Coherent elastic neutrino-nucleus scattering ($\mathrm{CE}\nu \mathrm{NS}$) provides a pathway for reactor monitoring via compact detectors, benefiting from its enhanced cross section relative to inverse beta decay. We present a benchmark estimate of the sensitivity of $\mathrm{CE}\nu \mathrm{NS}$-based detectors to changes in the nuclear recoil spectrum caused by variations in reactor fuel composition, including ${}^{239}\mathrm{Pu}$ diversion. Incorporating spectral-shape information alongside rate measurements reduces the exposure required to detect a given amount of diverted plutonium compared to rate-only approaches. Across reactors of varying thermal power and fuel enrichment, low-power enriched-fuel reactors offer the most favorable detection conditions. Together, these results delineate how rate and spectral information in the $\mathrm{CE}\nu \mathrm{NS}$ interaction channel encode its fundamental sensitivity to plutonium diversion across reactor configurations.

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• Nucleus-neutrino interactions
• Neutrino detection