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abstract indexed · arXiv 2610.20576 · updated 2026-10-18

One Task, Many Interfaces: Simple Cross-Interface Consistency Training Improves LLM Agent Robustness

First page of One Task, Many Interfaces: Simple Cross-Interface Consistency Training Improves LLM Agent Robustness
From the original paper · arXiv 2610.20576Page 1. Select the image to read the PDF.

CIPR augments standard SFT or RL post-training, where each sample is scored independently under one interface, with a self-supervised KL penalty between action distributions produced under two interface views of the same sample in which action names are replaced by uninformative identifiers. It costs the construction of paired interface views and an additional forward pass per training sample to compute the cross-interface KL, but adds no inference-time latency or memory overhead. It can fail when held-out perturbations fall outside the consistency structure learned during training, it recovers only part of the robustness gap (10.5 of roughly 25 points), and it is inapplicable to teams that consume models exclusively through inference APIs without fine-tuning access.

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technical change
Cross-Interface Policy Regularization (CIPR) for tool-use agents
published
2026-10-14

The method is a lightweight training-time regularizer implementable on a single GPU for teams that fine-tune their own function-calling agents, but its partial recovery of the robustness gap and dependence on the training interface distribution require validation on the reader's specific tool schemas before production adoption.

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  1. claim 01Paperraft inference
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    CIPR augments standard SFT or RL post-training, where each sample is scored independently under one interface, with a self-supervised KL penalty between action distributions produced under two interface views of the same sample in which action names are replaced by uninformative identifiers. It costs the construction of paired interface views and an additional forward pass per training sample to compute the cross-interface KL, but adds no inference-time latency or memory overhead. It can fail when held-out perturbations fall outside the consistency structure learned during training, it recovers only part of the robustness gap (10.5 of roughly 25 points), and it is inapplicable to teams that consume models exclusively through inference APIs without fine-tuning access.

    This is a Paperraft inference. It is not pinned to a verified PDF passage.

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  2. claim 02Paperraft inference

    On agentic function calling, held-out interface perturbations reduce post-trained agent accuracy by nearly 25%, and CIPR recovers 10.5 percentage points of that drop while leaving accuracy on the unchanged interface intact.

    This is a Paperraft inference. It is not pinned to a verified PDF passage.

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quality

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latency

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arXiv 2610.20576

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