Fixed: #606

fix: unify response field naming across translators

Standardize `text` to `delta` and add missing `output` field in all response payloads for consistency across OpenAI, Claude, and Gemini translators.

Author: luispater

internal/translator/claude/openai/responses/claude_openai-responses_response.go

@@ -95,7 +95,7 @@ func ConvertClaudeResponseToOpenAIResponses(ctx context.Context, modelName strin
 				}
 			}
 			// response.created
-			created := `{"type":"response.created","sequence_number":0,"response":{"id":"","object":"response","created_at":0,"status":"in_progress","background":false,"error":null,"instructions":""}}`
+			created := `{"type":"response.created","sequence_number":0,"response":{"id":"","object":"response","created_at":0,"status":"in_progress","background":false,"error":null,"output":[]}}`
 			created, _ = sjson.Set(created, "sequence_number", nextSeq())
 			created, _ = sjson.Set(created, "response.id", st.ResponseID)
 			created, _ = sjson.Set(created, "response.created_at", st.CreatedAt)
@@ -197,11 +197,11 @@ func ConvertClaudeResponseToOpenAIResponses(ctx context.Context, modelName strin
 			if st.ReasoningActive {
 				if t := d.Get("thinking"); t.Exists() {
 					st.ReasoningBuf.WriteString(t.String())
-					msg := `{"type":"response.reasoning_summary_text.delta","sequence_number":0,"item_id":"","output_index":0,"summary_index":0,"text":""}`
+					msg := `{"type":"response.reasoning_summary_text.delta","sequence_number":0,"item_id":"","output_index":0,"summary_index":0,"delta":""}`
 					msg, _ = sjson.Set(msg, "sequence_number", nextSeq())
 					msg, _ = sjson.Set(msg, "item_id", st.ReasoningItemID)
 					msg, _ = sjson.Set(msg, "output_index", st.ReasoningIndex)
-					msg, _ = sjson.Set(msg, "text", t.String())
+					msg, _ = sjson.Set(msg, "delta", t.String())
 					out = append(out, emitEvent("response.reasoning_summary_text.delta", msg))
 				}
 			}

internal/translator/gemini/openai/responses/gemini_openai-responses_response.go

@@ -117,7 +117,7 @@ func ConvertGeminiResponseToOpenAIResponses(_ context.Context, modelName string,
 			st.CreatedAt = time.Now().Unix()
 		}
 
-		created := `{"type":"response.created","sequence_number":0,"response":{"id":"","object":"response","created_at":0,"status":"in_progress","background":false,"error":null}}`
+		created := `{"type":"response.created","sequence_number":0,"response":{"id":"","object":"response","created_at":0,"status":"in_progress","background":false,"error":null,"output":[]}}`
 		created, _ = sjson.Set(created, "sequence_number", nextSeq())
 		created, _ = sjson.Set(created, "response.id", st.ResponseID)
 		created, _ = sjson.Set(created, "response.created_at", st.CreatedAt)
@@ -160,11 +160,11 @@ func ConvertGeminiResponseToOpenAIResponses(_ context.Context, modelName string,
 				}
 				if t := part.Get("text"); t.Exists() && t.String() != "" {
 					st.ReasoningBuf.WriteString(t.String())
-					msg := `{"type":"response.reasoning_summary_text.delta","sequence_number":0,"item_id":"","output_index":0,"summary_index":0,"text":""}`
+					msg := `{"type":"response.reasoning_summary_text.delta","sequence_number":0,"item_id":"","output_index":0,"summary_index":0,"delta":""}`
 					msg, _ = sjson.Set(msg, "sequence_number", nextSeq())
 					msg, _ = sjson.Set(msg, "item_id", st.ReasoningItemID)
 					msg, _ = sjson.Set(msg, "output_index", st.ReasoningIndex)
-					msg, _ = sjson.Set(msg, "text", t.String())
+					msg, _ = sjson.Set(msg, "delta", t.String())
 					out = append(out, emitEvent("response.reasoning_summary_text.delta", msg))
 				}
 				return true

internal/translator/openai/openai/responses/openai_openai-responses_response.go

@@ -143,7 +143,7 @@ func ConvertOpenAIChatCompletionsResponseToOpenAIResponses(ctx context.Context,
 		st.ReasoningTokens = 0
 		st.UsageSeen = false
 		// response.created
-		created := `{"type":"response.created","sequence_number":0,"response":{"id":"","object":"response","created_at":0,"status":"in_progress","background":false,"error":null}}`
+		created := `{"type":"response.created","sequence_number":0,"response":{"id":"","object":"response","created_at":0,"status":"in_progress","background":false,"error":null,"output":[]}}`
 		created, _ = sjson.Set(created, "sequence_number", nextSeq())
 		created, _ = sjson.Set(created, "response.id", st.ResponseID)
 		created, _ = sjson.Set(created, "response.created_at", st.Created)
@@ -216,11 +216,11 @@ func ConvertOpenAIChatCompletionsResponseToOpenAIResponses(ctx context.Context,
 					}
 					// Append incremental text to reasoning buffer
 					st.ReasoningBuf.WriteString(rc.String())
-					msg := `{"type":"response.reasoning_summary_text.delta","sequence_number":0,"item_id":"","output_index":0,"summary_index":0,"text":""}`
+					msg := `{"type":"response.reasoning_summary_text.delta","sequence_number":0,"item_id":"","output_index":0,"summary_index":0,"delta":""}`
 					msg, _ = sjson.Set(msg, "sequence_number", nextSeq())
 					msg, _ = sjson.Set(msg, "item_id", st.ReasoningID)
 					msg, _ = sjson.Set(msg, "output_index", st.ReasoningIndex)
-					msg, _ = sjson.Set(msg, "text", rc.String())
+					msg, _ = sjson.Set(msg, "delta", rc.String())
 					out = append(out, emitRespEvent("response.reasoning_summary_text.delta", msg))
 				}