arXiv AI

Evaluating Budgeted Context Projection with Unexecuted Companion Runs

The paper examines how budgeted context projection can reduce the length of individual requests while affecting whether an agent completes within its budget. By analyzing a recorded ReVerPi source‑reading campaign, the authors show that retaining all intervention boundaries reveals trade‑offs that are obscured when a capped first continuation prevents companion runs, and they quantify success differences across various task subsets. The study highlights the importance of accounting for every boundary, preserving unknown outcomes, and separating completion from resource use in adaptive evaluation campaigns.

arXiv AI
Sep 28

Completed Pairs Hide Capped Failures: A ReVerPi Case Study of Selective Context Projection

The study examines how context projection—replacing older tool observations with concise, addressable excerpts—affects performance in ReVerPi, a Pi extension that archives observations and matches full to projected continuations. Across 86 source‑reading runs and 641 model requests, 15 completed pairs achieved identical success rates (12/15 per arm), while 12 boundary runs halted when the first arm failed, revealing that projection can reduce logical tokens by 25% but increase median pair tokens by 29% and total suffix requests from 35 to 55. The analysis highlights the importance of retaining all intervention boundaries, executing both arms independently, and reporting completion, token usage, and interaction details to accurately assess stopping rules and resource aggregation.

By Guangzhe Zhang
arXiv Computation and Language
Sep 15

When Agents Slow Down: Understanding LLM Agents' Test-Time Strategies via Elo-per-token Analysis

arXiv:2609.15309v1 Announce Type: new Abstract: Large language model (LLM) agents allocate test-time compute adaptively as they revise solutions, use tools, explore alternatives, and decide when to s...

By Kaiyuan Liu, Qiuyang Mang, Bo Peng, Wenhao Chai, Hanchen Li, Shreyas Pimpalgaonkar, Luke Zettlemoyer, Alex Dimakis, Alvin Cheung
arXiv AI
Sep 25

ERRAND: Budgeted Maintenance of Agent Memory

ERRAND is a new method for budgeted maintenance of agent memory that treats revalidation of stored knowledge as a priced errand competing for scarce actions. It uses an errand index that is single‑peaked, allowing certainty in either direction to cost nothing, and repairs by writing new versions rather than deleting old ones. In experiments across two drifting tool‑use worlds, ERRAND outperforms non‑oracle policies, achieving up to 10.0 percentage points improvement over eager revalidation while using only 11.0% of steps, and it self‑terminates when no budget is imposed.

By Beining Wu, Zihao Ding, Jun Huang
arXiv AI
Oct 9

How Should a Prompt Optimizer Spend a Tight Budget? BudgetAPO with Noise-Adaptive Evaluation

The paper introduces BudgetAPO, a single‑stage prompt optimizer designed for tight‑budget scenarios where only a few hundred model calls are feasible. BudgetAPO adapts the evaluation slice size to each task’s noise level, uses a fixed slice to turn accept/reject decisions into paired comparisons, and applies a reflective operator to jointly rewrite reasoning strategy and output format. Across seven benchmarks and five subject models, BudgetAPO outperforms existing methods, ranking first on every subject and requiring far fewer calls to achieve comparable or superior performance.

By Haoyue Liu, Zhichao Wang, Huanyu Yan, Xiaoying Tang