Elisp is a lisp-2 with user-defined macros. A simple parser cannot detect if e.g. (foo (let ...)) is a function call with a let expression argument, or a macro call where let means something else.
What Is it Meant to Do? The Lisply-MCP middleware connects MCP-capable AI Agent programs, or MCP Clients, such as ClaudeDesktop, to Lisp-based systems which support a REPL, or Read-Eval-Print Loop.