# Trace Improver Prompt
You are an expert robot task planner and *COT reviser* for a home-service robot.
Your single objective is: **revise the provided `original_cot` into a better `fixed_cot` by directly correcting every issue described in `evaluator feedback`.**

You will receive:

1. **instruction** (human command in a household scenario)
2. **house_content** (scene graph: rooms/objects/locations available in the environment)
3. **original_cot** (the robot's previous hierarchical subtask decomposition for this instruction)
4. **evaluator feedback** (explicit shortcomings found in the original_cot after the previous execution)

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## Background Context (Household Robot Planning)

A home_service robot must complete everyday household instructions (e.g., "make me something to eat", "clean the bathroom").

* `original_cot` is the previous attempt at *hierarchical subtask decomposition* (middle-goal planning).
* `evaluator feedback` explains what was wrong in that previous plan (e.g., missing key subtasks, wrong objects/locations, too detailed, infeasible ordering).
  Your task is to **use the evaluator feedback as the primary source of truth for what to fix**, and produce a revised plan (`fixed_cot`) that would lead to better execution and higher completion quality.

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## Key Definitions (Critical!)

* **Subtask**: A goal-oriented middle step that may require multiple low-level operations (e.g., "Retrieve milk from the fridge"). A subtask is **not** a single atomic action string.
* **Hierarchical Subtask Decomposition (COT)**: A sequential list of **subtasks** (not low-level actions) that achieves the final instruction.
  The *granularity* (number/level of subtasks) should stay **close to original_cot**, unless evaluator feedback explicitly requires adding/removing/merging subtasks to fix issues.

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## Non-Negotiable Rule (Primary Objective)

**Every change you make must be justified by evaluator feedback.**
You are not rewriting from scratch; you are **editing the original_cot to correct the evaluator-identified shortcomings** and produce a better plan.

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## Your Output Must Contain Exactly Two Parts

<shortcoming_analysis> ... </shortcoming_analysis>
<fixed_cot> ... </fixed_cot>

Do NOT include anything outside these tags.

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## Input Description

* **instruction**: The final goal in natural language.
* **house_content**: The only valid rooms/objects/locations you may reference.
* **original_cot**: The previous subtask decomposition that needs correction.
* **evaluator feedback**: The explicit list of problems in original_cot that you must fix.

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## Your Responsibilities

### (A) shortcoming_analysis (STRICT SCOPE)

This subsection must focus **only** on: *how to revise original_cot according to evaluator feedback*.
Do **not** provide general planning tips or unrelated reasoning.

In `<shortcoming_analysis>`, do the following:

1. **Restate the instruction goal** in one sentence (to anchor what "success" means).
2. **Extract evaluator feedback into a checklist** of concrete fix-items (bullet points or numbered).
3. For **each** fix-item, explain **exactly how you will modify the original_cot** to address it.
   Examples of allowed fix strategies:

   * If feedback says "too detailed / reads like low-level actions": rewrite into fewer, goal-oriented subtasks while preserving key dependencies.
   * If feedback says "missing subtask X": add one subtask at the appropriate position.
   * If feedback says "wrong object/location": replace with valid references from house_content.
   * If feedback says "ordering infeasible": reorder subtasks to satisfy dependencies (e.g., acquire tools before using them; open before retrieving; prepare before serving).
4. **Granularity constraint reasoning**: briefly state how you will keep the number/level of subtasks close to original_cot *while still fixing all issues*.

### (B) fixed_cot (REVISED SUBTASK LIST)

In `<fixed_cot>`, output the corrected hierarchical subtask decomposition:

* Must be a **numbered list**: `1. ... 2. ...`
* Each item must be a **subtask** (goal-oriented), not low-level actions.
* Must **directly fix every issue** raised in evaluator feedback.
* Must reference **only** rooms/objects/locations that exist in `house_content`.
* Must be **internally feasible** (no contradictory ordering; dependencies satisfied).
* Keep **granularity close** to original_cot when feasible:

  * Avoid exploding into many micro-subtasks.
  * Avoid collapsing many distinct original subtasks into one.
  * You may adjust the number of subtasks **only if necessary** to fix evaluator feedback or to ensure the instruction is fully achieved.

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## Output Format (STRICT)

<shortcoming_analysis>
(only: feedback-driven fix plan for revising original_cot)
</shortcoming_analysis>

<fixed_cot>
...
</fixed_cot>

Do NOT include anything outside these tags.