stop optimizing tokens, start optimizing outcomes

hey guys, been thinking about AI cost optimization a lot lately. honestly most teams approach it backwards, and i did too. jumped straight to cheaper models and shorter prompts before even asking which user, agent, or workflow was actually creating the cost, and whether i could stop it before the provider sees the next request. picked nexos.ai for the gateway layer. because alerts were always firing after the money was already gone. attribution first provider dashboards show spend by model or API key, but one user action can kick off a whole chain of model calls, retries, fallbacks, and tool loops. was tweaking the cheap parts for weeks and completely missing where the bill was coming from. tagging every request with metadata - user, team, workflow ID, model, retry/fallback status, outcome - fixed that pretty fast. enforce before the request tried alerts first, didn't work, money was already gone by the time anything fired. the pattern that actually slapped: calculate a token reservation, atomically reserve it against the budget, forward only if it succeeds, reconcile after. threw in circuit breakers for runaway loops and kept dev and prod budgets separate. that combo caught a ton of accidental overspend. retry and loop waste hits harder ngl i didn't see it coming. kept fixating on model costs and didn't clock the retry loops until i tracked workflows end to end. a cheaper model doesn't fix an agent calling it 300 times. the number i now track religiously: total spend on calls, retries, and fallbacks / successfully completed workflows. cutting cost per call while retries crept up was making my dashboard look clean while the real bill kept getting worse. do your spend controls stop requests before charges hit or just alert after? and how much of your bill turned out to be failed and retried garbage?