diff --git a/internal/translator/antigravity/openai/chat-completions/antigravity_openai_request.go b/internal/translator/antigravity/openai/chat-completions/antigravity_openai_request.go
index 39fcbf50..d1914ec8 100644
--- a/internal/translator/antigravity/openai/chat-completions/antigravity_openai_request.go
+++ b/internal/translator/antigravity/openai/chat-completions/antigravity_openai_request.go
@@ -263,7 +263,7 @@ func ConvertOpenAIRequestToAntigravity(modelName string, inputRawJSON []byte, _
 						out, _ = sjson.SetRawBytes(out, "request.contents.-1", node)
 
 						// Append a single tool content combining name + response per function
-						toolNode := []byte(`{"role":"tool","parts":[]}`)
+						toolNode := []byte(`{"role":"user","parts":[]}`)
 						pp := 0
 						for _, fid := range fIDs {
 							if name, ok := tcID2Name[fid]; ok {