REVIEW 4 major objections 4 minor 8 references
The paper argues that goal-directedness in an LLM agent requires both behavioural evaluation and probing of internal representations, and shows the agent encodes a coarse cognitive map and plans, with reasoning shifting from spatial cues to
Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →
T0 review · deepseek-v4-flash
2026-08-03 03:04 UTC pith:NRPU7DSD
load-bearing objection Solid behavioral package, real methodological novelty, but the representational claims are not yet secured: the probing section needs basic controls before the cognitive-map story holds. the 4 major comments →
A Behavioural and Representational Evaluation of Goal-Directedness in Language Model Agents
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The central claim is that the LLM agent non-linearly encodes a coarse spatial map of the environment, preserving approximate task-relevant cues about its position and the goal location; that its actions are broadly consistent with these internal representations; and that reasoning reorganises them, shifting from broader environment structural cues toward information supporting immediate action selection. Decoding cell identities with an MLP probe reaches about 70% accuracy versus about 39% for a linear probe, showing the encoding is non-linear. Goal and agent positions are localised with high recall but blurred precision, and goal-distance is decodable with a mean absolute error of roughly t
What carries the argument
Two central objects carry the argument. The first is the cognitive-map probe: an MLP classifier that, given a residual-stream activation and the (x,y) coordinates of a queried cell, predicts the cell type (agent, goal, wall, open, padding), allowing reconstruction of the model's decoded belief over the grid state. The second is a one-shot plan decoder: a Transformer decoder that predicts an entire T-step action sequence simultaneously from a fixed set of token activations, without autoregressive conditioning, ensuring that any recovered multi-step structure must already be present in the model's representations rather than manufactured by the probe's own inference. The behavioural component
Load-bearing premise
The cognitive-map and consistency claims assume that probes trained on ground-truth labels with (x,y) coordinate conditioning recover the model's internal beliefs, rather than exploiting shortcuts such as the grid text literally present in the input, coordinate priors, or probe capacity; no control probes or ablations removing the coordinate conditioning are reported.
What would settle it
Train the same probe on activations collected from grids where the goal and agent characters are replaced by neutral symbols (or on random feature vectors with identical coordinate conditioning); if per-class accuracy stays well above chance and localisation precision persists, the internal-map claim collapses. A simpler control: remove the (x,y) coordinate input from the probe and check whether accuracy drops to chance; if it does not, the coordinates are the carrier.
If this is right
- The agent's performance scales with grid size and obstacle density and is robust to difficulty-preserving transformations, indicating that navigation behaviour is driven by task-relevant structure rather than incidental grid configurations.
- The agent reliably solves instrumental key-door subtasks but is systematically attracted to goal-like reward-irrelevant objects, detouring toward a useless key in 75% of non-optimal actions and favouring the key-containing path in 67.3% of two-path trials.
- Probes decode a coarse non-linear cognitive map of the environment from hidden activations, with approximate but localisable agent and goal positions, supporting the claim that goal-relevant spatial beliefs are carried in the model's internal state.
- Actions are broadly consistent with decoded beliefs: agreement between the ground-truth-optimal policy and the decoded-map-optimal policy averages about 84%, and a substantial share of suboptimal actions are optimal with respect to the agent's own faulty map, attributing many failures to fuzzy world representations rather than to a lack of goal-directedness.
- Reasoning re-weights internal representations: pre-reasoning activations support longer-horizon plan decoding (e.g., 13% vs 9% prefix accuracy at N=4), while post-reasoning activations boost next-step decodability (53.9% vs 40.3% at N=1), indicating a shift from environment-structural cues to immediate action selection.
Where Pith is reading between the lines
- If the probes are reliable, this framework offers a way to adjudicate capability failure versus goal-directedness failure in real deployments: an agent that acts optimally with respect to its decoded beliefs but poorly relative to the environment is rational given a faulty model, which changes how one should intervene.
- The key-attraction bias suggests a general phenomenon: LLM agents may treat semantically salient objects from pretraining as goal-relevant even when the current task specification says otherwise; this could be tested in more naturalistic environments with arbitrary distractor objects.
- The pre- and post-reasoning representational shift implies that reasoning partly acts as a compression from world-model to policy features. A testable extension is to vary reasoning effort and measure whether the crossing point in plan decodability moves, predicting that higher reasoning effort compresses spatial cues more aggressively.
- The coarse, blurred localisation (high recall, low precision) mirrors place-field-like uncertainty in biological navigation; one could test whether the decoded map's uncertainty correlates with the agent's behavioural entropy or distance-to-goal, connecting the representation to calibration of internal beliefs.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper proposes a framework that combines behavioural evaluation with representation probing to assess goal-directedness of an LLM agent in a grid-world navigation task. Behaviourally, it compares the agent's actions to A*-optimal policies across grid sizes, obstacle densities, iso-difficulty transformations, and instrumental/implicit-goal variants. Representationally, it trains linear and MLP probes on last-token activations, augmented with queried-cell (x, y) coordinates, to decode cell types ('cognitive maps'); it then checks whether the agent's actions are optimal with respect to its decoded map, and trains a one-shot transformer decoder to read multi-step action plans from activations. The paper concludes that the agent non-linearly encodes a coarse spatial map preserving task-relevant cues, that its actions are broadly consistent with this map, and that reasoning reorganises representations from broader spatial/long-horizon information toward immediate action selection. The authors argue that these findings support the need for introspective, representation-based evaluation beyond behaviour.
Significance. If the representational results were secured, the paper would make a useful contribution to goal-directedness evaluation: the behavioural protocols are carefully designed, the iso-difficulty and instrumental-goal experiments are informative, the Wilcoxon signed-rank tests are appropriate, and the one-shot plan decoder is a thoughtful attempt to avoid probe-created autoregressive structure. The behavioural findings—especially the attraction to a reward-irrelevant key and robustness to iso-difficulty transformations—are credible and interesting. However, the paper's central novelty, the claim that internal representations add information beyond behaviour, rests on probe results that currently lack essential controls. The cognitive-map probes are trained on activations from a model that literally sees the full grid text, yet no baselines are given for coordinate-prior, input-copy, or majority-class shortcuts. The plan-decoder comparison is only against random guessing. Consequently, the significance is conditional on the representational claims surviving appropriate controls.
major comments (4)
- [§5.1] The cognitive-map probe is trained by concatenating activations with (x, y) coordinate features, and the model's input context contains the full grid text. No control probes are reported. For small grids padded to 15×15, the padding class covers 176/225 ≈ 78% of cells for a 7×7 grid, so a trivial all-padding predictor already achieves ~78% accuracy; the reported ~70% overall accuracy is therefore uninterpretable without a per-size majority baseline. More broadly, high accuracy could reflect coordinate-prior or input-copy shortcuts rather than an internal 'belief' or 'cognitive map.' The authors should add: majority-class baselines per grid size, coordinate-only probes, probes on random/shuffled activations, and an ablation that hides or scrambles the grid input. This is required to support the abstract's claim of a non-linear coarse spatial map.
- [§5.1–§5.3] It is never stated whether probe training and test examples are split by grid instance. If activations from the same grid configuration appear in both training and test sets, the probe can memorize grid-specific features, inflating all decoding accuracies and the §5.2 policy-consistency metrics. Please state the instance-level split; if none exists, rerun with disjoint grids.
- [§5.2] The Recovery metric and the conclusion that 'a substantial fraction of failures can be attributed to inaccurate, or fuzzy world representations' assume that the decoded grid is a valid estimate of the agent's internal beliefs. Because the probe lacks the controls above and is trained on ground-truth labels from the same observably available grid, the decoded map may simply mirror the input text. The Rec. metric then measures consistency with the input, not with internal beliefs. The authors need an independent validation of the probe (e.g., intervention on the decoded map, or consistency under input perturbations that change the ground truth) before this conclusion can be drawn.
- [§5.3] Plan decoding is only compared against random chance (0.25^N). Since the target action sequence is the executed trajectory of the same model, and the full grid is in the prompt, a probe could achieve above-random prefix accuracy by learning a direct input-to-action policy rather than decoding a multi-step plan. The one-shot decoder rules out autoregressive shortcuts, but not this input-copy shortcut. Please add a control using activations from a model that never received the grid, or from representations where the grid text is permuted, and report whether prefix accuracy above baseline persists.
minor comments (4)
- [§4.2] Table 3 reports eight Wilcoxon signed-rank tests without correction for multiple comparisons. Adjusting p-values or reporting them as exploratory would help; the reported effect sizes are appreciated.
- [Fig. 6] No confidence intervals or significance tests are reported for probe accuracy differences (e.g., MLP vs. linear, 7×7 vs. 11×11). Given the small number of grids, bootstrap confidence intervals would be appropriate.
- [App. A] Appendix A describes planned partially-observable experiments in the present/future tense ('we evaluate...', 'we ideally are able...') but these were not carried out. Please mark this clearly as a proposal rather than completed analysis.
- [§5.2, footnote 6] The footnote acknowledges that decoded maps may reflect multiple nearby cells rather than a single location. This undercuts the single-cell decoding used for Acc-Dec and Rec. Consider deriving a distribution over policies to account for the probe's uncertainty.
Circularity Check
No significant circularity: the paper's claims are empirical measurements with separate train/test splits and independently recomputed optimal policies.
full rationale
The paper is an empirical evaluation rather than a derivation chain, and I found no step where a predicted quantity reduces by construction to a fitted input or to a self-citation. Behavioural metrics (§4) are computed by comparing GPT-OSS-20B's actions to A*-derived optimal policies on the same grids; these are measurements, not predictions fitted to the conclusion. The cognitive-map probes (§5.1) are trained on ground-truth cell labels from a train/test split, and the 'decoded cognitive maps' are then used in §5.2 to recompute optimal policies with A* independently of the agent's actions, so the 'actions are broadly consistent with internal representations' claim is a measured correlation rather than an identity. The plan decoder (§5.3) is trained on held-out executed trajectories, uses one-shot decoding to prevent the probe itself from constructing plan structure autoregressively, and is compared against a 0.25^N random baseline; no equation in the paper equates the decoded plan to the training labels by construction. The references to prior probing work (Li et al. 2023; Nanda et al. 2023; Gurnee & Tegmark 2024) are external evidence and are not load-bearing self-citations; I found no uniqueness theorem or ansatz smuggled in via the authors' own prior work. The coordinate-augmented probing procedure could in principle allow the probe to exploit coordinate priors or a near-literal copy of the grid text in the input context, and the absence of control probes is a legitimate validity and robustness concern; however, that is a correctness/experimental-control issue, not circularity under the criteria here. The paper itself acknowledges that establishing causal links is future work, which further supports treating the representational findings as empirical rather than definitional.
Axiom & Free-Parameter Ledger
free parameters (5)
- Horizon cap factor c=1.5 =
1.5 × optimal path length L
- Reasoning effort =
low
- Probe layers =
{7, 15, 23}
- Plan decoding horizon T =
10
- Probe hidden dimension =
1024
axioms (5)
- standard math A* with Manhattan distance yields an optimal policy in a 4-directional grid world with obstacles.
- domain assumption The text-grid representation gives the LLM full observability of the true state, so a ground-truth optimal policy is computable and belief updating is unnecessary.
- domain assumption Residual-stream activations at a few chat-template tokens are a sufficient substrate for probing the model's environment representations and plans.
- domain assumption Iso-difficulty transformations preserve task difficulty (optimal path length), so any behavioral difference is attributable to task-irrelevant grid configuration.
- domain assumption Supervised probing with coordinate-conditioned inputs recovers the model's internal 'beliefs' rather than probe artifacts or input-text leakage.
read the original abstract
Understanding an agent's goals helps explain and predict its behaviour, yet there is no established methodology for reliably attributing goals to agentic systems. We propose a framework for evaluating goal-directedness that integrates behavioural evaluation with interpretability-based analyses of models' internal representations. As a case study, we examine an LLM agent navigating a 2D grid world towards a goal state. Behaviourally, we evaluate the agent against optimal policies across varying grid sizes, obstacle densities, and goal structures, finding that performance scales with task difficulty while remaining robust to difficulty-preserving transformations and multi-goal structures. We then use probing methods to decode internal representations of the environment and multi-step action plans. We find that the LLM agent non-linearly encodes a coarse spatial map, preserving approximate task-relevant cues about its position and the goal location; that its actions are broadly consistent with these internal representations; and that reasoning reorganises them, shifting from spatial cues towards immediate action selection. Our findings support the view that introspective examination is required beyond behavioural evaluations to characterise how agents represent and pursue their objectives.
Figures
Reference graph
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discussion (0)
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