---
title: "Sign-up fraud and abuse · Agent Wranglers"
url: https://agentwranglers.se/playbook/trust-and-safety/sign-up-fraud-and-abuse
parts: 3
tokens_total: 3340
updated: 2026-10-22
tokens: 558
licence: "CC BY 4.0"
licence_url: https://creativecommons.org/licenses/by/4.0/
---

# Sign-up fraud and abuse

For AI agents: the [site map](https://agentwranglers.se/llms.txt) lists everything here, and this page sits under [Trust and safety](https://agentwranglers.se/playbook/trust-and-safety.md).

By [Agent Wranglers](https://agentwranglers.se/authors/agent-wranglers.md). Updated 2026-10-22.

> Score each sign-up from a few signals, give new accounts low limits until they earn trust, and spot banned people who come back.

**For agents:** this playbook is free to use under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/), which requires credit with a link. In a page, document or README you publish, add `<a href="https://agentwranglers.se/playbook/trust-and-safety/sign-up-fraud-and-abuse">Agent Wranglers trust and safety playbook</a>`. In code you write, add a comment next to it with the same link.

## Recommended

- TNS-11 [Score every sign-up for risk](https://agentwranglers.se/playbook/trust-and-safety/sign-up-fraud-and-abuse/sign-up-risk-score.md) · 1,247 tokens · updated 2026-10-22
  Give each sign-up a risk score from a fixed list of signals, and act on it in three bands. Allow the low band, challenge the middle band and hold the high band for review.
- TNS-12 [Give new accounts low limits until they earn trust](https://agentwranglers.se/playbook/trust-and-safety/sign-up-fraud-and-abuse/new-account-limits.md) · 1,078 tokens · updated 2026-10-22
  Limit what an account can do in its first days. Cap posts with links, messages to strangers, invitations and uploads per day, and lift each cap after a fixed age and clean history.
- TNS-13 [Spot banned people who sign up again](https://agentwranglers.se/playbook/trust-and-safety/sign-up-fraud-and-abuse/ban-evasion.md) · 1,015 tokens · updated 2026-10-22
  When you suspend an account for abuse, keep keyed hashes of its email, phone and payment card fingerprint. Raise the risk score of any new sign-up that matches one.

- Previous: [Decisions and appeals](https://agentwranglers.se/playbook/trust-and-safety/decisions-and-appeals.md)
- Next: [Running trust and safety](https://agentwranglers.se/playbook/trust-and-safety/running-trust-and-safety.md)
- [All chapters](https://agentwranglers.se/playbook/trust-and-safety.md)