Trunk flaky-test quarantining

CI already uploads test results to Trunk, which detects flaky tests statistically and quarantines (auto-skips) them instead of letting them block merges — no upload setup is needed. The trunk MCP server ("CI Autopilot") is already configured for this repo; each user just needs a one-time per-user authentication. See REPOSITORY_GUIDE.md for the auth steps if trunk tools aren't available yet.

Investigating a failing CI run

Given a GitHub Actions workflow URL (e.g. from gh run view or a PR check), call investigate-ci-failure with that workflowUrl. It:

• Pulls Trunk's parsed test-result bundles for that run.
• Filters out tests already quarantined as known-flaky, so you only see real failures.
• Tells you if the job failed before tests ran (build/compile failure) — in that case fall back to raw CI logs (gh run view <id> --log-failed).

Prefer this over reading raw CI logs first when the repo has Trunk uploads configured — it does the flaky-vs-real triage for you.

Quarantining a specific flaky test

Do this whenever you've identified a test as flaky (from investigate-ci-failure, a user report, or repeated unrelated CI failures) and want it stopped from blocking merges.

1. Find the test case ID, if you don't already have one: call search-test with a fuzzy testNameSearch and the repoName (owner/repo).
2. Get evidence it's actually flaky before quarantining — call fix-flaky-test with the testCaseId:
   • Omit createNewInvestigation to fetch the latest existing investigation (ID, markdown summary, rendered facts).
   • Pass createNewInvestigation: true to enqueue a fresh manual investigation if there's no recent one, or if the failure looks different from what's on file.
   • If you already have an investigation ID, pass investigationId directly instead of a test case ID.
3. Quarantine it. No MCP tool performs this write — it's a dashboard-only action, gated by the repo's Manual Quarantine Permissions (admins-only in some repos). So:
   • Check whether the fix-flaky-test result includes a direct link to the test's Trunk dashboard page — surface it to the user.
   • Tell the user (or, if you have permission and are asked to do it yourself via a connected browser, do it) to open the test's details page and click Quarantine → Always, add a required comment, and Save. See REPOSITORY_GUIDE.md for the exact dashboard steps (details-page and table-row variants, plus how to un-quarantine).
   • Never report a test as "quarantined" until the user confirms the dashboard action was completed — there's no way to verify or perform the write through these tools.

Notes

• repoName is always owner/repo (GitHub), not the Trunk org slug.
• orgSlug is optional on most tools — only needed to disambiguate when the authenticated user belongs to multiple Trunk orgs.