Suwan Yoon, Changhee Lee
Text-guided molecular generation with LLMs often yields invalid SMILES. We argue that invalid drafts should be addressed through a shift from validity-oriented repair to identity-preserving molecular recovery: the objective is not only to restore chemical validity, but also to preserve target-relevant structural cues and recover the molecular identity implied by the description. This perspective reveals the limitations of existing correction strategies. Post-hoc repair can recover validity while distorting key structures, LLM-only correction can introduce unintended global drift, and generic agentic correction remains constrained by greedy single-candidate trajectories even when equipped with executable RDKit edit tools. To address these limitations, we propose AMREC, which couples molecule-aware mismatch tracking with expanded candidate exploration and trajectory-level selection. On invalid ChEBI-20 drafts from three backbone models, AMREC achieves the strongest overall recovery profile across structural, exact-match, and string-level metrics.
The paper introduces AMREC, a multi-agent framework that reframes the correction of invalid SMILES outputs from text-guided molecular generation as identity-preserving molecular recovery rather than simple validity repair. The key conceptual contribution is the distinction between "repair" (syntactic validity restoration) and "recovery" (preserving target-relevant structural cues while restoring validity). AMREC uses four LLM-based agents—Checker, Critic, Planner, and Candidate Explorer—to decompose target descriptions into verifiable structural requirements, track molecule-text mismatches, and explore multiple recovery trajectories rather than committing to a single greedy path. The trajectory-level candidate selection mechanism allows revisiting intermediate candidates, addressing the problem of irreversible early errors in greedy agentic search.
Strengths in experimental design: The evaluation uses three backbone LLMs (GPT-5.4-mini, Gemini-3.1-flash-lite, Claude-haiku-4.5) and compares against a comprehensive set of baselines spanning post-hoc repair (SMISELF), LLM-only correction, and both generic and tool-augmented agentic approaches (ReAct, ReWOO, PlanAndAct and their -T variants). The metric suite is thorough, covering structural similarity (MACCS, RDK, Morgan fingerprints), exact match, string-level similarity (BLEU, ROUGE-L, Levenshtein), and distributional distance (FCD).
Concerns:
Immediate applications: The framework is directly applicable to improving the reliability of LLM-based molecular generation pipelines, which is increasingly relevant as LLMs are adopted in computational chemistry and drug discovery. The recovery-vs-repair framing could influence how the community evaluates and handles invalid molecular outputs.
Broader influence: The multi-agent architecture with explicit requirement tracking and trajectory-level selection could generalize beyond molecules to other structured output generation tasks (e.g., protein sequences, chemical reactions, code generation). The identification of "alignment blindness" and "exploration blindness" in agentic search is a useful conceptual framework.
Limitations on impact: The method's reliance on frontier LLM API calls (GPT-5.4-mini, Gemini, Claude) raises cost and reproducibility concerns. The estimated worst-case cost of ~$52 per experiment for a single backbone on ~140 molecules suggests substantial scaling costs for larger chemical libraries. The method is evaluated purely computationally without any wet-lab or expert validation of recovered molecules.
The paper addresses a genuine and growing pain point: as LLMs are increasingly deployed for molecular generation, invalid SMILES rates remain non-trivial. The observation that invalid drafts contain useful structural information (supported by Skinnider 2024) makes the recovery perspective timely. The agentic AI paradigm is currently highly active, and applying it to molecular chemistry is a natural and relevant extension. However, the specific backbone models used (GPT-5.4-mini, etc.) suggest this is targeting very recent model versions, which may affect reproducibility as these APIs evolve.
The paper's formalization as a sequential decision process (Section 3.2) is somewhat surface-level—the transition operator and policy are not formally optimized but rather instantiated through prompt engineering. The connection to reinforcement learning or planning literature is conceptual rather than algorithmic. The qualitative examples are compelling but represent best-case scenarios; systematic performance breakdown by molecule size, complexity, or description specificity would be more informative.
Generated Jun 5, 2026
Paper 1 addresses a fundamental gap in multiagent LLM systems—producing and evaluating aggregated confidence signals—with broad applicability across NLP tasks. Its systematic evaluation across multiple benchmarks, model pairs, and task types demonstrates methodological rigor and generalizability. Paper 2, while solving a real problem (invalid SMILES recovery), addresses a narrower domain with more incremental contributions. Paper 1's framework for confidence aggregation in multiagent systems has broader potential impact as multiagent architectures become increasingly prevalent across many AI applications.
Paper 2 addresses a concrete, well-defined technical problem (invalid SMILES recovery in molecular generation) with a clear methodology and measurable improvements on established benchmarks. It has direct applications in drug discovery and computational chemistry. Paper 1, while addressing an important topic (adversarial robustness of ethical AI), introduces a complex framework with many ad-hoc design choices (22 dimensions, 17 perturbation functions, etc.) that may lack sufficient theoretical grounding. Paper 2's contribution is more actionable, reproducible, and situated within a rapidly growing field with immediate practical impact.
TABVERSE addresses a broader and more fundamental question about how table representation affects LLM/VLM performance, with implications across numerous fields that use tabular data. It introduces a controlled benchmark methodology that can be widely adopted by the community. Paper 1, while technically sound, addresses a narrower problem (invalid SMILES recovery) within a more specialized domain. TABVERSE's systematic evaluation framework, covering multiple models, tasks, and formats, provides actionable insights for a larger research community working on table reasoning and multimodal AI.
Paper 1 likely has higher impact due to broader applicability and timeliness: uncertainty-aligned RL for tool-calling targets a central, general failure mode of LLM agents across many domains (software, search, robotics, workflows). Incorporating uncertainty separation directly into reward design is a novel methodological contribution that could influence post-training and evaluation practices beyond tool use. Paper 2 is innovative and valuable for cheminformatics, but its scope is more domain-specific (SMILES recovery) and may have narrower cross-field spillover despite clear real-world relevance.
Paper 2 addresses a critical bottleneck in text-guided molecular generation (invalid SMILES) with a novel agentic recovery approach. Its interdisciplinary application bridging LLMs and cheminformatics offers high potential for real-world impact in drug discovery and materials science, whereas Paper 1 presents an algorithmic extension within the more narrower scope of foundational reinforcement learning.
Paper 2 likely has higher impact due to broader applicability and timeliness: persona-conditioned synthetic users could meaningfully change UI/UX evaluation workflows across software, HCI, product design, and A/B testing, with clear real-world adoption potential. Its two-stage training (contrastive reflection fine-tuning plus failure-trace prompt evolution) suggests methodological rigor and a general framework for human-aligned agent evaluation. Paper 1 is novel and valuable for cheminformatics/LLM molecular generation, but its impact is narrower to SMILES recovery pipelines and dependent on domain-specific tooling and datasets.
Paper 2 addresses a critical bottleneck in AI-driven drug discovery—generating valid molecular structures from text while preserving specific chemical identities. Its novel agentic approach using trajectory-level exploration provides a fundamental methodological advance over standard LLM corrections. Paper 1 offers a solid but more incremental application of existing curriculum learning and ensemble techniques to medical Q&A. The transformative potential of solving molecular generation challenges in pharmacology gives Paper 2 a higher potential scientific impact.
Paper 1 has higher potential impact due to its broader, timely relevance to LLM safety and deployment: a human-validated, multi-turn benchmark for covert manipulation addresses a widely recognized gap beyond static prompt compliance. It can influence evaluation standards, alignment research, auditing practices, and policy across many application domains. Paper 2 is a solid methodological contribution for molecule generation workflows, but is more specialized to cheminformatics and SMILES recovery; its impact is likely narrower despite clear practical utility.
SciDER addresses a broader and more impactful problem—automating the entire scientific research lifecycle using multi-agent LLM systems. It introduces multiple innovations (Evolutionary Idea Search, dynamic multimodal skill system, data-centric approach), releases open-source resources (dataset and fine-tuned model), and demonstrates results across six benchmarks. Its breadth of impact spans multiple scientific domains. Paper 2, while technically sound, addresses a narrower problem (SMILES validity recovery) with more limited cross-field applicability. SciDER's potential to democratize and accelerate scientific discovery gives it substantially higher impact potential.
Paper 2 addresses a fundamental and widely-encountered problem in AI-driven molecular generation—invalid SMILES outputs from LLMs—with a novel framework (AMREC) that shifts the paradigm from validity repair to identity-preserving recovery. This has broad implications for drug discovery, materials science, and computational chemistry. Paper 1 makes a solid but more incremental contribution (3.7% improvement) to LLM agent clarification, a narrower problem space. Paper 2's cross-cutting relevance to both AI and chemistry, combined with its novel conceptual framing, gives it higher potential impact.