feat: add kill_ring_system_clipboard config option

CHANGELOG.md

@@ -11,6 +11,8 @@ Only write entries that are worth mentioning to users.
 
 ## Unreleased
 
+- Config: Add `kill_ring_system_clipboard` option — set to `false` to keep emacs-style kill commands (`Ctrl-W`, `Ctrl-K`, `Ctrl-U`, etc.) in an in-memory kill ring instead of overwriting the system clipboard
+
 ## 1.43.0 (2026-05-12)
 
 - Security: Bump pillow to 12.2.0 to address CVE-2026-25990 (out-of-bounds write when loading PSD images); unblocks installs in environments that gate on the older pinned version

docs/en/configuration/config-files.md

@@ -34,6 +34,7 @@ The configuration file contains the following top-level configuration items:
 | `show_thinking_stream` | `boolean` | Whether to stream the raw reasoning text in the live area as a 6-line scrolling preview and commit the full reasoning markdown to history when the block ends (defaults to `true`; set to `false` to show only the compact `Thinking ...` indicator and a one-line trace summary) |
 | `merge_all_available_skills` | `boolean` | Whether to merge skills from all brand directories (defaults to `true`); see [Skills configuration](../customization/skills.md) |
 | `telemetry` | `boolean` | Whether to enable anonymous telemetry to help improve kimi-cli (defaults to `true`; set to `false` to disable) |
+| `kill_ring_system_clipboard` | `boolean` | Whether emacs-style kill commands (Ctrl-W, Ctrl-K, etc.) write to the system clipboard (defaults to `true`; set to `false` to use an in-memory kill ring) |
 | `providers` | `table` | API provider configuration |
 | `models` | `table` | Model configuration |
 | `loop_control` | `table` | Agent loop control parameters |
@@ -54,6 +55,7 @@ theme = "dark"
 show_thinking_stream = true
 merge_all_available_skills = true
 telemetry = true
+kill_ring_system_clipboard = true
 
 [providers.kimi-for-coding]
 type = "kimi"

docs/en/release-notes/changelog.md

@@ -4,6 +4,8 @@ This page documents the changes in each Kimi Code CLI release.
 
 ## Unreleased
 
+- Config: Add `kill_ring_system_clipboard` option — set to `false` to keep emacs-style kill commands (`Ctrl-W`, `Ctrl-K`, `Ctrl-U`, etc.) in an in-memory kill ring instead of overwriting the system clipboard
+
 ## 1.43.0 (2026-05-12)
 
 - Security: Bump pillow to 12.2.0 to address CVE-2026-25990 (out-of-bounds write when loading PSD images); unblocks installs in environments that gate on the older pinned version

docs/zh/configuration/config-files.md

@@ -34,6 +34,7 @@ kimi --config '{"default_model": "kimi-for-coding", "providers": {...}, "models"
 | `show_thinking_stream` | `boolean` | 是否在 Live 区域以 6 行滚动预览方式实时展示模型的原始思考文本，并在 thinking 块结束时把完整思考内容（Markdown）写入历史记录（默认为 `true`；设为 `false` 则仅显示紧凑的 `Thinking ...` 指示器和一行 trace 总结） |
 | `merge_all_available_skills` | `boolean` | 是否合并所有品牌目录中的 Skills（默认为 `true`）；详见 [Skills 配置](../customization/skills.md) |
 | `telemetry` | `boolean` | 是否启用匿名遥测以帮助改进 kimi-cli（默认为 `true`；设为 `false` 可关闭） |
+| `kill_ring_system_clipboard` | `boolean` | Emacs 风格的删除命令（Ctrl-W、Ctrl-K 等）是否写入系统剪贴板（默认为 `true`；设为 `false` 则使用内存 kill ring） |
 | `providers` | `table` | API 供应商配置 |
 | `models` | `table` | 模型配置 |
 | `loop_control` | `table` | Agent 循环控制参数 |
@@ -54,6 +55,7 @@ theme = "dark"
 show_thinking_stream = true
 merge_all_available_skills = true
 telemetry = true
+kill_ring_system_clipboard = true
 
 [providers.kimi-for-coding]
 type = "kimi"

docs/zh/release-notes/changelog.md

@@ -4,6 +4,8 @@
 
 ## 未发布
 
+- Config：新增 `kill_ring_system_clipboard` 配置项——设为 `false` 时，Emacs 风格的删除命令（`Ctrl-W`、`Ctrl-K`、`Ctrl-U` 等）将使用内存 kill ring，不再覆盖系统剪贴板
+
 ## 1.43.0 (2026-05-12)
 
 - Security：将 pillow 升级到 12.2.0 以修复 CVE-2026-25990（加载 PSD 图像时存在越界写入）；解除在依赖审查严格的环境下因旧版本被阻断而无法安装的限制

src/kimi_cli/config.py

@@ -262,6 +262,16 @@ class Config(BaseModel):
         default=True,
         description="Enable anonymous telemetry to help improve kimi-cli. Set to false to disable.",
     )
+    kill_ring_system_clipboard: bool = Field(
+        default=True,
+        description=(
+            "When true (default), emacs-style kill commands (Ctrl-W, Ctrl-K, etc.) "
+            "write deleted text to the system clipboard. When false, deleted text "
+            "is discarded and does not pollute the system clipboard. "
+            "Intentional cut/copy/paste (Ctrl-W with selection, Alt-W, Ctrl-Y, Ctrl-V) "
+            "continue to use the system clipboard regardless of this setting."
+        ),
+    )
 
     @model_validator(mode="after")
     def validate_model(self) -> Self:

src/kimi_cli/ui/shell/__init__.py

@@ -469,6 +469,11 @@ def _bg_task_counts() -> BgTaskCounts:
                 self.soul.runtime.config.default_editor if isinstance(self.soul, KimiSoul) else ""
             ),
             plan_mode_toggle_callback=_plan_mode_toggle,
+            kill_ring_system_clipboard=(
+                self.soul.runtime.config.kill_ring_system_clipboard
+                if isinstance(self.soul, KimiSoul)
+                else True
+            ),
         ) as prompt_session:
             self._prompt_session = prompt_session
             if self._prefill_text:

src/kimi_cli/ui/shell/prompt.py

@@ -32,7 +32,7 @@
 )
 from prompt_toolkit.data_structures import Point
 from prompt_toolkit.document import Document
-from prompt_toolkit.filters import Condition, has_completions, has_focus, is_done
+from prompt_toolkit.filters import Condition, has_completions, has_focus, has_selection, is_done
 from prompt_toolkit.formatted_text import AnyFormattedText, FormattedText, to_formatted_text
 from prompt_toolkit.history import InMemoryHistory
 from prompt_toolkit.key_binding import KeyBindings, KeyPressEvent
@@ -1185,6 +1185,7 @@ def __init__(
         shell_mode_slash_commands: Sequence[SlashCommand[Any]],
         editor_command_provider: Callable[[], str] = lambda: "",
         plan_mode_toggle_callback: Callable[[], Awaitable[bool]] | None = None,
+        kill_ring_system_clipboard: bool = True,
     ) -> None:
         history_dir = get_share_dir() / "user-history"
         history_dir.mkdir(parents=True, exist_ok=True)
@@ -1215,6 +1216,7 @@ def __init__(
         self._prompt_buffer_container: ConditionalContainer | None = None
         self._last_ui_state: PromptUIState = PromptUIState.NORMAL_INPUT
         self._suspended_buffer_document: Document | None = None
+        self._kill_ring_system_clipboard = kill_ring_system_clipboard
         clipboard_available = is_clipboard_available()
         media_clipboard_available = is_media_clipboard_available()
         self._tips = _build_toolbar_tips(clipboard_available or media_clipboard_available)
@@ -1496,6 +1498,71 @@ def _(event: KeyPressEvent) -> None:
                     self._insert_pasted_text(event.current_buffer, clipboard_data.text)
                     event.app.invalidate()
 
+        # Override built-in kill bindings so they don't pollute the system
+        # clipboard when the user has disabled kill-ring-to-system-clipboard.
+        if not self._kill_ring_system_clipboard:
+
+            @_kb.add("c-w", eager=True, filter=~has_selection)
+            def _(event: KeyPressEvent) -> None:
+                """Unix-word-rubout without system clipboard."""
+                buffer = event.current_buffer
+                pos = buffer.document.find_start_of_previous_word(count=event.arg, WORD=True)
+                if pos is None:
+                    pos = -buffer.cursor_position
+                if pos:
+                    buffer.delete_before_cursor(count=-pos)
+                else:
+                    event.app.output.bell()
+
+            @_kb.add("c-k", eager=True)
+            def _(event: KeyPressEvent) -> None:
+                """Kill-line without system clipboard."""
+                buff = event.current_buffer
+                if event.arg < 0:
+                    buff.delete_before_cursor(count=-buff.document.get_start_of_line_position())
+                else:
+                    if buff.document.current_char == "\n":
+                        buff.delete(1)
+                    else:
+                        buff.delete(count=buff.document.get_end_of_line_position())
+
+            @_kb.add("c-u", eager=True)
+            def _(event: KeyPressEvent) -> None:
+                """Unix-line-discard without system clipboard."""
+                buff = event.current_buffer
+                if buff.document.cursor_position_col == 0 and buff.document.cursor_position > 0:
+                    buff.delete_before_cursor(count=1)
+                else:
+                    buff.delete_before_cursor(count=-buff.document.get_start_of_line_position())
+
+            @_kb.add("c-delete", eager=True)
+            def _(event: KeyPressEvent) -> None:
+                """Kill-word (forward) without system clipboard."""
+                buff = event.current_buffer
+                pos = buff.document.find_next_word_ending(count=event.arg)
+                if pos:
+                    buff.delete(count=pos)
+
+            @_kb.add("escape", "d", eager=True)
+            def _(event: KeyPressEvent) -> None:
+                """Meta-D: kill-word (forward) without system clipboard."""
+                buff = event.current_buffer
+                pos = buff.document.find_next_word_ending(count=event.arg)
+                if pos:
+                    buff.delete(count=pos)
+
+            @_kb.add("escape", "backspace", eager=True)
+            def _(event: KeyPressEvent) -> None:
+                """Meta-Backspace: backward-kill-word without system clipboard."""
+                buffer = event.current_buffer
+                pos = buffer.document.find_start_of_previous_word(count=event.arg)
+                if pos is None:
+                    pos = -buffer.cursor_position
+                if pos:
+                    buffer.delete_before_cursor(count=-pos)
+                else:
+                    event.app.output.bell()
+
         # Only use PyperclipClipboard when pyperclip actually works.
         # PromptSession built-in keybindings (ctrl-k, ctrl-w, ctrl-y)
         # use clipboard without error handling, so a broken clipboard