Magnus is an analytics platform for mobile and web app publishers. It aggregates marketing spend from ad networks, subscription and in-app revenue, ad-network monetization, payment-provider outcomes and first-party product-analytics events into one place, so a publisher can ask how a campaign, an app or an experiment is actually performing. Over MCP the app exposes that data read-only. Three tools answer questions: marketing_timeline_report for acquisition and monetization performance (installs, spend, revenue, ROMI, forecasts), finances_risk_report and finances_risk_approval_rates for payment risk (approval rate, refunds, fraud alerts, disputes, chargebacks). A second group answers product-analytics questions from the publisher's own SDK events: event counts, funnels, retention, user-property segments and A/B experiment configuration. Everything else is a lookup helper that exists to feed those tools with real ids, filter values and metric definitions, because app ids, event names and metric semantics are account-specific and cannot be guessed. Access is scoped to the companies the signed-in user is an active member of, and that membership is re-checked on every single call, so the model can never reach another tenant's data. The OAuth scope the app requests, mcp:analytics.read, grants read access only: no tool in the server can create, update or delete anything.

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