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arxiv: 2606.28044 · v1 · pith:5QMC7AYRnew · submitted 2026-06-26 · 💻 cs.CL

A Tree-of-Thoughts Inspired Hybrid Approach for Legal Case Judgement Summarization using LLMs

Pith reviewed 2026-06-29 04:17 UTC · model grok-4.3

classification 💻 cs.CL
keywords legal case summarizationextractive-abstractive summarizationtree-of-thoughtslarge language modelshybrid promptingDeepSeekLlamajudgement summarization
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The pith

A tree-of-thoughts inspired extractive-abstractive prompt produces better legal case summaries than pure extractive or abstractive LLM prompts.

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

The paper introduces a hybrid summarization method for legal judgements that first extracts key segments and then rewrites them abstractively, structured via tree-of-thoughts style reasoning. Experiments compare this approach against standalone extractive and abstractive prompts using the DeepSeek and Llama models. The hybrid prompt is reported to yield superior summaries. A sympathetic reader would care because legal judgements are typically long and dense, so more effective summarization could reduce the time required to extract relevant information. The work positions the hybrid technique as a practical improvement for this domain-specific task.

Core claim

The authors propose a novel tree-of-thoughts inspired extractive-abstractive summarization approach for legal judgement summarization. They conduct experiments using two popular LLMs, DeepSeek and Llama, and compare among extractive, abstractive and extractive-abstractive summarization. Their experiments show that the proposed extractive-abstractive prompt provides better summaries compared to other types of LLM prompts.

What carries the argument

The tree-of-thoughts inspired extractive-abstractive prompt, which directs the LLM to extract important elements from the case and then generate an abstractive summary in a structured reasoning sequence.

If this is right

  • Practitioners can obtain more usable summaries of lengthy legal judgements by switching to hybrid prompts.
  • The same extractive-abstractive structure may improve LLM performance on other long, structured documents.
  • Future prompt engineering for legal tasks should prioritize hybrid modes over single-mode approaches.
  • Model choice between DeepSeek and Llama may matter less than the choice of prompt style for this task.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If the hybrid method generalizes, it could reduce the need for separate extractive preprocessing steps in legal NLP pipelines.
  • The approach might be extended by incorporating explicit legal reasoning trees rather than generic thought structures.
  • Testing the method on additional legal datasets with known ground-truth summaries would clarify its robustness.

Load-bearing premise

That the quality judgments used in the experiments reliably reflect legal accuracy and practical usefulness for case summaries.

What would settle it

A follow-up evaluation in which legal experts directly compare the hybrid summaries against extractive and abstractive ones on metrics of factual correctness and completeness, finding no consistent advantage for the hybrid method.

read the original abstract

In recent times, Large Language Models (LLMs) are increasingly being used for legal case judgement summarization. Most prior works have tried traditional extractive and abstractive summarization of case judgements. However, hybrid or extractive-abstractive techniques have not been explored much. In this work, we propose a novel tree-of-thoughts inspired extractive-abstractive summarization approach for legal judgement summarization. We conduct experiments using two popular LLMs, DeepSeek and LLama, and compare among extractive, abstractive and extractive-abstractive summarization. Our experiments show that the proposed extractive-abstractive prompt provides better summaries compared to other types of LLM prompts.

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.

Referee Report

1 major / 2 minor

Summary. The paper proposes a tree-of-thoughts inspired hybrid extractive-abstractive prompting method for legal case judgment summarization. It compares this approach to pure extractive and abstractive LLM prompts using DeepSeek and Llama models, claiming that the hybrid method produces better summaries based on conducted experiments.

Significance. If the superiority claim is substantiated with proper metrics and protocols, the hybrid ToT-inspired prompting could offer a structured way to combine extractive fidelity with abstractive fluency for legal texts, potentially improving downstream legal applications. The work does not include machine-checked proofs, reproducible code releases, or parameter-free derivations.

major comments (1)
  1. [Experiments / Results] The central claim that 'the proposed extractive-abstractive prompt provides better summaries' (abstract) is load-bearing but unsupported: no dataset (source, size, selection criteria), no automatic metrics (ROUGE, BERTScore or legal-specific), no human evaluation rubric, inter-annotator agreement, or statistical tests are reported anywhere in the manuscript. This prevents verification that observed differences exceed prompt-engineering artifacts.
minor comments (2)
  1. [Abstract] The abstract and introduction use 'better summaries' without defining the quality criteria or evaluation protocol.
  2. [Method] Notation for the tree-of-thoughts structure (e.g., how thoughts are branched and merged in the prompt) is not formalized or illustrated with an example prompt.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for highlighting the critical gaps in experimental reporting. We agree that the current version of the manuscript does not adequately substantiate the central claim and will make substantial revisions to address this.

read point-by-point responses
  1. Referee: [Experiments / Results] The central claim that 'the proposed extractive-abstractive prompt provides better summaries' (abstract) is load-bearing but unsupported: no dataset (source, size, selection criteria), no automatic metrics (ROUGE, BERTScore or legal-specific), no human evaluation rubric, inter-annotator agreement, or statistical tests are reported anywhere in the manuscript. This prevents verification that observed differences exceed prompt-engineering artifacts.

    Authors: We fully acknowledge this limitation. The manuscript as submitted contains only high-level statements about conducting experiments with DeepSeek and Llama but provides none of the required details on data, metrics, or evaluation protocols. In the revised manuscript we will add a complete Experiments section that specifies: (1) the dataset source, size, and selection criteria; (2) the automatic metrics used (ROUGE, BERTScore, and any legal-specific measures); (3) the human evaluation rubric, number of annotators, and inter-annotator agreement; and (4) appropriate statistical tests comparing the three prompting strategies. We will also release the exact prompts and any available code to allow verification that differences are not merely prompt-engineering artifacts. revision: yes

Circularity Check

0 steps flagged

No circularity; empirical prompting comparison is self-contained

full rationale

The paper is an empirical study comparing extractive, abstractive, and hybrid extractive-abstractive LLM prompts for legal summarization, with the central claim resting on experimental outcomes. No equations, fitted parameters, self-definitional reductions, or load-bearing self-citations appear in the provided abstract or description. The derivation chain consists solely of prompt design and result reporting, with no steps that reduce by construction to inputs. This matches the reader's assessment of minimal circularity and qualifies as a normal non-finding under the guidelines.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No mathematical model or derivation is present; the work is an empirical prompting study with no free parameters, axioms, or invented entities.

pith-pipeline@v0.9.1-grok · 5652 in / 981 out tokens · 33965 ms · 2026-06-29T04:17:49.891594+00:00 · methodology

discussion (0)

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Reference graph

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