explicitly mark SYSTEM МЕССЕДЖ AS СИСТЕМ

main.go

@@ -51,6 +51,7 @@ func (p *OpenAIPrompter) Prompt(ctx context.Context, req PromptRequest) (*Highly
 				Content: responses.EasyInputMessageContentUnionParam{
 					OfString: openai.String(sysPrompt),
 				},
+				Role: responses.EasyInputMessageRoleSystem,
 			},
 		},
 		{
@@ -64,7 +65,6 @@ func (p *OpenAIPrompter) Prompt(ctx context.Context, req PromptRequest) (*Highly
 	}
 
 	resp, err := p.cli.Responses.New(ctx, responses.ResponseNewParams{
-		Instructions: openai.String(p.cfg.SystemPrompt),
 		Input: responses.ResponseNewParamsInputUnion{
 			OfInputItemList: input,
 		},