WARNING: The following contains spoilers for Boruto: Naruto Next Generations Episode 177, "The Iron Wall's Sensing System," now streaming on Crunchyroll.
Naruto is living his worst nightmare as he's realized spies have been infiltrating Konoha and taking key intel back to Kara. It's the price he's paying as Hokage for free movement between villages, which his council now deems a bit lax as it's allowed outsiders to infiltrate after Naruto thought an era of peace had been ushered in by the alliance. The latest episode provides a key connection to the manga in showing the origin of Konoha's major defense weapon, which will be used against Jigen and his terrorists later on to stop a crucial kidnapping.
Naruto doesn't want to close borders as he feels it'd be letting the enemy win, thus he's commissioned an upgraded sensory perception project at their main gate. Ino's leading the initiative as part of the Yamanaka clan, which is noted for her dad Inoichi who led the crew that died in the war against Kaguya. They protected Naruto's army, as well as other villages, but sacrificed themselves in the process, and now Ino's carrying on that legacy.
She's using scientific tools to evolve the job, though, rather than using ninjas, chakra and their sensory jutsu, as this taxes them drastically. It drains physically and hurts mentally, and relying on humans too much could lead to errors. Thus, Ino thinks tech will perfectly supplement them, which helps her team create an automatic chakra barrier. The shinobi unit's now slated to monitor like a surveillance system, thus crafting a home security setup where once invaders cross over, they'll be detected so the border patrol can then be directed to them for arrest.
Ino's quite proud as it shows how the modern era improves on the old one, which Sasuke already explained to Boruto is the way forward. Now, that doesn't mean the system can do without human eyes, because as Ino says, it's just like operators behind machines and computers. Judgment calls must be made at people's discretion, so they will need sensory ninjas like her to monitor on a constant basis, which allows for a shift system as they try to bring in younger ninjas like her son, Inojin.
Interestingly, this barrier was in effect in the manga when Koji Kashin had to sneak in to investigate Naruto and Boruto taking Kawaki in. He wanted the vessel back for Jigen, which led to Delta making an intrusion too. In her case, she was foreign so she was detected, while Koji had a secret tied to an old Konoha ninja to exploit as he snuck in secretly. This episode shows the foundation for these flaws, with a thief copying a chakra signature and pretending to be from Konoha. Thus, a lot of work is still needed, but it's something Konoha desperately needs.
