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Research

The first section is papers I wrote. Below it is the reading trail that informs the work, where each line is what that paper is for here, not an abstract.

Papers

2026.9 · Janghoon Lee · arXiv:2609.18672
Selection Is Retrieval, Abstention Is Not: On-Device Tool Routing over 70 Korean-English Actions
Over 70 Korean and English actions on device, picking the right tool behaves like retrieval, but deciding not to call any tool does not, so the two need separate treatment.
2026.9 · Janghoon Lee · arXiv:2609.06129
Protocol Compression Changes Which Party Pays: Bilateral Cost in Cross-Organization LLM Agent Communication
In cross-organization LLM agent communication, compressing the protocol does not cut total cost but shifts which side pays it, measured on both parties of the exchange.
2026.8 · Janghoon Lee · arXiv:2608.23023
Most of the LLM Routing Gap Is Task Type: A Task-Type and Language Decomposition over a Fully Executed 14×294 Matrix, and the Reproducibility Floor It Has to Clear
A full 14-model, 294-query matrix across seven task types and three languages finds that task type explains most of the reproducible routing gap, while language recovers only a small additional share.
2026.8 · Janghoon Lee · arXiv:2608.13959
Repair, Not Improvement: Decomposing Constrained Decoding in Tool-Call Abstention
Separates lexical masking from termination effects in constrained tool calling and shows that constraints often repair malformed output rather than improve the model's abstention judgment.

References