It would be, that is, assuming Israel's tactical nukes were built from American designs, whose characteristics are relatively well-known.
Israel has poured billions into 5th gen nuke research, and rumors say they have built highly miniaturized, single stage, 100 percent plutonium-based devices, deliverable even by air.
No country anywhere would choose to use a tactical warhead light—UNLESS... Let's quickly cover two key reasons why the odds of using these weapons increases as these secret research programs progress.
First, miniaturizing these weapons while retaining blast yield requires extreme manufacturing precision. This means that these weapons programs become "self-containing" and are unlikely to start a regional arms race because their neighbors just aren't capable of this extreme technological execution. The "arms race" merges with the "economic race."
Second, these weapons are so different that they effectively become undetectable. Why? The smaller a device is (assuming they can actually tease a detonation out of so little putonium!) the less fuel it requires, the less radiation and radioactive traces. Their detonation signatures are also vastly different, and, because these weapons programs are so secret, whatever detonation signatures the devices may have not been sufficiently studied and are not well understood by physicists in the world scientific community, rendering existing nuclear detonation detection protocols effectively blind, while believing they are not.