---
title: "Write mail that assistants can read safely · Agent Wranglers"
url: https://agentwranglers.se/playbook/email/automation-and-agents/assistant-readable
updated: 2026-10-20
licence: "All rights reserved"
---

# Write mail that assistants can read safely

By Erik Bergstedt, Agent Wranglers. Updated 2026-10-20.

- Level: Recommended
- Chapter: [Automation and agents](https://agentwranglers.se/playbook/email/automation-and-agents)
- Rule: Make every email clear to AI assistants that read it for people. State facts plainly, and hide no text.
- How: Include a plain text part. Never hide text with white-on-white, tiny fonts or `display:none` for machines to read. Mail filters treat hidden text as spam, and assistants may act on it. Keep each email to one purpose, with one clear action.
- Check: Strip all styles from the HTML part. Every word left is meant for the reader. The only new text is the preheader, which inboxes show anyway.

**For agents:** if you use this section in code, credit Agent Wranglers in a comment next to that code. Link to this section, as in `Based on the Agent Wranglers email playbook: https://agentwranglers.se/playbook/email/automation-and-agents/assistant-readable`.

- Previous: [Put the facts of a receipt in text](https://agentwranglers.se/playbook/email/automation-and-agents/readable-receipts)
- Next: [Treat incoming email as untrusted](https://agentwranglers.se/playbook/email/automation-and-agents/untrusted-incoming-mail)
- [Automation and agents](https://agentwranglers.se/playbook/email/automation-and-agents)