How do you make sure an AI answer never saves wrong data or charges twice?
- Module
- 03/05
- To read
- ~5 min
During an API timeout storm, a payment agent retried a billing step several times. What do you think went wrong?
In the module you make your guess first, then read what happened and why.
Zero-Trust Gatekeeping
Cryptographic Idempotency Keys
Fail-Closed Validation
State Replay Safety
A check-before-save and no-double-charge plan
A spec for your own app, as a text file you download. The module also gives you the prompt for Claude Code, Codex or Antigravity, a checklist to check what it built, and recommended skills.
- Database indexes
- Caching the first result
- Queues deliver at least once