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12 changes: 7 additions & 5 deletions include/minja/chat-template.hpp
Original file line number Diff line number Diff line change
Expand Up @@ -395,8 +395,8 @@ class chat_template {

for (const auto & message_ : adjusted_messages) {
auto message = message_;
if (!message.contains("role") || !message.contains("content")) {
throw std::runtime_error("message must have 'role' and 'content' fields: " + message.dump());
if (!message.contains("role") || (!message.contains("content") && !message.contains("tool_calls"))) {
throw std::runtime_error("message must have 'role' and one of 'content' or 'tool_calls' fields: " + message.dump());
}
std::string role = message.at("role");

Expand All @@ -417,7 +417,6 @@ class chat_template {
}
}
if (polyfill_tool_calls) {
auto content = message.at("content");
auto tool_calls = json::array();
for (const auto & tool_call : message.at("tool_calls")) {
if (tool_call.at("type") != "function") {
Expand All @@ -436,8 +435,11 @@ class chat_template {
auto obj = json {
{"tool_calls", tool_calls},
};
if (!content.is_null() && !content.empty()) {
obj["content"] = content;
if (message.contains("content")) {
auto content = message.at("content");
if (!content.is_null() && !content.empty()) {
obj["content"] = content;
}
}
message["content"] = obj.dump(2);
message.erase("tool_calls");
Expand Down
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