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
AI agents
3 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 agent cost in production 2026: $0.40 for an 8-step loop
LLM agent costs in production 2026: three workload models with token math and USD totals per 1,000 runs, from a 3-call support bot to an 8-step coding loop.
LLMTest Blog6 min read
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