fix: set the remaining extra fields for inputsShema

internal/extproc/translator/openai_gcpanthropic.go

@@ -34,6 +34,14 @@ const (
 	tempNotSupportedError = "temperature %.2f is not supported by Anthropic (must be between 0.0 and 1.0)"
 )
 
+// anthropicInputSchemaKeysToSkip defines the keys from an OpenAI function parameter map
+// that are handled explicitly and should not go into the ExtraFields map.
+var anthropicInputSchemaKeysToSkip = map[string]struct{}{
+	"required":   {},
+	"type":       {},
+	"properties": {},
+}
+
 // NewChatCompletionOpenAIToGCPAnthropicTranslator implements [Factory] for OpenAI to GCP Anthropic translation.
 // This translator converts OpenAI ChatCompletion API requests to GCP Anthropic API format.
 func NewChatCompletionOpenAIToGCPAnthropicTranslator(apiVersion string, modelNameOverride internalapi.ModelNameOverride) OpenAIChatCompletionTranslator {
@@ -163,16 +171,6 @@ func translateOpenAItoAnthropicTools(openAITools []openai.Tool, openAIToolChoice
 
 				inputSchema := anthropic.ToolInputSchemaParam{}
 
-				// Dereference json schema
-				// If the paramsMap contains $refs we need to dereference them
-				var dereferencedParamsMap any
-				if dereferencedParamsMap, err = jsonSchemaDereference(paramsMap); err != nil {
-					return nil, anthropic.ToolChoiceUnionParam{}, fmt.Errorf("failed to dereference tool parameters: %w", err)
-				}
-				if paramsMap, ok = dereferencedParamsMap.(map[string]any); !ok {
-					return nil, anthropic.ToolChoiceUnionParam{}, fmt.Errorf("failed to cast dereferenced tool parameters to map[string]interface{}")
-				}
-
 				var typeVal string
 				if typeVal, ok = paramsMap["type"].(string); ok {
 					inputSchema.Type = constant.Object(typeVal)
@@ -194,6 +192,21 @@ func translateOpenAItoAnthropicTools(openAITools []openai.Tool, openAIToolChoice
 					inputSchema.Required = requiredSlice
 				}
 
+				// ExtraFieldsMap to construct
+				ExtraFieldsMap := make(map[string]any)
+
+				// Iterate over the original map from openai
+				for key, value := range paramsMap {
+					// Check if the current key should be skipped
+					if _, found := anthropicInputSchemaKeysToSkip[key]; found {
+						continue
+					}
+
+					// If not skipped, add the key-value pair to extra field map
+					ExtraFieldsMap[key] = value
+				}
+				inputSchema.ExtraFields = ExtraFieldsMap
+
 				toolParam.InputSchema = inputSchema
 			}