Three different omissions produce concrete erroneous STRIPS plans. Here a route means the corresponding successive actions with the indicated first argument.
No lethal-entry condition. Move the agent along , take the gold at , and reverse the route. This nine-action STRIPS plan satisfies every supplied precondition and the final goal test, without firing. Physically it fails on entering the live monster’s room: the supplied search transition model neither forbids the entry nor records death. The omitted pit cell happens to be disconnected in the supplied adjacency relation, so this particular instance already excludes pit entry; that accidental protection does not encode the monster hazard.
Supposedly stationary objects can move themselves. The five-action STRIPS planleaves the agent at the exit and brings it the gold. The formal preconditions hold because in has no actor restriction. Gold cannot actually propel itself. The same flaw permits moving the supposedly stationary monster.
Unrestricted pickup permits impossible inventory. Follow the first example’s outward route, but insert immediately after reaching . Continue to , take the gold and return. This ten-action STRIPS plan ends with both and and satisfies the supplied goal. Its entrance also exposes the first flaw, but the additional, distinct defect is that pickup treats the live monster as a collectible object and deletes its location. A movement safety check alone is not a specification of which objects are collectible. The shot schema likewise lacks restrictions to the designated shooter, projectile and victim; fixing the action roles together prevents these type errors.
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