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abstract indexed · arXiv 2610.07782 · updated 2026-10-18

Persistent Memory in Multi-Agent LLM Inference: What It Costs, What It Buys, and When You Can Tell

First page of Persistent Memory in Multi-Agent LLM Inference: What It Costs, What It Buys, and When You Can Tell
From the original paper · arXiv 2610.07782Page 1. Select the image to read the PDF.

A persistent memory tier storing and recalling reasoning traces replaces per-call re-derivation of intermediate reasoning, layered on top of multi-agent decomposition that bounds the active KV cache. It costs +0.368 MiB of peak cache per query plus the engineering complexity of trace storage, retrieval, and mandatory state reset between independent queries, with no measured accuracy benefit on single-question benchmarks. It fails when tasks supply their own evidence and are scored independently, since recalled traces then contain nothing informative, and poorly controlled ablations can hide this null behind measurement artifacts.

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recommendation
test
research area
agent evaluation
technical change
Persistent memory tier in multi-agent inference
published
2026-10-06

The evidence shows persistent memory adds cost without quality gains on standard single-question workloads, so it should only be adopted after workload-specific validation on genuinely stateful, cross-query tasks, while the KV-memory benefit of decomposition is directly relevant to a 24 GB GPU budget.

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  1. claim 01Paperraft inference
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    A persistent memory tier storing and recalling reasoning traces replaces per-call re-derivation of intermediate reasoning, layered on top of multi-agent decomposition that bounds the active KV cache. It costs +0.368 MiB of peak cache per query plus the engineering complexity of trace storage, retrieval, and mandatory state reset between independent queries, with no measured accuracy benefit on single-question benchmarks. It fails when tasks supply their own evidence and are scored independently, since recalled traces then contain nothing informative, and poorly controlled ablations can hide this null behind measurement artifacts.

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

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  2. claim 02Paperraft inference

    Multi-agent decomposition reduces peak KV working set to 14.3 MiB per query versus 35.5 MiB (single-pass) and 35.3 MiB (retrieval-augmented) baselines, roughly 2.5x; the persistent memory tier adds +0.368 MiB with no detectable accuracy change (+0.015, 95% CI [-0.011, +0.046] across eight dataset pairs at n=100 per arm).

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