diff --git a/tests/test_anthropic_compaction_transforms.py b/tests/test_anthropic_compaction_transforms.py
index f2f078eaa..5eb658924 100644
--- a/tests/test_anthropic_compaction_transforms.py
+++ b/tests/test_anthropic_compaction_transforms.py
@@ -114,13 +114,18 @@ class TestAnthropicToolDescCompactionTransforms:
     ``anthropic:tool_desc_compaction`` must appear in ``transforms_applied``."""
 
     def test_l2_appends_transform_label(self, monkeypatch: pytest.MonkeyPatch) -> None:
+        import headroom.proxy.tool_schema_compaction as _mod
         from headroom.proxy.tool_schema_compaction import (
             compact_tool_descriptions,
             tool_desc_max_chars,
         )
 
-        # Opt-in with a very short max so truncation triggers.
+        # Opt-in with a very short max so truncation triggers. Reset the
+        # per-process cache first: an earlier test in the shard may have read
+        # the (unset) env and pinned max_chars to 0, which would swallow our
+        # setenv below.
         monkeypatch.setenv("HEADROOM_TOOL_DESC_MAX_CHARS", "20")
+        _mod._TOOL_DESC_MAX_CHARS = None
 
         payload = _make_anthropic_payload_with_tools()
         max_chars = tool_desc_max_chars()
@@ -129,6 +134,8 @@ class TestAnthropicToolDescCompactionTransforms:
         body, modified, before, after = compact_tool_descriptions(payload, max_chars)
         assert modified is True
         assert before > after
+        # Don't leak the cached 20 into later tests in this shard.
+        _mod._TOOL_DESC_MAX_CHARS = None
 
     def test_l2_skips_label_when_disabled(self) -> None:
         import headroom.proxy.tool_schema_compaction as _mod
diff --git a/tests/test_proxy_dashboard_stats_cache.py b/tests/test_proxy_dashboard_stats_cache.py
index ece4c0ef7..484b4a55c 100644
--- a/tests/test_proxy_dashboard_stats_cache.py
+++ b/tests/test_proxy_dashboard_stats_cache.py
@@ -740,7 +740,9 @@ def test_dashboard_uses_cached_stats_and_lazy_history_feed_polling() -> None:
     assert "Lean-ctx" in html
     assert "Context Tool" in html
     assert "cliFilteringLabel + ' Filtered (this session)'" in html
-    assert "cliFilteringLabel + ' Filtered (lifetime)'" in html
+    # Lifetime CLI-filtering savings moved from the session card to the
+    # history tab as "Lifetime Saved" in #2198 (persist lifetime metrics).
+    assert "cliFilteringLabel) + ' Lifetime Saved'" in html
 
 
 def test_dashboard_session_metrics_do_not_repeat_proxy_tokens_without_new_context() -> None:
diff --git a/tests/test_transforms_content_router.py b/tests/test_transforms_content_router.py
index 3e478fc74..92dbea334 100644
--- a/tests/test_transforms_content_router.py
+++ b/tests/test_transforms_content_router.py
@@ -693,11 +693,14 @@ def test_smart_crusher_log_fallback_runs_for_valid_json(
 
     monkeypatch.setattr(router, "_get_smart_crusher", lambda: NoopSmartCrusher())
     monkeypatch.setattr(router, "_get_log_compressor", lambda: ShrinkingLogCompressor())
-    # Kompress no-op → Log fallback fires.
+    # Kompress no-op → Log fallback fires. A faithful no-op reports the same
+    # token count the router computed for the (unchanged) content — using
+    # _estimate_tokens, not a naive word split, so it isn't mistaken for a
+    # saving once #1857's whitespace-aware counting rates the JSON above 8.
     monkeypatch.setattr(
         router,
         "_try_ml_compressor",
-        lambda content, context, question=None: (content, len(content.split())),
+        lambda content, context, question=None: (content, _estimate_tokens(content)),
     )
 
     compressed, _compressed_tokens, strategy_chain = router._apply_strategy_to_content(