fix(claude): 修复工具调用兼容与解析回退

- Claude 工具定义兼容 input_schema 与 function.parameters

- tool_calls 解析增加 thinking 回退与大小写无关工具名匹配

- 补充 claude/util 相关回归测试

internal/adapter/claude/handler_stream_test.go

@@ -183,6 +183,32 @@ func TestHandleClaudeStreamRealtimeToolSafety(t *testing.T) {
 	}
 }
 
+func TestHandleClaudeStreamRealtimeToolDetectionFromThinkingFallback(t *testing.T) {
+	h := &Handler{}
+	resp := makeClaudeSSEHTTPResponse(
+		`data: {"p":"response/thinking_content","v":"{\"tool_calls\":[{\"name\":\"search\""}`,
+		`data: {"p":"response/thinking_content","v":",\"input\":{\"q\":\"go\"}}]}"}`,
+		`data: [DONE]`,
+	)
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPost, "/anthropic/v1/messages", nil)
+
+	h.handleClaudeStreamRealtime(rec, req, resp, "claude-sonnet-4-5", []any{map[string]any{"role": "user", "content": "use tool"}}, true, false, []string{"search"})
+
+	frames := parseClaudeFrames(t, rec.Body.String())
+	foundToolUse := false
+	for _, f := range findClaudeFrames(frames, "content_block_start") {
+		contentBlock, _ := f.Payload["content_block"].(map[string]any)
+		if contentBlock["type"] == "tool_use" && contentBlock["name"] == "search" {
+			foundToolUse = true
+			break
+		}
+	}
+	if !foundToolUse {
+		t.Fatalf("expected tool_use block from thinking fallback, body=%s", rec.Body.String())
+	}
+}
+
 func TestHandleClaudeStreamRealtimeUpstreamErrorEvent(t *testing.T) {
 	h := &Handler{}
 	resp := makeClaudeSSEHTTPResponse(

internal/adapter/claude/handler_util_test.go

@@ -141,6 +141,34 @@ func TestBuildClaudeToolPromptMultipleTools(t *testing.T) {
 	}
 }
 
+func TestBuildClaudeToolPromptSupportsOpenAIStyleFunctionTool(t *testing.T) {
+	tools := []any{
+		map[string]any{
+			"type": "function",
+			"function": map[string]any{
+				"name":        "search",
+				"description": "Search via function tool",
+				"parameters": map[string]any{
+					"type": "object",
+					"properties": map[string]any{
+						"q": map[string]any{"type": "string"},
+					},
+				},
+			},
+		},
+	}
+	prompt := buildClaudeToolPrompt(tools)
+	if !containsStr(prompt, "Tool: search") {
+		t.Fatalf("expected OpenAI-style function tool name in prompt, got: %q", prompt)
+	}
+	if !containsStr(prompt, "Search via function tool") {
+		t.Fatalf("expected OpenAI-style function tool description in prompt, got: %q", prompt)
+	}
+	if !containsStr(prompt, "\"q\"") {
+		t.Fatalf("expected parameters schema serialized in prompt, got: %q", prompt)
+	}
+}
+
 func TestBuildClaudeToolPromptSkipsNonMap(t *testing.T) {
 	tools := []any{"not a map"}
 	prompt := buildClaudeToolPrompt(tools)
@@ -237,6 +265,21 @@ func TestExtractClaudeToolNamesNil(t *testing.T) {
 	}
 }
 
+func TestExtractClaudeToolNamesSupportsOpenAIStyleFunctionTool(t *testing.T) {
+	tools := []any{
+		map[string]any{
+			"type": "function",
+			"function": map[string]any{
+				"name": "search",
+			},
+		},
+	}
+	names := extractClaudeToolNames(tools)
+	if len(names) != 1 || names[0] != "search" {
+		t.Fatalf("expected [search], got %v", names)
+	}
+}
+
 // ─── toMessageMaps ───────────────────────────────────────────────────
 
 func TestToMessageMapsNormal(t *testing.T) {

internal/adapter/claude/handler_utils.go

@@ -46,9 +46,8 @@ func buildClaudeToolPrompt(tools []any) string {
 		if !ok {
 			continue
 		}
-		name, _ := m["name"].(string)
-		desc, _ := m["description"].(string)
-		schema, _ := json.Marshal(m["input_schema"])
+		name, desc, schemaObj := extractClaudeToolMeta(m)
+		schema, _ := json.Marshal(schemaObj)
 		parts = append(parts, fmt.Sprintf("Tool: %s\nDescription: %s\nParameters: %s", name, desc, schema))
 	}
 	parts = append(parts,
@@ -98,13 +97,43 @@ func extractClaudeToolNames(tools []any) []string {
 		if !ok {
 			continue
 		}
-		if name, ok := m["name"].(string); ok && name != "" {
+		name, _, _ := extractClaudeToolMeta(m)
+		if name != "" {
 			out = append(out, name)
 		}
 	}
 	return out
 }
 
+func extractClaudeToolMeta(m map[string]any) (string, string, any) {
+	name, _ := m["name"].(string)
+	desc, _ := m["description"].(string)
+	schemaObj := m["input_schema"]
+	if schemaObj == nil {
+		schemaObj = m["parameters"]
+	}
+
+	if fn, ok := m["function"].(map[string]any); ok {
+		if strings.TrimSpace(name) == "" {
+			name, _ = fn["name"].(string)
+		}
+		if strings.TrimSpace(desc) == "" {
+			desc, _ = fn["description"].(string)
+		}
+		if schemaObj == nil {
+			if v, ok := fn["input_schema"]; ok {
+				schemaObj = v
+			}
+		}
+		if schemaObj == nil {
+			if v, ok := fn["parameters"]; ok {
+				schemaObj = v
+			}
+		}
+	}
+	return strings.TrimSpace(name), strings.TrimSpace(desc), schemaObj
+}
+
 func toMessageMaps(v any) []map[string]any {
 	arr, ok := v.([]any)
 	if !ok {

internal/adapter/claude/stream_runtime_finalize.go

@@ -46,6 +46,9 @@ func (s *claudeStreamRuntime) finalize(stopReason string) {
 
 	if s.bufferToolContent {
 		detected := util.ParseToolCalls(finalText, s.toolNames)
+		if len(detected) == 0 && finalThinking != "" {
+			detected = util.ParseToolCalls(finalThinking, s.toolNames)
+		}
 		if len(detected) > 0 {
 			stopReason = "tool_use"
 			for i, tc := range detected {