diff --git a/src/devx/ci/publish.py b/src/devx/ci/publish.py
index 38b51fa..abc9fd7 100644
--- a/src/devx/ci/publish.py
+++ b/src/devx/ci/publish.py
@@ -199,7 +199,7 @@ def is_release_commit(tag: str) -> bool:
 
 @click.command()
 @click.argument("tag", required=False)
-@click.argument("repo")
+@click.argument("repo", required=False)
 @click.option(
     "--registry-url",
     default=None,
@@ -223,11 +223,15 @@ def is_release_commit(tag: str) -> bool:
 )
 def main(
     tag: str | None,
-    repo: str,
+    repo: str | None,
     registry_url: str | None,
     skip_build: bool,
     from_tag: bool,
 ) -> None:
+    if repo is None:
+        repo = os.environ.get("GITHUB_REPOSITORY", "")
+    if not repo:
+        raise click.ClickException(_("REPO argument is required (or set GITHUB_REPOSITORY env var)."))
     if from_tag:
         detected_tag = get_latest_tag()
         if not detected_tag:
diff --git a/src/devx/translations.json b/src/devx/translations.json
index a5c64a4..26cbcf4 100644
--- a/src/devx/translations.json
+++ b/src/devx/translations.json
@@ -1135,6 +1135,14 @@
     "ru": "Tag is required (or use --from-tag).",
     "zh": "Tag is required (or use --from-tag)."
   },
+  "REPO argument is required (or set GITHUB_REPOSITORY env var).": {
+    "bg": "REPO argument is required (or set GITHUB_REPOSITORY env var).",
+    "de": "REPO argument is required (or set GITHUB_REPOSITORY env var).",
+    "en": "REPO argument is required (or set GITHUB_REPOSITORY env var).",
+    "pl": "Argument REPO jest wymagany (lub ustaw zmienną GITHUB_REPOSITORY).",
+    "ru": "REPO argument is required (or set GITHUB_REPOSITORY env var).",
+    "zh": "REPO argument is required (or set GITHUB_REPOSITORY env var)."
+  },
   "Tag v{version} already existed. Publish workflow should already have been triggered.": {
     "bg": "Tag v{version} already existed. Publish workflow should already have been triggered.",
     "de": "Tag v{version} already existed. Publish workflow should already have been triggered.",
diff --git a/tests/unit/test_publish.py b/tests/unit/test_publish.py
index 755c515..2169d25 100644
--- a/tests/unit/test_publish.py
+++ b/tests/unit/test_publish.py
@@ -475,6 +475,22 @@ class TestFromTag:
         assert result.exit_code == 0
         assert "No tag found" in result.output
 
+    @patch("devx.ci.publish.get_latest_tag", return_value=None)
+    def test_from_tag_no_repo_uses_env(self, _mock: MagicMock) -> None:
+        runner = CliRunner()
+        with patch.dict("os.environ", {"GITHUB_REPOSITORY": "owner/repo"}):
+            result = runner.invoke(main, ["--from-tag", "--skip-build"])
+        assert result.exit_code == 0
+        assert "No tag found" in result.output
+
+    @patch("devx.ci.publish.get_latest_tag", return_value=None)
+    def test_from_tag_no_repo_no_env_raises(self, _mock: MagicMock) -> None:
+        runner = CliRunner()
+        with patch.dict("os.environ", {}, clear=True):
+            result = runner.invoke(main, ["--from-tag", "--skip-build"])
+        assert result.exit_code != 0
+        assert "REPO argument is required" in result.output
+
     @patch("devx.ci.publish.is_release_commit", return_value=False)
     @patch("devx.ci.publish.get_latest_tag", return_value="v1.0.0")
     def test_from_tag_not_release_commit_skips(self, _mock_tag: MagicMock, _mock_rel: MagicMock) -> None:
@@ -497,6 +513,20 @@ class TestFromTag:
         assert result.exit_code == 0
         assert "Publishing release v1.0.0" in result.output
 
+    @patch("devx.ci.publish.is_release_commit", return_value=True)
+    @patch("devx.ci.publish.get_latest_tag", return_value="v1.0.0")
+    def test_from_tag_publishes_no_repo_arg(self, _mock_tag: MagicMock, _mock_rel: MagicMock) -> None:
+        with patch.dict("os.environ", {"REPO_TOKEN": "fake", "GITHUB_REPOSITORY": "owner/repo"}):
+            with patch("devx.ci.publish.TeaCLI") as mock_tea_cls:
+                mock_tea = MagicMock()
+                mock_tea.list_releases.return_value = []
+                mock_tea_cls.return_value = mock_tea
+                with patch("devx.ci.publish.generate_release_notes", return_value="notes"):
+                    runner = CliRunner()
+                    result = runner.invoke(main, ["--from-tag", "--skip-build"])
+        assert result.exit_code == 0
+        assert "Publishing release v1.0.0" in result.output
+
     def test_no_tag_no_from_tag_raises(self) -> None:
         runner = CliRunner()
         result = runner.invoke(main, ["", "owner/repo", "--skip-build"])