When Your Tool Returns Garbage, Agents Loop Forever. Here's the 30-Line Guard.

May 24, 2026 · 9:29 AM UTC ·8 min read · 0 reactions · 0 comments · 38 views

TL;DR · WeSearch summary

The article discusses the challenges faced when AI tools return malformed data, leading to endless retry loops. It emphasizes the need for a 30-line Python guard to handle different types of tool failures effectively. By categorizing failures and providing structured error messages, the guard can prevent unnecessary costs and improve user experience.

Key facts

▪Malformed JSON responses can cause AI models to endlessly retry calls, leading to increased costs and user frustration.
▪The article outlines three classes of tool failures: schema mismatch, partial data, and semantic garbage, each requiring different handling strategies.
▪Implementing a 30-line guard can help classify failures and provide appropriate feedback to the AI model, preventing wasted resources.

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Original publisher	DEV.to (Top)
Canonical URL	https://dev.to/gabrielanhaia/when-your-tool-returns-garbage-agents-loop-forever-heres-the-30-line-guard-5b09
Publication time	Sun, 24 May 2026 09:29:24 +0000
Retrieval time	2026-05-24T09:37:31.883Z
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Opening excerpt (first ~120 words) tap to expand

try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 425693) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Gabriel Anhaia Posted on May 24 When Your Tool Returns Garbage, Agents Loop Forever. Here's the 30-Line Guard. #agents #ai #llm #python Book: AI Agents Pocket Guide: Patterns for Building Autonomous Systems with LLMs Also by me: Thinking in Go (2-book series) — Complete Guide to Go Programming + Hexagonal Architecture in Go My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub A tool returns a malformed…

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