Alfworld Object State Inspector

Instructions

Use this skill to inspect the state of a target object or receptacle in an AlfWorld household environment. The primary goal is to obtain the observation feedback from the environment about what is currently on or in the target.

When to Trigger

Trigger this skill immediately after navigating to a target receptacle (e.g., go to toiletpaperhanger 1) when you need to know:

• If the target is empty.
• What specific objects are present on/​in the target.
• The condition or state of the target (implied by the environment's observation).

Core Procedure

1. Navigate to Target: First, ensure the agent has executed a go to {target_receptacle} action. This skill assumes the agent is already at the target's location.
2. Observe Environment Feedback: The skill is complete once the environment provides an observation in response to the navigation. Do not perform an additional inspection action. The observation from the go to action contains the state information.
3. Parse Observation: Interpret the observation message (e.g., "On the toiletpaperhanger 1, you see nothing." or "On the toilet 1, you see a soapbottle 1, and a toiletpaper 1.").
4. Output Decision Data: Based on the observation, determine the next step in the broader task (e.g., "Target is empty, proceed to find item" or "Target contains required item, proceed to pick it up").

Input/​Output Format

• Input Context: The agent must be at the target location. The last action should be go to {target_receptacle}.
• Output: The observation string from the environment and a brief interpretation.
  • Example Output: Observation: On the toiletpaperhanger 1, you see nothing. | Interpretation: The holder is empty. A toiletpaper roll must be found elsewhere.

Error Handling

• If the observation is "Nothing happened," the previous go to action was likely invalid. Re-evaluate the target's name or location.
• This skill does not involve actions like open, close, or toggle. It relies solely on the observational feedback from navigation.

Key Principle: This skill encapsulates the waiting and parsing of the environment's state disclosure after navigation. It provides the critical information needed to decide the subsequent take, put, or further go to action.