12:44 PM PT -- 3/4 -- According to the incident report -- obtained by TMZ -- both YFN and another inmate possessed sharp objects during a fight. Guards attempted to separate the men, using tasers, but they had little effect ... during the fight, Lucci allegedly yelled, "I feel like killing this n****!"
Lucci sustained a laceration to his head during the melee -- and received medical treatment -- unclear if it's the stabbing injury he mentioned in docs.
According to the report, the other man will be charged with aggravated assault and battery ... it does not appear that Lucci will be charged.
YFN Lucci is desperate to get out of jail as he awaits trial in his murder case ... because he thinks he might literally die behind bars if he stays locked up.
According to new legal docs, the rapper claims a fellow inmate at the Fulton County Jail stabbed him last month ... and he also says he's been told there's a bounty on his head among inmates.
In the docs, obtained by TMZ, YFN Lucci claims he was stabbed from behind while on a video call with someone on the outside ... and he says the other inmate used a homemade shank to stab him.
Since the alleged stabbing back on Feb. 9, YFN Lucci claims he's been told there's a price on his head ... and he fears his life is in jeopardy if he remains in custody.
As a result, YFN Lucci is asking the judge to grant him bond so he can get the hell outta jail ... and he says he would be down with 24-hour home confinement and wear a monitoring device if he gets out.