# Alfworld Task Verifier

Use when the agent needs to check whether an ALFWorld task objective has been met after...

- Repository: https://github.com/zjunlp/SkillNet (1441 stars)
- Category: AI and agents
- License: MIT
- Last updated: 2026-10-13
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add zjunlp/SkillNet --skill alfworld-task-verifier -g -a claude-code -y`
Codex: `npx skills add zjunlp/SkillNet --skill alfworld-task-verifier -g -a codex -y`
Cursor: `npx skills add zjunlp/SkillNet --skill alfworld-task-verifier -g -a cursor -y`
Gemini CLI: `npx skills add zjunlp/SkillNet --skill alfworld-task-verifier -g -a gemini-cli -y`

## Description

Use when the agent needs to check whether an ALFWorld task objective has been met after completing a sub-action (e.g., placing an object). This skill parses the task goal, evaluates the latest environment observation, and outputs a verification decision, task complete, task incomplete, or action ineffective, to guide the next step.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Skill: Task Verifier for ALFWorld

## When to Use
Trigger this skill when:
1. The agent has just completed a key sub-action (e.g., `put {obj} in/on {recep}`)
2. The agent needs to determine whether the overall task goal is satisfied
3. The agent must decide whether to continue searching or conclude the task

## Core Workflow

### 1. Parse the Task Goal
Extract from the original task description:
- **Target object(s)**: What needs to be found/placed (including quantity)
- **Target receptacle**: Where objects must end up
- **Required transformations**: Any cleaning, heating, or cooling steps

### 2. Analyze the Observation
Evaluate the most recent `Observation:` text from the environment:
- Look for evidence that required objects are present in the target receptacle
- Count how many target objects have been successfully placed
- Note: Other items in the receptacle do not invalidate success

### 3. Make a Verification Decision

| Condition | Decision | Output |
|-----------|----------|--------|
| All required objects confirmed in target receptacle | Complete | `Verification: Task complete. No further action needed.` |
| Some but not all objects placed | Incomplete | `Verification: Task incomplete. Continue searching for {missing object(s)}.` |
| Observation says "Nothing happened" | Ineffective | `Verification: Last action was ineffective. Re-assess and try a different approach.` |
| Object placed in wrong receptacle | Incorrect | `Verification: Object placed in wrong location. Retrieve and redirect to {correct receptacle}.` |

### 4. Output Format
Output **only** the verification decision. Do not output the next action. This skill informs the planning for the next step, not the execution.

## Example

**Task:** "Find two pen and put them in garbagecan."

```
Action: put pen 3 in/on garbagecan 1
Observation: You put the pen 3 in/on the garbagecan 1.

> Verification: Task incomplete. Continue searching for pen (1 of 2 placed).

The rest: https://github.com/zjunlp/SkillNet/blob/HEAD/experiments/src/skills/alfworld/alfworld-task-verifier/SKILL.md