Tessary

Tessary classifiers

Tessary's classifiers are the cheap checks that run on every production trace. Sampling misses low- probability issues, and in a mature agent nearly every remaining issue is low-probability. So finding them means checking everything, which is only affordable when one check costs almost nothing.

Each trace is scored by the built-ins: frustration, groundedness, secret_leak, malformed_output, behavior_drift, duration_drift, cost_drift, and tool_error. When a score crosses its confidence threshold, a finding is created for further analysis; LLM judgment comes in only at that escalation step, never by default. Custom classifiers, fine-tuned for your agent's own failure modes, run alongside them.

Low-probability issues surface as they happen instead of weeks later through user reports, which is what keeps your critical agents reliable.

6 questions

Answered, plainly.

Can I add a custom classifier for my own agent?Yes. Custom classifiers run alongside the built-ins on the same finding-and-threshold mechanism, fine-tuned to your own agent's failure modes instead of a generic one.answer →How much does it cost to run a classifier on every trace?Classifiers are included in Tessary's price of $0.001 per trace with a $100 monthly minimum. At 1 million traces a month that is $1,000, and every trace is checked.answer →What happens when a Tessary classifier flags a trace?The score crossing its threshold writes a finding, not an alert. Triage decides whether it's a real deviation, and only then does it become a case.answer →What is a Tessary classifier?A narrow, cheap check that scores one production trace for a single property, cheap enough to run on all of it instead of a sample.answer →Why do Tessary's classifiers produce false positives?Because they're tuned to catch problems rather than miss them: cheap always-on checks flag anything that looks wrong, and triage filters the noise before anyone is alerted.answer →Why does Tessary check every trace instead of sampling?Sampling measures how often something happens; it is a poor tool for catching something rare, and in a mature agent nearly everything left to catch is rare.answer →

Send us the traces you already emit.

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