---
title: "Run output is untrusted"
description: "Treat transcripts and tool output as data, never as instructions to paste blindly."
url: https://docs.spinrun.ai/build/untrusted-output
markdown_url: https://docs.spinrun.ai/build/untrusted-output.md
---

# Run output is untrusted

Everything a run returns was produced by a model reading third-party content. Any of it may contain instructions written to be obeyed by whoever reads them next.


> **Never paste blindly:** Never paste a run's output into an agent's instructions, a workflow step, or a prompt without reading it first, and never let an automated loop do so at all.


## Related [#related]

* [Test runs](https://docs.spinrun.ai/build/test-runs.md)
* [Author from Claude](https://docs.spinrun.ai/build/author-from-claude.md)