diff --git a/guarddog_nexus/api/packages.py b/guarddog_nexus/api/packages.py
index 88d4839..92cebd2 100644
--- a/guarddog_nexus/api/packages.py
+++ b/guarddog_nexus/api/packages.py
@@ -18,19 +18,16 @@ async def list_packages(
     flagged: bool | None = Query(None),
     session: AsyncSession = Depends(get_session),
 ):
-    subq = (
-        select(
-            Scan.package_name,
-            Scan.package_version,
-            Scan.ecosystem,
-            Scan.repository,
-            func.max(Scan.started_at).label("last_scanned_at"),
-            func.max(Scan.flagged).label("is_flagged"),
-            func.sum(Scan.total_findings).label("total_findings"),
-            func.max(Scan.id).label("latest_scan_id"),
-        )
-        .group_by(Scan.package_name, Scan.package_version)
-    )
+    subq = select(
+        Scan.package_name,
+        Scan.package_version,
+        Scan.ecosystem,
+        Scan.repository,
+        func.max(Scan.started_at).label("last_scanned_at"),
+        func.max(Scan.flagged).label("is_flagged"),
+        func.sum(Scan.total_findings).label("total_findings"),
+        func.max(Scan.id).label("latest_scan_id"),
+    ).group_by(Scan.package_name, Scan.package_version)
 
     if ecosystem:
         subq = subq.where(Scan.ecosystem == ecosystem)
@@ -41,11 +38,10 @@ async def list_packages(
     total = await session.scalar(total_q)
 
     rows = (
-        (await session.execute(
+        await session.execute(
             subq.order_by(func.max(Scan.started_at).desc()).offset(offset).limit(limit)
-        ))
-        .all()
-    )
+        )
+    ).all()
 
     return {
         "total": total,
@@ -74,12 +70,16 @@ async def get_package(
     session: AsyncSession = Depends(get_session),
 ):
     scans = (
-        await session.execute(
-            select(Scan)
-            .where(Scan.package_name == name, Scan.package_version == version)
-            .order_by(Scan.started_at.desc())
+        (
+            await session.execute(
+                select(Scan)
+                .where(Scan.package_name == name, Scan.package_version == version)
+                .order_by(Scan.started_at.desc())
+            )
         )
-    ).scalars().all()
+        .scalars()
+        .all()
+    )
 
     if not scans:
         return {"detail": "Not found"}
@@ -87,10 +87,8 @@ async def get_package(
     all_findings = []
     for s in scans:
         findings = (
-            await session.execute(
-                select(Finding).where(Finding.scan_id == s.id)
-            )
-        ).scalars().all()
+            (await session.execute(select(Finding).where(Finding.scan_id == s.id))).scalars().all()
+        )
         all_findings.extend(f.__dict__ for f in findings)
 
     return {
diff --git a/guarddog_nexus/api/scans.py b/guarddog_nexus/api/scans.py
index a0a9fcb..c036a69 100644
--- a/guarddog_nexus/api/scans.py
+++ b/guarddog_nexus/api/scans.py
@@ -52,9 +52,7 @@ async def list_scans(
 @router.get("/stats")
 async def scan_stats(session: AsyncSession = Depends(get_session)):
     total_scans = await session.scalar(select(func.count(Scan.id)))
-    flagged_scans = await session.scalar(
-        select(func.count(Scan.id)).where(Scan.flagged == True)
-    )
+    flagged_scans = await session.scalar(select(func.count(Scan.id)).where(Scan.flagged == True))
     recent_flagged = await session.scalar(
         select(func.count(Scan.id)).where(
             Scan.flagged == True,
@@ -72,9 +70,7 @@ async def scan_stats(session: AsyncSession = Depends(get_session)):
         )
     ).all()
 
-    latest_scan = await session.scalar(
-        select(Scan).order_by(Scan.started_at.desc()).limit(1)
-    )
+    latest_scan = await session.scalar(select(Scan).order_by(Scan.started_at.desc()).limit(1))
 
     return {
         "total_scans": total_scans,
diff --git a/guarddog_nexus/nexus_client.py b/guarddog_nexus/nexus_client.py
index 05bdf9e..8c81582 100644
--- a/guarddog_nexus/nexus_client.py
+++ b/guarddog_nexus/nexus_client.py
@@ -39,9 +39,12 @@ def download_asset(download_url: str, dest_dir: str) -> str | None:
     try:
         result = subprocess.run(
             [
-                "curl", "-sfSL",
-                "-u", f"{config.nexus_username}:{config.nexus_password}",
-                "-o", dest_path,
+                "curl",
+                "-sfSL",
+                "-u",
+                f"{config.nexus_username}:{config.nexus_password}",
+                "-o",
+                dest_path,
                 download_url,
             ],
             capture_output=True,
diff --git a/guarddog_nexus/scanner.py b/guarddog_nexus/scanner.py
index 1cce125..991db92 100644
--- a/guarddog_nexus/scanner.py
+++ b/guarddog_nexus/scanner.py
@@ -11,10 +11,14 @@ GUARDDOG_BIN = shutil.which("guarddog") or "guarddog"
 
 
 def scan_package(filepath: str, ecosystem: str = "pypi") -> dict:
-    """Run guarddog scan on a downloaded package file. Returns parsed JSON output."""
+    """Run guarddog scan on a downloaded package file. Returns normalized dict."""
     cmd = [
-        GUARDDOG_BIN, ecosystem, "scan", filepath,
-        "--output-format", "json",
+        GUARDDOG_BIN,
+        ecosystem,
+        "scan",
+        filepath,
+        "--output-format",
+        "json",
     ]
 
     log.info("Running: %s", " ".join(cmd))
@@ -28,47 +32,74 @@ def scan_package(filepath: str, ecosystem: str = "pypi") -> dict:
         )
     except subprocess.TimeoutExpired:
         log.error("GuardDog scan timed out for %s", filepath)
-        return {"issues": [], "errors": ["timeout"]}
+        return {"findings": [], "errors": ["timeout"]}
     except FileNotFoundError:
         log.error("GuardDog binary not found at %s", GUARDDOG_BIN)
-        return {"issues": [], "errors": ["guarddog_not_found"]}
+        return {"findings": [], "errors": ["guarddog_not_found"]}
 
     if result.returncode not in (0, 1):
         log.error("GuardDog exited %d: %s", result.returncode, result.stderr)
-        return {"issues": [], "errors": [result.stderr.strip()]}
+        return {"findings": [], "errors": [result.stderr.strip()]}
 
     try:
         data = json.loads(result.stdout)
     except json.JSONDecodeError:
         log.error("GuardDog returned invalid JSON for %s", filepath)
-        return {"issues": [], "errors": ["json_parse_error"]}
+        return {"findings": [], "errors": ["json_parse_error"]}
 
     return _normalize_output(data)
 
 
 def _normalize_output(data: dict) -> dict:
-    """Normalize guarddog JSON output across versions into a consistent format.
+    """Normalize guarddog JSON into consistent format.
 
-    GuardDog JSON format (varies by version):
-      {
-        "results": [{"rule": "...", "severity": "...", "message": "...", "location": "..."}],
-        "errors": [...]
-      }
-    Or simpler:
-      {"issues": [...], "errors": [...]}
+    GuardDog v2 JSON:
+      {"package": "...", "issues": N, "errors": {}, "results": {"rule": null|{}|str|list}}
+    Rules mapped as:
+      - null   → not applicable, skip
+      - {}     → active but no findings, skip
+      - str    → metadata finding (description)
+      - list   → semgrep findings [{message, location, code}]
     """
     findings = []
+    results = data.get("results", {})
 
-    for entry in data.get("results", data.get("issues", [])):
-        if isinstance(entry, dict):
-            findings.append({
-                "rule": entry.get("rule", entry.get("id", "unknown")),
-                "severity": entry.get("severity", "WARNING"),
-                "message": entry.get("message", entry.get("description", "")),
-                "location": entry.get("location", entry.get("path", "")),
-            })
+    if isinstance(results, list):
+        results = {}
+
+    for rule_name, value in results.items():
+        if value is None:
+            continue
+        if isinstance(value, str):
+            findings.append(
+                {
+                    "rule": rule_name,
+                    "severity": "WARNING",
+                    "message": value,
+                    "location": "",
+                }
+            )
+        elif isinstance(value, list):
+            for item in value:
+                if isinstance(item, dict):
+                    findings.append(
+                        {
+                            "rule": rule_name,
+                            "severity": item.get("severity", "WARNING"),
+                            "message": item.get("message", ""),
+                            "location": item.get("location", ""),
+                        }
+                    )
+        elif isinstance(value, dict) and not value:
+            continue
+
+    errors = data.get("errors", {})
+    if isinstance(errors, dict):
+        errors_list = [f"{k}: {v}" for k, v in errors.items() if v]
+    else:
+        errors_list = errors if isinstance(errors, list) else []
 
     return {
         "findings": findings,
-        "errors": data.get("errors", []),
+        "errors": errors_list,
     }
diff --git a/guarddog_nexus/web/routes.py b/guarddog_nexus/web/routes.py
index faa744b..f03aced 100644
--- a/guarddog_nexus/web/routes.py
+++ b/guarddog_nexus/web/routes.py
@@ -28,9 +28,7 @@ def _render(name: str, **context) -> HTMLResponse:
 @router.get("/", response_class=HTMLResponse)
 async def dashboard(request: Request, session: AsyncSession = Depends(get_session)):
     total_scans = await session.scalar(select(func.count(Scan.id)))
-    flagged_scans = await session.scalar(
-        select(func.count(Scan.id)).where(Scan.flagged == True)
-    )
+    flagged_scans = await session.scalar(select(func.count(Scan.id)).where(Scan.flagged == True))
     recent_flagged = await session.scalar(
         select(func.count(Scan.id)).where(
             Scan.flagged == True,
@@ -39,9 +37,7 @@ async def dashboard(request: Request, session: AsyncSession = Depends(get_sessio
     )
     total_findings = await session.scalar(select(func.count(Finding.id)))
     latest_scans = (
-        (await session.execute(
-            select(Scan).order_by(Scan.started_at.desc()).limit(10)
-        ))
+        (await session.execute(select(Scan).order_by(Scan.started_at.desc()).limit(10)))
         .scalars()
         .all()
     )
@@ -138,10 +134,7 @@ async def packages_list(
     total = await session.scalar(select(func.count()).select_from(subq))
     rows = (
         await session.execute(
-            select(subq)
-            .order_by(subq.c.last_scan.desc())
-            .offset(offset)
-            .limit(per_page)
+            select(subq).order_by(subq.c.last_scan.desc()).offset(offset).limit(per_page)
         )
     ).all()
 
@@ -166,13 +159,17 @@ async def package_detail(
     from sqlalchemy.orm import selectinload
 
     scans = (
-        await session.execute(
-            select(Scan)
-            .where(Scan.package_name == name, Scan.package_version == version)
-            .options(selectinload(Scan.findings))
-            .order_by(Scan.started_at.desc())
+        (
+            await session.execute(
+                select(Scan)
+                .where(Scan.package_name == name, Scan.package_version == version)
+                .options(selectinload(Scan.findings))
+                .order_by(Scan.started_at.desc())
+            )
         )
-    ).scalars().all()
+        .scalars()
+        .all()
+    )
 
     if not scans:
         return HTMLResponse("<h1>Not found</h1>", status_code=404)
diff --git a/guarddog_nexus/webhooks.py b/guarddog_nexus/webhooks.py
index bd3110e..58dbc15 100644
--- a/guarddog_nexus/webhooks.py
+++ b/guarddog_nexus/webhooks.py
@@ -17,7 +17,8 @@ router = APIRouter(prefix="/webhooks", tags=["webhooks"])
 RELEVANT_ACTIONS = {"CREATED", "UPDATED"}
 
 EXCLUDE_NAME_PATTERNS = [
-    re.compile(p) for p in [
+    re.compile(p)
+    for p in [
         r"^simple/",
         r"\.html$",
         r"\.json$",
@@ -51,9 +52,7 @@ async def nexus_webhook(
             raise HTTPException(
                 status_code=status.HTTP_401_UNAUTHORIZED, detail="Missing signature"
             )
-        expected = hmac.new(
-            config.webhook_secret.encode(), payload, hashlib.sha256
-        ).hexdigest()
+        expected = hmac.new(config.webhook_secret.encode(), payload, hashlib.sha256).hexdigest()
         if not hmac.compare_digest(x_nexus_webhook_signature, expected):
             log.warning("Webhook rejected: invalid signature")
             raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Invalid signature")
diff --git a/tests/conftest.py b/tests/conftest.py
index a62d0cb..e8ec2ee 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -23,7 +23,9 @@ from guarddog_nexus.main import app  # noqa: E402
 
 @pytest_asyncio.fixture
 async def db_engine():
-    engine = create_async_engine("sqlite+aiosqlite:///file:guarddog_test?mode=memory&cache=shared&uri=true")
+    engine = create_async_engine(
+        "sqlite+aiosqlite:///file:guarddog_test?mode=memory&cache=shared&uri=true"
+    )
     async with engine.begin() as conn:
         await conn.run_sync(Base.metadata.create_all)
     yield engine
@@ -76,29 +78,44 @@ def sample_nexus_webhook():
 @pytest.fixture
 def guarddog_output_clean():
     return {
-        "results": [],
-        "errors": [],
+        "package": "safe-pkg",
+        "issues": 0,
+        "errors": {},
+        "results": {
+            "obfuscation": {},
+            "exec-base64": {},
+            "shady-links": {},
+            "typosquatting": None,
+            "empty_information": None,
+        },
     }
 
 
 @pytest.fixture
 def guarddog_output_flagged():
     return {
-        "results": [
-            {
-                "rule": "shady-links",
-                "severity": "WARNING",
-                "message": "Package contains URL to suspicious domain",
-                "location": "setup.py:15",
-            },
-            {
-                "rule": "exec-base64",
-                "severity": "ERROR",
-                "message": "Base64-encoded code execution detected",
-                "location": "core.py:42",
-            },
-        ],
-        "errors": [],
+        "package": "bad-pkg",
+        "issues": 3,
+        "errors": {},
+        "results": {
+            "shady-links": [
+                {
+                    "message": "Package contains URL to suspicious domain",
+                    "location": "setup.py:15",
+                    "code": "url = 'http://evil.com'",
+                }
+            ],
+            "exec-base64": [
+                {
+                    "message": "Base64-encoded code execution detected",
+                    "location": "core.py:42",
+                    "code": "exec(base64.b64decode(...))",
+                }
+            ],
+            "empty_information": "Package description is empty",
+            "obfuscation": {},
+            "typosquatting": None,
+        },
     }
 
 
@@ -109,15 +126,21 @@ def guarddog_normalized_flagged():
             {
                 "rule": "shady-links",
                 "severity": "WARNING",
-                "message": "Suspicious URL",
+                "message": "Package contains URL to suspicious domain",
                 "location": "setup.py:15",
             },
             {
                 "rule": "exec-base64",
-                "severity": "ERROR",
-                "message": "Base64 exec",
+                "severity": "WARNING",
+                "message": "Base64-encoded code execution detected",
                 "location": "core.py:42",
             },
+            {
+                "rule": "empty_information",
+                "severity": "WARNING",
+                "message": "Package description is empty",
+                "location": "",
+            },
         ],
         "errors": [],
     }
diff --git a/tests/test_harvester.py b/tests/test_harvester.py
index 6611d77..a437c7b 100644
--- a/tests/test_harvester.py
+++ b/tests/test_harvester.py
@@ -34,7 +34,7 @@ async def test_harvest_new_package(db_session, guarddog_normalized_flagged):
     assert scan.ecosystem == "pypi"
     assert scan.status == "completed"
     assert scan.flagged is True
-    assert scan.total_findings == 2
+    assert scan.total_findings == 3
     assert scan.sha256 == "abc123"
 
     findings = (
@@ -42,7 +42,7 @@ async def test_harvest_new_package(db_session, guarddog_normalized_flagged):
         .scalars()
         .all()
     )
-    assert len(findings) == 2
+    assert len(findings) == 3
 
 
 @pytest.mark.asyncio
@@ -58,11 +58,17 @@ async def test_harvest_skips_duplicate(db_session, guarddog_normalized_flagged):
 
         first = await harvest(
             "http://nexus:8081/repo/pypi-proxy/packages/x/1.0/x-1.0.tar.gz",
-            "pypi-proxy", "pypi", "packages/x/1.0/x-1.0.tar.gz", db_session,
+            "pypi-proxy",
+            "pypi",
+            "packages/x/1.0/x-1.0.tar.gz",
+            db_session,
         )
         second = await harvest(
             "http://nexus:8081/repo/pypi-proxy/packages/x/1.0/x-1.0.tar.gz",
-            "pypi-proxy", "pypi", "packages/x/1.0/x-1.0.tar.gz", db_session,
+            "pypi-proxy",
+            "pypi",
+            "packages/x/1.0/x-1.0.tar.gz",
+            db_session,
         )
 
     assert first is not None
@@ -82,7 +88,10 @@ async def test_harvest_clean_package(db_session, guarddog_normalized_clean):
 
         scan = await harvest(
             "http://nexus:8081/repo/pypi-proxy/packages/django/4.2/django-4.2.tar.gz",
-            "pypi-proxy", "pypi", "packages/django/4.2/django-4.2.tar.gz", db_session,
+            "pypi-proxy",
+            "pypi",
+            "packages/django/4.2/django-4.2.tar.gz",
+            db_session,
         )
 
     assert scan is not None
@@ -97,7 +106,10 @@ async def test_harvest_download_failure(db_session):
 
         scan = await harvest(
             "http://nexus:8081/repo/pypi-proxy/packages/fail/1.0/fail-1.0.tar.gz",
-            "pypi-proxy", "pypi", "packages/fail/1.0/fail-1.0.tar.gz", db_session,
+            "pypi-proxy",
+            "pypi",
+            "packages/fail/1.0/fail-1.0.tar.gz",
+            db_session,
         )
 
     assert scan is not None
@@ -109,6 +121,9 @@ async def test_harvest_download_failure(db_session):
 async def test_harvest_skips_non_package_asset(db_session):
     scan = await harvest(
         "http://nexus:8081/repo/pypi-proxy/simple/index.html",
-        "pypi-proxy", "pypi", "simple/index.html", db_session,
+        "pypi-proxy",
+        "pypi",
+        "simple/index.html",
+        db_session,
     )
     assert scan is None
diff --git a/tests/test_scanner.py b/tests/test_scanner.py
index fbca2f3..39898fd 100644
--- a/tests/test_scanner.py
+++ b/tests/test_scanner.py
@@ -11,18 +11,41 @@ def test_normalize_clean_output(guarddog_output_clean):
 
 def test_normalize_flagged_output(guarddog_output_flagged):
     result = _normalize_output(guarddog_output_flagged)
-    assert len(result["findings"]) == 2
-    assert result["findings"][0]["rule"] == "shady-links"
-    assert result["findings"][0]["severity"] == "WARNING"
-    assert result["findings"][1]["rule"] == "exec-base64"
-    assert result["findings"][1]["severity"] == "ERROR"
+    assert len(result["findings"]) == 3
+    rules = {f["rule"] for f in result["findings"]}
+    assert "shady-links" in rules
+    assert "exec-base64" in rules
+    assert "empty_information" in rules
 
 
-def test_normalize_issues_format():
+def test_normalize_skips_null_and_empty_dicts():
     data = {
-        "issues": [{"id": "test-rule", "severity": "ERROR", "description": "Bad"}],
-        "errors": [],
+        "issues": 0,
+        "errors": {},
+        "results": {
+            "foo": None,
+            "bar": {},
+            "baz": "metadata finding",
+        },
     }
     result = _normalize_output(data)
     assert len(result["findings"]) == 1
-    assert result["findings"][0]["rule"] == "test-rule"
+    assert result["findings"][0]["rule"] == "baz"
+    assert result["findings"][0]["message"] == "metadata finding"
+
+
+def test_normalize_semgrep_list():
+    data = {
+        "issues": 2,
+        "errors": {},
+        "results": {
+            "code-execution": [
+                {"message": "Found exec()", "location": "setup.py:10", "severity": "ERROR"},
+                {"message": "Found eval()", "location": "core.py:5", "severity": "ERROR"},
+            ],
+        },
+    }
+    result = _normalize_output(data)
+    assert len(result["findings"]) == 2
+    assert result["findings"][0]["location"] == "setup.py:10"
+    assert result["findings"][0]["severity"] == "ERROR"