static common_chat_params common_chat_templates_apply_jinja(
    const struct common_chat_templates        * tmpls,
    const struct common_chat_templates_inputs & inputs)
{
    // ...

    // DeepSeek V3.1: detect based on specific patterns in the template
    if (src.find("message['prefix'] is defined and message['prefix'] and thinking") != std::string::npos &&
        params.json_schema.is_null()) {
        return common_chat_params_init_deepseek_v3_1(tmpl, params);
    }

    // DeepSeek R1: use handler in all cases except json schema (thinking / tools).
    if (src.find("<｜tool▁calls▁begin｜>") != std::string::npos && params.json_schema.is_null()) {
        return common_chat_params_init_deepseek_r1(tmpl, params);
    }

    // Command R7B: : use handler in all cases except json schema (thinking / tools).
    if (src.find("<|END_THINKING|><|START_ACTION|>") != std::string::npos && params.json_schema.is_null()) {
        return common_chat_params_init_command_r7b(tmpl, params);
    }

    // ... 
}

static common_chat_params common_chat_params_init_deepseek_v3_1(const common_chat_template & tmpl, const struct templates_params & inputs) {
    // ...
}

static void common_chat_parse_deepseek_v3_1(common_chat_msg_parser & builder) {
    // ...
}

static const auto _ = common_chat_format_register([](auto & handler) {
    handler.format = COMMON_CHAT_FORMAT_DEEPSEEK_V3_1;
    handler.priority = 50;

    // Define markers for efficient search by an Aho-Corasick Automaton
    handler.markers = {
        "message['prefix'] is defined and message['prefix'] and thinking",
    };

    handler.detect = [](const std::string & src, const templates_params & params) {
        // Any additional detection logic not covered by `markers`. This should only run if all defined markers are found.
        return params.json_schema.is_null();
    };

    handler.init = [](const common_chat_template & tmpl, const templates_params & inputs) {
        // ... deepseek v3.1 init ...
        return data;
    };

    handler.parse = [](const std::string & input, bool is_partial, const common_chat_syntax & syntax) {
        return parse_with_builder([](common_chat_msg_parser & builder) {
            // ... common_chat_parse_deepseek_v3_1  implementation moves here ...
        });
    };
});