Learning to Hand Off: Provably Convergent Workflow Learning under Interface Constraints
Pith reviewed 2026-05-20 10:02 UTC · model grok-4.3
The pith
IC-Q delivers a finite-sample error bound for neural Q-learning in decentralized multi-agent handoff workflows using only local observations and single-scalar coordination.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The authors establish a finite-sample bound for neural IC-Q in IC-SMDPs that decomposes into neural function-approximation error, interface representation gap, and mixing-time residual under the random option-duration discount. Establishing the bound requires lifting the approximate information state framework from single-agent primitive-step MDPs to multi-agent SMDPs and controlling Markovian noise under random durations, steps not previously achieved. The result yields the first finite-sample guarantee for neural Q-learning under decentralized partial observability, with experiments confirming that IC-Q matches a centralized oracle without any agent observing joint trajectories.
What carries the argument
IC-Q, the asynchronous decentralized Q-learning algorithm that coordinates agents at handoffs using exactly one scalar in an interface-constrained semi-Markov decision process, with error controlled via the lifted approximate information state framework.
If this is right
- Each of the three error sources can be reduced separately by enlarging the neural network, improving the interface representation, or adjusting the random-duration discount.
- IC-Q reaches centralized-oracle performance on multi-LLM mathematical reasoning, multi-agent routing, and multi-agent CPU programming tasks.
- Learning remains convergent even though no agent ever observes joint trajectories or receives centralized data.
- The bound holds for variable handoff times because the random option-duration discount accounts for the mixing-time residual.
Where Pith is reading between the lines
- The same error decomposition could guide interface design in other decentralized systems such as distributed robotics or sensor networks that share only partial observations.
- Organizations could adopt single-scalar handoff protocols to achieve convergent workflow learning while keeping data sharing minimal.
- Testing the bound at larger scale in production LLM agent pipelines would directly check whether the three terms remain independently controllable.
Load-bearing premise
The approximate information state framework can be lifted from single-agent MDPs to multi-agent SMDPs while controlling Markovian noise under random option durations.
What would settle it
A controlled synthetic IC-SMDP experiment in which the three error terms fail to scale independently when neural network capacity, interface dimension, and discount factor are varied one at a time.
read the original abstract
We study workflow learning in a setting where specialized agents hand off control through a shared artifact, each agent observes only a local function of that artifact and its own private state, and no centralized learner accesses joint trajectories -- the operating regime of multi-agent LLM pipelines that span organizational, vendor, or trust boundaries. We formalize this regime as an interface-constrained semi-Markov decision process (IC-SMDP), whose decision epochs occur at handoff times, and design IC-$Q$, an asynchronous decentralized $Q$-learning algorithm in which cross-agent coordination at every handoff is exactly one scalar. Our main result is a finite-sample bound for neural IC-$Q$ that decomposes into three independently controllable error sources: neural function-approximation error, interface representation gap, and a mixing-time residual, under the random option-duration discount. Establishing this bound requires lifting the approximate information state (AIS) framework from single-agent primitive-step MDPs to multi-agent SMDPs and controlling Markovian noise under random duration, neither of which has been done in prior work. To our knowledge this is the first finite-sample guarantee for neural $Q$-learning under decentralized partial observability. Four experiments: a controlled synthetic IC-SMDP that validates the bound term-by-term, multi-LLM mathematical reasoning, multi-agent routing, and multi-agent CPU programming, show that IC-$Q$ matches a centralized oracle without any agent observing joint trajectories, with each of the three error sources scaling along its corresponding axis as the bound predicts.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript formalizes multi-agent handoff workflows through a shared artifact (with each agent observing only a local function of the artifact and its private state, and no centralized access to joint trajectories) as an interface-constrained semi-Markov decision process (IC-SMDP). It introduces the asynchronous decentralized IC-Q algorithm, which uses exactly one scalar for cross-agent coordination at each handoff. The central claim is a finite-sample bound for neural IC-Q that decomposes into three independently controllable error sources—neural function-approximation error, interface representation gap, and mixing-time residual—under the random option-duration discount. This bound is obtained by lifting the approximate information state (AIS) framework from single-agent primitive-step MDPs to multi-agent SMDPs while controlling Markovian noise under random durations. Experiments include term-by-term validation on a synthetic IC-SMDP plus three applied tasks (multi-LLM mathematical reasoning, multi-agent routing, and multi-agent CPU programming) showing IC-Q matches a centralized oracle.
Significance. If the bound and its decomposition hold, the result would be the first finite-sample guarantee for neural Q-learning under decentralized partial observability in an SMDP setting, directly relevant to multi-LLM pipelines spanning organizational boundaries. The explicit three-term decomposition, the term-by-term synthetic validation, and the reproducible experimental design that isolates each error source along its predicted axis are notable strengths. The work also supplies the first extension of the AIS framework to this multi-agent, random-duration regime.
major comments (2)
- [§4 (main finite-sample bound, Theorem 1)] §4 (main finite-sample bound, Theorem 1): The claimed decomposition into three independently controllable terms requires that the lifted AIS framework fully absorbs Markovian noise induced by random option durations so that no residual correlation appears between the interface representation gap and the mixing-time residual. The provided derivation steps do not explicitly verify this independence under stochastic handoff times; if such dependence remains, the three-term separation fails.
- [§3.2 (AIS lifting)] §3.2 (AIS lifting): The extension of the approximate information state from single-agent MDPs to multi-agent IC-SMDPs must ensure the local observation of the shared artifact remains a sufficient statistic when handoffs occur at random durations. The manuscript states this lifting has not been done previously, yet the precise assumptions on the duration distribution and the resulting Markovian noise control are not shown in sufficient detail to confirm sufficiency.
minor comments (2)
- [Abstract] Abstract: Expand 'IC-SMDP' and 'IC-Q' on first use and briefly define the random option-duration discount for readers unfamiliar with the SMDP literature.
- [Figure 2 (synthetic validation)] Figure 2 (synthetic validation): The caption should explicitly state which experimental axis corresponds to each of the three error terms in the bound to make the term-by-term match immediately visible.
Simulated Author's Rebuttal
We thank the referee for the careful reading, the positive assessment of the significance, and the constructive comments on the proof details. We address each major comment below and will revise the manuscript to incorporate additional explicit verification and assumptions as requested.
read point-by-point responses
-
Referee: [§4 (main finite-sample bound, Theorem 1)] §4 (main finite-sample bound, Theorem 1): The claimed decomposition into three independently controllable terms requires that the lifted AIS framework fully absorbs Markovian noise induced by random option durations so that no residual correlation appears between the interface representation gap and the mixing-time residual. The provided derivation steps do not explicitly verify this independence under stochastic handoff times; if such dependence remains, the three-term separation fails.
Authors: We thank the referee for highlighting this aspect of the decomposition. The random option-duration discount is introduced precisely to ensure that stochastic handoff times induce Markovian noise that is absorbed entirely into the mixing-time residual term once the AIS is lifted; under this discount the interface state remains a sufficient statistic, so that cross terms between the interface representation gap and the mixing-time residual are zero. While the current derivation relies on this property, we agree that an explicit verification step would strengthen the presentation. In the revision we will insert a supporting lemma immediately preceding Theorem 1 that bounds any potential cross-covariance to zero under the random-duration assumption. revision: yes
-
Referee: [§3.2 (AIS lifting)] §3.2 (AIS lifting): The extension of the approximate information state from single-agent MDPs to multi-agent IC-SMDPs must ensure the local observation of the shared artifact remains a sufficient statistic when handoffs occur at random durations. The manuscript states this lifting has not been done previously, yet the precise assumptions on the duration distribution and the resulting Markovian noise control are not shown in sufficient detail to confirm sufficiency.
Authors: We agree that the assumptions on the duration distribution and the resulting noise control deserve a more explicit treatment to confirm sufficiency of the local observation. The lifting proceeds by showing that, under the random option-duration discount and standard moment conditions on the duration random variable (finite mean and independence from the artifact process), the local function of the shared artifact together with the private state forms an approximate information state at each decision epoch. In the revision we will expand §3.2 with a dedicated paragraph stating these assumptions and a short derivation verifying that the local observation remains sufficient when handoffs occur at random times. revision: yes
Circularity Check
Derivation self-contained; no reduction to inputs by construction
full rationale
The paper derives a finite-sample bound for neural IC-Q by lifting the AIS framework to multi-agent IC-SMDPs and controlling Markovian noise under random option durations, then decomposing the bound into three separately controllable terms (neural approximation error, interface gap, mixing residual). The abstract and description explicitly present this lifting as novel and previously undone, with no indication that any term is defined via a fitted parameter from the target bound, a self-citation chain, or an ansatz smuggled from prior author work. Experiments are described as validating the bound term-by-term on a synthetic IC-SMDP, confirming the derivation stands on its stated assumptions rather than reducing to its own inputs.
Axiom & Free-Parameter Ledger
axioms (1)
- domain assumption Standard technical conditions for finite-sample Q-learning bounds hold after lifting to the IC-SMDP setting
invented entities (2)
-
IC-SMDP
no independent evidence
-
IC-Q
no independent evidence
Lean theorems connected to this paper
-
IndisputableMonolith/Cost/FunctionalEquation.leanwashburn_uniqueness_aczel unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
finite-sample bound ... decomposes into three independently controllable error sources: neural function-approximation error, interface representation gap, and a mixing-time residual, under the random option-duration discount
-
IndisputableMonolith/Foundation/ArithmeticFromLogic.leanLogicNat ≃ Nat recovery unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
lifting the approximate information state (AIS) framework from single-agent primitive-step MDPs to multi-agent SMDPs
What do these tags mean?
- matches
- The paper's claim is directly supported by a theorem in the formal canon.
- supports
- The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
- extends
- The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
- uses
- The paper appears to rely on the theorem as machinery.
- contradicts
- The paper's claim conflicts with a theorem or certificate in the canon.
- unclear
- Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.
Reference graph
Works this paper leans on
-
[1]
Introducing the Model Context Protocol
Anthropic. Introducing the Model Context Protocol. https://www.anthropic.com/news/ model-context-protocol, 2024
work page 2024
-
[2]
The option-critic architecture
Pierre-Luc Bacon, Jean Harb, and Doina Precup. The option-critic architecture. InProceedings of the AAAI Conference on Artificial Intelligence, 2017
work page 2017
-
[3]
Bernstein, Robert Givan, Neil Immerman, and Shlomo Zilberstein
Daniel S. Bernstein, Robert Givan, Neil Immerman, and Shlomo Zilberstein. The complexity of decentralized control of Markov decision processes.Mathematics of Operations Research, 27(4):819–840, 2002
work page 2002
-
[4]
A finite time analysis of temporal difference learning with linear function approximation
Jalaj Bhandari, Daniel Russo, and Raghav Singal. A finite time analysis of temporal difference learning with linear function approximation. InProceedings of the 31st Conference on Learning Theory, volume 75 ofProceedings of Machine Learning Research, pages 1691–1692. PMLR, 2018
work page 2018
-
[5]
Steven J. Bradtke and Michael O. Duff. Reinforcement learning methods for continuous-time Markov decision problems. InAdvances in Neural Information Processing Systems (NeurIPS), 1994
work page 1994
-
[6]
Qi Cai, Zhuoran Yang, Jason D. Lee, and Zhaoran Wang. Neural temporal difference and Q learning provably converge to global optima.Mathematics of Operations Research, 49(1):619– 651, 2023
work page 2023
-
[7]
Jinhang Chai, Elynn Chen, and Jianqing Fan. Deep transfer q-learning for offline non-stationary reinforcement learning.arXiv preprint arXiv:2501.04870, 2025
-
[8]
Transfer Q-learning with composite MDP structures
Jinhang Chai, Elynn Chen, and Lin Yang. Transfer Q-learning with composite MDP structures. InProceedings of the 42nd International Conference on Machine Learning (ICML), volume 267 ofProceedings of Machine Learning Research, pages 7089–7106. PMLR, 2025
work page 2025
-
[9]
Optimistic transfer under task shift via Bellman alignment.arXiv preprint arXiv:2601.21924, 2026
Jinhang Chai, Enpei Zhang, Elynn Chen, and Yujun Yan. Optimistic transfer under task shift via Bellman alignment.arXiv preprint arXiv:2601.21924, 2026
-
[10]
Data-driven knowledge transfer in batch q˚ learning
Elynn Chen, Xi Chen, and Wenbo Jing. Data-driven knowledge transfer in batch q˚ learning. Journal of the American Statistical Association, 2026. Accepted; published online 05 Jan 2026
work page 2026
-
[11]
Elynn Chen, Xi Chen, Wenbo Jing, and Xiao Liu. High-dimensional linear bandits under stochastic latent heterogeneity.arXiv preprint arXiv:2502.00423, 2025
-
[12]
Elynn Chen, Xi Chen, and Yi Zhang. Transfer learning for contextual joint assortment-pricing under cross-market heterogeneity.arXiv preprint arXiv:2603.18114, 2026
-
[13]
Elynn Chen, Sai Li, and Michael I. Jordan. Transfer Q-learning for finite-horizon Markov decision processes.Electronic Journal of Statistics, 19(2):5289–5312, 2025
work page 2025
-
[14]
Elynn Chen, Rui Song, and Michael I. Jordan. Reinforcement learning in latent heterogeneous environments.Journal of the American Statistical Association, 119(548):3113–3126, 2024
work page 2024
-
[15]
arXiv preprint arXiv:2411.05451 , year=
Shengda Fan, Xin Cong, Yuepeng Fu, Zhong Zhang, Shuyan Zhang, Yuanwei Liu, Yesai Wu, Yankai Lin, Zhiyuan Liu, and Maosong Sun. WorkflowLLM: Enhancing workflow orchestration capability of large language models.arXiv preprint arXiv:2411.05451, 2024
-
[16]
Counterfactual multi-agent policy gradients
Jakob Foerster, Gregory Farquhar, Triantafyllos Afouras, Nantas Nardelli, and Shimon Whiteson. Counterfactual multi-agent policy gradients. InProceedings of the AAAI Conference on Artificial Intelligence, 2018
work page 2018
-
[17]
Agent2Agent (A2A) protocol specification, 2025
Google. Agent2Agent (A2A) protocol specification, 2025
work page 2025
-
[18]
Juraj Gottweis, Wei-Hung Weng, Alexander Daryin, Tao Tu, Anil Palepu, Petar Sirkovic, Artiom Myaskovsky, Felix Weissenberger, Keran Rong, Ryutaro Tanno, et al. Towards an AI co-scientist.arXiv preprint arXiv:2502.18864, 2025. 11
work page internal anchor Pith review Pith/arXiv arXiv 2025
-
[19]
MetaGPT: Meta Programming for A Multi-Agent Collaborative Framework
Sirui Hong, Xiawu Zheng, Jonathan Chen, Yuheng Cheng, Jinlin Wang, Ceyao Zhang, Zili Wang, Steven Ka Shing Yau, Zijuan Lin, Liyang Zhou, et al. MetaGPT: Meta programming for multi-agent collaborative framework.arXiv preprint arXiv:2308.00352, 2023. Cited as Hong et al., 2024 per ICLR publication
work page internal anchor Pith review Pith/arXiv arXiv 2023
-
[20]
Automated Design of Agentic Systems
Shengran Hu, Cong Lu, and Jeff Clune. Automated design of agentic systems.arXiv preprint arXiv:2408.08435, 2024
work page internal anchor Pith review Pith/arXiv arXiv 2024
-
[21]
AgentCoder: Multi-Agent-based Code Generation with Iterative Testing and Optimisation
Dong Huang, Qingwen Bu, Jie M. Zhang, Michael Luck, and Heming Cui. AgentCoder: Multi-agent-based code generation with iterative testing and optimisation.arXiv preprint arXiv:2312.13010, 2023
work page internal anchor Pith review Pith/arXiv arXiv 2023
-
[22]
Actor-attention-critic for multi-agent reinforcement learning
Shariq Iqbal and Fei Sha. Actor-attention-critic for multi-agent reinforcement learning. In Proceedings of the 36th International Conference on Machine Learning (ICML), volume 97 of Proceedings of Machine Learning Research, pages 2961–2970. PMLR, 2019
work page 2019
-
[23]
Common information based approximate state representations in multi-agent reinforcement learning
Hsu Kao and Vijay Subramanian. Common information based approximate state representations in multi-agent reinforcement learning. InArtificial Intelligence and Statistics (AISTATS), 2022
work page 2022
-
[24]
Ali Devran Kara and Serdar Yüksel. Convergence of finite memory Q-learning for POMDPs and near optimality of learned policies under filter stability.Mathematics of Operations Research, 48(4):2066–2093, 2022
work page 2066
-
[25]
Wu, Aviv Tamar, Jean Harb, Pieter Abbeel, and Igor Mordatch
Ryan Lowe, Yi I. Wu, Aviv Tamar, Jean Harb, Pieter Abbeel, and Igor Mordatch. Multi-agent actor-critic for mixed cooperative-competitive environments. InAdvances in Neural Information Processing Systems (NeurIPS), 2017
work page 2017
-
[26]
Networked distributed POMDPs: A synthesis of distributed constraint optimization and POMDPs
Ranjit Nair, Pradeep Varakantham, Milind Tambe, and Makoto Yokoo. Networked distributed POMDPs: A synthesis of distributed constraint optimization and POMDPs. InProceedings of the 20th National Conference on Artificial Intelligence (AAAI), pages 133–139, 2005
work page 2005
-
[27]
Oliehoek and Christopher Amato.A Concise Introduction to Decentralized POMDPs
Frans A. Oliehoek and Christopher Amato.A Concise Introduction to Decentralized POMDPs. Springer, 2016
work page 2016
-
[28]
Frans A. Oliehoek, Matthijs T. J. Spaan, Shimon Whiteson, and Nikos Vlassis. Exploiting locality of interaction in factored Dec-POMDPs. InProceedings of the 7th International Joint Conference on Autonomous Agents and Multiagent Systems (AAMAS), pages 517–524, 2008
work page 2008
-
[29]
PhD thesis, University of Massachusetts Amherst, 2000
Doina Precup.Temporal Abstraction in Reinforcement Learning. PhD thesis, University of Massachusetts Amherst, 2000
work page 2000
-
[30]
Tabish Rashid, Mikayel Samvelyan, Christian Schroeder De Witt, Gregory Farquhar, Jakob Foerster, and Shimon Whiteson. Monotonic value function factorisation for deep multi-agent reinforcement learning.Journal of Machine Learning Research, 21(178):1–51, 2020
work page 2020
-
[31]
Periodic agent-state based Q-learning for POMDPs
Amit Sinha, Matthieu Geist, and Aditya Mahajan. Periodic agent-state based Q-learning for POMDPs. InAdvances in Neural Information Processing Systems (NeurIPS), 2024
work page 2024
-
[32]
Agent-state based policies in POMDPs: Beyond belief-state MDPs
Amit Sinha and Aditya Mahajan. Agent-state based policies in POMDPs: Beyond belief-state MDPs. InIEEE Conference on Decision and Control (CDC), 2024
work page 2024
-
[33]
Difficulty-aware agentic orchestration for query-specific multi-agent workflows
Jinwei Su, Qizhen Lan, Yinghui Xia, Lifan Sun, Weiyou Tian, Tianyu Shi, and Lewei He. Difficulty-aware agentic orchestration for query-specific multi-agent workflows. pages 2060– 2070, 2026
work page 2060
-
[34]
Jayakumar Subramanian, Amit Sinha, Raihan Seraj, and Aditya Mahajan. Approximate information state for approximate planning and reinforcement learning in partially observed systems.Journal of Machine Learning Research, 23(12):1–83, 2022. arXiv:2010.08843
-
[35]
Peter Sunehag, Guy Lever, Audrunas Gruslys, Wojciech Marian Czarnecki, Vinicius Zambaldi, Max Jaderberg, Marc Lanctot, Nicolas Sonnerat, Joel Z. Leibo, Karl Tuyls, et al. Value- decomposition networks for cooperative multi-agent learning based on team reward. InAu- tonomous Agents and Multi-Agent Systems (AAMAS), 2018. 12
work page 2018
-
[36]
Sutton, Doina Precup, and Satinder Singh
Richard S. Sutton, Doina Precup, and Satinder Singh. Between MDPs and semi-MDPs: A framework for temporal abstraction in reinforcement learning.Artificial Intelligence, 112(1– 2):181–211, 1999
work page 1999
-
[37]
AutoGen: Enabling Next-Gen LLM Applications via Multi-Agent Conversation
Qingyun Wu, Gagan Bansal, Jieyu Zhang, Yiran Wu, Beibin Li, Erkang Zhu, Li Jiang, Xiaoyun Zhang, Shaokun Zhang, Jiale Liu, Ahmed Hassan Awadallah, Ryen W. White, Doug Burger, and Chi Wang. AutoGen: Enabling next-gen LLM applications via multi-agent conversation. arXiv preprint arXiv:2308.08155, 2023
work page internal anchor Pith review Pith/arXiv arXiv 2023
-
[38]
A finite-time analysis of q-learning with neural network function approximation
Pan Xu and Quanquan Gu. A finite-time analysis of q-learning with neural network function approximation. InProceedings of the 37th International Conference on Machine Learning, volume 119 ofProceedings of Machine Learning Research, pages 10555–10565. PMLR, 2020
work page 2020
-
[39]
Yingxuan Yang, Huacan Chai, Shuai Shao, Yuanyi Song, Siyuan Qi, Renting Rui, and Weinan Zhang. AgentNet: Decentralized evolutionary coordination for LLM-based multi-agent systems. InAdvances in Neural Information Processing Systems (NeurIPS), 2025. arXiv:2504.00587
-
[40]
Shunyu Yao, Jeffrey Zhao, Dian Yu, Nan Du, Izhak Shafran, Karthik Narasimhan, and Yuan Cao. ReAct: Synergizing reasoning and acting in language models.International Conference on Learning Representations (ICLR), 2023
work page 2023
-
[41]
AFlow: Automating Agentic Workflow Generation
Jiayi Zhang, Jinyu Xiang, Zhaoyang Yu, Fengwei Teng, Xiongwei Chen, Jiaqi Chen, Mingchen Zhuge, Xin Cheng, Sirui Hong, Jinlin Wang, et al. AFlow: Automating agentic workflow genera- tion. InInternational Conference on Learning Representations (ICLR), 2025. arXiv:2410.10762
work page internal anchor Pith review Pith/arXiv arXiv 2025
-
[42]
Transfer faster, price smarter: Minimax dynamic pricing under cross-market preference shift
Yi Zhang, Elynn Chen, and Yujun Yan. Transfer faster, price smarter: Minimax dynamic pricing under cross-market preference shift. InAdvances in Neural Information Processing Systems (NeurIPS), 2025. Spotlight; arXiv:2505.17203
-
[43]
Runlin Zhou, Chixiang Chen, and Elynn Chen. Prior-aligned meta-RL: Thompson sampling with learned priors and guarantees in finite-horizon MDPs.arXiv preprint arXiv:2510.05446, 2025
-
[44]
GPTSwarm: Language agents as optimizable graphs
Mingchen Zhuge, Wenyi Wang, Louis Kirsch, Francesco Faccio, Dmitrii Khizbullin, and Jürgen Schmidhuber. GPTSwarm: Language agents as optimizable graphs. InProceedings of the 41st International Conference on Machine Learning (ICML), 2024. 13
work page 2024
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.