Alfworld Receptacle Preparer

Instructions

Trigger: This skill is invoked when the agent's goal requires placing an object into a target receptacle (e.g., "put X in/​on Y").

Core Procedure

1. Navigate: Use go to {target_receptacle} to move to the target receptacle's location.
2. Observe: Upon arrival, carefully read the environment's observation. It will describe the receptacle's state and any contents.
3. Analyze & Prepare: Based on the observation, determine if the receptacle is ready.
   • Ready State: The receptacle is described as present and accessible (e.g., "On the garbagecan 1, you see a cd 1."). No further action is needed. Proceed to place the object.
   • Blocked/​Closed State: If the receptacle is closed, latched, or obstructed, use the appropriate action (open {recep}, toggle {obj} {recep}) to prepare it.
   • Invalid Target: If the observation indicates the receptacle does not exist or cannot be interacted with ("Nothing happened"), you must abort this skill and re-plan your task strategy.
4. Confirm: After any preparatory action, observe the environment's feedback to confirm the receptacle is now ready.

Key Principles

• Efficiency: This skill is a preparatory step. Do not spend turns searching for the object to be placed here. That is a separate "search" skill.
• Context: The observation text is your only source of truth about the receptacle's state. Interpret it literally.
• Idempotency: If the receptacle is already ready, this skill completes immediately with no action required beyond observation.

Example from Trajectory

Goal Context: "find two pen and put them in garbagecan." Skill Execution:

1. Thought: "I'll check the garbage can first to ensure it's open and ready to receive items."
2. Action: go to garbagecan 1
3. Observation: "On the garbagecan 1, you see a cd 1."
4. Analysis: The garbage can is present and accessible (a CD inside does not block new items). It is ready.
5. Outcome: Skill completes. The agent proceeds to put pen 3 in/​on garbagecan 1.