iPOE: Interpretable Prompt Optimization via Explanations
Pith reviewed 2026-05-20 10:49 UTC · model grok-4.3
The pith
Guidelines derived from annotation explanations optimize prompts and improve LLM performance by up to 35 percent.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The central claim is that guiding prompt optimization with guidelines automatically derived from explanations of annotation decisions, refined by a series of operations including removing, adding, shuffling, and merging, results in prompts that are both interpretable and higher-performing for LLMs on classification tasks.
What carries the argument
The iPOE method, which generates a set of guidelines from explanations of annotation decisions and optimizes them via remove, add, shuffle, and merge operations to produce transparent annotation instructions for the LLM.
Load-bearing premise
That guidelines automatically derived from explanations of annotation decisions, when refined by the listed operations, will produce prompts that are both more transparent and measurably higher-performing for LLMs on the target tasks.
What would settle it
A direct comparison on the same four datasets where iPOE guidelines yield no accuracy gain or no increase in transparency relative to prompts without guidelines or with random guidelines.
Figures
read the original abstract
Prompt optimization has often been framed as a discrete search problem to find high-performing and robust instructions for an LLM. However, the search result might not make it transparent why and where specific prompt changes lead to performance gains. This is in contrast to how humans are instructed for annotation tasks. Here, researchers carefully design annotation guidelines, leading to enhanced annotation consistency. Our paper aims at joining these two approaches and introduces iPOE, a novel interpretable prompt optimization strategy via explanations. We guide the prompt optimization process by automatically created guidelines from explanations of annotation decisions (either automatically generated or from humans). This set of guidelines is furthermore optimized by as series of operations, including removing, adding, shuffling, and merging. The resulting prompt includes guidelines that instruct the annotation, making the decision process of the LLM and the optimization transparent. It therefore supports also laypeople in the area of prompt optimization, particularly in challenging domains requiring expertise. In our experiments on four datasets, we find that iPOE can improves over the evaluated baselines by up to 39% and LLM explanations can replace human explanations in the proposed method. Moreover, our interpretability validation study demonstrates that humans and LLMs can substantially agree on which guidelines contribute to their annotations, achieving a Cohen's kappa score of up to 0.65.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript introduces iPOE, a method for interpretable prompt optimization that automatically derives annotation guidelines from explanations of decisions (human or LLM-generated), refines this set via operations including removal, addition, shuffling, and merging, and incorporates the guidelines into LLM prompts. Experiments across four datasets demonstrate that iPOE prompts outperform those without guidelines by up to 31% and those with randomly selected guidelines by up to 35%, while also showing that LLM explanations can effectively replace human explanations.
Significance. If the empirical results hold after addressing potential confounds in the experimental design, this work would meaningfully advance prompt optimization research by aligning it with human annotation guideline practices. It offers a route to more transparent and accessible prompt engineering, with practical benefits for non-expert users in specialized domains and the demonstrated feasibility of substituting LLM-generated explanations for human ones.
major comments (2)
- [Experimental section] Experimental section (and abstract): The reported performance gains of up to 31% and 35% are presented without details on dataset sizes, baseline prompt construction procedures, statistical testing, or any controls that match total instruction length, number of guidelines, or structural complexity between the iPOE condition and the no-guideline/random-guideline baselines. This omission leaves open the possibility that gains arise from added prompt elaboration rather than from the explanation-derived guideline content or the listed refinement operations, which is load-bearing for the central claim that the proposed derivation process drives the improvements.
- [§3 (Method)] §3 (Method): The description of the guideline refinement operations (remove, add, shuffle, merge) does not specify selection criteria, ordering, or iteration limits, nor does it include an ablation isolating their contribution from the baseline effect of simply providing more detailed instructions. Without this, it is difficult to confirm that the transparency and performance benefits are attributable to the iPOE process rather than generic prompt expansion.
minor comments (1)
- [Abstract] Abstract: 'as series of operations' should read 'a series of operations'; 'can improves' should read 'can improve'.
Simulated Author's Rebuttal
We thank the referee for the constructive and detailed feedback. We address each major comment below, providing clarifications where possible and committing to revisions that strengthen the experimental rigor and methodological transparency of the manuscript.
read point-by-point responses
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Referee: [Experimental section] Experimental section (and abstract): The reported performance gains of up to 31% and 35% are presented without details on dataset sizes, baseline prompt construction procedures, statistical testing, or any controls that match total instruction length, number of guidelines, or structural complexity between the iPOE condition and the no-guideline/random-guideline baselines. This omission leaves open the possibility that gains arise from added prompt elaboration rather than from the explanation-derived guideline content or the listed refinement operations, which is load-bearing for the central claim that the proposed derivation process drives the improvements.
Authors: We agree that additional experimental details are necessary to rule out confounds from prompt length or elaboration. In the revised manuscript we will report exact dataset sizes and splits for all four datasets, provide a precise description of baseline prompt construction (including how no-guideline and random-guideline prompts were generated), include statistical significance tests (paired t-tests or McNemar’s test across multiple seeds), and add length- and complexity-matched controls. While the existing random-guideline baseline already holds the number of guidelines constant, we will introduce an explicit length-matched baseline that adds generic elaboration without explanation-derived content. These changes will directly address whether the observed gains are attributable to the iPOE derivation and refinement process. revision: yes
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Referee: [§3 (Method)] §3 (Method): The description of the guideline refinement operations (remove, add, shuffle, merge) does not specify selection criteria, ordering, or iteration limits, nor does it include an ablation isolating their contribution from the baseline effect of simply providing more detailed instructions. Without this, it is difficult to confirm that the transparency and performance benefits are attributable to the iPOE process rather than generic prompt expansion.
Authors: We acknowledge that §3 requires greater specificity. The revised manuscript will expand the description of each operation with explicit selection criteria (e.g., removal of redundant or low-impact guidelines based on validation-set performance, addition of new guidelines derived from remaining explanations, shuffling to test robustness, and merging for conciseness), the sequence in which operations are applied, and iteration limits (e.g., until validation performance stabilizes). We will also add an ablation that compares the full iPOE pipeline against a control condition receiving an equivalent volume of additional instructions generated without the explanation-derived guidelines or the listed refinement operations. This ablation will help isolate the contribution of the iPOE process from generic prompt expansion. revision: yes
Circularity Check
No significant circularity; empirical method evaluated against external baselines
full rationale
The paper describes a procedural algorithm: guidelines are automatically derived from annotation explanations (human or LLM-generated), then refined via explicit operations (remove, add, shuffle, merge) before insertion into the prompt. Performance is assessed via direct empirical comparisons on four datasets against two external baselines (prompts without guidelines; prompts with randomly selected guidelines), reporting relative gains of up to 31% and 35%. No equations, fitted parameters, or self-referential definitions appear in the provided text. The central claims rest on measurable task accuracy rather than reducing to construction by definition, self-citation chains, or renaming of prior results. The derivation chain is therefore self-contained as an engineering procedure whose validity is tested externally.
discussion (0)
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