Function select_stall_recovery_function

server/src/server/http_server.cpp:419–446

    // OpenAI-style additive penalties.
    sampler.freq_pen = body.value("frequency_penalty", 0.0f);
    sampler.pres_pen = body.value(
        "presence_penalty",
        defaults.has_presence_penalty ? defaults.presence_penalty : 0.0f);
    // HuggingFace-style multiplicative repetition penalty (also used by
    // vLLM, llama.cpp, etc.). Accepts both "repetition_penalty" and the
    // shorter "rep_pen" for daemon compatibility.
    sampler.rep_pen = body.value(
        "repetition_penalty",
        body.value("rep_pen",
                   defaults.has_repetition_penalty
                       ? defaults.repetition_penalty
                       : 1.0f));
    if (body.contains("rep_window")) {
        sampler.rep_window = body["rep_window"].get<int>();
    }
    return sampler;
}

json require_messages_array(const json & body) {
    if (!body.contains("messages") || !body["messages"].is_array() ||
        body["messages"].empty()) {
        throw std::invalid_argument("messages must be a non-empty array");
    }
    return body["messages"];
}

static bool env_flag_enabled(const char * name) {
    const char * raw = std::getenv(name);
    if (!raw || !*raw) return false;
    std::string value(raw);