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REVIEW 3 major objections 5 minor 293 references

Embodied Spatial Intelligence: from Implicit Scene Modeling to Spatial Reasoning

T0 review · 3 major / 5 minor · reviewed 2026-08-05 · deepseek-v4-flash

Pith's one-line read Robust 3D understanding is essential for embodied agents; inductive biases are learnable; text bridges perception to reasoning.

desk verdict A solid PhD thesis compiling six strong papers, but the headline 'practical path to embodied spatial intelligence' is a research agenda, not a demonstrated result. read the letter →

arxiv 2509.00465 v1 pith:63KKXPH5 submitted 2025-08-30 cs.RO cs.AIcs.CV

classification cs.ROcs.AIcs.CV
keywords embodiedspatialintelligenceimplicitneuralrepresentations3Dsceneunderstandinglargelanguagemodelsreasoningreferringexpressionresolutioncameraself-calibrationlong-horizonplanning
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This thesis defines embodied spatial intelligence as the ability to perceive a 3D world and act on it through natural language, decomposing it into a perception step that builds a 3D representation and an action step that reasons over it. It claims that the geometric inductive biases traditionally hard-coded into vision systems are largely learnable from data, and that implicit neural representations offer a robust, generalizable, and scalable way to build those 3D representations. On the reasoning side, it claims that large language models, though weak at mapping and navigation on their own, can be made spatially competent by transcribing 3D scenes into text, executing code for quantitative checks, and maintaining an explicit state summary during long tasks. If these claims hold, robots could recalibrate their cameras from raw video, transfer depth models across domains without retraining, fuse independently built maps, and follow complex language instructions in cluttered real environments.

What carries the argument

The thesis decomposes the action-perception mapping into V (perception from observations to a 3D representation) and F (from that representation to actions). It relies on implicit scene representations—continuous depth fields, neural radiance fields, and modular NeRF sub-maps—and on unified camera models with closed-form differentiable projection. For reasoning, it uses text as the unifying medium: detected objects are transcribed into structured descriptions, an LLM iterates with a Python interpreter for spatial calculations, and a second LLM maintains a concise state summary for long-horizon planning.

What would settle it

Take Transcrib3D to referring expressions that require exact metric distances or occlusion ordering, such as 'the cup at least 30 centimeters from the wall, behind the tall bottle,' and see if accuracy drops to chance while humans succeed; if so, the claim that transcribed text retains the geometry needed for spatial reasoning is falsified.

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Extended reading notes

Core claim

Robust 3D understanding is essential for embodied agents; many of the inductive biases needed for that understanding are learnable at scale; and a practical path toward embodied spatial intelligence lies in strategically integrating high-quality 3D structure with large-scale 2D foundation models, using text as a unifying medium. The thesis supports this with six results: sub-pixel self-calibration from raw video, a generalist depth network that transfers zero-shot, NeRF registration and blending, a benchmark showing LLM mapping gaps, 3D referring-expression resolution via transcribed scenes, and dual-LLM state-maintained planning.

Load-bearing premise

The load-bearing premise is that transcribing 3D scenes into text preserves enough geometric information for language-guided spatial tasks; the thesis itself concedes this transcription is lossy and may discard metric distances, occlusions, or fine orientations.

Editorial extensions

If this is right

  • Robots can recover from camera calibration drift on the fly using raw video and a self-supervised depth-and-pose objective.
  • Generalist transformer architectures with 3D data augmentation can replace hand-engineered geometric modules for depth estimation and still transfer across domains.
  • Large-scale environments can be represented as independently trained NeRFs, enabling distributed and privacy-preserving map building.
  • Language models show systematic gaps in mapping and navigation; providing explicit map information improves their downstream performance.
  • Transcribing 3D scenes into text with iterative code execution gives state-of-the-art 3D referring-expression resolution.
  • Maintaining an explicit world state via a second LLM improves long-horizon language-guided task execution.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If 3D inductive biases are genuinely learnable at scale, specialized modules like cost volumes and epipolar losses may become optional; a direct test is to scale a generalist transformer on more diverse 3D data and see if the gap closes.
  • The text-as-unifying-medium strategy has a measurable ceiling: construct referring expressions that require metric precision, occlusion reasoning, or fine orientation; if accuracy drops to chance, the claim that transcribed text retains geometry is falsified.
  • The dual-LLM state-maintenance idea likely extends to belief maintenance in partially observable environments, storing uncertainty and hypotheses rather than just past actions.
  • The MANGO result suggests that explicit memory or map modules, not just larger models, may be the missing piece for spatial reasoning in language models.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. The manuscript is a PhD thesis that defines Embodied Spatial Intelligence and decomposes the robot control mapping as M = F ∘ V (Eq. 1.2). Chapter 2 develops implicit 3D scene representations: self-supervised camera self-calibration, the DeFiNe depth-field network, and NeRFuser for NeRF registration and blending. Chapter 3 develops LLM-based spatial reasoning: the MANGO text-navigation benchmark, Transcrib3D for 3D referring-expression resolution via scene transcription, and Statler for state-maintaining long-horizon planning. The thesis-level claims in Section 1.3 are that (a) robust 3D understanding is essential, (b) many inductive biases are learnable at scale, and (c) a practical path lies in integrating high-quality 3D structure with large-scale 2D foundation models. Each chapter is a previously published work evaluated on external benchmarks, with ablations for key design choices.

Significance. If the thesis-level synthesis were established, this would be a useful integrative statement of a research program: the per-chapter contributions are individually strong, with concrete benchmark results, ablations (Table 2.7, Figures 2.20–2.22), and public code for NeRFuser and Transcrib3D, as well as a hosted benchmark for MANGO. The works have already received peer review in their original venues. However, the manuscript's own central claim is not demonstrated: the scene-representation and reasoning components are never composed. The thesis is honest about the lossy nature of 3D-to-text transcription, but it does not analyze the consequences of that loss. The result is a credible research agenda rather than a validated architectural thesis.

major comments (3)
  1. [Section 1.3, Chapters 2–3] The thesis-level claim (c) is never tested end-to-end. Chapter 2 modules are evaluated on self-calibration, depth estimation, and NeRF registration/blending benchmarks; Chapter 3 modules are evaluated on text-based navigation, 3D referring-expression, and pick-and-place benchmarks. No experiment feeds a Chapter 2 representation into a Chapter 3 reasoner. In particular, Transcrib3D (§3.2) consumes Mask3D detections and an LLM code interpreter, not DeFiNe or NeRFuser, and Statler (§3.3) uses an LLM state summary without Chapter 2 representations. Thus 'a practical path... strategically integrating high-quality 3D structure with large-scale 2D foundation models' is an assertion, not a demonstrated result. Either add a concrete integration experiment or explicitly recast (c) as a research agenda.
  2. [Chapter 3 introduction (p. 64)] The author acknowledges that 'transcribing 3D scenes into language is a form of lossy compression, potentially discarding geometric details crucial for certain tasks.' This caveat directly affects the Transcrib3D mechanism, which uses text as the unifying medium for 3D referring expression resolution and downstream pick-and-place (§3.2.5). The manuscript does not quantify which geometric details are lost or when they matter for the benchmark results in Table 3.2. A concrete fidelity analysis is needed: compare transcript-based reasoning against a variant with structured numeric 3D data, and characterize failure cases as semantic vs. geometric. Without this, the 'practical path' claim is vulnerable exactly where the author identifies the risk.
  3. [Section 3.1] MANGO is presented as evidence about LLMs' navigation and mapping abilities, and the thesis uses this to motivate the broader embodied-spatial-intelligence claim. However, the benchmark is text-only and the mazes are 2D projections of text-game graphs (Figure 3.1), not 3D environments. The results therefore support a narrower claim about textual graph navigation than about 3D spatial reasoning. The thesis should explicitly delimit MANGO's scope so that the per-chapter claims are not read as supporting the 3D-specific central claim more than they do.
minor comments (5)
  1. [Eq. (2.4b)] The definition of r² reads 'm2_x + m2_x'; presumably this should be m_x² + m_y².
  2. [§3.1.4.1] The sentence 'we used the same walkthrough prefixes and questions as GPT-3.5 for a fair comparison' is repeated verbatim in consecutive paragraphs.
  3. [Figure 3.6 caption] Typo: 'necessary to to follow' should be 'necessary to follow'.
  4. [Figure 3.16 caption] Typo: 'However, the the baseline Code-as-Policies' should read 'However, the baseline Code-as-Policies'.
  5. [Prompt 3.5] Typo: 'Dome Roomm' should be 'Dome Room'.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity found: each chapter's results are measured against external benchmarks or held-out data, and the untested central synthesis is a missing-support issue, not a circular derivation.

full rationale

I walked the claimed derivation chain chapter by chapter. Section 2.1 learns camera intrinsics by minimizing a photometric view-synthesis loss and then evaluates the resulting parameters against AprilTag/Basalt calibration and LiDAR-based depth (EuRoC, KITTI); the evaluation targets are external to the training objective, so the sub-pixel reprojection claim is not a fitted input renamed as a prediction. Section 2.2 (DeFiNe) is trained on ScanNet RGB-D and evaluated on held-out ScanNet, 7-Scenes, and virtual-camera projections; the novel-view ground truth is generated from sensor depth and available point clouds, not from DeFiNe's own output, so the zero-shot transfer and query-vs-projection comparisons are genuine generalization tests. Section 2.3 (NeRFuser) registers and blends pretrained NeRFs and checks against ground-truth RGB-D-fused point clouds and held-out imagery; the registration and blending metrics are not constructed from the method's own predictions. The LLM chapters (MANGO, Transcrib3D, Statler) are evaluated on external benchmarks (Jericho games, ReferIt3D, ScanRefer) and simulator/real-robot rollouts, and the LLM responses are not used to define the ground-truth labels. The thesis is compiled from the author's own prior papers, so self-citation is pervasive, but no load-bearing argument reduces to a self-citation chain: the cited works are independently benchmarked, and the strongest external supports (e.g., VGGT for learnable inductive biases) are not the author's own. The main weaknesses are evidentiary, not circular: Section 1.3's claim that a practical path lies in integrating 3D structure with 2D foundation models is never tested as an end-to-end composed system, and the Section 3 preface explicitly concedes that 'transcribing 3D scenes into language is a form of lossy compression, potentially discarding geometric details crucial for certain tasks.' These are limitations of support and correctness risk, not cases where an equation or prediction reduces by construction to its own input. Accordingly, no circular step is identified.

Assumptions & free parameters 5 free parameters · 5 assumptions · 0 invented entities

The thesis introduces a conceptual framing but no new physical entities. Its central claims rest on standard ML assumptions and several hand-chosen hyperparameters. The free parameters are typical for deep learning systems and are ablated in part, but they do contribute to the final benchmark numbers.

free parameters (5)
  • DeFiNe loss weights lambda_s, lambda_v = tuned (ablated in Table 2.7)
    Balance depth and view synthesis losses; chosen by hand, sensitivity shown in ablation.
  • DeFiNe augmentation noise scales sigma_v, sigma_t, sigma_r = e.g., sigma_v=0.25m used in Figure 2.11b
    Control the strength of 3D augmentations; tuned on validation.
  • NeRFuser blending rate gamma = 10 (Mission Bay)
    Governs IDW blending sharpness; ablated in Figure 2.22.
  • NeRFuser proximity threshold tau = 1.2
    Filters distant NeRFs in blending; chosen by hand.
  • NeRFuser distant accumulation distance d = 0.3
    Threshold for pose filtering; chosen by hand.
assumptions (5)
  • domain assumption The Unified Camera Model family (UCM/EUCM/DS) can represent the cameras considered (perspective, fisheye, catadioptric).
    Relies on Usenko et al. [1]; not derived in thesis, but needed for self-calibration validity.
  • domain assumption Input NeRFs are trained from poses that have been preprocessed in a standardized way (centered, rotated, up-aligned, scaled to [-1,1]).
    Stated in Section 2.3.3.1; necessary for pose sampling in NeRF registration. If not met, registration fails.
  • domain assumption LLMs can reason reliably over text transcripts of 3D scenes when given code execution tools and principles.
    Core to Transcrib3D and Statler; empirically tested but not guaranteed across all scenes.
  • domain assumption Mask3D object detector provides sufficient recall of objects relevant to referring expressions.
    Transcrib3D depends on the detector's output; if objects are missed, the referent may be absent.
  • standard math Standard backpropagation and Transformer architectures are taken as given.
    Used throughout; standard ML machinery.

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Cite this review

Pith. "Pith review of Embodied Spatial Intelligence: from Implicit Scene Modeling to Spatial Reasoning." pith.science (2026). https://pith.science/paper/63KKXPH5

@misc{pith2026250900465,
  author       = {Pith},
  title        = {Pith review of: Embodied Spatial Intelligence: from Implicit Scene Modeling to Spatial Reasoning},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/63KKXPH5}},
  note         = {Machine review of arXiv:2509.00465}
}
read the original abstract

This thesis introduces "Embodied Spatial Intelligence" to address the challenge of creating robots that can perceive and act in the real world based on natural language instructions. To bridge the gap between Large Language Models (LLMs) and physical embodiment, we present contributions on two fronts: scene representation and spatial reasoning. For perception, we develop robust, scalable, and accurate scene representations using implicit neural models, with contributions in self-supervised camera calibration, high-fidelity depth field generation, and large-scale reconstruction. For spatial reasoning, we enhance the spatial capabilities of LLMs by introducing a novel navigation benchmark, a method for grounding language in 3D, and a state-feedback mechanism to improve long-horizon decision-making. This work lays a foundation for robots that can robustly perceive their surroundings and intelligently act upon complex, language-based commands.

Figures

Figures reproduced from arXiv: 2509.00465 by the authors.

Figure 2.1
Figure 2.1. Our self-supervised self-calibration procedure can recover accurate parameters for a wide range of cameras using a structure-from-motion objective on raw videos (EuRoC dataset, top), enabling on-the-fly re-calibration and robustness to intrinsics perturbation (bottom). Camera calibration is integral to robotics and computer vision algorithms that seek to infer geometric properties of the scene from visual input stre… view at source ↗
Figure 2.2
Figure 2.2. Our self-supervised self-calibration architecture. We use gradients from the photometric loss to update the parameters of a unified camera model ( [PITH_FULL_IMAGE:figures/full_fig_p031_2_2.png] view at source ↗
Figure 2.3
Figure 2.3. The Unified Camera Model [1] used in our self-calibration pipeline. Points are projected onto a unit sphere before being projected onto an image plane of a standard pinhole camera offset by α 1−α from the sphere center. aforementioned view synthesis objective alone. At the start of self-supervised depth and pose training, rather than pre-calibrating the camera parameters, we initialize the camera with “default” valu… view at source ↗
Figures from the paper (41 more)
Figure 2.4
Figure 2.4. Figure 2.4: EuRoC rectification results using images from the calibration sequences. Each column visualizes the results rendered using (left) the Basalt calibrated intrinsics and (right) our learned intrinsics. The top row shows that detected (small circles) and reprojected (big…
Figure 2
Figure 2. Figure 2: , we see that our learned parameters allow for the rectified grid to [PITH_FULL_IMAGE:figures/full_fig_p035_2.png]
Figure 2.5
Figure 2.5. Figure 2.5: EuRoC perturbation test, showing how our proposed learning￾based method is able to recover from changes in camera parameters for online self-calibration. a camera based on a potentially incorrect prior calibration. Generally, this requires the capture of new calibrat…
Figure 2.6
Figure 2.6. Figure 2.6: Self-supervised monocular pointcloud for EuRoC, obtained by unprojecting predicted depth with our learned camera parameters (input image on the bottom right). lenging dataset that involves cluttered indoor sequences with six-DoF motion. Compared to the per-frame dist…
Figure 2.7
Figure 2.7. Figure 2.7: Qualitative depth estimation results on non-pinhole datasets with (a) fisheye and (b) catadioptric images. 2.1.5 Conclusion We proposed a procedure to self-calibrate a family of general camera models using self-supervised depth and pose estimation as a proxy task. We…
Figure 2.8
Figure 2.8. Figure 2.8: Our Depth Field Networks (DeFiNe) achieve state of the art in multi-view depth estimation, while also enabling predictions from arbitrary viewpoints. Modern 3D computer vision leverages learning to boost geometric reasoning, mapping image data to classical structures…
Figure 2.9
Figure 2.9. Figure 2.9: Overview of our proposed DeFiNe architecture, and the em￾beddings used to encode and decode information for depth and view synthesis. 2.2.3.1 Perceiver IO Perceiver IO [85] is a recent extension of the Perceiver [89] architecture. The Perceiver architecture alleviate…
Figure 2.10
Figure 2.10. Figure 2.10: Geometric augmentations. (a) Information from camera i is projected onto a virtual camera at Tv, creating additional supervision from other viewpoints. (b) Noise T ′ 0 is introduced to the canonical camera at T0, and then propagated to other cameras to preserve rela…
Figure 2.11
Figure 2.11. Figure 2.11: Depth estimation results on ScanNet-Stereo. (a) We outperform contemporary methods by a large margin. (b) Depth estimation results on virtual cameras using different values for σv at training and test time. use a custom split to select 2000 samples from 90 scenes no…
Figure 2.12
Figure 2.12. Figure 2.12: Reconstructed two-view pointclouds, from ScanNet-Stereo. DeFiNe pointclouds are generated using both depth maps and RGB images queried from our learned latent representation. GT DeFiNe GT DeFiNe [PITH_FULL_IMAGE:figures/full_fig_p055_2_12.png]
Figure 2.13
Figure 2.13. Figure 2.13: Depth estimation and view synthesis results on ScanNet. Although view synthesis is not our primary goal, it can be achieved with minimal modifications, and we show that it improves depth estimation performance. of traditional relative viewing rays; ( [PITH_FULL_IMA…
Figure 2.14
Figure 2.14. Figure 2.14: Depth estimation results from novel viewpoints. frames onto these new viewpoints. We evaluate both standard depth estimation networks [15, 68, 96] as well as DeFiNe itself, that can be used to either explicitly project information from encoded frames onto new viewpo…
Figure 2
Figure 2. Figure 2: reports results in terms of root mean squared error (RMSE) [PITH_FULL_IMAGE:figures/full_fig_p058_2.png]
Figure 2.15
Figure 2.15. Figure 2.15: Overall framework of NeRFuser We present NeRFuser , a novel framework that extends the representational capacity of neural radiance fields (NeRFs) to produce high-fidelity representa￾tions of large-scale scenes. Integral to our approach is the decomposition of spati…
Figure 2.16
Figure 2.16. Figure 2.16: Qualitative comparison of blending methods. Our proposed [PITH_FULL_IMAGE:figures/full_fig_p062_2_16.png]
Figure 2.17
Figure 2.17. Figure 2.17: Illustration of NeRF renderings and their accumulations. Column [PITH_FULL_IMAGE:figures/full_fig_p067_2_17.png]
Figure 2.18
Figure 2.18. Figure 2.18: Illustration of IDW-based blending methods: IDW-2D, IDW-3D [PITH_FULL_IMAGE:figures/full_fig_p069_2_18.png]
Figure 2.19
Figure 2.19. Figure 2.19: NeRF blending with IDW-based methods on the Mission Bay [PITH_FULL_IMAGE:figures/full_fig_p071_2_19.png]
Figure 2
Figure 2. Figure 2: , distant accumulation-based filtering removes mostly bad images [PITH_FULL_IMAGE:figures/full_fig_p073_2.png]
Figure 2.20
Figure 2.20. Figure 2.20: Registration error and time consumption against varying [PITH_FULL_IMAGE:figures/full_fig_p074_2_20.png]
Figure 2.21
Figure 2.21. Figure 2.21: Effect of re-rendering poses on NeRF registration. [PITH_FULL_IMAGE:figures/full_fig_p075_2_21.png]
Figure 2.22
Figure 2.22. Figure 2.22: Effect of blending rate γ in IDW-based blending. Ablation of γ in IDW-based blending We study the effect of blending rate γ in IDW-based blending on Object-Centric Indoor Scenes. Specifically, we use ground-truth transformations and set distance test ratio τ = 1.8. …
Figure 3.1
Figure 3.1. Figure 3.1: Map of Zork-I. Arrows denote the direction of travel during the [PITH_FULL_IMAGE:figures/full_fig_p080_3_1.png]
Figure 3.2
Figure 3.2. Figure 3.2: Success rates of the examined models on (a) DF and (b) RF [PITH_FULL_IMAGE:figures/full_fig_p089_3_2.png]
Figure 3
Figure 3. Figure 3: presents the success rates of all models. For each kind of question [PITH_FULL_IMAGE:figures/full_fig_p089_3.png]
Figure 3.3
Figure 3.3. Figure 3.3: Success rates of GPT-3.5 and GPT-4 broken down into individual [PITH_FULL_IMAGE:figures/full_fig_p091_3_3.png]
Figure 3.3
Figure 3.3. Figure 3.3: For example, both Zenon and OMNIQuest stay at the lower-left [PITH_FULL_IMAGE:figures/full_fig_p092_3_3.png]
Figure 3.4
Figure 3.4. Figure 3.4: Playing minigames. corners of the hard-question plots in [PITH_FULL_IMAGE:figures/full_fig_p093_3_4.png]
Figure 3.5
Figure 3.5. Figure 3.5: The overall Transcrib3D framework, which takes as input the colored point-cloud and referring expression (in green), and outputs the ID or bounding box of the referent object. To resolve the referring expression “the chair in the corner of the room, between the white…
Figure 3.6
Figure 3.6. Figure 3.6: Transcrib3D enables a robot to resolve complex 3D referring [PITH_FULL_IMAGE:figures/full_fig_p097_3_6.png]
Figure 3
Figure 3. Figure 3: illustrates our proposed Transcrib3D framework. Given the input [PITH_FULL_IMAGE:figures/full_fig_p099_3.png]
Figure 3.7
Figure 3.7. Figure 3.7: Illustration of the iterative code generation and reasoning process. [PITH_FULL_IMAGE:figures/full_fig_p101_3_7.png]
Figure 3.8
Figure 3.8. Figure 3.8: Qualitative comparisons between Transcrib3D (ours, in [PITH_FULL_IMAGE:figures/full_fig_p105_3_8.png]
Figure 3.9
Figure 3.9. Figure 3.9: Qualitative comparison of the grounding performance of (top) CaP [PITH_FULL_IMAGE:figures/full_fig_p109_3_9.png]
Figure 3.10
Figure 3.10. Figure 3.10: Typical failure cases in Transcrib3D, with ground-truth bounding [PITH_FULL_IMAGE:figures/full_fig_p110_3_10.png]
Figure 3.11
Figure 3.11. Figure 3.11: Overall Framework of Statler There has been a significant research interest in employing large language models to empower intelligent robots with complex reasoning. Existing work focuses on harnessing their abilities to reason about the histories of their actions an…
Figure 3.12
Figure 3.12. Figure 3.12: Model accuracies on the three-cups-and-a-ball shell game. LLM+State is a simplified version of our proposed Statler framework. For each method, the solid line shows how its accuracy a(n) changes with the number of swaps n. The dashed line is the relative accuracy: r…
Figure 3.13
Figure 3.13. Figure 3.13: Examples of simulations that show the result of executing different [PITH_FULL_IMAGE:figures/full_fig_p117_3_13.png]
Figure 3.14
Figure 3.14. Figure 3.14: The simulated domains we consider include a Pick-and-Place; b [PITH_FULL_IMAGE:figures/full_fig_p119_3_14.png]
Figure 3.15
Figure 3.15. Figure 3.15: Examples that show the result of querying LLMs with and without [PITH_FULL_IMAGE:figures/full_fig_p120_3_15.png]
Figure 3.16
Figure 3.16. Figure 3.16: A comparison of the resulting behavior for (top) Code-as-Policies [PITH_FULL_IMAGE:figures/full_fig_p123_3_16.png]

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Reference graph

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Pith tools

Reviewed August 5, 2026 · model on record in the stance chip above.