diff --git a/src/testium/interpreter/utils/bins.py b/src/testium/interpreter/utils/bins.py
index b08fd1c..796bf77 100644
--- a/src/testium/interpreter/utils/bins.py
+++ b/src/testium/interpreter/utils/bins.py
@@ -396,9 +396,7 @@ def ensure(*names):
                 f"Set '{gd_key}' in the YAML config to override."
             )
         elif not tm.gd(gd_key):
-            # Publish the resolved interpreter so test scripts can reference
-            # $(python_bin) / $(lua_bin) regardless of how testium was launched
-            # (e.g. GUI, where no -d override is passed).
+            # Publish resolved path so test scripts can use $(python_bin)/$(lua_bin).
             tm.setgd(gd_key, path)
     if missing:
         raise ETUMRuntimeError(
diff --git a/src/testium/interpreter/utils/lua_process.py b/src/testium/interpreter/utils/lua_process.py
index 7a30052..59185f0 100644
--- a/src/testium/interpreter/utils/lua_process.py
+++ b/src/testium/interpreter/utils/lua_process.py
@@ -116,15 +116,13 @@ class LuaProcessBase:
             restore_signals=False,
             **popen_kwargs,
         )
-        # Route subprocess stdout/stderr into the parent's log and read the
-        # startup port sentinel before connecting.
+        # Forward subprocess output to the log and read the startup port sentinel.
         holder = drain_and_read_port(self._process, prefix="[lua_func] ")
         self._port = wait_for_port(
             self._process, holder, tm.gd("proc_start_timeout", 30)
         )
         if self._port is None:
-            # Worker died before announcing its port: tear down fully so a
-            # later start() (e.g. a reused context_id engine) can retry cleanly.
+            # Worker died before announcing its port: reset so a later start() retries clean.
             self.stop()
             self.join()
             return
diff --git a/src/testium/interpreter/utils/proc_drain.py b/src/testium/interpreter/utils/proc_drain.py
index d6d039a..c00c4c4 100644
--- a/src/testium/interpreter/utils/proc_drain.py
+++ b/src/testium/interpreter/utils/proc_drain.py
@@ -77,8 +77,7 @@ def drain_and_read_port(process, prefix=""):
                 pipe.close()
             except Exception:
                 pass
-            # Unblock the waiter on EOF even if the sentinel never came.
-            holder["evt"].set()
+            holder["evt"].set()  # unblock waiter on EOF even without sentinel
 
     if process.stdout is not None:
         threading.Thread(
@@ -104,7 +103,6 @@ def wait_for_port(process, holder, deadline):
         if holder["port"] is not None:
             break
         if process.poll() is not None:
-            # Child exited; give the reader a moment to flush a trailing line.
-            holder["evt"].wait(0.2)
+            holder["evt"].wait(0.2)  # child exited; let the reader flush a trailing line
             break
     return holder["port"]
diff --git a/src/testium/interpreter/utils/py_process.py b/src/testium/interpreter/utils/py_process.py
index 2248bd3..2991f10 100644
--- a/src/testium/interpreter/utils/py_process.py
+++ b/src/testium/interpreter/utils/py_process.py
@@ -99,17 +99,13 @@ class PyProcessBase:
             restore_signals=False,
             **popen_kwargs,
         )
-        # Route subprocess stdout/stderr into the parent's log and read the
-        # startup port sentinel. Startup variance (cold start, antivirus) is
-        # absorbed here: we wait for the worker to announce its port before
-        # connecting.
+        # Forward subprocess output to the log and read the startup port sentinel.
         holder = drain_and_read_port(self._process, prefix="[py_func] ")
         self._port = wait_for_port(
             self._process, holder, tm.gd("proc_start_timeout", 30)
         )
         if self._port is None:
-            # Worker died before announcing its port: tear down fully so a
-            # later start() (e.g. a reused context_id engine) can retry cleanly.
+            # Worker died before announcing its port: reset so a later start() retries clean.
             self.stop()
             self.join()
             return
diff --git a/src/testium/py_func/__init__.py b/src/testium/py_func/__init__.py
index 919d190..3e2b1be 100755
--- a/src/testium/py_func/__init__.py
+++ b/src/testium/py_func/__init__.py
@@ -39,8 +39,7 @@ def main():
         thrd_api.dbg_out = stdio_redir.ini_stdout
     thrd_api.start()
 
-    # Announce the actual bound port on real stdout (before redirection) so the
-    # parent connects only once we are listening.
+    # Announce the bound port on real stdout (before redirection) so the parent connects.
     port = thrd_api.wait_bound(args.timeout)
     if port is None:
         print("py_func: failed to bind a listening port", file=sys.stderr, flush=True)
diff --git a/src/testium/runtime/jrpc.py b/src/testium/runtime/jrpc.py
index c9b8edf..5acab31 100644
--- a/src/testium/runtime/jrpc.py
+++ b/src/testium/runtime/jrpc.py
@@ -12,9 +12,7 @@ except:
 
 from runtime.tum_except import ETUMRuntimeError
 
-# Startup handshake: the subprocess prints this line (followed by the actual
-# bound port) on stdout once its server is listening; the parent reads it and
-# connects. Avoids guessing the port and connecting before the server is ready.
+# Startup handshake: subprocess prints this + its bound port on stdout once listening.
 RPC_PORT_SENTINEL = "__TESTIUM_RPC_PORT__="
 
 """Lightweight JSON-RPC 2.0 helpers over TCP sockets.
@@ -284,8 +282,7 @@ class JsonRpcBase(threading.Thread):
         self._req_handler = req_handler
         self._dbg_out = dbg_out
         self._event_ready = threading.Event()
-        # Event is set on success AND failure so wait_ready() never hangs;
-        # _connected carries the actual outcome.
+        # Set on success AND failure so wait_ready() never hangs; outcome in _connected.
         self._connected = False
 
     def handle_request(self, method, params):
@@ -374,11 +371,7 @@ class JsonRpcSrv(JsonRpcBase):
         try:
             with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
 
-                # No SO_REUSEADDR: the OS picks a fresh ephemeral port (port 0),
-                # so there is no TIME_WAIT to override, and on Windows REUSEADDR
-                # would let another process hijack the port.
-
-                # Bind (port may be 0 -> OS-assigned) then publish the actual port
+                # No SO_REUSEADDR: fresh ephemeral port; on Windows it enables hijacking.
                 sock.bind((self._host, self._port))
 
                 # Listens incoming connections
@@ -406,8 +399,7 @@ class JsonRpcSrv(JsonRpcBase):
                         sleep(0.1)
 
         finally:
-            # Unblock wait_bound() even if bind/accept failed.
-            self._bound_evt.set()
+            self._bound_evt.set()  # unblock wait_bound() even on failure
             if self._rpc is not None:
                 self._rpc.stop()
                 self._rpc.join()
@@ -441,13 +433,10 @@ class JsonRpcClient(JsonRpcBase):
         except Exception as e:
             self.print_info(f"connection failed: {e}")
         finally:
-            # Settle wait_ready() whatever the outcome (_connected stays False
-            # on failure).
-            self._event_ready.set()
+            self._event_ready.set()  # settle wait_ready() whatever the outcome
 
     def run_win(self):
-        # Server is already listening (port handshake), so connect succeeds on
-        # the first attempt; retry on refused/timeout until the deadline anyway.
+        # Server already listening (handshake); retry on refused/timeout until deadline.
         deadline = monotonic() + self._timeout
         sock = None
         try: