[__]

Tested and works.

pawn Код:

#include <a_samp>
#include <zcmd>
#include <YSI/y_scripting>

main() {
}

public OnGameModeInit() {
    printf("Commands: %d", countCommands());
    return 1;
}

CMD:test(playerid, params[]) {
    print("lol");
}

stock countCommands() {
    new
        cmdBuffer[32],
        commandCount;

    for(new it = 0; it < Scripting_GetPublicsCount(); it++) {
        Scripting_GetPublic(it, cmdBuffer);

        if(!strcmp(cmdBuffer, "cmd_", false, 4)) {
            commandCount++;
        }
    }

    return commandCount;
}

You need YSI/y_scripting for this to work, you can remove the OnGameModeInit callback as it was a test to verify it compiled.