skills/skills/triage/SKILL.md

name, description

name	description
triage	Triage a failing CI run, pipeline, or job set to a verified root cause and a real fix. Trigger when a build, test, or deploy pipeline has one or more failed jobs. Applies the dialectic skill to every failing job independently, the coordinate skill to every failure cluster, and the funnel skill to every cluster, so each cluster is fixed in its own worktree. Portable across projects.

Drive a red pipeline to green by root cause, not by guesswork. Treat every failing job as its own investigation, and do not declare a fix until that job's root cause is proven.

Procedure

0. Check the run against HEAD before anything else. A CI run is a snapshot of one commit, and the branch has moved since. Run git log --oneline <run-sha>..HEAD | wc -l as the first command of the triage. Zero means the run speaks for the current tree and you proceed. Non-zero means it does not, and you scope the job set down before enumerating, clustering, or spawning anything — every job you investigate against stale code is work thrown away, and a fix proposed there risks reverting someone else's. Two cheap discriminators do it without opening an artifact: git diff --name-only <run-sha>..HEAD -- <source dir> | cut -d/ -f2 | sort -u for which components already moved, and a grep of the saved job logs for the literal error signature of each cause already fixed in that range. What survives both is the job set the rest of this procedure applies to; say how many jobs you dropped and why.
1. Enumerate every failing job. Pull the run's job list and isolate each job whose conclusion is failure, cancelled, or timed-out. A downstream aggregate job that fails only because an upstream job did is not a separate root cause — note it and move on.
2. Cluster the failures by error message. Group the failing jobs by their actual failing line, not by job name. Jobs whose messages differ in anything but the interpolated identifiers (host, app, port, path) belong in separate clusters.
3. Coordinate every cluster. Invoke the coordinate skill for each cluster before fixing it: tell the agents whose branches this one inherits from or passes its commits on to which run failed and on which line, ask whether someone already fixes it, and either take their fix or claim yours. Keep investigating while you wait for answers.
4. Download artifacts per cluster. Use the ci-artifacts skill for the mechanics — it covers per-job logs while a run is still in progress, which bundle to pull, and the grep hygiene that keeps a false positive from becoming a root cause. For each cluster, fetch every artifact of one representative job: reports, rescue diagnostics, inventories, container logs. Pull a second member's artifacts only when the representative's evidence does not explain the whole cluster. The job log usually names an artifact path and nothing more; the assertion text, the server-side exception and the state dumps are inside the artifact. Do this even when the log looks conclusive, because a log that explains the symptom rarely explains the cause.
5. One funnel per cluster. Hand every cluster you claimed in step 3 to the funnel skill: one agent per cluster, working in its own worktree on its own branch created from the exact current HEAD, with that cluster as its only concern, the artifact paths of step 4 in its brief and a hard time cap. Steps 6 to 8 run inside that sidetree, so no cluster's edits land under another cluster's work or under a running gate or deploy. Run clusters in parallel only when their fixes touch different files and the machine has room. A split cluster (step 7) gets a funnel of its own.
6. Dialectic per cluster. For EACH cluster, invoke the dialectic skill: form a thesis about the root cause from evidence (the job log, its artifacts, the code at the run's commit, git history), attack it with independent skeptics, and iterate to a ~99% thesis.
7. Distinguish shared vs hidden causes. A cluster is a hypothesis, not a proof: if the dialectic shows one cluster splitting into two causes, split it. When a job hides a second failure behind the first, keep going until the job is actually green, not just past the first error.
8. Fix at the root, through the funnel. Apply the real fix for each proven root cause in the cluster's sidetree, with a test and a negative control as the funnel skill demands. The fix enters the main line only at the funnel's bar (at least 90 % fix confidence, under 5 % break risk) after its independent review; below the bar the cluster ends as a proposal for the operator, never as a merge. Never mask a failure: no retry-until-pass, no disabling the check, no soft-skip. If a failure is genuinely external (upstream outage, flaky infra), confirm that with evidence and surface it honestly instead of fixing around it. Report every fix, every proposal, and every abandoned attempt to the same agents through the coordinate skill, then remove the sidetree.
9. Follow the run. While the run is still in progress, re-check it periodically and triage each newly failed job as it appears. The run is done only when it has finished and every failure has a verified fix.

Rules

• Executed evidence beats reasoning: read the actual failing log line and the artifact, not the job title.
• A derived source is not evidence. A conversation summary, your own earlier message, a cluster table you built ten minutes ago, or a subagent's report proves nothing on its own. Only the job log, the artifact, the code at the run's commit, and command output you just ran count. Quote them literally; if you cannot quote it, you do not know it.
• Re-derive after a context compaction. A summary carried across a compaction boundary preserves your conclusions but not the evidence under them, and a cluster assignment that was wrong stays wrong while reading as settled fact. Before acting on any pre-compaction attribution, rebuild it from the job logs.
• Classify each failure: a real defect (fix it), a flake or infra hiccup (prove it is transient before dismissing), or already-fixed-by-a-later-commit. For that last class the comparison is <run-sha>..HEAD, never the run's commit alone: the run cannot contain a fix that landed after it, so looking there can only ever confirm the failure. Name the commit that carries the fix.
• Report a per-job verdict: root cause, the artifact path and line that prove it, the fix, the cluster's sidetree branch, and the funnel verdict (merged or proposal). A verdict that cites only the job log has not finished step 4.