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+name: Dev agent probe (one-off, #238)
+
+# Temporary: this branch is deleted after one run. It checks the dev-agent job on ubuntu and windows, and that
+# on Windows the port-takeover test fails once SO_EXCLUSIVEADDRUSE is removed.
+on:
+  push:
+    branches: [ "feat/devagent-ci-probe" ]
+
+jobs:
+  probe:
+    name: ${{ matrix.os }} / exclusive=${{ matrix.exclusive }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+        exclusive: [kept, removed]
+        exclude:
+          - os: ubuntu-latest
+            exclusive: removed
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+      - name: Remove SO_EXCLUSIVEADDRUSE
+        if: matrix.exclusive == 'removed'
+        shell: python
+        run: |
+          p = "python-multiplatform/src/commonMain/python/python_multiplatform_devagent.py"
+          s = open(p, encoding="utf-8").read()
+          old = 'if hasattr(socket, "SO_EXCLUSIVEADDRUSE"):'
+          assert s.count(old) == 1
+          open(p, "w", encoding="utf-8").write(s.replace(old, "if False:"))
+      - name: Dev agent protocol tests
+        working-directory: python-multiplatform/src/test/python
+        run: python -m unittest -v test_devagent