diff --git a/pyproject.toml b/pyproject.toml
index 8f6832b..45b8eca 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "twitter-cli"
-version = "0.4.1"
+version = "0.4.2"
 description = "A CLI for Twitter/X — feed, bookmarks, and user timeline in terminal"
 readme = "README.md"
 license = "Apache-2.0"
diff --git a/tests/test_client.py b/tests/test_client.py
index a707a37..d31ba38 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -176,6 +176,23 @@ class TestBuildGraphqlUrl:
         url = _build_graphql_url("x", "Op", {}, {}, {"toggle": True})
         assert "fieldToggles=" in url
 
+    def test_false_features_omitted_from_url(self):
+        """False-valued features should be omitted to keep URL short (avoid 414)."""
+        features = {"enabled_flag": True, "disabled_flag": False, "another_enabled": True}
+        url = _build_graphql_url("q", "Op", {}, features)
+        assert "enabled_flag" in url
+        assert "another_enabled" in url
+        assert "disabled_flag" not in url
+
+    def test_url_length_with_full_features(self):
+        """URL with full FEATURES dict should stay under 8000 chars (server limit)."""
+        url = _build_graphql_url(
+            "abc123", "SearchTimeline",
+            {"rawQuery": "AI agent", "querySource": "typed_query", "product": "Latest", "count": 50},
+            FEATURES,
+        )
+        assert len(url) < 8000, f"URL too long: {len(url)} chars"
+
 
 # ── _best_chrome_target ──────────────────────────────────────────────────
 
diff --git a/twitter_cli/client.py b/twitter_cli/client.py
index 3cb9848..de10d0e 100644
--- a/twitter_cli/client.py
+++ b/twitter_cli/client.py
@@ -164,12 +164,18 @@ def _url_fetch(url, headers=None):
 
 def _build_graphql_url(query_id, operation_name, variables, features, field_toggles=None):
     # type: (str, str, Dict[str, Any], Dict[str, Any], Optional[Dict[str, Any]]) -> str
-    """Build GraphQL GET URL with encoded variables/features/fieldToggles."""
+    """Build GraphQL GET URL with encoded variables/features/fieldToggles.
+
+    Only includes True-valued feature flags in the URL to avoid 414 URI Too Long.
+    Twitter's API defaults missing features to False.
+    """
+    # Compact features: omit False values to keep URL under server limits
+    compact_features = {k: v for k, v in features.items() if v is not False}
     url = "https://x.com/i/api/graphql/%s/%s?variables=%s&features=%s" % (
         query_id,
         operation_name,
         urllib.parse.quote(json.dumps(variables, separators=(",", ":"))),
-        urllib.parse.quote(json.dumps(features, separators=(",", ":"))),
+        urllib.parse.quote(json.dumps(compact_features, separators=(",", ":"))),
     )
     if field_toggles:
         url += "&fieldToggles=%s" % urllib.parse.quote(
diff --git a/uv.lock b/uv.lock
index 21eec6a..fe72ff6 100644
--- a/uv.lock
+++ b/uv.lock
@@ -950,7 +950,7 @@ wheels = [
 
 [[package]]
 name = "twitter-cli"
-version = "0.4.0"
+version = "0.4.1"
 source = { editable = "." }
 dependencies = [
     { name = "beautifulsoup4" },