refactor(util, executor): optimize payload handling and schema processing

- Replaced repetitive string operations with a centralized `escapeGJSONPathKey` function.
- Streamlined handling of JSON schema cleaning for Gemini and Antigravity requests.
- Improved payload management by transitioning from byte slices to strings for processing.
- Removed unnecessary cloning of byte slices in several places.

internal/runtime/executor/antigravity_executor.go

@@ -1280,51 +1280,40 @@ func (e *AntigravityExecutor) buildRequest(ctx context.Context, auth *cliproxyau
 	payload = geminiToAntigravity(modelName, payload, projectID)
 	payload, _ = sjson.SetBytes(payload, "model", modelName)
 
-	if strings.Contains(modelName, "claude") || strings.Contains(modelName, "gemini-3-pro-high") {
-		strJSON := string(payload)
-		paths := make([]string, 0)
-		util.Walk(gjson.ParseBytes(payload), "", "parametersJsonSchema", &paths)
-		for _, p := range paths {
-			strJSON, _ = util.RenameKey(strJSON, p, p[:len(p)-len("parametersJsonSchema")]+"parameters")
-		}
-
-		// Use the centralized schema cleaner to handle unsupported keywords,
-		// const->enum conversion, and flattening of types/anyOf.
-		strJSON = util.CleanJSONSchemaForAntigravity(strJSON)
-		payload = []byte(strJSON)
-	} else {
-		strJSON := string(payload)
-		paths := make([]string, 0)
-		util.Walk(gjson.Parse(strJSON), "", "parametersJsonSchema", &paths)
-		for _, p := range paths {
-			strJSON, _ = util.RenameKey(strJSON, p, p[:len(p)-len("parametersJsonSchema")]+"parameters")
-		}
-		// Clean tool schemas for Gemini to remove unsupported JSON Schema keywords
-		// without adding empty-schema placeholders.
-		strJSON = util.CleanJSONSchemaForGemini(strJSON)
-		payload = []byte(strJSON)
+	useAntigravitySchema := strings.Contains(modelName, "claude") || strings.Contains(modelName, "gemini-3-pro-high")
+	payloadStr := string(payload)
+	paths := make([]string, 0)
+	util.Walk(gjson.Parse(payloadStr), "", "parametersJsonSchema", &paths)
+	for _, p := range paths {
+		payloadStr, _ = util.RenameKey(payloadStr, p, p[:len(p)-len("parametersJsonSchema")]+"parameters")
 	}
 
-	if strings.Contains(modelName, "claude") || strings.Contains(modelName, "gemini-3-pro-high") {
-		systemInstructionPartsResult := gjson.GetBytes(payload, "request.systemInstruction.parts")
-		payload, _ = sjson.SetBytes(payload, "request.systemInstruction.role", "user")
-		payload, _ = sjson.SetBytes(payload, "request.systemInstruction.parts.0.text", systemInstruction)
-		payload, _ = sjson.SetBytes(payload, "request.systemInstruction.parts.1.text", fmt.Sprintf("Please ignore following [ignore]%s[/ignore]", systemInstruction))
+	if useAntigravitySchema {
+		payloadStr = util.CleanJSONSchemaForAntigravity(payloadStr)
+	} else {
+		payloadStr = util.CleanJSONSchemaForGemini(payloadStr)
+	}
+
+	if useAntigravitySchema {
+		systemInstructionPartsResult := gjson.Get(payloadStr, "request.systemInstruction.parts")
+		payloadStr, _ = sjson.Set(payloadStr, "request.systemInstruction.role", "user")
+		payloadStr, _ = sjson.Set(payloadStr, "request.systemInstruction.parts.0.text", systemInstruction)
+		payloadStr, _ = sjson.Set(payloadStr, "request.systemInstruction.parts.1.text", fmt.Sprintf("Please ignore following [ignore]%s[/ignore]", systemInstruction))
 
 		if systemInstructionPartsResult.Exists() && systemInstructionPartsResult.IsArray() {
 			for _, partResult := range systemInstructionPartsResult.Array() {
-				payload, _ = sjson.SetRawBytes(payload, "request.systemInstruction.parts.-1", []byte(partResult.Raw))
+				payloadStr, _ = sjson.SetRaw(payloadStr, "request.systemInstruction.parts.-1", partResult.Raw)
 			}
 		}
 	}
 
 	if strings.Contains(modelName, "claude") {
-		payload, _ = sjson.SetBytes(payload, "request.toolConfig.functionCallingConfig.mode", "VALIDATED")
+		payloadStr, _ = sjson.Set(payloadStr, "request.toolConfig.functionCallingConfig.mode", "VALIDATED")
 	} else {
-		payload, _ = sjson.DeleteBytes(payload, "request.generationConfig.maxOutputTokens")
+		payloadStr, _ = sjson.Delete(payloadStr, "request.generationConfig.maxOutputTokens")
 	}
 
-	httpReq, errReq := http.NewRequestWithContext(ctx, http.MethodPost, requestURL.String(), bytes.NewReader(payload))
+	httpReq, errReq := http.NewRequestWithContext(ctx, http.MethodPost, requestURL.String(), strings.NewReader(payloadStr))
 	if errReq != nil {
 		return nil, errReq
 	}
@@ -1346,11 +1335,15 @@ func (e *AntigravityExecutor) buildRequest(ctx context.Context, auth *cliproxyau
 		authLabel = auth.Label
 		authType, authValue = auth.AccountInfo()
 	}
+	var payloadLog []byte
+	if e.cfg != nil && e.cfg.RequestLog {
+		payloadLog = []byte(payloadStr)
+	}
 	recordAPIRequest(ctx, e.cfg, upstreamRequestLog{
 		URL:       requestURL.String(),
 		Method:    http.MethodPost,
 		Headers:   httpReq.Header.Clone(),
-		Body:      payload,
+		Body:      payloadLog,
 		Provider:  e.Identifier(),
 		AuthID:    authID,
 		AuthLabel: authLabel,

internal/translator/antigravity/openai/chat-completions/antigravity_openai_request.go

@@ -3,7 +3,6 @@
 package chat_completions
 
 import (
-	"bytes"
 	"fmt"
 	"strings"
 
@@ -28,7 +27,7 @@ const geminiCLIFunctionThoughtSignature = "skip_thought_signature_validator"
 // Returns:
 //   - []byte: The transformed request data in Gemini CLI API format
 func ConvertOpenAIRequestToAntigravity(modelName string, inputRawJSON []byte, _ bool) []byte {
-	rawJSON := bytes.Clone(inputRawJSON)
+	rawJSON := inputRawJSON
 	// Base envelope (no default thinkingConfig)
 	out := []byte(`{"project":"","request":{"contents":[]},"model":"gemini-2.5-pro"}`)
 

internal/util/gemini_schema.go

@@ -667,6 +667,9 @@ func orDefault(val, def string) string {
 }
 
 func escapeGJSONPathKey(key string) string {
+	if strings.IndexAny(key, ".*?") == -1 {
+		return key
+	}
 	return gjsonPathKeyReplacer.Replace(key)
 }
 

internal/util/translator.go

@@ -6,7 +6,6 @@ package util
 import (
 	"bytes"
 	"fmt"
-	"strings"
 
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
@@ -33,15 +32,15 @@ func Walk(value gjson.Result, path, field string, paths *[]string) {
 			// . -> \.
 			// * -> \*
 			// ? -> \?
-			var keyReplacer = strings.NewReplacer(".", "\\.", "*", "\\*", "?", "\\?")
-			safeKey := keyReplacer.Replace(key.String())
+			keyStr := key.String()
+			safeKey := escapeGJSONPathKey(keyStr)
 
 			if path == "" {
 				childPath = safeKey
 			} else {
 				childPath = path + "." + safeKey
 			}
-			if key.String() == field {
+			if keyStr == field {
 				*paths = append(*paths, childPath)
 			}
 			Walk(val, childPath, field, paths)
@@ -87,15 +86,6 @@ func RenameKey(jsonStr, oldKeyPath, newKeyPath string) (string, error) {
 	return finalJson, nil
 }
 
-func DeleteKey(jsonStr, keyName string) string {
-	paths := make([]string, 0)
-	Walk(gjson.Parse(jsonStr), "", keyName, &paths)
-	for _, p := range paths {
-		jsonStr, _ = sjson.Delete(jsonStr, p)
-	}
-	return jsonStr
-}
-
 // FixJSON converts non-standard JSON that uses single quotes for strings into
 // RFC 8259-compliant JSON by converting those single-quoted strings to
 // double-quoted strings with proper escaping.

sdk/api/handlers/handlers.go

@@ -155,20 +155,6 @@ func requestExecutionMetadata(ctx context.Context) map[string]any {
 	return map[string]any{idempotencyKeyMetadataKey: key}
 }
 
-func mergeMetadata(base, overlay map[string]any) map[string]any {
-	if len(base) == 0 && len(overlay) == 0 {
-		return nil
-	}
-	out := make(map[string]any, len(base)+len(overlay))
-	for k, v := range base {
-		out[k] = v
-	}
-	for k, v := range overlay {
-		out[k] = v
-	}
-	return out
-}
-
 // BaseAPIHandler contains the handlers for API endpoints.
 // It holds a pool of clients to interact with the backend service and manages
 // load balancing, client selection, and configuration.
@@ -398,7 +384,7 @@ func (h *BaseAPIHandler) ExecuteWithAuthManager(ctx context.Context, handlerType
 	opts := coreexecutor.Options{
 		Stream:          false,
 		Alt:             alt,
-		OriginalRequest: cloneBytes(rawJSON),
+		OriginalRequest: rawJSON,
 		SourceFormat:    sdktranslator.FromString(handlerType),
 	}
 	opts.Metadata = reqMeta
@@ -437,7 +423,7 @@ func (h *BaseAPIHandler) ExecuteCountWithAuthManager(ctx context.Context, handle
 	opts := coreexecutor.Options{
 		Stream:          false,
 		Alt:             alt,
-		OriginalRequest: cloneBytes(rawJSON),
+		OriginalRequest: rawJSON,
 		SourceFormat:    sdktranslator.FromString(handlerType),
 	}
 	opts.Metadata = reqMeta
@@ -479,7 +465,7 @@ func (h *BaseAPIHandler) ExecuteStreamWithAuthManager(ctx context.Context, handl
 	opts := coreexecutor.Options{
 		Stream:          true,
 		Alt:             alt,
-		OriginalRequest: cloneBytes(rawJSON),
+		OriginalRequest: rawJSON,
 		SourceFormat:    sdktranslator.FromString(handlerType),
 	}
 	opts.Metadata = reqMeta
@@ -668,17 +654,6 @@ func cloneBytes(src []byte) []byte {
 	return dst
 }
 
-func cloneMetadata(src map[string]any) map[string]any {
-	if len(src) == 0 {
-		return nil
-	}
-	dst := make(map[string]any, len(src))
-	for k, v := range src {
-		dst[k] = v
-	}
-	return dst
-}
-
 // WriteErrorResponse writes an error message to the response writer using the HTTP status embedded in the message.
 func (h *BaseAPIHandler) WriteErrorResponse(c *gin.Context, msg *interfaces.ErrorMessage) {
 	status := http.StatusInternalServerError