fix: stop rewriting native responses input ids

backend/internal/service/openai_codex_transform.go

@@ -339,8 +339,9 @@ func filterCodexInput(input []any, preserveReferences bool) []any {
 		}
 		typ, _ := m["type"].(string)
 
-		// 修复 OpenAI 上游的最新校验："Expected an ID that begins with 'fc'"
-		fixIDPrefix := func(id string) string {
+		// 仅修正真正的 tool/function call 标识，避免误改普通 message/reasoning id；
+		// 若 item_reference 指向 legacy call_* 标识，则仅修正该引用本身。
+		fixCallIDPrefix := func(id string) string {
 			if id == "" || strings.HasPrefix(id, "fc") {
 				return id
 			}
@@ -358,8 +359,8 @@ func filterCodexInput(input []any, preserveReferences bool) []any {
 			for key, value := range m {
 				newItem[key] = value
 			}
-			if id, ok := newItem["id"].(string); ok && id != "" {
-				newItem["id"] = fixIDPrefix(id)
+			if id, ok := newItem["id"].(string); ok && strings.HasPrefix(id, "call_") {
+				newItem["id"] = fixCallIDPrefix(id)
 			}
 			filtered = append(filtered, newItem)
 			continue
@@ -390,7 +391,7 @@ func filterCodexInput(input []any, preserveReferences bool) []any {
 			}
 
 			if callID != "" {
-				fixedCallID := fixIDPrefix(callID)
+				fixedCallID := fixCallIDPrefix(callID)
 				if fixedCallID != callID {
 					ensureCopy()
 					newItem["call_id"] = fixedCallID
@@ -404,14 +405,6 @@ func filterCodexInput(input []any, preserveReferences bool) []any {
 			if !isCodexToolCallItemType(typ) {
 				delete(newItem, "call_id")
 			}
-		} else {
-			if id, ok := newItem["id"].(string); ok && id != "" {
-				fixedID := fixIDPrefix(id)
-				if fixedID != id {
-					ensureCopy()
-					newItem["id"] = fixedID
-				}
-			}
 		}
 
 		filtered = append(filtered, newItem)

backend/internal/service/openai_codex_transform_test.go

@@ -33,12 +33,63 @@ func TestApplyCodexOAuthTransform_ToolContinuationPreservesInput(t *testing.T) {
 	first, ok := input[0].(map[string]any)
 	require.True(t, ok)
 	require.Equal(t, "item_reference", first["type"])
-	require.Equal(t, "fc_ref1", first["id"])
+	require.Equal(t, "ref1", first["id"])
 
 	// 校验 input[1] 为 map，确保后续字段断言安全。
 	second, ok := input[1].(map[string]any)
 	require.True(t, ok)
-	require.Equal(t, "fc_o1", second["id"])
+	require.Equal(t, "o1", second["id"])
+	require.Equal(t, "fc1", second["call_id"])
+}
+
+func TestApplyCodexOAuthTransform_ToolContinuationPreservesNativeMessageAndReasoningIDs(t *testing.T) {
+	reqBody := map[string]any{
+		"model": "gpt-5.2",
+		"input": []any{
+			map[string]any{"type": "message", "id": "msg_0", "role": "user", "content": "hi"},
+			map[string]any{"type": "item_reference", "id": "rs_123"},
+		},
+		"tool_choice": "auto",
+	}
+
+	applyCodexOAuthTransform(reqBody, false, false)
+
+	input, ok := reqBody["input"].([]any)
+	require.True(t, ok)
+	require.Len(t, input, 2)
+
+	first, ok := input[0].(map[string]any)
+	require.True(t, ok)
+	require.Equal(t, "msg_0", first["id"])
+
+	second, ok := input[1].(map[string]any)
+	require.True(t, ok)
+	require.Equal(t, "rs_123", second["id"])
+}
+
+func TestApplyCodexOAuthTransform_ToolContinuationNormalizesToolReferenceIDsOnly(t *testing.T) {
+	reqBody := map[string]any{
+		"model": "gpt-5.2",
+		"input": []any{
+			map[string]any{"type": "item_reference", "id": "call_1"},
+			map[string]any{"type": "function_call_output", "call_id": "call_1", "output": "ok"},
+		},
+		"tool_choice": "auto",
+	}
+
+	applyCodexOAuthTransform(reqBody, false, false)
+
+	input, ok := reqBody["input"].([]any)
+	require.True(t, ok)
+	require.Len(t, input, 2)
+
+	first, ok := input[0].(map[string]any)
+	require.True(t, ok)
+	require.Equal(t, "fc1", first["id"])
+
+	second, ok := input[1].(map[string]any)
+	require.True(t, ok)
+	require.Equal(t, "fc1", second["call_id"])
 }
 
 func TestApplyCodexOAuthTransform_ExplicitStoreFalsePreserved(t *testing.T) {