fix(shell): hide context usage until warning threshold

src/kimi_cli/ui/shell/prompt.py

@@ -884,6 +884,7 @@ def __bool__(self) -> bool:
 _GIT_BRANCH_TTL = 5.0
 _GIT_STATUS_TTL = 15.0
 _TIP_ROTATE_INTERVAL = 30.0
+_CONTEXT_USAGE_WARNING_THRESHOLD = 0.80
 _MAX_CWD_COLS = 30
 _MAX_BRANCH_COLS = 22
 
@@ -2204,7 +2205,7 @@ def _render_bottom_toolbar(self) -> FormattedText:
         if tip_text and _display_width(tip_text) <= remaining:
             fragments.append((tc.tip, tip_text))
 
-        # ── line 2: toast (left) + context (right) — always rendered ──────
+        # ── line 2: toast (left) + optional warning/status text (right) ──────
         fragments.append(("", "\n"))
 
         right_text = self._render_right_span(status)
@@ -2224,8 +2225,9 @@ def _render_bottom_toolbar(self) -> FormattedText:
         else:
             left_width = 0
 
-        fragments.append(("", " " * max(0, columns - left_width - right_width)))
-        fragments.append(("", right_text))
+        if right_text:
+            fragments.append(("", " " * max(0, columns - left_width - right_width)))
+            fragments.append(("", right_text))
 
         return FormattedText(fragments)
 
@@ -2250,10 +2252,12 @@ def _get_one_rotating_tip(self) -> str | None:
     @staticmethod
     def _render_right_span(status: StatusSnapshot) -> str:
         current_toast = _current_toast("right")
-        if current_toast is None:
-            return format_context_status(
-                status.context_usage,
-                status.context_tokens,
-                status.max_context_tokens,
-            )
-        return current_toast.message
+        if current_toast is not None:
+            return current_toast.message
+        if status.context_usage < _CONTEXT_USAGE_WARNING_THRESHOLD:
+            return ""
+        return format_context_status(
+            status.context_usage,
+            status.context_tokens,
+            status.max_context_tokens,
+        )

tests/ui_and_conv/test_prompt_tips.py

@@ -434,12 +434,30 @@ def test_mode_drops_model_name_and_dot_on_very_narrow_terminal(monkeypatch: Any)
 # ── Line 2 structural correctness ─────────────────────────────────────────────
 
 
-def test_toolbar_line2_context_appears_on_line2_not_line1(monkeypatch: Any) -> None:
+def test_toolbar_line2_hides_context_below_warning_threshold(monkeypatch: Any) -> None:
     prompt_session = _make_toolbar_session(tips=[])
+    prompt_session._status_provider = lambda: StatusSnapshot(
+        context_usage=0.42,
+        context_tokens=3_000,
+        max_context_tokens=10_000,
+    )
+    lines = _render_toolbar_lines(prompt_session, 80, monkeypatch)
+
+    assert "context:" not in lines[2]
+    assert "context:" not in lines[1]
+
+
+def test_toolbar_line2_context_appears_at_warning_threshold(monkeypatch: Any) -> None:
+    prompt_session = _make_toolbar_session(tips=[])
+    prompt_session._status_provider = lambda: StatusSnapshot(
+        context_usage=0.80,
+        context_tokens=8_000,
+        max_context_tokens=10_000,
+    )
     lines = _render_toolbar_lines(prompt_session, 80, monkeypatch)
 
-    assert "context: 0.0%" in lines[2]
-    assert "context: 0.0%" not in lines[1]
+    assert "context: 80.0% (8k/10k)" in lines[2]
+    assert "context: 80.0% (8k/10k)" not in lines[1]
 
 
 def test_toolbar_line2_left_toast_appears_on_line2_not_line1(monkeypatch: Any) -> None:
@@ -619,7 +637,7 @@ def get_size() -> Any:
     rendered_toolbar = prompt_session._render_bottom_toolbar()
     plain_toolbar = "".join(fragment[1] for fragment in rendered_toolbar)
     assert "tip" in plain_toolbar
-    assert "context: 0.0%" in plain_toolbar
+    assert "context:" not in plain_toolbar
 
 
 def test_modal_prompt_hides_normal_separator_and_prompt_label(monkeypatch) -> None: