Does one have the right to claim full entitlements under Egyptian labor law, despite the absence of formal contracts, based on an explicit promise to sign them?

If workers perform their duties in a company after an agreement has been reached, their rights are legally established, even if the contract has not been formally documented, so long as offer and acceptance have occurred. Labor law is considered a binding custom for both parties, unless the specific contract stipulates otherwise and they mutually agree upon it. The principle "What is known by custom is like what is stipulated by condition" applies here.