Learn

Field notes

Real fixture patterns run through Crash Labs — written so freelancers can send clients a clear go / no-go story.

Invoice webhook → email + charge
Classic money path. Retries and spam can double-send or double-charge.
Payment reminders
Scheduled nag emails. Empty recipient and burst load are the usual killers.
AI draft with human approval
HITL helps, but only if the approve step is really before the send.
Leads into Google Sheets
Sheet writes look harmless until duplicates flood the CRM export.
Telegram + GPT bot
Chat bots with AI: coverage is partial, outbound still matters.
Low-risk manual flow
Control case. Should land closer to PASS when little leaves the company.
Gmail labels only
Label changes are not customer email. Score should reflect that.
Local HITL sample
Another approval-gated path for calibration.