What is prompt injection? The 3 attack surfaces to fix
Prompt injection hijacks your LLM via user input, retrieved docs, and tool results. Three attack surfaces, and the defenses that actually work in production.
LLMTest Blog7 min read
glossary
5 stories
What is an AI agent? Tool loops, stalls, and 3 prod decisions
An AI agent is an LLM in a tool-calling loop. How loops work, why they stall or run away, and the 3 architecture decisions that matter in production.
LLMTest Blog6 min readLLM hallucinations explained: causes, types, production fixes
Why LLMs hallucinate, the three error types, prompting patterns that reduce them, and the one production eval that catches failures before your users see them.
LLMTest Blog6 min readJSON mode explained: when schema enforcement beats prompting
JSON mode vs structured output: how constrained decoding works, when 3% failure rates become a real cost, and which enforcement approach your pipeline needs.
LLMTest Blog5 min readSystem prompt explained: behavior, cost, and pitfalls
A system prompt is the hidden instruction block that shapes every LLM response. Here's how it works, what it costs, and the production pitfalls to avoid.
LLMTest Blog6 min read
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