Compact screenshot context every 4 steps by default

src/cli.py

@@ -34,6 +34,12 @@ def build_parser() -> argparse.ArgumentParser:
         default="medium",
         help="Reasoning effort passed to the model.",
     )
+    parser.add_argument(
+        "--screen-context-decay-steps",
+        type=int,
+        default=4,
+        help="Compact model context every N steps to decay old screenshots (0 disables).",
+    )
     parser.add_argument("--disable-tool", action="append", default=[], help="Disable a tool by name.")
     parser.add_argument("--skip-safety-check", action="store_true", help="Bypass pre-flight safety check.")
     parser.add_argument("--no-failsafe", action="store_true", help="Disable PyAutoGUI fail-safe.")
@@ -85,6 +91,7 @@ def main(argv: list[str] | None = None) -> int:
         type_interval=args.type_interval,
         click_pause=args.click_pause,
         reasoning_effort=args.reasoning_effort,
+        screen_context_decay_steps=max(0, int(args.screen_context_decay_steps)),
         disable_tools=set(disabled_tools),
     )
     try: