Automated Root-Cause Subclassification and No-Code Fix Generation for Invalid Bug Reports

Emre Dinc; Eray Tuzun; Mahmut Furkan Gon; Tevfik Emre Sungur

arxiv: 2605.17561 · v2 · pith:M5LOKMGPnew · submitted 2026-05-17 · 💻 cs.SE · cs.AI· cs.MA

Automated Root-Cause Subclassification and No-Code Fix Generation for Invalid Bug Reports

Mahmut Furkan Gon , Emre Dinc , Tevfik Emre Sungur , Eray Tuzun This is my paper

Pith reviewed 2026-05-19 22:21 UTC · model grok-4.3

classification 💻 cs.SE cs.AIcs.MA

keywords invalid bug reportsroot cause subclassificationno-code fixeslarge language modelsretrieval augmented generationagentic systemssoftware maintenancebug triage

0 comments

The pith

Large language models with retrieval and agent techniques can subclassify root causes of invalid bug reports and generate no-code fixes.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper defines a taxonomy that breaks invalid bug reports into root-cause subclasses such as non-reproducibility, feature requests, questions, and working as designed. It then compares three LLM configurations on a manually labeled collection of real reports to see how accurately each can assign the subclasses and how well each can draft no-code resolutions. Retrieval augmented generation performs best at subclassification while agentic web search performs best at producing usable fixes. If these automated steps prove reliable, customer support teams could shift from full manual review of every invalid report to a faster assisted workflow. The gold-standard benchmark supplies the ground-truth labels and example fixes used for all measurements.

Core claim

The authors establish a standardized taxonomy for root-cause subclassification of invalid bug reports and demonstrate through controlled experiments that different LLM setups can both detect those subclasses and generate matching no-code fixes, with results compared directly against the original human-labeled data from the reports.

What carries the argument

The standardized taxonomy of invalid bug report root-cause subclasses together with LLM configurations that add retrieval augmentation or agentic web search.

Load-bearing premise

The manually created set of labeled bug reports accurately reflects the distribution and characteristics of invalid reports that occur in real software projects.

What would settle it

Apply the same subclassification and fix-generation pipeline to a fresh collection of bug reports that have been independently labeled by multiple human experts and measure the level of agreement.

Figures

Figures reproduced from arXiv: 2605.17561 by Emre Dinc, Eray Tuzun, Mahmut Furkan Gon, Tevfik Emre Sungur.

**Figure 2.** Figure 2: Overview of Evaluation Benchmark Curation Workflow [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗

**Figure 3.** Figure 3: Overview of IssueSupport Methodology C. IssueSupport Methodology We experimented with four distinct methodologies: (1) Vanilla LLM Pipeline, (2) Vanilla LLM Pipeline Without Prior Invalid Subclass Information, (3) RAG Pipeline, and (4) Agentic Web Search Pipeline. The tested methodologies return one invalid subclass and one suggested no-code fix, except for (2), and differ based on the tools and sources th… view at source ↗

**Figure 4.** Figure 4: Evaluation prompt for the Judge LLM. It employs a contrastive three-part assessment approach, providing the Judge [PITH_FULL_IMAGE:figures/full_fig_p012_4.png] view at source ↗

read the original abstract

Issues faced when using software are reported in the form of bug reports. However, many bug reports are invalid, meaning they do not require code changes, and are resolved with a no-code fix. Manually determining the root cause of the invalid bug reports and providing actionable resolutions by the customer support causes a serious waste of resources. Our goal is to introduce a standardized taxonomy for root-cause oriented invalid bug report subclassification, and perform experiments to test the accuracy of various approaches on invalid subclassification and no-code fix generation. We study how different configurations perform on a gold-standard benchmark we have created. Using a manually curated benchmark for higher quality analysis, we experimented with vanilla LLMs, Retrieval Augmented Generation, and agentic web search to identify invalid subclasses and generate no-code fixes. We evaluated the results against manually labeled ground truth data that includes the invalid subclass and no-code fixes from the original bug reports. We measured subclass detection performance with weighted F1-Score, and assessed no-code fix suggestions using BERTScore and Judge LLM success rates. For subclassification, retrieval augmented generation achieves the highest overall performance with 0.66 weighted F1, slightly outperforming vanilla LLMs at 0.65 and agentic web search at 0.64. At the subclass level, performance peaks at 0.85 F1 for Non-reproducibility and 0.79 for Feature Request and Question, while Wrong Version remains the most challenging with scores between 0.00 and 0.29. For no-code fix generation, agentic web search achieves the highest overall Judge LLM success rate at 68.9%, compared to 64.4% for RAG applications and 64.9% for vanilla LLMs, with subclass-level peaks of 87.4% for Working as Designed and 72.2% for Question.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

New taxonomy and benchmark for invalid bug report subclassification, with RAG edging out on F1 and agentic search on judge scores, but the fix evaluation rests on an unvalidated LLM proxy.

read the letter

The key takeaway from this paper is a new taxonomy for root-cause subclassification of invalid bug reports along with a fresh manually labeled benchmark, plus head-to-head tests of vanilla LLMs, RAG, and agentic search for both classification and no-code fix suggestions. They report RAG achieving the best weighted F1 of 0.66 on subclassification, with agentic search at 68.9% judge success for fixes. The work breaks down performance by subclass, highlighting easier cases like Non-reproducibility and tougher ones like Wrong Version. Releasing the benchmark stands out as a concrete contribution that others can build on. The experiments apply known methods without major new inventions, but the focus on invalid reports and no-code resolutions fills a gap in bug report handling literature. The use of an external judge LLM and ground truth from original reports keeps things somewhat independent. A soft spot is the lack of human validation for the judge LLM scores. Without correlation data or inter-rater checks against experts, the 68.9% figure for agentic search rests on an untested proxy, and small differences over other methods could shift with better evaluation. The abstract omits benchmark size and agreement stats, though the full text likely covers more. This paper suits researchers in software engineering who work on support automation or LLM tools for triage. It offers practical metrics and a dataset for a real workflow issue. The evidence is solid enough on the benchmark creation and basic comparisons to merit peer review, even with room for improvement on evaluation rigor. I recommend putting it through peer review with feedback on validating the automated judge.

Referee Report

2 major / 2 minor

Summary. The paper introduces a standardized taxonomy for root-cause subclassification of invalid bug reports and evaluates vanilla LLMs, retrieval-augmented generation (RAG), and agentic web search on a manually curated gold-standard benchmark for both subclassification (via weighted F1) and no-code fix generation (via BERTScore and Judge LLM success rates). It reports RAG achieving the highest overall weighted F1 of 0.66 for subclassification (with peaks at 0.85 for Non-reproducibility) and agentic web search reaching the highest Judge LLM success rate of 68.9% for fix generation (with peaks at 87.4% for Working as Designed).

Significance. If the results hold, this work has moderate practical significance for software engineering by providing an empirical comparison of LLM configurations to automate triage and resolution of invalid bug reports, potentially reducing manual support effort. The concrete metrics against an independently labeled ground-truth set and the use of an external judge LLM (avoiding internal circularity) are strengths that support reproducibility and falsifiability of the performance claims.

major comments (2)

[Results for no-code fix generation] Evaluation of no-code fix generation (results paragraph reporting 68.9% Judge LLM success rate): the claim that agentic web search outperforms RAG (64.4%) and vanilla LLMs (64.9%) rests on an unvalidated LLM judge proxy; no inter-rater agreement, correlation coefficient with human experts, or calibration study is reported for criteria such as actionability or true 'no-code' qualification, which is load-bearing for the central superiority claim given known divergences between LLM and human judgments on nuanced software-resolution tasks.
[Benchmark creation and evaluation methodology] Benchmark and evaluation setup (abstract and results sections): the gold-standard benchmark size, inter-annotator agreement for the manual labels, prompt templates, and any statistical significance tests for the small performance margins (e.g., 0.66 vs. 0.65 weighted F1) are not reported; without these, the robustness of both headline performance claims cannot be fully assessed.

minor comments (2)

[Methodology] The paper should include the full prompt templates and agentic workflow details in an appendix to support reproducibility of the RAG and web-search configurations.
[Evaluation metrics] Clarify whether BERTScore was computed against the original no-code fixes or a reference set, and report the specific BERTScore values alongside the Judge LLM rates for completeness.

Simulated Author's Rebuttal

2 responses · 0 unresolved

Thank you for the opportunity to respond to the referee report. We have carefully considered the major comments and outline our responses and planned revisions below.

read point-by-point responses

Referee: [Results for no-code fix generation] Evaluation of no-code fix generation (results paragraph reporting 68.9% Judge LLM success rate): the claim that agentic web search outperforms RAG (64.4%) and vanilla LLMs (64.9%) rests on an unvalidated LLM judge proxy; no inter-rater agreement, correlation coefficient with human experts, or calibration study is reported for criteria such as actionability or true 'no-code' qualification, which is load-bearing for the central superiority claim given known divergences between LLM and human judgments on nuanced software-resolution tasks.

Authors: We thank the referee for highlighting this important aspect of our evaluation. While we also provide BERTScore as a complementary automatic metric, we acknowledge the value of validating the LLM judge. In the revised version of the manuscript, we will include a small-scale human calibration study on a subset of the no-code fix generations to compute agreement with the Judge LLM, along with a discussion of the criteria used for 'actionability' and 'no-code' qualification. This will help substantiate the reported superiority of agentic web search. revision: yes
Referee: [Benchmark creation and evaluation methodology] Benchmark and evaluation setup (abstract and results sections): the gold-standard benchmark size, inter-annotator agreement for the manual labels, prompt templates, and any statistical significance tests for the small performance margins (e.g., 0.66 vs. 0.65 weighted F1) are not reported; without these, the robustness of both headline performance claims cannot be fully assessed.

Authors: We agree that providing these details is essential for assessing the reliability of our results. In the revision, we will explicitly state the size of our gold-standard benchmark, report the inter-annotator agreement achieved during the manual labeling process, include the prompt templates in the appendix or supplementary material, and conduct and report appropriate statistical significance tests (such as McNemar's test) for the differences in weighted F1 scores and success rates. These additions will address the concerns about robustness. revision: yes

Circularity Check

0 steps flagged

No circularity: empirical results rest on independent benchmark and external judge LLM

full rationale

The paper reports experimental performance numbers (weighted F1 scores for subclassification and Judge LLM success rates for fix generation) obtained by running vanilla LLMs, RAG, and agentic web search against a manually curated gold-standard benchmark whose labels and no-code fixes are taken from the original bug reports. No equations, fitted parameters, or derivations appear in the provided text. No self-citations are invoked to justify uniqueness theorems, ansatzes, or load-bearing premises. The reported metrics are therefore not reducible by construction to quantities the authors themselves defined or fitted inside the same paper.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The study is purely empirical and relies on standard machine-learning evaluation practices rather than new mathematical axioms or invented physical entities.

pith-pipeline@v0.9.0 · 5889 in / 1196 out tokens · 34036 ms · 2026-05-19T22:21:35.727535+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

IndisputableMonolith/Cost/FunctionalEquation.lean washburn_uniqueness_aczel unclear

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unclear
Relation between the paper passage and the cited Recognition theorem.

We experimented with vanilla LLMs, Retrieval Augmented Generation, and agentic web search to identify invalid subclasses and generate no-code fixes... measured subclass detection performance with weighted F1-Score, and assessed no-code fix suggestions using BERTScore and Judge LLM success rates.
IndisputableMonolith/Foundation/RealityFromDistinction.lean reality_from_one_distinction unclear

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unclear
Relation between the paper passage and the cited Recognition theorem.

The final clusters of invalid subclasses are External System & Dependency Issues, Faulty Configuration, Feature Request, Non-reproducible, Question, Working as Designed, and Wrong Version.

What do these tags mean?

matches: The paper's claim is directly supported by a theorem in the formal canon.
supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses: The paper appears to rely on the theorem as machinery.
contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.