diff --git a/skills/last30days/SKILL.md b/skills/last30days/SKILL.md
index a7db05f..2b47dc0 100644
--- a/skills/last30days/SKILL.md
+++ b/skills/last30days/SKILL.md
@@ -327,6 +327,7 @@ Common patterns:
 - If SCRAPECREATORS_API_KEY is set and INCLUDE_SOURCES contains pinterest: add Pinterest
 - If BSKY_HANDLE and BSKY_APP_PASSWORD are set: add Bluesky
 - If OPENROUTER_API_KEY is set: add Perplexity
+- If EXCLUDE_SOURCES is set (comma-separated, case-insensitive): drop any matching source from the list above before displaying
 
 Then display (use "and more" if 5+ sources, otherwise list all with Oxford comma):
 
diff --git a/skills/last30days/scripts/lib/env.py b/skills/last30days/scripts/lib/env.py
index e78f012..81f5641 100644
--- a/skills/last30days/scripts/lib/env.py
+++ b/skills/last30days/scripts/lib/env.py
@@ -265,6 +265,7 @@ def get_config() -> dict[str, Any]:
         ('FROM_BROWSER', None),
         ('SETUP_COMPLETE', None),
         ('INCLUDE_SOURCES', ''),
+        ('EXCLUDE_SOURCES', ''),
     ]
 
     for key, default in keys:
diff --git a/tests/test_pipeline_v3.py b/tests/test_pipeline_v3.py
index 54dcc18..5ccddd1 100644
--- a/tests/test_pipeline_v3.py
+++ b/tests/test_pipeline_v3.py
@@ -956,5 +956,29 @@ class TestExcludeSources(unittest.TestCase):
         self.assertIn("reddit", sources)
 
 
+class TestExcludeSourcesEndToEnd(unittest.TestCase):
+    """Wiring regression: EXCLUDE_SOURCES from the process environment must
+    reach available_sources() via env.get_config(). The unit tests above
+    construct config dicts directly; this one exercises the env-to-config
+    path so a missing entry in env.py's keys list is caught immediately."""
+
+    def test_exclude_sources_from_env_propagates_through_get_config(self):
+        import os
+        from unittest.mock import patch as _patch
+        from lib import env as env_mod
+        from importlib import reload
+        with _patch.dict(os.environ, {
+            "LAST30DAYS_CONFIG_DIR": "",
+            "EXCLUDE_SOURCES": "tiktok,instagram",
+            "SCRAPECREATORS_API_KEY": "fake",
+        }, clear=False):
+            reload(env_mod)
+            cfg = env_mod.get_config()
+        self.assertEqual(cfg.get("EXCLUDE_SOURCES"), "tiktok,instagram")
+        sources = pipeline.available_sources(cfg)
+        self.assertNotIn("tiktok", sources)
+        self.assertNotIn("instagram", sources)
+
+
 if __name__ == "__main__":
     unittest.main()