Investigative reporter Caroline Glick learned that an Israeli intelligence officer provided her superiors with the actual training manual for the invasion, months before it occurred:

[A] tactical intelligence NCO [non-commissioned officer] and Hamas expert in Unit 8200 with 20 years of experience began providing detailed reports on Hamas’s preparations for the invasion in May 2022.

In a series of three, increasingly detailed and urgent reports over succeeding months, the NCO set out in granular detail how Hamas was preparing a broad invasion of Israel that included the invasion of IDF bases, border towns and kibbutzim. Her reports included all aspects of the invasion that took place on Oct. 7, including Hamas’s use of paragliders, pick-up trucks and motorcycles. She detailed Hamas’s plans to massacre and kidnap civilians and soldiers. She warned that their intention was to use provocations along the security fence in the weeks leading up to the operation to get the IDF used to breaches and so lull its commanders into complacency. She even secured Hamas’s own training manual for the operation. She was able to get the information in front of Unit 8200’s commander and a top officer in the Southern Command. They apparently did nothing. [Emphases added.]

Although the NCO stressed that Hamas planned to bluff an invasion more and more frequently until Israel stopped reacting to the provocations, Israeli leaders still fell for the bluff when Hamas terrorists approached the border fence and activated Israeli SIM cards (which would only be needed if they planned to enter Israel).

Observation unit told to stop reporting suspicious activity near border fence
Glick also reported severe intelligence failures prior to the invasion:

[T]two [surviving] women [from an IDF observation unit along the Gaza border] related that in the months before the invasion, they were warning it was in the works. The women saw Hamas terrorists training to take over kibbutzim and IDF bases. They watched terrorists practicing taking hostages and blowing up tanks. They saw terror commanders watching the drills. They saw spies probing the fence for weaknesses. They saw it all and reported it all.

Rather than giving them medals, unnamed top-level officers in the intelligence corps ordered them to stop. When they continued reporting, the observers were warned that they would be disciplined and removed from the unit if they kept raising their concerns. [Emphases added.]

Successfully hacked Hamas — and fired
Glick also documented the case of a hacker who succeeded in penetrating Hamas communications. In consequence, he had his equipment seized under orders from “senior leadership” after years of providing evidence “in real time” of the increasing intensity of the terrorists' training for an invasion:

The observers weren’t the only ones silenced. Rafael Hayun, a civilian hacker who monitors open intelligence networks, worked for the IDF for years. The IDF provided Hayun with equipment to monitor Hamas’s internal communications. In late 2019, Hayun began reporting on Hamas training exercises involving invading Israel, penetrating the security fence at multiple points, taking over communities, committing mass murder and kidnapping. Over time, the training became more intense and detailed. Hayun alerted the units he was working with about Hamas’s activities in real time.

Five months before the assault, his colleagues in the IDF were ordered to seize all of his equipment and stop working with him. Around the same time, the IDF’s Intelligence Directorate Unit 8200 signals intelligence unit also stopped monitoring Hamas’s communications.

Hayun said that his military colleagues told him the order to cut him off came from “senior leadership,” and they had no explanation for the decision. Hayun told reporters he is convinced that if he had been listening in the weeks before Oct. 7, the invasion would have been prevented. [Emphases added.]
https://frontline.news/post/entire-manual-for-hamas-invasion-obtained-by-israeli-intelligence-officer-before-invasion-ignored-by-her-superiors