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The web UIs share a product switcher (Nisa on the left, Merv on the right). They don’t call each other.

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The bridge is an arXiv id

Nisa finds the paper; Merv records that the project uses it. Your agent runs nisa search / nisa related, takes the arxiv_id, and calls Merv’s litreview.cite with it — Merv registers the paper in the project ledger, deduplicates it against other forms of the same paper, and links it to the experiments or claims that cite it. There’s no automatic flow and no provenance field; the agent carries the id. To make that natural, install the Nisa skill alongside the Merv plugin in the same coding agent — see Install → Give your coding agent the skill and Using Nisa with Merv.