Tracelint tool catches ignored AI agent tool errors deterministically in CI pipelines

A new open-source tool called tracelint acts as a linter for AI agent execution traces, flagging structural bugs such as ignored tool errors, stuck loops, and schema violations without relying on a language model. The tool reads agent run traces in formats like OpenInference, Langfuse, and OpenAI, then returns deterministic exit codes suitable for gating CI pipelines. Unlike LLM-based judges, which have low localization accuracy and are non-deterministic, tracelint identifies exactly which trace step contains a defect and provides the relevant evidence. It can be installed via pip and integrates directly with observability platforms such as Arize Phoenix and Langfuse using existing telemetry data. The tool was validated against real OpenInference exports and successfully localized a genuine tool failure in a Phoenix trace without any model involvement.