Houston has no city ordinances relating to weapons that are more strict than the state law. I have heard that San Antonio has an ordinance relating to blade length, but do not remember the length. Case law often defines issues that are not specifically addressed by the Penal Code. I am not aware of any case law mentioning blades with swedges, but the presence of two edges seems to be the criteria for an arrest being made for "carrying a prohibited weapon-dirk or dagger".... it is really up to the District Attorney, who must accept the charge, agreeing with the arresting officer that a given blade is illegal. I am not a lawyer, of course. I am a police officer, and can't give advice on weapons without violating department policy, so I will only say my employer starts with "H".... I suggest carrying knives which are clearly legal. If you carry a knife which pushes the limits, I would suggest obtaining legal advice first, maintaining a fund for legal expenses, being prepared to have the knive confiscated if it is discovered by LE. A kerambit may also be at risk of being defined as "knuckles" which are also prohibited weapons. One investigator told me he thought my Emerson LaGriffe would be illegal for that reason.