Ninjers always say Ninjutsu was from Sunzi Bingfa.
I post full text of the chapter from Sunzi Bingfa, so please explain how Ninjas learn it and how it became Ninjutsu with reliable sources.
No mythology is allowed.
Stick with historical facts.
As you see the chapter 用間 is very short comparing to Bansenshukai.
There's nothing about the series of Shinobi tools.

孫子　用間篇

孫子曰、凡興師十萬、出征千里、百姓之費、公家之奉、日費千金、内外騷動、怠於道路、不得操事者、七十萬家、相守數年、以爭一日之勝、而愛爵祿百金、不知敵之情者、不仁之至也、非人之將也、非主之佐也、非勝之主也、故明君賢將、所以動而勝人、成功出於衆者、先知也、先知者不可取於鬼神、不可象於事、不可驗於度、必取於人、知敵之情者也、

故用間有五、有因間、有内間、有反間、有死間、有生間、五間倶起、莫知其道、是謂神紀、人君之寳也、因間者、因其郷人而用之、内間者、因其官人而用之、反間者、因其敵間而用之、死間者、爲誑事於外、令吾間知之、而傳於敵間也、生間者、反報也、

故三軍之事、莫親於間、賞莫厚於間、事莫密於間、非聖智不能用間、非仁義不能使間、非微妙不能得間之實、微哉微哉、無所不用間也、間事未發而先聞者、間與所告者皆死、

凡軍之所欲撃、城之所欲攻、人之所欲殺、必先知其守將左右謁者門者舍人之姓名、令吾間必索知之、

必索敵人之間來間我者、因而利之、導而舍之、故反間可得而用也、因是而知之、故郷間内間可得而使也、因是而知之、故死間爲誑事、可使告敵、因是而知之、故生間可使如期、五間之事、主必知之、知之必在於反間、故反間不可不厚也、

昔殷之興也、伊摯在夏、周之興也、呂牙在殷、故惟明君賢將、能以上智爲間者、必成大功、此兵之要、三軍之所恃而動也、

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