My autonomous Meta Ads agent confidently reported 34x my actual ad spend. How I'm fixing it through conversation instead of rebuilding the workflow.
I built an AI agent to manage Meta ads for my wife's small ecom store in Pakistan. Full access to the ad account via API. Monitor campaigns, track ROAS and ACOS, flag issues, recommend changes.
First real audit, it told me I'd spent 2.8M PKR in a period where Ads Manager showed 22k. Stated with total confidence, nicely formatted tables and everything. I only caught it because I know my own numbers.
Here's the part that changed how I think about agents. Instead of opening a workflow editor and tracing nodes, I challenged it in chat. Told it I didn't trust it. Then asked it to audit its own instructions and tell me what was missing. It came back with its own diagnosis: it was trusting raw API output without sanity-checking against my stated reality, reporting spend without campaign-level verification, and never flagging anomalies. It proposed adding a data integrity protocol and a "financial controller" role to its own system prompt. I approved, and that's now baked into its permanent instructions and memory, not just that one conversation.
It's not done. It still needs output validation before I'll trust a single number it gives me, and it fell over when I added browsing tools. But coaching an agent like a junior employee, and having the correction stick across sessions, feels fundamentally different from debugging a Zapier or n8n flow every time something drifts.
Question for people building agents on n8n, Make, or code: how do you handle an agent confidently reporting wrong numbers? Prompt-level guardrails, hard output validation against source of truth, or do you just keep a human in the loop forever?