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type t =
| Text of { text : string }
| Tool_call of {
tool_call_type : string;
tool_call_id : string;
tool_name : string;
args : string;
}
| Reasoning of {
text : string;
signature : string option;
provider_options : Provider_options.t;
}
| File of {
data : bytes;
media_type : string;
}
| Source of {
source_type : string;
id : string;
url : string;
title : string option;
provider_options : Provider_options.t;
}