.github/workflows/mutation-redundancy.yml

name: Mutation Redundancy (disableBail, on-demand)
# One-off measurement to UNBLOCK R1 (test-redundancy prune). The nightly mutation run
# (nightly-mutation.yml) bails on the first kill, so `killedBy` lists only the FIRST
# killer — 🟠 redundant is understated and 🟢 unique overstated (see the caveat in
# scripts/quality/mutation-radiography.mjs). This workflow re-runs the SAME combo +
# chatCore leaf batches with stryker.disablebail.json (disableBail:true, incremental:false)
# so `killedBy` lists EVERY killer. Feed the uploaded reports to
# `node scripts/quality/mutation-radiography.mjs --candidates mutation-nobail-*/mutation.json`
# to get the accurate R1 prune-candidate list (🔴 empty ∪ 🟠 redundant) for human review.
#
# Batches mirror the nightly's leaf decomposition (d/e/f/g/h/i) rather than 2 mega-batches:
# disableBail is MORE expensive than bail (it never stops early), and Stryker only writes
# mutation.json on a SUCCESSFUL finish — a batch cancelled at the cap produces NO data — so
# smaller batches each fit the 300min headroom and run in parallel. auth/accountFallback and
# the security quartet are out of scope: R1 targets the combo/chatCore leaves.
on:
  workflow_dispatch:

permissions:
  contents: read

jobs:
  stryker-nobail:
    name: Stryker disableBail (batch ${{ matrix.batch.name }})
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        batch:
          - name: d
            mutate: "open-sse/services/combo/comboStructure.ts,open-sse/services/combo/autoStrategy.ts,open-sse/services/combo/validateQuality.ts"
          - name: e
            mutate: "open-sse/services/combo/shadowRouting.ts,open-sse/services/combo/targetSorters.ts,open-sse/services/combo/comboPredicates.ts,open-sse/services/combo/rrState.ts,open-sse/services/combo/comboData.ts"
          - name: f
            mutate: "open-sse/services/combo/quotaScoring.ts,open-sse/services/combo/quotaStrategies.ts"
          - name: g
            mutate: "open-sse/handlers/chatCore/comboContextCache.ts,open-sse/handlers/chatCore/idempotency.ts,open-sse/handlers/chatCore/passthroughHelpers.ts,open-sse/handlers/chatCore/responseHeaders.ts,open-sse/handlers/chatCore/sanitization.ts,open-sse/handlers/chatCore/upstreamTimeouts.ts"
          - name: h
            mutate: "open-sse/handlers/chatCore/headers.ts,open-sse/handlers/chatCore/logTruncation.ts,open-sse/handlers/chatCore/memoryExtraction.ts,open-sse/handlers/chatCore/nonStreamingSse.ts,open-sse/handlers/chatCore/passthroughToolNames.ts,open-sse/handlers/chatCore/executorHelpers.ts"
          - name: i
            mutate: "open-sse/handlers/chatCore/telemetryHelpers.ts,open-sse/handlers/chatCore/memorySkillsInjection.ts,open-sse/handlers/chatCore/semanticCache.ts"
    timeout-minutes: 300
    steps:
      - uses: actions/checkout@v7
        with:
          persist-credentials: false
      - uses: actions/setup-node@v6
        with:
          node-version: "24"
          cache: npm
      - run: npm ci
      - name: Run Stryker (disableBail)
        env:
          BATCH_MUTATE: ${{ matrix.batch.mutate }}
        run: npx stryker run --config-file stryker.disablebail.json --mutate "$BATCH_MUTATE"
      - name: Upload mutation report
        if: always()
        uses: actions/upload-artifact@v7
        with:
          name: mutation-nobail-${{ matrix.batch.name }}
          path: reports/mutation/
          if-no-files-found: warn
          retention-days: 14