 	if cm.ToolCallID != "" {
@@ -663,8 +668,8 @@ func (a *Agent) AgentLoopWithProgress(ctx context.Context, userInput string, his
 
 		// 检查是否有工具调用
 		if len(choice.Message.ToolCalls) > 0 {
-			// 思考内容：如果本轮启用了思考流式增量（thinking_stream_*），前端会去重；
+			// ReAct 助手正文流式增量（thinking_stream_*）在 UI 上归为「思考」；若与 streamId 重复则前端会去重。
-			// 同时也需要在该“思考阶段结束”时补一条可落库的 thinking（用于刷新后持久化展示）。
+			// 该条 thinking 用于刷新后持久化展示（与流式聚合一致）。
 			if choice.Message.Content != "" {
 				sendProgress("thinking", choice.Message.Content, map[string]interface{}{
 					"iteration": i + 1,

internal/database/conversation.go

@@ -25,14 +25,15 @@ type Conversation struct {
 
 // Message 消息
 type Message struct {
-	ID              string                   `json:"id"`
+	ID               string                   `json:"id"`
-	ConversationID  string                   `json:"conversationId"`
+	ConversationID string                   `json:"conversationId"`
-	Role            string                   `json:"role"`
+	Role             string                   `json:"role"`
-	Content         string                   `json:"content"`
+	Content          string                   `json:"content"`
-	MCPExecutionIDs []string                 `json:"mcpExecutionIds,omitempty"`
+	ReasoningContent string                   `json:"reasoningContent,omitempty"`
-	ProcessDetails  []map[string]interface{} `json:"processDetails,omitempty"`
+	MCPExecutionIDs  []string                 `json:"mcpExecutionIds,omitempty"`
-	CreatedAt       time.Time                `json:"createdAt"`
+	ProcessDetails   []map[string]interface{} `json:"processDetails,omitempty"`
-	UpdatedAt       time.Time                `json:"updatedAt"`
+	CreatedAt        time.Time                `json:"createdAt"`
+	UpdatedAt        time.Time                `json:"updatedAt"`
 }
 
 // CreateConversation 创建新对话
@@ -498,8 +499,8 @@ func (db *DB) AddMessage(conversationID, role, content string, mcpExecutionIDs [
 	}
 
 	_, err := db.Exec(
-		"INSERT INTO messages (id, conversation_id, role, content, mcp_execution_ids, created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?, ?)",
+		"INSERT INTO messages (id, conversation_id, role, content, reasoning_content, mcp_execution_ids, created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?)",
-		id, conversationID, role, content, mcpIDsJSON, now, now,
+		id, conversationID, role, content, "", mcpIDsJSON, now, now,
 	)
 	if err != nil {
 		return nil, fmt.Errorf("添加消息失败: %w", err)
@@ -523,10 +524,30 @@ func (db *DB) AddMessage(conversationID, role, content string, mcpExecutionIDs [
 	return message, nil
 }
 
+// UpdateAssistantMessageFinalize 更新助手消息终态（正文、MCP id、思考链聚合文本，供无轨迹回退时回放）。
+func (db *DB) UpdateAssistantMessageFinalize(messageID, content string, mcpExecutionIDs []string, reasoningContent string) error {
+	var mcpIDsJSON string
+	if len(mcpExecutionIDs) > 0 {
+		jsonData, err := json.Marshal(mcpExecutionIDs)
+		if err != nil {
+			return fmt.Errorf("序列化MCP执行ID失败: %w", err)
+		}
+		mcpIDsJSON = string(jsonData)
+	}
+	_, err := db.Exec(
+		"UPDATE messages SET content = ?, mcp_execution_ids = ?, reasoning_content = ?, updated_at = ? WHERE id = ?",
+		content, mcpIDsJSON, strings.TrimSpace(reasoningContent), time.Now(), messageID,
+	)
+	if err != nil {
+		return fmt.Errorf("更新助手消息失败: %w", err)
+	}
+	return nil
+}
+
 // GetMessages 获取对话的所有消息
 func (db *DB) GetMessages(conversationID string) ([]Message, error) {
 	rows, err := db.Query(
-		"SELECT id, conversation_id, role, content, mcp_execution_ids, created_at, updated_at FROM messages WHERE conversation_id = ? ORDER BY created_at ASC",
+		"SELECT id, conversation_id, role, content, reasoning_content, mcp_execution_ids, created_at, updated_at FROM messages WHERE conversation_id = ? ORDER BY created_at ASC",
 		conversationID,
 	)
 	if err != nil {
@@ -537,13 +558,17 @@ func (db *DB) GetMessages(conversationID string) ([]Message, error) {
 	var messages []Message
 	for rows.Next() {
 		var msg Message
+		var reasoning sql.NullString
 		var mcpIDsJSON sql.NullString
 		var createdAt string
 		var updatedAt sql.NullString
 
-		if err := rows.Scan(&msg.ID, &msg.ConversationID, &msg.Role, &msg.Content, &mcpIDsJSON, &createdAt, &updatedAt); err != nil {
+		if err := rows.Scan(&msg.ID, &msg.ConversationID, &msg.Role, &msg.Content, &reasoning, &mcpIDsJSON, &createdAt, &updatedAt); err != nil {
 			return nil, fmt.Errorf("扫描消息失败: %w", err)
 		}
+		if reasoning.Valid {
+			msg.ReasoningContent = reasoning.String
+		}
 
 		// 尝试多种时间格式解析
 		var err error
@@ -683,7 +708,7 @@ type ProcessDetail struct {
 	ID             string    `json:"id"`
 	MessageID      string    `json:"messageId"`
 	ConversationID string    `json:"conversationId"`
-	EventType      string    `json:"eventType"` // iteration, thinking, tool_calls_detected, tool_call, tool_result, progress, error
+	EventType      string    `json:"eventType"` // iteration, thinking, reasoning_chain, tool_calls_detected, tool_call, tool_result, progress, error
 	Message        string    `json:"message"`
 	Data           string    `json:"data"` // JSON格式的数据
 	CreatedAt      time.Time `json:"createdAt"`

internal/database/database.go

@@ -594,6 +594,25 @@ func (db *DB) migrateMessagesTable() error {
 
 	// 回填已有数据：让 updated_at 至少等于 created_at，避免前端出现空/当前时间回退。
 	_, _ = db.Exec("UPDATE messages SET updated_at = created_at WHERE updated_at IS NULL OR updated_at = ''")
+
+	// reasoning_content：DeepSeek 思考模式 + 工具调用续跑；与 last_react_input 互补，供消息表回退路径回放
+	var rcColCount int
+	errRC := db.QueryRow("SELECT COUNT(*) FROM pragma_table_info('messages') WHERE name='reasoning_content'").Scan(&rcColCount)
+	if errRC != nil {
+		if _, addErr := db.Exec("ALTER TABLE messages ADD COLUMN reasoning_content TEXT"); addErr != nil {
+			errMsg := strings.ToLower(addErr.Error())
+			if !strings.Contains(errMsg, "duplicate column") && !strings.Contains(errMsg, "already exists") {
+				return fmt.Errorf("添加 messages.reasoning_content 字段失败: %w", addErr)
+			}
+		}
+	} else if rcColCount == 0 {
+		if _, err := db.Exec("ALTER TABLE messages ADD COLUMN reasoning_content TEXT"); err != nil {
+			errMsg := strings.ToLower(err.Error())
+			if !strings.Contains(errMsg, "duplicate column") && !strings.Contains(errMsg, "already exists") {
+				return fmt.Errorf("添加 messages.reasoning_content 字段失败: %w", err)
+			}
+		}
+	}
 	return nil
 }
 

internal/multiagent/eino_adk_run_loop.go

@@ -15,6 +15,7 @@ import (
 
 	"cyberstrike-ai/internal/agent"
 	"cyberstrike-ai/internal/einomcp"
+	"cyberstrike-ai/internal/openai"
 
 	"github.com/cloudwego/eino/adk"
 	"github.com/cloudwego/eino/schema"
@@ -550,6 +551,7 @@ func runEinoADKAgentLoop(ctx context.Context, args *einoADKRunLoopArgs, baseMsgs
 			var mainAssistantBuf string
 			var mainAssistDupTarget string // 非空表示本段主助手流需缓冲至 EOF，与 execute 输出比对去重
 			var reasoningBuf string
+			var prevReasoningDisplay string // UI 用：剥离 Claude 内部 signature 尾缀后的累计展示
 			var streamRecvErr error
 			type streamMsg struct {
 				chunk *schema.Message
@@ -597,19 +599,29 @@ func runEinoADKAgentLoop(ctx context.Context, args *einoADKRunLoopArgs, baseMsgs
 						var reasoningDelta string
 						reasoningBuf, reasoningDelta = normalizeStreamingDelta(reasoningBuf, chunk.ReasoningContent)
 						if reasoningDelta != "" {
-							if reasoningStreamID == "" {
+							fullDisplay := openai.DisplayReasoningContent(reasoningBuf)
-								reasoningStreamID = fmt.Sprintf("eino-reasoning-%s-%d", conversationID, atomic.AddInt64(&reasoningStreamSeq, 1))
+							var displayDelta string
-								progress("thinking_stream_start", " ", map[string]interface{}{
+							if strings.HasPrefix(fullDisplay, prevReasoningDisplay) {
-									"streamId":      reasoningStreamID,
+								displayDelta = fullDisplay[len(prevReasoningDisplay):]
-									"source":        "eino",
+							} else {
-									"einoAgent":     ev.AgentName,
+								displayDelta = fullDisplay
-									"einoRole":      einoRoleTag(ev.AgentName),
+							}
-									"orchestration": orchMode,
+							prevReasoningDisplay = fullDisplay
+							if displayDelta != "" {
+								if reasoningStreamID == "" {
+									reasoningStreamID = fmt.Sprintf("eino-reasoning-%s-%d", conversationID, atomic.AddInt64(&reasoningStreamSeq, 1))
+									progress("reasoning_chain_stream_start", " ", map[string]interface{}{
+										"streamId":      reasoningStreamID,
+										"source":        "eino",
+										"einoAgent":     ev.AgentName,
+										"einoRole":      einoRoleTag(ev.AgentName),
+										"orchestration": orchMode,
+									})
+								}
+								progress("reasoning_chain_stream_delta", displayDelta, map[string]interface{}{
+									"streamId": reasoningStreamID,
 								})
 							}
-							progress("thinking_stream_delta", reasoningDelta, map[string]interface{}{
-								"streamId": reasoningStreamID,
-							})
 						}
 					}
 					if chunk.Content != "" {
@@ -777,7 +789,7 @@ func runEinoADKAgentLoop(ctx context.Context, args *einoADKRunLoopArgs, baseMsgs
 
 		if mv.Role == schema.Assistant {
 			if progress != nil && strings.TrimSpace(msg.ReasoningContent) != "" {
-				progress("thinking", strings.TrimSpace(msg.ReasoningContent), map[string]interface{}{
+				progress("reasoning_chain", openai.DisplayReasoningContent(strings.TrimSpace(msg.ReasoningContent)), map[string]interface{}{
 					"conversationId": conversationID,
 					"source":         "eino",
 					"einoAgent":      ev.AgentName,

internal/multiagent/eino_single_runner.go

@@ -13,6 +13,7 @@ import (
 	"cyberstrike-ai/internal/config"
 	"cyberstrike-ai/internal/einomcp"
 	"cyberstrike-ai/internal/openai"
+	"cyberstrike-ai/internal/reasoning"
 
 	einoopenai "github.com/cloudwego/eino-ext/components/model/openai"
 	"github.com/cloudwego/eino/adk"
@@ -37,6 +38,7 @@ func RunEinoSingleChatModelAgent(
 	history []agent.ChatMessage,
 	roleTools []string,
 	progress func(eventType, message string, data interface{}),
+	reasoningClient *reasoning.ClientIntent,
 ) (*RunResult, error) {
 	if appCfg == nil || ag == nil {
 		return nil, fmt.Errorf("eino single: 配置或 Agent 为空")
@@ -121,6 +123,7 @@ func RunEinoSingleChatModelAgent(
 		Model:      appCfg.OpenAI.Model,
 		HTTPClient: httpClient,
 	}
+	reasoning.ApplyToEinoChatModelConfig(baseModelCfg, &appCfg.OpenAI, reasoningClient)
 
 	mainModel, err := einoopenai.NewChatModel(ctx, baseModelCfg)
 	if err != nil {

internal/multiagent/eino_summarize.go

@@ -214,7 +214,7 @@ func summarizeFinalizeWithRecentAssistantToolTrail(
 		selectedCount++
 	}
 
-	// 还原时间顺序
+	// 还原时间顺序。round 内为原始 *schema.Message 指针，保留 ReasoningContent（DeepSeek 工具续跑所必需）。
 	selectedMsgs := make([]adk.Message, 0, 8)
 	for i := len(selectedRoundsReverse) - 1; i >= 0; i-- {
 		selectedMsgs = append(selectedMsgs, selectedRoundsReverse[i].messages...)

internal/multiagent/reasoning_trace.go

@@ -0,0 +1,52 @@
+package multiagent
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+)
+
+// AggregatedReasoningFromTraceJSON concatenates non-empty assistant `reasoning_content`
+// fields from last_react-style JSON (slice of message objects) in document order.
+// Used to persist on the single assistant bubble row for audit and for GetMessages fallback
+// when the full trace JSON is unavailable. For strict per-message replay, prefer last_react_input.
+func AggregatedReasoningFromTraceJSON(traceJSON string) string {
+	traceJSON = strings.TrimSpace(traceJSON)
+	if traceJSON == "" {
+		return ""
+	}
+	var arr []map[string]interface{}
+	if err := json.Unmarshal([]byte(traceJSON), &arr); err != nil {
+		return ""
+	}
+	var b strings.Builder
+	for _, m := range arr {
+		role, _ := m["role"].(string)
+		if !strings.EqualFold(strings.TrimSpace(role), "assistant") {
+			continue
+		}
+		rc := reasoningContentFromMessageMap(m)
+		if rc == "" {
+			continue
+		}
+		if b.Len() > 0 {
+			b.WriteByte('\n')
+		}
+		b.WriteString(rc)
+	}
+	return b.String()
+}
+
+func reasoningContentFromMessageMap(m map[string]interface{}) string {
+	if m == nil {
+		return ""
+	}
+	switch v := m["reasoning_content"].(type) {
+	case string:
+		return strings.TrimSpace(v)
+	case nil:
+		return ""
+	default:
+		return strings.TrimSpace(fmt.Sprint(v))
+	}
+}

internal/multiagent/reasoning_trace_test.go

@@ -0,0 +1,20 @@
+package multiagent
+
+import "testing"
+
+func TestAggregatedReasoningFromTraceJSON(t *testing.T) {
+	const j = `[
+{"role":"user","content":"hi"},
+{"role":"assistant","content":"c1","reasoning_content":"r1","tool_calls":[{"id":"1","type":"function","function":{"name":"f","arguments":"{}"}}]},
+{"role":"tool","tool_call_id":"1","content":"out"},
+{"role":"assistant","content":"c2","reasoning_content":"r2"}
+]`
+	got := AggregatedReasoningFromTraceJSON(j)
+	want := "r1\nr2"
+	if got != want {
+		t.Fatalf("got %q want %q", got, want)
+	}
+	if AggregatedReasoningFromTraceJSON("") != "" || AggregatedReasoningFromTraceJSON("[]") != "" {
+		t.Fatal("empty expected")
+	}
+}

internal/multiagent/runner.go

@@ -17,6 +17,7 @@ import (
 	"cyberstrike-ai/internal/config"
 	"cyberstrike-ai/internal/einomcp"
 	"cyberstrike-ai/internal/openai"
+	"cyberstrike-ai/internal/reasoning"
 
 	einoopenai "github.com/cloudwego/eino-ext/components/model/openai"
 	"github.com/cloudwego/eino/adk"
@@ -48,6 +49,7 @@ type toolCallPendingInfo struct {
 
 // RunDeepAgent 使用 Eino 多代理预置编排执行一轮对话（deep / plan_execute / supervisor；流式事件通过 progress 回调输出）。
 // orchestrationOverride 非空时优先（如聊天/WebShell 请求体）；否则用 multi_agent.orchestration（遗留 yaml）；皆空则按 deep。
+// reasoningClient 来自 ChatRequest.reasoning；可为 nil（机器人/批量等走全局 openai.reasoning）。
 func RunDeepAgent(
 	ctx context.Context,
 	appCfg *config.Config,
@@ -61,6 +63,7 @@ func RunDeepAgent(
 	progress func(eventType, message string, data interface{}),
 	agentsMarkdownDir string,
 	orchestrationOverride string,
+	reasoningClient *reasoning.ClientIntent,
 ) (*RunResult, error) {
 	if appCfg == nil || ma == nil || ag == nil {
 		return nil, fmt.Errorf("multiagent: 配置或 Agent 为空")
@@ -163,6 +166,7 @@ func RunDeepAgent(
 		Model:      appCfg.OpenAI.Model,
 		HTTPClient: httpClient,
 	}
+	reasoning.ApplyToEinoChatModelConfig(baseModelCfg, &appCfg.OpenAI, reasoningClient)
 
 	deepMaxIter := ma.MaxIteration
 	if deepMaxIter <= 0 {
@@ -636,8 +640,13 @@ func historyToMessages(history []agent.ChatMessage, appCfg *config.Config, mwCfg
 			}
 		case "assistant":
 			toolSchema := chatToolCallsToSchema(h.ToolCalls)
-			if len(toolSchema) > 0 || strings.TrimSpace(h.Content) != "" {
+			hasRC := strings.TrimSpace(h.ReasoningContent) != ""
-				raw = append(raw, schema.AssistantMessage(h.Content, toolSchema))
+			if len(toolSchema) > 0 || strings.TrimSpace(h.Content) != "" || hasRC {
+				am := schema.AssistantMessage(h.Content, toolSchema)
+				if hasRC {
+					am.ReasoningContent = strings.TrimSpace(h.ReasoningContent)
+				}
+				raw = append(raw, am)
 			}
 		case "tool":
 			if strings.TrimSpace(h.ToolCallID) == "" && strings.TrimSpace(h.Content) == "" {

internal/multiagent/runner_reasoning_history_test.go

@@ -0,0 +1,22 @@
+package multiagent
+
+import (
+	"testing"
+
+	"cyberstrike-ai/internal/agent"
+)
+
+func TestHistoryToMessagesPreservesReasoningContent(t *testing.T) {
+	h := []agent.ChatMessage{
+		{Role: "user", Content: "u"},
+		{Role: "assistant", Content: "c", ReasoningContent: "r1", ToolCalls: []agent.ToolCall{{ID: "t1", Type: "function", Function: agent.FunctionCall{Name: "f", Arguments: map[string]interface{}{}}}}},
+	}
+	msgs := historyToMessages(h, nil, nil)
+	if len(msgs) != 2 {
+		t.Fatalf("len=%d", len(msgs))
+	}
+	am := msgs[1]
+	if am.ReasoningContent != "r1" || am.Content != "c" {
+		t.Fatalf("got reasoning=%q content=%q", am.ReasoningContent, am.Content)
+	}
+}

internal/openai/claude_bridge.go

@@ -9,6 +9,9 @@ package openai
 //   Stream:   Claude SSE (event: content_block_delta / message_delta) → OpenAI SSE 格式
 //   Auth:     Bearer → x-api-key
 //   Tools:    OpenAI tools[] → Claude tools[] (input_schema)
+//
+// Extended thinking: 顶层 `thinking` 从 OpenAI 请求体透传；响应中 `thinking` block 映射为
+// `reasoning_content`（可读前缀 + 内部 JSON 尾缀以保留 signature，供多轮工具续跑；UI 用 openai.DisplayReasoningContent 剥离）。
 
 import (
 	"bufio"
@@ -38,6 +41,7 @@ type claudeRequest struct {
 	Messages  []claudeMessage `json:"messages"`
 	Tools     []claudeTool    `json:"tools,omitempty"`
 	Stream    bool            `json:"stream,omitempty"`
+	Thinking  json.RawMessage `json:"thinking,omitempty"`
 }
 
 type claudeMessage struct {
@@ -76,6 +80,10 @@ type claudeContentBlock struct {
 	// text block
 	Text string `json:"text,omitempty"`
 
+	// thinking block (extended thinking)
+	Thinking  string `json:"thinking,omitempty"`
+	Signature string `json:"signature,omitempty"`
+
 	// tool_use block (assistant 返回)
 	ID    string          `json:"id,omitempty"`
 	Name  string          `json:"name,omitempty"`
@@ -176,7 +184,13 @@ func convertOpenAIToClaude(payload interface{}) (*claudeRequest, error) {
 
 		// tool_calls (assistant 消息中包含工具调用)
 		if role == "assistant" {
+			rc, _ := mm["reasoning_content"].(string)
+			_, thinkingReplay := parseClaudeReasoningAssistantBlocks(rc)
+
 			var blocks []claudeContentBlock
+			for _, tb := range thinkingReplay {
+				blocks = append(blocks, tb)
+			}
 			if content != "" {
 				blocks = append(blocks, claudeContentBlock{Type: "text", Text: content})
 			}
@@ -290,6 +304,13 @@ func convertOpenAIToClaude(payload interface{}) (*claudeRequest, error) {
 		}
 	}
 
+	// Extended thinking (Anthropic top-level); merged from Eino ExtraFields / admin extras.
+	if th, ok := oai["thinking"]; ok && th != nil {
+		if raw, err := json.Marshal(th); err == nil && len(raw) > 0 && string(raw) != "null" {
+			req.Thinking = json.RawMessage(raw)
+		}
+	}
+
 	return req, nil
 }
 
@@ -318,9 +339,12 @@ func claudeToOpenAIResponseJSON(claudeBody []byte) ([]byte, error) {
 
 	var textContent string
 	var toolCalls []interface{}
+	var thinkingBlocks []claudeContentBlock
 
 	for _, block := range cr.Content {
 		switch block.Type {
+		case "thinking":
+			thinkingBlocks = append(thinkingBlocks, block)
 		case "text":
 			textContent += block.Text
 		case "tool_use":
@@ -344,6 +368,18 @@ func claudeToOpenAIResponseJSON(claudeBody []byte) ([]byte, error) {
 	if len(toolCalls) > 0 {
 		message["tool_calls"] = toolCalls
 	}
+	if len(thinkingBlocks) > 0 {
+		var parts []string
+		for _, tb := range thinkingBlocks {
+			if strings.TrimSpace(tb.Thinking) != "" {
+				parts = append(parts, tb.Thinking)
+			}
+		}
+		rc := appendClaudeReasoningRoundTrip(strings.Join(parts, "\n\n"), thinkingBlocks)
+		if rc != "" {
+			message["reasoning_content"] = rc
+		}
+	}
 
 	choice := map[string]interface{}{
 		"index":         0,
@@ -901,8 +937,16 @@ func (rt *claudeRoundTripper) RoundTrip(req *http.Request) (*http.Response, erro
 
 		reader := bufio.NewReader(resp.Body)
 		blockToToolIndex := make(map[int]int)
+		blockIndexToType := make(map[int]string)
 		nextToolIndex := 0
 
+		type thinkingAcc struct {
+			text strings.Builder
+			sig  strings.Builder
+		}
+		thinkingByIndex := make(map[int]*thinkingAcc)
+		var finishedThinking []claudeContentBlock
+
 		for {
 			line, readErr := reader.ReadString('\n')
 			if readErr != nil {
@@ -947,6 +991,11 @@ func (rt *claudeRoundTripper) RoundTrip(req *http.Request) (*http.Response, erro
 				blockIdx := int(blockIdxFlt)
 				cb, _ := event["content_block"].(map[string]interface{})
 				bt, _ := cb["type"].(string)
+				blockIndexToType[blockIdx] = bt
+
+				if bt == "thinking" {
+					thinkingByIndex[blockIdx] = &thinkingAcc{}
+				}
 
 				if bt == "tool_use" {
 					id, _ := cb["id"].(string)
@@ -986,7 +1035,35 @@ func (rt *claudeRoundTripper) RoundTrip(req *http.Request) (*http.Response, erro
 				delta, _ := event["delta"].(map[string]interface{})
 				dt, _ := delta["type"].(string)
 
-				if dt == "text_delta" {
+				if dt == "thinking_delta" {
+					tPart, _ := delta["thinking"].(string)
+					if tPart != "" {
+						if acc := thinkingByIndex[blockIdx]; acc != nil {
+							acc.text.WriteString(tPart)
+						}
+						oaiChunk := map[string]interface{}{
+							"choices": []map[string]interface{}{
+								{
+									"delta": map[string]interface{}{
+										"reasoning_content": tPart,
+									},
+								},
+							},
+						}
+						b, _ := json.Marshal(oaiChunk)
+						if !writeLine("data: " + string(b) + "\n\n") {
+							pw.Close()
+							return
+						}
+					}
+				} else if dt == "signature_delta" {
+					sigPart, _ := delta["signature"].(string)
+					if sigPart != "" {
+						if acc := thinkingByIndex[blockIdx]; acc != nil {
+							acc.sig.WriteString(sigPart)
+						}
+					}
+				} else if dt == "text_delta" {
 					text, _ := delta["text"].(string)
 					oaiChunk := map[string]interface{}{
 						"choices": []map[string]interface{}{
@@ -1031,6 +1108,21 @@ func (rt *claudeRoundTripper) RoundTrip(req *http.Request) (*http.Response, erro
 					}
 				}
 
+			case "content_block_stop":
+				blockIdxFlt, _ := event["index"].(float64)
+				blockIdx := int(blockIdxFlt)
+				bt := blockIndexToType[blockIdx]
+				if bt == "thinking" {
+					if acc := thinkingByIndex[blockIdx]; acc != nil {
+						finishedThinking = append(finishedThinking, claudeContentBlock{
+							Type:      "thinking",
+							Thinking:  acc.text.String(),
+							Signature: acc.sig.String(),
+						})
+						delete(thinkingByIndex, blockIdx)
+					}
+				}
+
 			case "message_delta":
 				d, _ := event["delta"].(map[string]interface{})
 				if sr, ok := d["stop_reason"].(string); ok {
@@ -1051,6 +1143,25 @@ func (rt *claudeRoundTripper) RoundTrip(req *http.Request) (*http.Response, erro
 				}
 
 			case "message_stop":
+				if len(finishedThinking) > 0 {
+					suffix := appendClaudeReasoningRoundTrip("", finishedThinking)
+					if strings.TrimSpace(suffix) != "" {
+						oaiChunk := map[string]interface{}{
+							"choices": []map[string]interface{}{
+								{
+									"delta": map[string]interface{}{
+										"reasoning_content": suffix,
+									},
+								},
+							},
+						}
+						b, _ := json.Marshal(oaiChunk)
+						if !writeLine("data: " + string(b) + "\n\n") {
+							pw.Close()
+							return
+						}
+					}
+				}
 				writeLine("data: [DONE]\n\n")
 				pw.Close()
 				return

internal/openai/claude_reasoning_roundtrip.go

@@ -0,0 +1,81 @@
+package openai
+
+import (
+	"encoding/json"
+	"strings"
+)
+
+// claudeReasoningRoundTripSep separates human-readable reasoning from a JSON payload of
+// Anthropic thinking blocks (with signatures) for multi-turn extended thinking + tools.
+// Not shown in UI (see DisplayReasoningContent).
+const claudeReasoningRoundTripSep = "\n---CSAI_CLAUDE_THINKING_BLOCKS---\n"
+
+// DisplayReasoningContent returns reasoning text suitable for the UI (strips internal
+// Claude round-trip JSON suffix). Safe for DeepSeek/plain reasoning strings (no-op).
+func DisplayReasoningContent(s string) string {
+	s = strings.TrimSpace(s)
+	if s == "" {
+		return ""
+	}
+	i := strings.LastIndex(s, claudeReasoningRoundTripSep)
+	if i < 0 {
+		return s
+	}
+	return strings.TrimSpace(s[:i])
+}
+
+func appendClaudeReasoningRoundTrip(display string, blocks []claudeContentBlock) string {
+	var payload []map[string]string
+	for _, b := range blocks {
+		if b.Type != "thinking" {
+			continue
+		}
+		payload = append(payload, map[string]string{
+			"type":      b.Type,
+			"thinking":  b.Thinking,
+			"signature": b.Signature,
+		})
+	}
+	if len(payload) == 0 {
+		return strings.TrimSpace(display)
+	}
+	js, err := json.Marshal(payload)
+	if err != nil {
+		return strings.TrimSpace(display)
+	}
+	d := strings.TrimSpace(display)
+	if d == "" {
+		return claudeReasoningRoundTripSep + string(js)
+	}
+	return d + claudeReasoningRoundTripSep + string(js)
+}
+
+// parseClaudeReasoningAssistantBlocks extracts Anthropic thinking blocks from an OpenAI-style
+// reasoning_content string. When no suffix is present, blocks is nil (caller must not invent signatures).
+func parseClaudeReasoningAssistantBlocks(reasoningContent string) (display string, blocks []claudeContentBlock) {
+	reasoningContent = strings.TrimSpace(reasoningContent)
+	if reasoningContent == "" {
+		return "", nil
+	}
+	idx := strings.LastIndex(reasoningContent, claudeReasoningRoundTripSep)
+	if idx < 0 {
+		return reasoningContent, nil
+	}
+	display = strings.TrimSpace(reasoningContent[:idx])
+	jsonPart := strings.TrimSpace(reasoningContent[idx+len(claudeReasoningRoundTripSep):])
+	var arr []struct {
+		Type      string `json:"type"`
+		Thinking  string `json:"thinking"`
+		Signature string `json:"signature"`
+	}
+	if err := json.Unmarshal([]byte(jsonPart), &arr); err != nil {
+		return reasoningContent, nil
+	}
+	for _, x := range arr {
+		if x.Type != "thinking" {
+			continue
+		}
+		blocks = append(blocks, claudeContentBlock{Type: "thinking", Thinking: x.Thinking, Signature: x.Signature})
+	}
+	return display, blocks
+}

internal/openai/claude_reasoning_roundtrip_test.go

@@ -0,0 +1,102 @@
+package openai
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+)
+
+func TestDisplayReasoningContent(t *testing.T) {
+	raw := "hello" + claudeReasoningRoundTripSep + `[{"type":"thinking","thinking":"x","signature":"sig"}]`
+	if d := DisplayReasoningContent(raw); d != "hello" {
+		t.Fatalf("got %q", d)
+	}
+	if DisplayReasoningContent("plain") != "plain" {
+		t.Fatal()
+	}
+}
+
+func TestAppendParseClaudeReasoningRoundTrip(t *testing.T) {
+	blocks := []claudeContentBlock{
+		{Type: "thinking", Thinking: "a", Signature: "s1"},
+		{Type: "thinking", Thinking: "b", Signature: "s2"},
+	}
+	s := appendClaudeReasoningRoundTrip("sum", blocks)
+	if !strings.Contains(s, claudeReasoningRoundTripSep) {
+		t.Fatal("missing sep")
+	}
+	display, back := parseClaudeReasoningAssistantBlocks(s)
+	if display != "sum" || len(back) != 2 {
+		t.Fatalf("display=%q len=%d", display, len(back))
+	}
+	if back[0].Signature != "s1" || back[1].Thinking != "b" {
+		t.Fatalf("%+v", back)
+	}
+}
+
+func TestConvertOpenAIToClaude_AssistantReasoningReplay(t *testing.T) {
+	rc := appendClaudeReasoningRoundTrip("vis", []claudeContentBlock{
+		{Type: "thinking", Thinking: "t1", Signature: "sig1"},
+	})
+	payload := map[string]interface{}{
+		"model": "claude-3-5-sonnet-latest",
+		"messages": []interface{}{
+			map[string]interface{}{
+				"role":              "assistant",
+				"content":           "out",
+				"reasoning_content": rc,
+			},
+		},
+	}
+	req, err := convertOpenAIToClaude(payload)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(req.Messages) != 1 {
+		t.Fatalf("messages=%d", len(req.Messages))
+	}
+	blocks := req.Messages[0].Content.Blocks
+	if len(blocks) < 2 {
+		t.Fatalf("blocks=%d", len(blocks))
+	}
+	if blocks[0].Type != "thinking" || blocks[0].Signature != "sig1" {
+		t.Fatalf("first block %+v", blocks[0])
+	}
+	foundText := false
+	for _, b := range blocks {
+		if b.Type == "text" && b.Text == "out" {
+			foundText = true
+		}
+	}
+	if !foundText {
+		t.Fatalf("blocks=%+v", blocks)
+	}
+}
+
+func TestClaudeToOpenAIResponseJSON_Thinking(t *testing.T) {
+	claudeBody := []byte(`{
+		"id":"msg_1","type":"message","role":"assistant","model":"x","stop_reason":"end_turn",
+		"content":[
+			{"type":"thinking","thinking":"step","signature":"sigx"},
+			{"type":"text","text":"hi"}
+		]
+	}`)
+	oai, err := claudeToOpenAIResponseJSON(claudeBody)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var wrap map[string]interface{}
+	if err := json.Unmarshal(oai, &wrap); err != nil {
+		t.Fatal(err)
+	}
+	choices := wrap["choices"].([]interface{})
+	ch0 := choices[0].(map[string]interface{})
+	msg := ch0["message"].(map[string]interface{})
+	rc, _ := msg["reasoning_content"].(string)
+	if !strings.Contains(rc, "step") || !strings.Contains(rc, claudeReasoningRoundTripSep) {
+		t.Fatalf("reasoning_content=%q", rc)
+	}
+	if msg["content"] != "hi" {
+		t.Fatal()
+	}
+}