fix(openai): 增强 Codex 工具过滤和参数标准化

- codex_transform: 过滤无效工具，支持 Responses-style 和 ChatCompletions-style 格式
- tool_corrector: 添加 fetch 工具映射，修正 bash/edit 参数命名规范

backend/internal/service/openai_codex_transform.go

@@ -394,19 +394,35 @@ func normalizeCodexTools(reqBody map[string]any) bool {
 	}
 
 	modified := false
-	for idx, tool := range tools {
+	validTools := make([]any, 0, len(tools))
+
+	for _, tool := range tools {
 		toolMap, ok := tool.(map[string]any)
 		if !ok {
+			// Keep unknown structure as-is to avoid breaking upstream behavior.
+			validTools = append(validTools, tool)
 			continue
 		}
 
 		toolType, _ := toolMap["type"].(string)
-		if strings.TrimSpace(toolType) != "function" {
+		toolType = strings.TrimSpace(toolType)
+		if toolType != "function" {
+			validTools = append(validTools, toolMap)
 			continue
 		}
 
-		function, ok := toolMap["function"].(map[string]any)
-		if !ok {
+		// OpenAI Responses-style tools use top-level name/parameters.
+		if name, ok := toolMap["name"].(string); ok && strings.TrimSpace(name) != "" {
+			validTools = append(validTools, toolMap)
+			continue
+		}
+
+		// ChatCompletions-style tools use {type:"function", function:{...}}.
+		functionValue, hasFunction := toolMap["function"]
+		function, ok := functionValue.(map[string]any)
+		if !hasFunction || functionValue == nil || !ok || function == nil {
+			// Drop invalid function tools.
+			modified = true
 			continue
 		}
 
@@ -435,11 +451,11 @@ func normalizeCodexTools(reqBody map[string]any) bool {
 			}
 		}
 
-		tools[idx] = toolMap
+		validTools = append(validTools, toolMap)
 	}
 
 	if modified {
-		reqBody["tools"] = tools
+		reqBody["tools"] = validTools
 	}
 
 	return modified

backend/internal/service/openai_codex_transform_test.go

@@ -129,6 +129,37 @@ func TestFilterCodexInput_RemovesItemReferenceWhenNotPreserved(t *testing.T) {
 	require.False(t, hasID)
 }
 
+func TestApplyCodexOAuthTransform_NormalizeCodexTools_PreservesResponsesFunctionTools(t *testing.T) {
+	setupCodexCache(t)
+
+	reqBody := map[string]any{
+		"model": "gpt-5.1",
+		"tools": []any{
+			map[string]any{
+				"type":        "function",
+				"name":        "bash",
+				"description": "desc",
+				"parameters":  map[string]any{"type": "object"},
+			},
+			map[string]any{
+				"type":     "function",
+				"function": nil,
+			},
+		},
+	}
+
+	applyCodexOAuthTransform(reqBody)
+
+	tools, ok := reqBody["tools"].([]any)
+	require.True(t, ok)
+	require.Len(t, tools, 1)
+
+	first, ok := tools[0].(map[string]any)
+	require.True(t, ok)
+	require.Equal(t, "function", first["type"])
+	require.Equal(t, "bash", first["name"])
+}
+
 func TestApplyCodexOAuthTransform_EmptyInput(t *testing.T) {
 	// 空 input 应保持为空且不触发异常。
 	setupCodexCache(t)

backend/internal/service/openai_tool_corrector.go

@@ -27,6 +27,11 @@ var codexToolNameMapping = map[string]string{
 	"executeBash":  "bash",
 	"exec_bash":    "bash",
 	"execBash":     "bash",
+
+	// Some clients output generic fetch names.
+	"fetch":     "webfetch",
+	"web_fetch": "webfetch",
+	"webFetch":  "webfetch",
 }
 
 // ToolCorrectionStats 记录工具修正的统计信息（导出用于 JSON 序列化）
@@ -208,27 +213,67 @@ func (c *CodexToolCorrector) correctToolParameters(toolName string, functionCall
 	// 根据工具名称应用特定的参数修正规则
 	switch toolName {
 	case "bash":
-		// 移除 workdir 参数（OpenCode 不支持）
-		if _, exists := argsMap["workdir"]; exists {
-			delete(argsMap, "workdir")
+		// OpenCode bash 支持 workdir；有些来源会输出 work_dir。
+		if _, hasWorkdir := argsMap["workdir"]; !hasWorkdir {
+			if workDir, exists := argsMap["work_dir"]; exists {
+				argsMap["workdir"] = workDir
+				delete(argsMap, "work_dir")
 				corrected = true
-			log.Printf("[CodexToolCorrector] Removed 'workdir' parameter from bash tool")
+				log.Printf("[CodexToolCorrector] Renamed 'work_dir' to 'workdir' in bash tool")
 			}
+		} else {
 			if _, exists := argsMap["work_dir"]; exists {
 				delete(argsMap, "work_dir")
 				corrected = true
-			log.Printf("[CodexToolCorrector] Removed 'work_dir' parameter from bash tool")
+				log.Printf("[CodexToolCorrector] Removed duplicate 'work_dir' parameter from bash tool")
+			}
 		}
 
 	case "edit":
-		// OpenCode edit 使用 old_string/new_string，Codex 可能使用其他名称
-		// 这里可以添加参数名称的映射逻辑
-		if _, exists := argsMap["file_path"]; !exists {
-			if path, exists := argsMap["path"]; exists {
-				argsMap["file_path"] = path
+		// OpenCode edit 参数为 filePath/oldString/newString（camelCase）。
+		if _, exists := argsMap["filePath"]; !exists {
+			if filePath, exists := argsMap["file_path"]; exists {
+				argsMap["filePath"] = filePath
+				delete(argsMap, "file_path")
+				corrected = true
+				log.Printf("[CodexToolCorrector] Renamed 'file_path' to 'filePath' in edit tool")
+			} else if filePath, exists := argsMap["path"]; exists {
+				argsMap["filePath"] = filePath
 				delete(argsMap, "path")
 				corrected = true
-				log.Printf("[CodexToolCorrector] Renamed 'path' to 'file_path' in edit tool")
+				log.Printf("[CodexToolCorrector] Renamed 'path' to 'filePath' in edit tool")
+			} else if filePath, exists := argsMap["file"]; exists {
+				argsMap["filePath"] = filePath
+				delete(argsMap, "file")
+				corrected = true
+				log.Printf("[CodexToolCorrector] Renamed 'file' to 'filePath' in edit tool")
+			}
+		}
+
+		if _, exists := argsMap["oldString"]; !exists {
+			if oldString, exists := argsMap["old_string"]; exists {
+				argsMap["oldString"] = oldString
+				delete(argsMap, "old_string")
+				corrected = true
+				log.Printf("[CodexToolCorrector] Renamed 'old_string' to 'oldString' in edit tool")
+			}
+		}
+
+		if _, exists := argsMap["newString"]; !exists {
+			if newString, exists := argsMap["new_string"]; exists {
+				argsMap["newString"] = newString
+				delete(argsMap, "new_string")
+				corrected = true
+				log.Printf("[CodexToolCorrector] Renamed 'new_string' to 'newString' in edit tool")
+			}
+		}
+
+		if _, exists := argsMap["replaceAll"]; !exists {
+			if replaceAll, exists := argsMap["replace_all"]; exists {
+				argsMap["replaceAll"] = replaceAll
+				delete(argsMap, "replace_all")
+				corrected = true
+				log.Printf("[CodexToolCorrector] Renamed 'replace_all' to 'replaceAll' in edit tool")
 			}
 		}
 	}

backend/internal/service/openai_tool_corrector_test.go

@@ -416,22 +416,23 @@ func TestCorrectToolParameters(t *testing.T) {
 		expected map[string]bool // key: 期待存在的参数, value: true表示应该存在
 	}{
 		{
-			name: "remove workdir from bash tool",
+			name: "rename work_dir to workdir in bash tool",
 			input: `{
 				"tool_calls": [{
 					"function": {
 						"name": "bash",
-						"arguments": "{\"command\":\"ls\",\"workdir\":\"/tmp\"}"
+						"arguments": "{\"command\":\"ls\",\"work_dir\":\"/tmp\"}"
 					}
 				}]
 			}`,
 			expected: map[string]bool{
 				"command":  true,
-				"workdir": false,
+				"workdir":  true,
+				"work_dir": false,
 			},
 		},
 		{
-			name: "rename path to file_path in edit tool",
+			name: "rename snake_case edit params to camelCase",
 			input: `{
 				"tool_calls": [{
 					"function": {
@@ -441,10 +442,12 @@ func TestCorrectToolParameters(t *testing.T) {
 				}]
 			}`,
 			expected: map[string]bool{
-				"file_path":  true,
+				"filePath":   true,
 				"path":       false,
-				"old_string": true,
-				"new_string": true,
+				"oldString":  true,
+				"old_string": false,
+				"newString":  true,
+				"new_string": false,
 			},
 		},
 	}