Atomix: Timely, Transactional Tool Use for Reliable Agentic Workflows

Bardia Mohammadi, Nearchos Potamitis, Lars Henning Klein, Akhil Arora, Laurent Bindschaedler

Keywords: LLM agents, transactional tool use, fault recovery, speculative execution, progress predicates, effect isolation, agentic workflows

TL;DR: Atomix wraps LLM tool calls in frontier-gated transactions so that faults trigger automatic retry and speculative branches never leak effects

Abstract: LLM agents increasingly act on external systems, yet tool effects are immediate. Under failures, speculation, or contention, losing branches can leak unintended side effects with no safe rollback. We introduce Atomix, a runtime that provides progress-aware transactional semantics for agent tool calls. Atomix tags each call with an epoch, tracks per-resource frontiers, and commits only when progress predicates indicate safety; bufferable effects can be delayed, while externalized effects are tracked and compensated on abort. Across real workloads with fault injection, transactional retry improves task success, while frontier-gated commit strengthens isolation under speculation and contention.

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Submission Number: 216