diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a6de2ae..3740004 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -28,17 +28,21 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: "3.13"
-      - name: Install and configure Poetry (this should ideally be done from pyproject.toml but..)
-        uses: snok/install-poetry@v1
+      - name: Install and configure Poetry
+        uses: snok/install-poetry@76e04a911780d5b312d89783f7b1cd627778900a # v1
         with:
-          version: 1.8.5
+          version: 2.3.2
           virtualenvs-create: true
       - name: Install poetry-dynamic-versioning
         run: poetry self add "poetry-dynamic-versioning[plugin]"
       - name: Install dependencies
         run: poetry install --with dev
-      - name: Run unit and integrations tests
-        run: poetry run pytest --junitxml=build/junit.xml --cov --cov-report=xml:build/coverage.xml tests
+      - name: Build wheel (used by e2e tests)
+        run: poetry build --format wheel
+      - name: Install plugin into Poetry (activates it for e2e tests)
+        run: poetry self add $(ls $PWD/dist/reqstool_python_poetry_plugin-*.whl | tail -1)
+      - name: Run tests
+        run: poetry run pytest --junitxml=build/junit.xml --cov --cov-report=xml:build/coverage.xml
       - name: Build project
         run: poetry build
       # Upload artifacts for later use
diff --git a/.github/workflows/check-semantic-pr.yml b/.github/workflows/check-semantic-pr.yml
index 5bacd57..459b868 100644
--- a/.github/workflows/check-semantic-pr.yml
+++ b/.github/workflows/check-semantic-pr.yml
@@ -2,8 +2,6 @@ name: Check Semantic PR
 on:
   pull_request:
     types: [opened, edited, synchronize, reopened]
-  pull_request_target:
-    types: [opened, edited, synchronize, reopened]
 
 jobs:
   check:
diff --git a/pyproject.toml b/pyproject.toml
index 15d1075..c32d7c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,15 +45,13 @@ addopts = [
     "-s",
     "--import-mode=importlib",
     "--log-cli-level=DEBUG",
-    '-m not slow or not integration',
 ]
 pythonpath = [".", "src", "tests"]
 testpaths = ["tests"]
 norecursedirs = ["tests/fixtures"]
 markers = [
-    "flaky: tests that can randomly fail through no change to the code",
-    "slow: marks tests as slow (deselect with '-m \"not slow\"')",
     "integration: tests that require external resources",
+    "e2e: end-to-end tests that run the full pipeline locally",
 ]
 
 [tool.black]
diff --git a/tests/e2e/__init__.py b/tests/e2e/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/e2e/reqstool_python_poetry_plugin/__init__.py b/tests/e2e/reqstool_python_poetry_plugin/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/e2e/reqstool_python_poetry_plugin/test_build_e2e.py b/tests/e2e/reqstool_python_poetry_plugin/test_build_e2e.py
new file mode 100644
index 0000000..c38075c
--- /dev/null
+++ b/tests/e2e/reqstool_python_poetry_plugin/test_build_e2e.py
@@ -0,0 +1,65 @@
+# Copyright © LFV
+import os
+import shutil
+import subprocess
+import tarfile
+import tempfile
+from pathlib import Path
+
+import pytest
+
+FIXTURE_DIR = Path(__file__).parents[2] / "fixtures" / "test_project"
+
+EXPECTED_IN_TARBALL = [
+    "reqstool_config.yml",
+    "annotations.yml",
+    "requirements.yml",
+    "software_verification_cases.yml",
+]
+
+
+def _plugin_installed() -> bool:
+    """Return True if the reqstool poetry plugin is registered as an application plugin."""
+    from importlib.metadata import entry_points
+
+    eps = entry_points(group="poetry.application.plugin")
+    return any(ep.name == "reqstool" for ep in eps)
+
+
+@pytest.mark.e2e
+@pytest.mark.skipif(not shutil.which("poetry"), reason="poetry not on PATH")
+@pytest.mark.skipif(not _plugin_installed(), reason="reqstool-python-poetry-plugin not installed in poetry")
+def test_poetry_build_sdist_contains_reqstool_artifacts():
+    """poetry build (sdist) triggers the reqstool plugin and bundles all artifacts."""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        tmp_project = Path(tmpdir) / "test_project"
+        shutil.copytree(
+            FIXTURE_DIR,
+            tmp_project,
+            ignore=shutil.ignore_patterns("dist", "build", "__pycache__", ".venv", "poetry.lock"),
+        )
+
+        result = subprocess.run(
+            ["poetry", "build", "--format", "sdist"],
+            cwd=tmp_project,
+            capture_output=True,
+            text=True,
+            env={k: v for k, v in os.environ.items() if k != "POETRY_ACTIVE"},
+        )
+        assert result.returncode == 0, f"poetry build failed:\n{result.stderr}"
+
+        tarballs = sorted((tmp_project / "dist").glob("mypackage-*.tar.gz"))
+        assert tarballs, "No tarball found in dist/"
+
+        with tarfile.open(tarballs[-1]) as tf:
+            names = tf.getnames()
+            for expected in EXPECTED_IN_TARBALL:
+                assert any(
+                    expected in n for n in names
+                ), f"{expected!r} missing from {tarballs[-1].name};\ngot: {names}"
+            # Verify annotations.yml content — confirms the decorator processor ran
+            member = next(m for m in tf.getmembers() if "annotations.yml" in m.name)
+            annotations_content = tf.extractfile(member).read().decode()
+
+        assert "REQ_001" in annotations_content, "annotations.yml missing REQ_001"
+        assert "SVC_001" in annotations_content, "annotations.yml missing SVC_001"
diff --git a/tests/integration/__init__.py b/tests/integration/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/integration/reqstool_python_poetry_plugin/__init__.py b/tests/integration/reqstool_python_poetry_plugin/__init__.py
new file mode 100644
index 0000000..e69de29