---
author: "Umesh Malik"
canonical: "https://umesh-malik.com/blog/tag/gemini"
description: "Explore articles tagged with Gemini by Umesh Malik — AI Engineer, LLM & GenAI Developer. Learn Gemini best practices, practical tips, and in-depth guides."
title: "Umesh Malik's Blog - Gemini Articles | Gemini Tutorials"
tokens: 145
generator: "scripts/generate-page-markdown.mjs"
---

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# Gemini

1 article

 [![The five sandbox tools a Gemini agent hook intercepts, against the two tool families it never sees](https://umesh-malik.com/blog/gemini-agent-hooks-fail-open-cover.png)

AI Security • Aug 19, 2026

### Gemini agent hooks fail open: how to block a tool call anyway

Gemini agent hooks fail open on every error path, and never fire for MCP or function tools. The deny contract, the coverage gap, and what to gate instead.

9 min read

Read more →](https://umesh-malik.com/blog/gemini-agent-hooks-fail-open)