ScriptScope

Implicit receiver for every execute_code snippet: a shadowing println / print writing into the per-eval sink returned with the result. Kotlin resolves implicit-receiver members ahead of default-imported kotlin.io functions, so bare println(...) is captured for every argument type — while fully-qualified kotlin.io.println / System.out.println bypass the shadow onto the JVM's real stdout, and out of this eval's result.

iterator rides the same rule against kotlin.sequences.iterator, handing the snippet a McpScope whose yield reports its value instead of discarding it. Fully qualifying kotlin.sequences.iterator still gets the stdlib builder, and the lane still drives it — silently, as before.

Two real println overloads, not one (Any? = null): a default can't distinguish println() from println(null).

Members stay functions and sink stays private: exposing Capture exposes take(), which seals the sink and silently drops the rest of the eval's output. Keeping them functions was also what worked around a frontend gap on the old REPL-snippet path, where a val here went invisible to any snippet declaring a class; unverified on the script path, so it has not been relaxed.