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BooksMonograph

Evaluating Language Model Agents: Principles, metrics and practice

Lena Hartwell, Kofi Mensah

1st edition · 312 pages · ISBN 978-0-00-100001-2 · 30 September 2026 · 10.xxxx/ctm.bk.2026.0001

A practical and rigorous guide to measuring what agents actually do. The book develops a measurement framework for tool-using language agents, covers reliability, cost and safety metrics, and shows how to design benchmarks, report variance and avoid the most common evaluation mistakes. Worked examples and code accompany every chapter.

Read book PDF 5,240 2,8606 cited
PreprintsResearch ArticleNot peer reviewed

Tokenizer Effects on Low-Resource Language Adaptation

Oluwaseun Adebayo, Mei Tanaka

Version 1 · 12 September 2026 · 10.xxxx/ctm.pp.2026.0005

Adapting a pretrained model to a low-resource language often begins with extending the tokenizer, yet the choice of extension method is rarely compared. We evaluate five vocabulary-extension strategies on six languages and find that fertility reduction alone does not predict downstream accuracy. Strategies that initialise new embeddings from semantically related tokens consistently outperform random initialisation, at the same training budget.

Abstract PDF 1,890 6032 cited
PublishingPerspectivePeer reviewed

Governing Autonomous Software Agents: Accountability Before Capability

Sofia Lindqvist

Version 3 · 3 reviewer reports · 4 September 2026 · 10.xxxx/ctm.pb.2026.0005

Debate about autonomous AI agents often centres on what they can do. This perspective argues that governance should instead start from who is accountable when an agent acts. Drawing on analogies from aviation, finance and medical devices, we propose three design requirements for deployed agents — attributable identity, bounded authority and reconstructable action logs — and discuss how each could be audited. We argue that these requirements are technically modest, can be adopted before agents become more capable, and would make later regulation easier to apply.

Abstract PDF 1,893 6401 cited
PublishingResearch ArticleUnder peer review

Quantisation-Aware Distillation for On-Device Assistants

Daniel Okafor, Yuki Saito, Priya Venkataraman

Version 1 · 1 reviewer report · 28 August 2026 · 10.xxxx/ctm.pb.2026.0006

Running assistant-grade language models on phones requires both small models and low-precision arithmetic, yet distillation and quantisation are usually applied one after the other. We train a 1.3B-parameter student with distillation losses computed through simulated 4-bit quantisation, so that the student learns to be robust to its own rounding error. Compared with distilling first and quantising afterwards, the joint procedure recovers 41% of the accuracy lost to 4-bit quantisation, reaches 94% of the full-precision student on a suite of assistant tasks, and runs 3.1× faster on a mid-range mobile processor.

Abstract PDF 2,144 7862 cited