SaaS spend quietly compounds — the same tool on two cards, a plan that doubled at renewal, seats nobody uses anymore. Each run pulls recurring charges from the Stripe ledger for the window, normalizes vendor names so one tool under two card descriptors becomes one line, and flags duplicate charges, price hikes, and unused seats with the dollar impact of each. It builds a renewal calendar where anything renewing inside 30 days carries a cancel or renegotiate recommendation, and computes an annualized savings estimate ranked by impact. The spreadsheet inventory and the savings alert are staged behind one approval gate — nothing writes to your sheet or posts to Slack unreviewed. Idempotent per vendor + window: reruns update the inventory in place, never duplicate a line or re-alert on a renewal already flagged.