mcemri/MAST-Data

MAD: Multi-Agent System Traces Dataset

Execution traces from multi-agent systems (MAS), annotated with the Multi-Agent Systems Failure Taxonomy (MAST). Each record gives the MAS, the LLM behind it, the benchmark task, the full trace, and binary annotations for the 14 MAST failure modes.

Code: https://github.com/multi-agent-systems-failure-taxonomy/MAST

1642 traces · 7 MAS frameworks · 8 benchmarks · 5 LLMs.

Files

file	rows
MAD_full_dataset.json	1642	traces with MAST annotations
MAD_human_labelled_dataset.json	19	inter-annotator agreement study, 3 annotators

Schema

field	type
mas_name	string	AG2, MetaGPT, ChatDev, Magentic, AppWorld, HyperAgent, OpenManus
llm_name	string	GPT-4o, Claude, GPT-4o-mini, Qwen, CodeLlama
benchmark_name	string	ProgramDev, ProgramDev-v2, GSM, Olympiad, GAIA, MMLU, Test-C, SWE-Bench-Lite
trace_id	int	index within its config
trace	dict	{key, index, trajectory}
mast_annotation	dict	14 codes → 1, 0, or null where the annotation is unavailable

Taxonomy

Specification — 1.1 Disobey Task Specification · 1.2 Disobey Role Specification · 1.3 Step Repetition · 1.4 Loss of Conversation History · 1.5 Unaware of Termination Conditions

Inter-Agent Misalignment — 2.1 Conversation Reset · 2.2 Fail to Ask for Clarification · 2.3 Task Derailment · 2.4 Information Withholding · 2.5 Ignored Other Agent's Input · 2.6 Reasoning-Action Mismatch

Task Verification — 3.1 Premature Termination · 3.2 No or Incomplete Verification · 3.3 Incorrect Verification

Notes

Annotations are produced by an LLM judge, not by human labelling.

In MAD_human_labelled_dataset.json, each round uses a different revision of the taxonomy (18, 17, 17 and 14 modes) and the codes are not comparable across rounds.

Citation

@inproceedings{cemri2025mast,
  title     = {Why Do Multi-Agent LLM Systems Fail?},
  author    = {Cemri, Mert and Pan, Melissa Z. and Yang, Shuyi and Agrawal, Lakshya A. and Chopra, Bhavya and Tiwari, Rishabh and Keutzer, Kurt and Parameswaran, Aditya and Klein, Dan and Ramchandran, Kannan and Zaharia, Matei and Gonzalez, Joseph E. and Stoica, Ion},
  booktitle = {Advances in Neural Information Processing Systems},
  year      = {2025}
}