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Tessary

Tessary RCA

RCA is the explain step at the end of Tessary's pipeline. By the time it runs, the cheap classifiers have swept every trace and recorded findings, triage has ruled which of those findings are real deviations rather than legitimate changes, and the real ones have become a case. RCA runs on that case. Its job is attribution: saying why the deviation happened.

Each run is an agentic session in a fresh E2B microVM with the connected repo. It investigates the failing cohort with three inputs: the trace evidence, a dossier of what's known about the case, and the code itself.

The output is a set of grounded hypotheses for the cause, each with the evidence behind it, plus the checks the investigation ran and ruled out, so engineering doesn't repeat them. The report cites the files involved.

After attribution, RCA raises a PR with the fix.

6 questions

Answered, plainly.

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 →Is RCA turned on by default?No. RCA ships off by default; the three classifiers that ship on cost nothing to run, but an RCA run is a platform-paid agent session with no spend cap.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 →What is a root-cause report?What Tessary's RCA investigation produces: grounded hypotheses for a case's cause, the checks it ruled out, and the files involved.answer →Why does a root-cause report list more than one possible cause?Because RCA reports every hypothesis it can actually support with evidence, not the one guess picked to sound decisive.answer →

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