Is RCA turned on by default?

No. RCA ships off, and you turn it on for the org. The reason is different from why most other classifiers start off. duration_drift, cost_drift, and tool_error ship on because they cost nothing to run: checking every trace with a deterministic watcher is free either way. RCA is not free. Each run is an isolated agentic session that reads your repo and reasons over a failing cohort, and that is a platform-paid LLM call with no cap on how much it can spend investigating one case.

So turning on a classifier costs nothing to look at. Turning on RCA means agreeing to pay for investigations as they happen, which is a decision worth making on purpose rather than inheriting from a default. Once it is on, any case that clears triage can trigger a root cause run instead of leaving you to write the investigation yourself.

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Does Tessary fix the regression itself?It proposes the fix. After naming the cause, RCA opens a pull request against your repo, and a person reviews and merges it, so nothing ships on its own.answer →Does Tessary need access to my repo to find the root cause?Not strictly. RCA reads a connected repo when you give it one, but an evidence-only investigation still runs and completes, with a stated ceiling.answer →What happens after Tessary confirms a case?The case reaches a person, and root-cause analysis is theirs to start on it: an isolated investigation over that case's evidence, ending in a report.answer →Everything on tessary RCAThe definition, and every question answered under tessary RCA.concept →

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