Formal semantics of tactics Tactics are supposed to represent inference rules in a system, and it might seem unnecessary at first to formalize the semantics of tactics; nevertheless, modern theorem provers can have pretty complicated tactics which have complex semantics. 

My question is, thus, has there been any work on the formalization of tactics in interactive theorem proving, either for Coq-style or LCF/HOL-style theorem provers?
Obviously there is an operational semantics of Ltac by Jedynak et al.