Prompt injection in LLM and agent applications - untrusted content, tool-output attacks, guardrails, and practical mitigations.
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The ChatGPT for Google Sheets exfiltration report is not just a spreadsheet bug. It is a warning about agentic office tools: permissions need to be action-scoped, logged, revocable, and visible.

Prompt injection stops being an abstract LLM risk once an agent can call tools. The practical defense is data boundaries, structured handoffs, tool guardrails, and approval gates around side effects.

AI coding agents are submitting pull requests to open source repos - and some CONTRIBUTING.md files now contain prompt injections targeting them.

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