diff --git a/pyproject.toml b/pyproject.toml
index d0b0845b93..64703a0ac8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -153,6 +153,35 @@ huggingface = [
     "pyyaml",
     "nest-asyncio",
 ]
+huggingfacenotorch = [
+    "unsloth_zoo>=2026.7.6",
+    "wheel>=0.42.0",
+    "packaging",
+    "numpy",
+    "tqdm",
+    "psutil",
+    "tyro",
+    "protobuf",
+    "sentencepiece>=0.2.0",
+    "datasets>=3.4.1,!=4.0.*,!=4.1.0,<4.4.0",
+    "accelerate>=0.34.1",
+    "peft>=0.18.0,!=0.11.0",
+    "huggingface_hub>=0.34.0",
+    "hf_transfer",
+    "diffusers",
+    "transformers>=4.51.3,!=4.52.0,!=4.52.1,!=4.52.2,!=4.52.3,!=4.53.0,!=4.54.0,!=4.55.0,!=4.55.1,!=4.57.0,!=4.57.4,!=4.57.5,!=5.0.0,!=5.1.0,<=5.5.0",
+    "trl>=0.18.2,!=0.19.0,<=0.24.0",
+    "sentence-transformers",
+]
+amd = [
+    "unsloth[huggingfacenotorch]",
+    # 4-bit decode is unreliable on ROCm before 0.50.0, the first PyPI release
+    # carrying the full path: blocksize/warp decoupling (bnb #1887), fused SIMT
+    # GEMM on RDNA (#1979), RDNA3/4 workgroup fix (#2012). Keep in step with
+    # install.sh and studio/install_python_stack.py.
+    "bitsandbytes>=0.50.0 ; ('linux' in sys_platform) and (platform_machine == 'AMD64' or platform_machine == 'x86_64' or platform_machine == 'aarch64')",
+    "bitsandbytes>=0.50.0 ; (sys_platform == 'win32') and (platform_machine == 'AMD64' or platform_machine == 'x86_64')",
+]
 windows = [
     "unsloth[huggingface]",
     "bitsandbytes>=0.45.5,!=0.46.0,!=0.48.0 ; (sys_platform == 'win32')",
diff --git a/tests/python/test_pyproject_pypi_installable.py b/tests/python/test_pyproject_pypi_installable.py
new file mode 100644
index 0000000000..4fb5bc473d
--- /dev/null
+++ b/tests/python/test_pyproject_pypi_installable.py
@@ -0,0 +1,103 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved. See /studio/LICENSE.AGPL-3.0
+
+"""This branch is what gets uploaded to PyPI, so its metadata has to satisfy PyPI's rules.
+
+PyPI rejects any PEP 508 direct reference in ``Requires-Dist`` with
+``Invalid value for requires_dist. Error: Can't have direct dependency``
+(pypi/warehouse#7136), and ``twine check`` does not catch it beforehand
+(pypa/twine#726) -- the upload just 400s. ``main`` carries hundreds of direct URL
+requirements for the CUDA/XPU/ROCm wheel indexes, so every merge from ``main`` is a
+chance to import one here and break publishing. Nothing else guards that.
+
+Offline by design: structural checks only, no network.
+"""
+
+from __future__ import annotations
+
+import pathlib
+import re
+import sys
+
+import pytest
+
+REPO_ROOT = pathlib.Path(__file__).resolve().parents[2]
+PYPROJECT = REPO_ROOT / "pyproject.toml"
+
+_EXTRA_REF = re.compile(r"unsloth\[([\w\-\.,\s]+)\]")
+
+
+def _load() -> dict:
+    if sys.version_info >= (3, 11):
+        import tomllib
+    else:
+        tomllib = pytest.importorskip("tomli")
+    return tomllib.loads(PYPROJECT.read_text(encoding = "utf-8"))
+
+
+def _all_requirements() -> list[tuple[str, str]]:
+    """(extra name, requirement string) for the base deps and every extra."""
+    project = _load()["project"]
+    items = [("<base>", r) for r in project.get("dependencies", [])]
+    for extra, deps in project.get("optional-dependencies", {}).items():
+        items += [(extra, r) for r in deps]
+    return items
+
+
+class TestNoDirectUrlRequirements:
+    def test_no_requirement_uses_a_direct_url(self):
+        offenders = [
+            (extra, req)
+            for extra, req in _all_requirements()
+            if "@ http://" in req or "@ https://" in req or "@ git+" in req
+        ]
+        assert offenders == [], (
+            "PyPI rejects direct references in Requires-Dist, so these would fail the "
+            f"upload (only found at publish time): {offenders[:5]}"
+        )
+
+    def test_every_requirement_parses(self):
+        packaging_requirements = pytest.importorskip("packaging.requirements")
+        bad = []
+        for extra, req in _all_requirements():
+            try:
+                packaging_requirements.Requirement(req)
+            except Exception as exc:  # noqa: BLE001 - report every malformed spec at once
+                bad.append((extra, req, str(exc)))
+        assert bad == [], f"unparseable requirements: {bad}"
+
+
+class TestExtraReferencesResolve:
+    def test_every_unsloth_extra_reference_exists(self):
+        """A `unsloth[foo]` pointing at an extra this branch does not define installs
+        nothing and fails silently, which is how a partially ported extras block breaks."""
+        extras = _load()["project"].get("optional-dependencies", {})
+        dangling = []
+        for name, deps in extras.items():
+            for dep in deps:
+                for match in _EXTRA_REF.finditer(dep):
+                    for ref in match.group(1).split(","):
+                        ref = ref.strip()
+                        if ref and ref not in extras:
+                            dangling.append((name, ref))
+        assert dangling == [], f"extras referencing undefined extras: {dangling}"
+
+
+class TestAmdExtraIsInstallableFromPyPI:
+    """`pip install unsloth[amd]` is the supported AMD entry point, so the extra has to
+    exist here and stay a version floor -- a URL pin would be unpublishable."""
+
+    def test_amd_extra_exists_and_floors_bitsandbytes(self):
+        extras = _load()["project"].get("optional-dependencies", {})
+        assert "amd" in extras, "pyproject.toml must define an `amd` extra"
+        specs = [d for d in extras["amd"] if d.lower().startswith("bitsandbytes")]
+        assert specs, "the amd extra must constrain bitsandbytes"
+        for spec in specs:
+            assert spec.startswith("bitsandbytes>=0.50.0"), (
+                f"bitsandbytes <= 0.49.2 NaNs at 4-bit decode on ROCm; got {spec!r}"
+            )
+
+    def test_amd_extra_pulls_the_torch_free_runtime(self):
+        extras = _load()["project"].get("optional-dependencies", {})
+        assert any("huggingfacenotorch" in d for d in extras["amd"])
+        assert "huggingfacenotorch" in extras