EnvRL: Learn from Environment Dynamics in Agentic Reinforcement Learning
Pith reviewed 2026-06-27 01:23 UTC · model grok-4.3
The pith
EnvRL adds state prediction and inverse dynamics objectives to agentic RL so agents internalize environment transitions from their own interaction trajectories.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The paper claims that interaction experience inherently reveals the underlying transition mechanisms of the environment. By jointly optimizing state-prediction and inverse-dynamics objectives with the primary RL objective, the agent constructs a more accurate internal model of the environment from its own rollout data, which improves policy learning and produces higher success rates on long-horizon agentic tasks.
What carries the argument
Two auxiliary objectives—state prediction (forecasting future states from history) and inverse dynamics (recovering actions from observed state transitions)—optimized jointly with the RL loss to drive internalization of environment dynamics.
If this is right
- When combined with GRPO, EnvRL raises Qwen-2.5-1.5B-Instruct success from 72.8% to 77.4% on ALFWorld.
- The same training raises success from 56.8% to 67.0% on WebShop.
- The approach applies to any RL method for agentic tasks that can access full interaction trajectories.
Where Pith is reading between the lines
- Similar auxiliary objectives could be added to other model-free RL setups to extract more signal per rollout without requiring extra environment steps.
- The method offers a lightweight bridge toward model-based ideas by shaping the policy's internal representations rather than training a separate dynamics model.
- One could measure whether the quality of the learned state predictions correlates with downstream planning or generalization behavior in the agent.
Load-bearing premise
The observed success-rate gains are produced by the agent learning accurate environment transition models rather than by the extra loss terms acting as generic regularizers or optimization aids.
What would settle it
Train identical models with the auxiliary objectives but replace the true next-state and inverse-action targets with randomly shuffled or noise targets; if the success-rate improvements over RL-only baselines disappear, the central claim is supported.
Figures
read the original abstract
Reinforcement learning (RL) has emerged as a powerful paradigm for training Large Language Models (LLMs) as agents. However, conventional RL methods for long-horizon agentic tasks often struggle with sparse outcome rewards. Intuitively, this overlooks the rich environment dynamics information contained in rollout interaction trajectories. We argue that the interaction experience inherently serves as an implicit supervision signal, reveals the underlying transition mechanisms of the environment, and enables the agent to construct a more accurate internal model of the environment.. Therefore, in this work, we investigate how to leverage this additional signal to improve policy learning. Specifically, we propose EnvRL, a framework that incorporates environment dynamics learning into agentic RL via two auxiliary objectives: state prediction and inverse dynamics. By jointly optimizing with the primary RL objective, we encourage the agent to internalize environment dynamics from its own interaction experience. Extensive experiments on two long-horizon agentic benchmarks demonstrate that EnvRL achieves significant improvements on success-rates over RL-only baselines, e.g., when trained with GRPO, lifting Qwen-2.5-1.5B-Instruct from 72.8% to 77.4% on ALFWorld, and from 56.8% to 67.0% on WebShop.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper introduces EnvRL, which augments agentic RL (e.g., GRPO) for LLMs with two auxiliary objectives—state prediction and inverse dynamics—derived from rollout trajectories. It argues that jointly optimizing these with the primary RL loss encourages internalization of environment dynamics, yielding higher success rates on long-horizon tasks. Experiments on ALFWorld and WebShop report gains such as lifting Qwen-2.5-1.5B-Instruct from 72.8% to 77.4% on ALFWorld and 56.8% to 67.0% on WebShop under GRPO.
Significance. If the gains are shown to arise specifically from improved dynamics modeling rather than generic auxiliary-loss effects, the framework would supply a lightweight, data-efficient way to exploit interaction trajectories in sparse-reward agentic settings. The concrete numerical improvements on two established benchmarks constitute a clear empirical contribution, though the causal mechanism requires further isolation to strengthen the central claim.
major comments (3)
- [Experiments] Experiments section: the reported success-rate lifts are shown only versus RL-only baselines; no ablation with non-dynamics auxiliary objectives (e.g., random-target prediction or unrelated heads) is presented to isolate whether gains stem from environment-dynamics internalization or from incidental regularization, gradient diversity, or multi-task effects.
- [§4] §4 (results tables): success rates are given as single point estimates (e.g., 72.8% → 77.4%, 56.8% → 67.0%) with no standard deviations, number of independent runs, or statistical significance tests, preventing assessment of whether the differences are reliable.
- [Method] Method section: the weighting coefficients λ_state and λ_inv between the RL loss and the two auxiliary losses are not specified, nor is any sensitivity analysis or hyper-parameter sweep reported, which bears directly on reproducibility of the joint-optimization claim.
minor comments (2)
- [Abstract] Abstract: the term 'significant improvements' is used without reference to the tables or statistical support; consider qualifying it as 'empirical' or citing the specific results.
- Notation: the precise formulation of the state-prediction and inverse-dynamics losses (e.g., whether they operate on token embeddings or full states) should be stated explicitly with equations for clarity.
Simulated Author's Rebuttal
We thank the referee for the constructive comments. We address each point below and will incorporate revisions to improve the manuscript.
read point-by-point responses
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Referee: [Experiments] Experiments section: the reported success-rate lifts are shown only versus RL-only baselines; no ablation with non-dynamics auxiliary objectives (e.g., random-target prediction or unrelated heads) is presented to isolate whether gains stem from environment-dynamics internalization or from incidental regularization, gradient diversity, or multi-task effects.
Authors: We agree that ablations with non-dynamics auxiliary objectives would provide stronger evidence for the specific benefit of dynamics learning. In the revised version, we will add experiments including a random prediction auxiliary task and an unrelated head to isolate the effect. revision: yes
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Referee: [§4] §4 (results tables): success rates are given as single point estimates (e.g., 72.8% → 77.4%, 56.8% → 67.0%) with no standard deviations, number of independent runs, or statistical significance tests, preventing assessment of whether the differences are reliable.
Authors: We acknowledge the importance of reporting statistical reliability. We will conduct additional runs with different random seeds, report mean success rates with standard deviations, and include significance tests in the updated results section. revision: yes
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Referee: [Method] Method section: the weighting coefficients λ_state and λ_inv between the RL loss and the two auxiliary losses are not specified, nor is any sensitivity analysis or hyper-parameter sweep reported, which bears directly on reproducibility of the joint-optimization claim.
Authors: The values of λ_state and λ_inv used in our experiments will be explicitly stated in the revised method section. Additionally, we will include a sensitivity analysis showing the impact of different weighting coefficients on performance. revision: yes
Circularity Check
No circularity; empirical framework with independent experimental claims
full rationale
The provided abstract and description contain no equations, fitted parameters presented as predictions, or self-citation chains. The method adds auxiliary state-prediction and inverse-dynamics losses to RL training and reports benchmark success-rate gains. These gains are not shown to reduce by construction to the inputs (no self-definitional re-use of the same quantities, no renaming of known results, no load-bearing uniqueness theorems). The derivation chain is therefore self-contained against external benchmarks and receives the default non-finding.
Axiom & Free-Parameter Ledger
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