An agent can follow its instructions perfectly and still pay the wrong amount, because the parser misread a table in the invoice. The agent never sees the PDF, only the extraction. If that step is wrong, everything downstream is confidently wrong too. Jerry Liu, co-founder and CEO of LlamaIndex, made this point in a June 2026 episode. A parser that represents a table wrong, or hallucinates at a meaningful rate, puts a workflow below the accuracy bar you can operate with, and the downstream ag...