Beyond the Hype: Why File Handling Remains LLM Agents' Critical Weakness

File input failures represent a critical blind spot in LLM agent development—a challenge that undermines production deployment despite being largely overlooked by the industry. Beyond technical hurdles like context window limitations and parsing complexity, these failures introduce security vulnerabilities through indirect prompt injection and operational instability. Developers building production-grade AI systems must understand why structured data consistently defeats modern language models.