diff --git a/frontend-web/src/components/workspace/artifacts/artifact-file-detail.tsx b/frontend-web/src/components/workspace/artifacts/artifact-file-detail.tsx
index eea8d2a3..c45a68a6 100644
--- a/frontend-web/src/components/workspace/artifacts/artifact-file-detail.tsx
+++ b/frontend-web/src/components/workspace/artifacts/artifact-file-detail.tsx
@@ -2,15 +2,16 @@
 
 import {
   ArrowDownIcon,
-  Code2Icon,
-  CopyIcon,
-  DownloadIcon,
-  EyeIcon,
-  LoaderIcon,
-  PackageIcon,
-  SquareArrowOutUpRightIcon,
-  XIcon,
-} from "lucide-react";
+  Code2Icon,
+  CopyIcon,
+  DownloadIcon,
+  EyeIcon,
+  LoaderIcon,
+  PackageIcon,
+  SaveIcon,
+  SquareArrowOutUpRightIcon,
+  XIcon,
+} from "lucide-react";
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { toast } from "sonner";
 import { Streamdown } from "streamdown";
@@ -33,11 +34,14 @@ import {
 import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group";
 import { CodeEditor } from "@/components/workspace/code-editor";
 import { apiFetch } from "@/core/api";
-import {
-  downloadArtifactFile,
-  openArtifactInNewTab,
-} from "@/core/artifacts/download";
-import { useArtifactContent } from "@/core/artifacts/hooks";
+import {
+  downloadArtifactFile,
+  openArtifactInNewTab,
+} from "@/core/artifacts/download";
+import {
+  useArtifactContent,
+  useUpdateArtifactContent,
+} from "@/core/artifacts/hooks";
 import { urlOfArtifact } from "@/core/artifacts/utils";
 import { useI18n } from "@/core/i18n/hooks";
 import { installSkill } from "@/core/skills/api";
@@ -113,13 +117,18 @@ export function ArtifactFileDetail({
   const isSupportPreview = useMemo(() => {
     return language === "html" || language === "markdown";
   }, [language]);
-  const { content } = useArtifactContent({
-    threadId,
-    filepath: filepathFromProps,
-    enabled: isCodeFile && !isWriteFile,
-  });
-
-  const displayContent = content ?? "";
+  const { content, isApplyingEdit } = useArtifactContent({
+    threadId,
+    filepath: filepathFromProps,
+    enabled: isCodeFile && !isWriteFile,
+  });
+
+  const canEditArtifact =
+    language === "markdown" && !isWriteFile && !isSkillFile && !isMock;
+  const [draftContent, setDraftContent] = useState("");
+  const [hasLocalEdits, setHasLocalEdits] = useState(false);
+  const updateArtifact = useUpdateArtifactContent();
+  const displayContent = canEditArtifact ? draftContent : (content ?? "");
   const isHtmlStreaming = language === "html" && thread.isLoading;
   const hasMultipleArtifacts = (artifacts?.length ?? 0) > 1;
   const fileTypeLabel = useMemo(() => {
@@ -139,8 +148,20 @@ export function ArtifactFileDetail({
   const [binaryPreviewUrl, setBinaryPreviewUrl] = useState<string | null>(
     null,
   );
-  const artifactContentRef = useRef<HTMLDivElement | null>(null);
-  const resumeButtonTimeoutRef = useRef<number | null>(null);
+  const artifactContentRef = useRef<HTMLDivElement | null>(null);
+  const resumeButtonTimeoutRef = useRef<number | null>(null);
+
+  useEffect(() => {
+    setDraftContent(content ?? "");
+    setHasLocalEdits(false);
+  }, [filepathFromProps]);
+
+  useEffect(() => {
+    if (!canEditArtifact || hasLocalEdits) {
+      return;
+    }
+    setDraftContent(content ?? "");
+  }, [canEditArtifact, content, hasLocalEdits]);
 
   useEffect(() => {
     setAllowAutoViewSwitch(true);
@@ -308,7 +329,7 @@ export function ArtifactFileDetail({
     }, 1600);
   }, [scrollArtifactToBottom]);
 
-  const handleInstallSkill = useCallback(async () => {
+  const handleInstallSkill = useCallback(async () => {
     if (isInstalling) return;
 
     setIsInstalling(true);
@@ -328,7 +349,33 @@ export function ArtifactFileDetail({
     } finally {
       setIsInstalling(false);
     }
-  }, [threadId, filepath, isInstalling]);
+  }, [threadId, filepath, isInstalling]);
+
+  const handleSaveArtifact = useCallback(async () => {
+    if (!canEditArtifact || updateArtifact.isPending) {
+      return;
+    }
+    try {
+      await updateArtifact.mutateAsync({
+        filepath,
+        threadId,
+        isMock,
+        content: draftContent,
+      });
+      setHasLocalEdits(false);
+      toast.success("Markdown 已保存");
+    } catch (error) {
+      console.error("Failed to save artifact:", error);
+      toast.error(error instanceof Error ? error.message : "Markdown 保存失败");
+    }
+  }, [
+    canEditArtifact,
+    draftContent,
+    filepath,
+    isMock,
+    threadId,
+    updateArtifact,
+  ]);
 
   return (
     <Artifact className={cn(className)}>
@@ -405,10 +452,19 @@ export function ArtifactFileDetail({
             </div>
           )}
         </div>
-        <div className="flex items-center justify-end gap-2">
-          <ArtifactActions className="bg-muted/45 rounded-full border border-black/6 p-1 dark:border-white/8">
-            {!isWriteFile && filepath.endsWith(".skill") && (
-              <Tooltip content={t.toolCalls.skillInstallTooltip}>
+        <div className="flex items-center justify-end gap-2">
+          <ArtifactActions className="bg-muted/45 rounded-full border border-black/6 p-1 dark:border-white/8">
+            {canEditArtifact && (
+              <ArtifactAction
+                icon={updateArtifact.isPending ? LoaderIcon : SaveIcon}
+                label="保存 Markdown"
+                tooltip={hasLocalEdits ? "保存 Markdown 修改" : "Markdown 已保存"}
+                disabled={!hasLocalEdits || updateArtifact.isPending}
+                onClick={handleSaveArtifact}
+              />
+            )}
+            {!isWriteFile && filepath.endsWith(".skill") && (
+              <Tooltip content={t.toolCalls.skillInstallTooltip}>
                 <ArtifactAction
                   icon={isInstalling ? LoaderIcon : PackageIcon}
                   label={t.common.install}
@@ -494,13 +550,19 @@ export function ArtifactFileDetail({
           </ArtifactActions>
         </div>
       </ArtifactHeader>
-      <ArtifactContent
-        ref={artifactContentRef}
-        className="relative p-0"
-        onWheelCapture={handlePauseAutoScroll}
-      >
-        {showResumeAutoScroll && (
-          <button
+      <ArtifactContent
+        ref={artifactContentRef}
+        className="relative p-0"
+        onWheelCapture={handlePauseAutoScroll}
+      >
+        {isApplyingEdit && (
+          <div className="absolute right-4 bottom-4 z-20 inline-flex items-center gap-2 rounded-full border border-[#d8b878] bg-[#fff3cf]/95 px-3 py-1.5 text-xs text-[#6d5625] shadow-sm">
+            <span className="h-3.5 w-0.5 animate-pulse rounded-full bg-[#9b7a2f]" />
+            正在改写 Markdown
+          </div>
+        )}
+        {showResumeAutoScroll && (
+          <button
             type="button"
             onClick={handleResumeAutoScroll}
             className="animate-[sandbox-scroll-button-in_220ms_ease-out] absolute inset-x-0 top-1/2 z-20 mx-auto flex w-fit -translate-y-1/2 items-center gap-2 rounded-full border border-white/35 bg-black/28 px-4 py-2 text-sm font-medium text-white shadow-[0_20px_40px_-24px_rgba(15,23,42,0.7)] backdrop-blur-md transition hover:bg-black/40"
@@ -512,21 +574,31 @@ export function ArtifactFileDetail({
         {isSupportPreview &&
           viewMode === "preview" &&
           (language === "markdown" || language === "html") && (
-            <ArtifactFilePreview
-              content={displayContent}
-              language={language ?? "text"}
-              animated={showPreviewSwitchPulse}
-            />
-          )}
+              <ArtifactFilePreview
+                content={displayContent}
+                language={language ?? "text"}
+                animated={showPreviewSwitchPulse}
+                activeCursor={isApplyingEdit}
+              />
+            )}
         {isCodeFile && viewMode === "code" && (
           <div className="size-full">
-            <CodeEditor
-              className="size-full resize-none rounded-none border-none bg-transparent"
-              value={displayContent ?? ""}
-              readonly
-            />
-          </div>
-        )}
+            <CodeEditor
+              className="size-full resize-none rounded-none border-none bg-transparent"
+              value={displayContent ?? ""}
+              readonly={!canEditArtifact}
+              onChange={
+                canEditArtifact
+                  ? (value) => {
+                      setDraftContent(value);
+                      setHasLocalEdits(true);
+                    }
+                  : undefined
+              }
+              streamingReadonlyFallback={!canEditArtifact}
+            />
+          </div>
+        )}
         {!isCodeFile &&
           (binaryPreviewUrl ? (
             <iframe className="size-full bg-white" src={binaryPreviewUrl} />
@@ -541,15 +613,17 @@ export function ArtifactFileDetail({
   );
 }
 
-export function ArtifactFilePreview({
-  content,
-  language,
-  animated = false,
-}: {
-  content: string;
-  language: string;
-  animated?: boolean;
-}) {
+export function ArtifactFilePreview({
+  content,
+  language,
+  animated = false,
+  activeCursor = false,
+}: {
+  content: string;
+  language: string;
+  animated?: boolean;
+  activeCursor?: boolean;
+}) {
   const [htmlPreviewUrl, setHtmlPreviewUrl] = useState<string>();
 
   useEffect(() => {
@@ -580,12 +654,15 @@ export function ArtifactFilePreview({
           className="size-full"
           {...streamdownPlugins}
           components={{ a: ArtifactLink }}
-        >
-          {content ?? ""}
-        </Streamdown>
-      </div>
-    );
-  }
+        >
+          {content ?? ""}
+        </Streamdown>
+        {activeCursor && (
+          <span className="mt-2 inline-block h-5 w-0.5 animate-pulse rounded-full bg-[#9b7a2f]" />
+        )}
+      </div>
+    );
+  }
 
   if (language === "html") {
     return (
diff --git a/frontend-web/src/components/workspace/code-editor.tsx b/frontend-web/src/components/workspace/code-editor.tsx
index d6188ae0..ab772faa 100644
--- a/frontend-web/src/components/workspace/code-editor.tsx
+++ b/frontend-web/src/components/workspace/code-editor.tsx
@@ -34,23 +34,27 @@ const customLightTheme = basicLightInit({
   },
 });
 
-export function CodeEditor({
-  className,
-  placeholder,
-  value,
-  readonly,
-  disabled,
-  autoFocus,
-  settings,
-}: {
-  className?: string;
-  placeholder?: string;
-  value: string;
-  readonly?: boolean;
-  disabled?: boolean;
-  autoFocus?: boolean;
-  settings?: unknown;
-}) {
+export function CodeEditor({
+  className,
+  placeholder,
+  value,
+  onChange,
+  readonly,
+  disabled,
+  autoFocus,
+  settings,
+  streamingReadonlyFallback = true,
+}: {
+  className?: string;
+  placeholder?: string;
+  value: string;
+  onChange?: (value: string) => void;
+  readonly?: boolean;
+  disabled?: boolean;
+  autoFocus?: boolean;
+  settings?: unknown;
+  streamingReadonlyFallback?: boolean;
+}) {
   const {
     thread: { isLoading },
   } = useThread();
@@ -77,8 +81,8 @@ export function CodeEditor({
         className,
       )}
     >
-      {isLoading ? (
-        <Textarea
+      {isLoading && streamingReadonlyFallback ? (
+        <Textarea
           className={cn(
             "h-full overflow-auto font-mono [&_.cm-editor]:h-full [&_.cm-focused]:outline-none!",
             "resize-none p-4! [&_.cm-line]:px-2! [&_.cm-line]:py-0!",
@@ -105,10 +109,11 @@ export function CodeEditor({
             lineNumbers:
               (settings as { lineNumbers?: boolean })?.lineNumbers ?? false,
           }}
-          autoFocus={autoFocus}
-          value={value}
-        />
-      )}
+          autoFocus={autoFocus}
+          value={value}
+          onChange={onChange}
+        />
+      )}
     </div>
   );
 }
diff --git a/frontend-web/src/components/workspace/input-box.tsx b/frontend-web/src/components/workspace/input-box.tsx
index 85dc3dd4..ccfe6555 100644
--- a/frontend-web/src/components/workspace/input-box.tsx
+++ b/frontend-web/src/components/workspace/input-box.tsx
@@ -2,8 +2,9 @@
 
 import type { ChatStatus } from "ai";
 import {
-  CheckIcon,
-  GraduationCapIcon,
+  CheckIcon,
+  FileTextIcon,
+  GraduationCapIcon,
   LightbulbIcon,
   PaperclipIcon,
   PlusIcon,
@@ -122,9 +123,10 @@ export function InputBox({
     AgentThreadContext,
     "thread_id" | "is_plan_mode" | "thinking_enabled" | "subagent_enabled"
   > & {
-    mode: "flash" | "thinking" | "pro" | "ultra" | undefined;
-    reasoning_effort?: "minimal" | "low" | "medium" | "high";
-  };
+    mode: "flash" | "thinking" | "pro" | "ultra" | undefined;
+    reasoning_effort?: "minimal" | "low" | "medium" | "high";
+    writing_mode?: boolean;
+  };
   extraHeader?: React.ReactNode;
   isNewThread?: boolean;
   threadId: string;
@@ -134,10 +136,11 @@ export function InputBox({
       AgentThreadContext,
       "thread_id" | "is_plan_mode" | "thinking_enabled" | "subagent_enabled"
     > & {
-      mode: "flash" | "thinking" | "pro" | "ultra" | undefined;
-      reasoning_effort?: "minimal" | "low" | "medium" | "high";
-    },
-  ) => void;
+      mode: "flash" | "thinking" | "pro" | "ultra" | undefined;
+      reasoning_effort?: "minimal" | "low" | "medium" | "high";
+      writing_mode?: boolean;
+    },
+  ) => void;
   onFollowupsVisibilityChange?: (visible: boolean) => void;
   onSubmit?: (message: PromptInputMessage) => void;
   onStop?: () => void;
@@ -236,15 +239,22 @@ export function InputBox({
     [onContextChange, context, supportThinking],
   );
 
-  const handleReasoningEffortSelect = useCallback(
+  const handleReasoningEffortSelect = useCallback(
     (effort: "minimal" | "low" | "medium" | "high") => {
       onContextChange?.({
         ...context,
         reasoning_effort: effort,
       });
     },
-    [onContextChange, context],
-  );
+    [onContextChange, context],
+  );
+
+  const handleWritingModeToggle = useCallback(() => {
+    onContextChange?.({
+      ...context,
+      writing_mode: !context.writing_mode,
+    });
+  }, [context, onContextChange]);
 
   const handleSubmit = useCallback(
     async (message: PromptInputMessage) => {
@@ -505,8 +515,28 @@ export function InputBox({
               />
             </PromptInputActionMenuContent>
           </PromptInputActionMenu> */}
-            <AddAttachmentsButton className="rounded-full border border-[#eee3d5] bg-[#fffaf5] px-2.5! shadow-none hover:bg-white" />
-            <PromptInputActionMenu>
+            <AddAttachmentsButton className="rounded-full border border-[#eee3d5] bg-[#fffaf5] px-2.5! shadow-none hover:bg-white" />
+            <Tooltip
+              content={
+                context.writing_mode
+                  ? "写作模式已开启：最终输出会强制保存为 Markdown 文件"
+                  : "开启写作模式：最终输出保存为 Markdown 文件并进入画布"
+              }
+            >
+              <PromptInputButton
+                className={cn(
+                  "gap-1.5! rounded-full border px-3! shadow-none",
+                  context.writing_mode
+                    ? "border-[#d8b878] bg-[#fff3cf] text-[#6d5625] hover:bg-[#ffedbd]"
+                    : "border-[#eee3d5] bg-[#fffaf5] text-[#7e6a57] hover:bg-white",
+                )}
+                onClick={handleWritingModeToggle}
+              >
+                <FileTextIcon className="size-3" />
+                <span className="text-xs font-normal">写作</span>
+              </PromptInputButton>
+            </Tooltip>
+            <PromptInputActionMenu>
               <ModeHoverGuide
                 mode={
                   context.mode === "flash" ||
diff --git a/frontend-web/src/components/workspace/messages/message-group.tsx b/frontend-web/src/components/workspace/messages/message-group.tsx
index 1e32df33..e995fb02 100644
--- a/frontend-web/src/components/workspace/messages/message-group.tsx
+++ b/frontend-web/src/components/workspace/messages/message-group.tsx
@@ -329,41 +329,43 @@ function ToolCall({
         )}
       </ChainOfThoughtStep>
     );
-  } else if (name === "write_file" || name === "str_replace") {
-    let description: string | undefined = (args as { description: string })
-      ?.description;
-    if (!description) {
-      description = t.toolCalls.writeFile;
-    }
-    const path: string | undefined = (args as { path: string })?.path;
-    if (isLoading && isLast && autoOpen && autoSelect && path && !result) {
-      setTimeout(() => {
-        const url = new URL(
-          `write-file:${path}?message_id=${messageId}&tool_call_id=${id}`,
-        ).toString();
-        if (selectedArtifact === url) {
-          return;
-        }
-        select(url, true);
-        setOpen(true);
-      }, 100);
-    }
+  } else if (name === "write_file" || name === "str_replace") {
+    let description: string | undefined = (args as { description: string })
+      ?.description;
+    if (!description) {
+      description = t.toolCalls.writeFile;
+    }
+    const path: string | undefined = (args as { path: string })?.path;
+    const artifactPath =
+      name === "write_file" && path
+        ? new URL(
+            `write-file:${path}?message_id=${messageId}&tool_call_id=${id}`,
+          ).toString()
+        : path;
+    if (isLoading && isLast && autoOpen && autoSelect && path && !result) {
+      setTimeout(() => {
+        if (!artifactPath || selectedArtifact === artifactPath) {
+          return;
+        }
+        select(artifactPath, true);
+        setOpen(true);
+      }, 100);
+    }
 
     return (
       <ChainOfThoughtStep
         key={id}
         className="cursor-pointer"
-        label={description}
-        icon={NotebookPenIcon}
-        onClick={() => {
-          select(
-            new URL(
-              `write-file:${path}?message_id=${messageId}&tool_call_id=${id}`,
-            ).toString(),
-          );
-          setOpen(true);
-        }}
-      >
+        label={description}
+        icon={NotebookPenIcon}
+        onClick={() => {
+          if (!artifactPath) {
+            return;
+          }
+          select(artifactPath);
+          setOpen(true);
+        }}
+      >
         {path && (
           <ChainOfThoughtSearchResult className="cursor-pointer">
             {path}
diff --git a/frontend-web/src/core/artifacts/api.ts b/frontend-web/src/core/artifacts/api.ts
new file mode 100644
index 00000000..83a57a4c
--- /dev/null
+++ b/frontend-web/src/core/artifacts/api.ts
@@ -0,0 +1,40 @@
+import { apiFetch } from "@/core/api";
+
+import { urlOfArtifact } from "./utils";
+
+async function errorMessageFromResponse(res: Response): Promise<string> {
+  try {
+    const data: unknown = await res.json();
+    if (data && typeof data === "object" && "detail" in data) {
+      const detail = (data as { detail: unknown }).detail;
+      if (typeof detail === "string") return detail;
+    }
+  } catch {
+    // ignore non-json errors
+  }
+  return res.statusText || "Request failed";
+}
+
+export async function updateArtifactContent({
+  filepath,
+  threadId,
+  content,
+  isMock,
+}: {
+  filepath: string;
+  threadId: string;
+  content: string;
+  isMock?: boolean;
+}) {
+  const res = await apiFetch(urlOfArtifact({ filepath, threadId, isMock }), {
+    method: "PATCH",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify({ content }),
+  });
+  if (!res.ok) {
+    throw new Error(await errorMessageFromResponse(res));
+  }
+  return res.text();
+}
diff --git a/frontend-web/src/core/artifacts/hooks.ts b/frontend-web/src/core/artifacts/hooks.ts
index f85371ab..ed6383b2 100644
--- a/frontend-web/src/core/artifacts/hooks.ts
+++ b/frontend-web/src/core/artifacts/hooks.ts
@@ -1,9 +1,65 @@
-import { useQuery } from "@tanstack/react-query";
-import { useMemo } from "react";
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { useMemo } from "react";
 
 import { useThread } from "@/components/workspace/messages/context";
 
-import { loadArtifactContent, loadArtifactContentFromToolCall } from "./loader";
+import { loadArtifactContent, loadArtifactContentFromToolCall } from "./loader";
+import { updateArtifactContent } from "./api";
+
+function hasToolResult(thread: ReturnType<typeof useThread>["thread"], toolCallId?: string) {
+  if (!toolCallId) {
+    return false;
+  }
+  return thread.messages.some(
+    (message) => message.type === "tool" && message.tool_call_id === toolCallId,
+  );
+}
+
+function applyPendingTextEdit({
+  content,
+  filepath,
+  thread,
+}: {
+  content: string | undefined;
+  filepath: string;
+  thread: ReturnType<typeof useThread>["thread"];
+}) {
+  if (!content || !thread.isLoading) {
+    return null;
+  }
+
+  for (const message of [...thread.messages].reverse()) {
+    if (message.type !== "ai" || !message.tool_calls) {
+      continue;
+    }
+    for (const toolCall of [...message.tool_calls].reverse()) {
+      if (toolCall.name !== "str_replace" || hasToolResult(thread, toolCall.id)) {
+        continue;
+      }
+      const args = toolCall.args as {
+        path?: unknown;
+        old_str?: unknown;
+        new_str?: unknown;
+        replace_all?: unknown;
+      };
+      if (args.path !== filepath) {
+        continue;
+      }
+      if (typeof args.old_str !== "string" || typeof args.new_str !== "string") {
+        continue;
+      }
+      if (!content.includes(args.old_str)) {
+        return { content, kind: "editing" as const };
+      }
+      const nextContent =
+        args.replace_all === true
+          ? content.split(args.old_str).join(args.new_str)
+          : content.replace(args.old_str, args.new_str);
+      return { content: nextContent, kind: "editing" as const };
+    }
+  }
+  return null;
+}
 
 export function useArtifactContent({
   filepath,
@@ -25,19 +81,48 @@ export function useArtifactContent({
     return null;
   }, [filepath, isWriteFile, thread]);
 
-  const { data, isLoading, error } = useQuery({
-    queryKey: ["artifact", filepath, threadId, isMock],
+  const { data, isLoading, error } = useQuery({
+    queryKey: ["artifact", filepath, threadId, isMock],
     queryFn: () => {
       return loadArtifactContent({ filepath, threadId, isMock });
     },
-    enabled,
-    // Cache artifact content for 5 minutes to avoid repeated fetches (especially for .skill ZIP extraction)
-    staleTime: 5 * 60 * 1000,
-  });
-  return {
-    content: isWriteFile ? content : data?.content,
-    url: isWriteFile ? undefined : data?.url,
-    isLoading,
-    error,
-  };
-}
+    enabled,
+    refetchInterval: thread.isLoading ? 1000 : false,
+    // Cache artifact content for 5 minutes to avoid repeated fetches (especially for .skill ZIP extraction)
+    staleTime: 5 * 60 * 1000,
+  });
+  const pendingEdit = useMemo(() => {
+    if (isWriteFile) {
+      return null;
+    }
+    return applyPendingTextEdit({
+      content: data?.content,
+      filepath,
+      thread,
+    });
+  }, [data?.content, filepath, isWriteFile, thread]);
+
+  return {
+    content: isWriteFile ? content : (pendingEdit?.content ?? data?.content),
+    url: isWriteFile ? undefined : data?.url,
+    isLoading,
+    isApplyingEdit: pendingEdit?.kind === "editing",
+    error,
+  };
+}
+
+export function useUpdateArtifactContent() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: updateArtifactContent,
+    onSuccess: (content, variables) => {
+      queryClient.setQueryData(
+        ["artifact", variables.filepath, variables.threadId, variables.isMock],
+        {
+          content,
+          url: undefined,
+        },
+      );
+    },
+  });
+}
diff --git a/frontend-web/src/core/artifacts/index.ts b/frontend-web/src/core/artifacts/index.ts
index cc320652..2d5bc00f 100644
--- a/frontend-web/src/core/artifacts/index.ts
+++ b/frontend-web/src/core/artifacts/index.ts
@@ -1,2 +1,3 @@
-export * from "./download";
-export * from "./loader";
+export * from "./api";
+export * from "./download";
+export * from "./loader";
diff --git a/frontend-web/src/core/settings/local.ts b/frontend-web/src/core/settings/local.ts
index 87f86136..2d7cb8d0 100644
--- a/frontend-web/src/core/settings/local.ts
+++ b/frontend-web/src/core/settings/local.ts
@@ -5,11 +5,12 @@ export const DEFAULT_LOCAL_SETTINGS: LocalSettings = {
     enabled: true,
   },
   context: {
-    model_name: undefined,
-    mode: undefined,
-    reasoning_effort: undefined,
-  },
-};
+    model_name: undefined,
+    mode: undefined,
+    reasoning_effort: undefined,
+    writing_mode: false,
+  },
+};
 
 export const LOCAL_SETTINGS_KEY = "deerflow.local-settings";
 export const THREAD_MODEL_KEY_PREFIX = "deerflow.thread-model.";
diff --git a/frontend-web/src/core/threads/types.ts b/frontend-web/src/core/threads/types.ts
index 16c104f2..0f00dd9f 100644
--- a/frontend-web/src/core/threads/types.ts
+++ b/frontend-web/src/core/threads/types.ts
@@ -14,9 +14,11 @@ export interface AgentThreadContext extends Record<string, unknown> {
   model_name: string | undefined;
   thinking_enabled: boolean;
   is_plan_mode: boolean;
-  subagent_enabled: boolean;
-  reasoning_effort?: "minimal" | "low" | "medium" | "high";
-  agent_id?: string;
+  subagent_enabled: boolean;
+  reasoning_effort?: "minimal" | "low" | "medium" | "high";
+  writing_mode?: boolean;
+  writing_artifact_path?: string;
+  agent_id?: string;
   /** @deprecated kept for reading legacy thread metadata; prefer agent_id */
   agent_name?: string;
 }
diff --git a/frontend-web/src/pages/ChatPage.tsx b/frontend-web/src/pages/ChatPage.tsx
index d447a232..5e818175 100644
--- a/frontend-web/src/pages/ChatPage.tsx
+++ b/frontend-web/src/pages/ChatPage.tsx
@@ -1,9 +1,9 @@
 "use client";
 
-import { useCallback, useEffect, useState } from "react";
-
-import { type PromptInputMessage } from "@/components/ai-elements/prompt-input";
-import { ArtifactTrigger } from "@/components/workspace/artifacts";
+import { useCallback, useEffect, useMemo, useState } from "react";
+
+import { type PromptInputMessage } from "@/components/ai-elements/prompt-input";
+import { ArtifactTrigger, useArtifacts } from "@/components/workspace/artifacts";
 import {
   ChatBox,
   useSpecificChatMode,
@@ -37,9 +37,10 @@ export default function ChatPage() {
   const { threadId, setThreadId, isNewThread, setIsNewThread, isMock } =
     useThreadChat();
   const [settings, setSettings] = useThreadSettings(threadId);
-  const [mounted, setMounted] = useState(false);
-  const { tokenUsageEnabled } = useModels();
-  useSpecificChatMode();
+  const [mounted, setMounted] = useState(false);
+  const { tokenUsageEnabled } = useModels();
+  const { selectedArtifact } = useArtifacts();
+  useSpecificChatMode();
 
   useEffect(() => {
     setMounted(true);
@@ -53,7 +54,7 @@ export default function ChatPage() {
 
   const { showNotification } = useNotification();
 
-  const [thread, sendMessage, isUploading] = useThreadStream({
+  const [thread, sendMessage, isUploading] = useThreadStream({
     threadId: isNewThread ? undefined : threadId,
     context: settings.context,
     isMock,
@@ -83,17 +84,34 @@ export default function ChatPage() {
         showNotification(state.title, { body });
       }
     },
-  });
-
+  });
+
+  const writingArtifactPath = useMemo(() => {
+    const isMarkdown = (path: string | null | undefined) =>
+      !!path && /\.(md|markdown)(?:$|[?#])/i.test(path);
+    if (isMarkdown(selectedArtifact)) {
+      return selectedArtifact ?? undefined;
+    }
+    return [...(thread.values.artifacts ?? [])]
+      .reverse()
+      .find((path) => isMarkdown(path));
+  }, [selectedArtifact, thread.values.artifacts]);
+
   const handleSubmit = useCallback(
     (message: PromptInputMessage) => {
       setHasStartedConversation(true);
-      window.dispatchEvent(
-        new CustomEvent("workspace:sandbox-resume-autoscroll"),
-      );
-      void sendMessage(threadId, message);
-    },
-    [sendMessage, threadId],
+      window.dispatchEvent(
+        new CustomEvent("workspace:sandbox-resume-autoscroll"),
+      );
+      void sendMessage(
+        threadId,
+        message,
+        settings.context.writing_mode && writingArtifactPath
+          ? { writing_artifact_path: writingArtifactPath }
+          : undefined,
+      );
+    },
+    [sendMessage, settings.context.writing_mode, threadId, writingArtifactPath],
   );
   const handleClarificationSubmit = useCallback(
     async (answer: string) => {
diff --git a/offline-backend-20260512/backend/app/gateway/routers/artifacts.py b/offline-backend-20260512/backend/app/gateway/routers/artifacts.py
index 54d54de6..8bfecdee 100644
--- a/offline-backend-20260512/backend/app/gateway/routers/artifacts.py
+++ b/offline-backend-20260512/backend/app/gateway/routers/artifacts.py
@@ -4,21 +4,38 @@ import zipfile
 from pathlib import Path
 from urllib.parse import quote
 
-from fastapi import APIRouter, HTTPException, Request
-from fastapi.responses import FileResponse, PlainTextResponse, Response
+from fastapi import APIRouter, HTTPException, Request
+from fastapi.responses import FileResponse, PlainTextResponse, Response
+from pydantic import BaseModel
 
 from app.gateway.authz import require_permission
 from app.gateway.path_utils import resolve_thread_virtual_path
 
 logger = logging.getLogger(__name__)
 
-router = APIRouter(prefix="/api", tags=["artifacts"])
+router = APIRouter(prefix="/api", tags=["artifacts"])
 
-ACTIVE_CONTENT_MIME_TYPES = {
+ACTIVE_CONTENT_MIME_TYPES = {
     "text/html",
     "application/xhtml+xml",
     "image/svg+xml",
-}
+}
+
+EDITABLE_TEXT_SUFFIXES = {
+    ".md",
+    ".markdown",
+    ".txt",
+    ".json",
+    ".yaml",
+    ".yml",
+    ".csv",
+    ".xml",
+    ".log",
+}
+
+
+class ArtifactUpdateRequest(BaseModel):
+    content: str
 
 
 def _build_content_disposition(disposition_type: str, filename: str) -> str:
@@ -180,4 +197,45 @@ async def get_artifact(thread_id: str, path: str, request: Request, download: bo
     if is_text_file_by_content(actual_path):
         return PlainTextResponse(content=actual_path.read_text(encoding="utf-8"), media_type=mime_type)
 
-    return Response(content=actual_path.read_bytes(), media_type=mime_type, headers={"Content-Disposition": _build_content_disposition("inline", actual_path.name)})
+    return Response(content=actual_path.read_bytes(), media_type=mime_type, headers={"Content-Disposition": _build_content_disposition("inline", actual_path.name)})
+
+
+@router.patch(
+    "/threads/{thread_id}/artifacts/{path:path}",
+    summary="Update Artifact File",
+    description="Update a text artifact file in the current thread workspace.",
+)
+@require_permission("threads", "write", owner_check=True)
+async def update_artifact(
+    thread_id: str,
+    path: str,
+    request: Request,
+    body: ArtifactUpdateRequest,
+) -> Response:
+    """Update a text artifact.
+
+    This endpoint is intentionally limited to normal text artifacts. Files inside
+    .skill archives and active web content remain read-only from the artifact UI.
+    """
+    if ".skill/" in path:
+        raise HTTPException(status_code=400, detail="Skill archive contents are read-only.")
+
+    actual_path = resolve_thread_virtual_path(thread_id, path)
+    logger.info(f"Updating artifact path: thread_id={thread_id}, requested_path={path}, actual_path={actual_path}")
+
+    if not actual_path.exists():
+        raise HTTPException(status_code=404, detail=f"Artifact not found: {path}")
+
+    if not actual_path.is_file():
+        raise HTTPException(status_code=400, detail=f"Path is not a file: {path}")
+
+    mime_type, _ = mimetypes.guess_type(actual_path)
+    suffix = actual_path.suffix.lower()
+    if mime_type in ACTIVE_CONTENT_MIME_TYPES:
+        raise HTTPException(status_code=400, detail="Active web artifacts are read-only.")
+
+    if suffix not in EDITABLE_TEXT_SUFFIXES and not (mime_type and mime_type.startswith("text/")):
+        raise HTTPException(status_code=400, detail="Only text artifacts can be edited.")
+
+    actual_path.write_text(body.content, encoding="utf-8")
+    return PlainTextResponse(content=body.content, media_type=mime_type or "text/plain")
diff --git a/offline-backend-20260512/backend/app/gateway/services.py b/offline-backend-20260512/backend/app/gateway/services.py
index 95d8a059..4f888da4 100644
--- a/offline-backend-20260512/backend/app/gateway/services.py
+++ b/offline-backend-20260512/backend/app/gateway/services.py
@@ -110,8 +110,10 @@ _CONTEXT_CONFIGURABLE_KEYS: frozenset[str] = frozenset(
         "model_name",
         "mode",
         "thinking_enabled",
-        "reasoning_effort",
-        "is_plan_mode",
+        "reasoning_effort",
+        "writing_mode",
+        "writing_artifact_path",
+        "is_plan_mode",
         "subagent_enabled",
         "max_concurrent_subagents",
         "agent_name",
diff --git a/offline-backend-20260512/backend/packages/harness/deerflow/agents/lead_agent/agent.py b/offline-backend-20260512/backend/packages/harness/deerflow/agents/lead_agent/agent.py
index c1794647..f4fbe7bd 100644
--- a/offline-backend-20260512/backend/packages/harness/deerflow/agents/lead_agent/agent.py
+++ b/offline-backend-20260512/backend/packages/harness/deerflow/agents/lead_agent/agent.py
@@ -328,9 +328,13 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
     requested_model_name: str | None = cfg.get("model_name") or cfg.get("model")
     is_plan_mode = cfg.get("is_plan_mode", False)
     subagent_enabled = cfg.get("subagent_enabled", False)
-    max_concurrent_subagents = cfg.get("max_concurrent_subagents", 3)
-    is_bootstrap = cfg.get("is_bootstrap", False)
-    agent_id = validate_agent_id(cfg.get("agent_id") or cfg.get("agent_name"))
+    max_concurrent_subagents = cfg.get("max_concurrent_subagents", 3)
+    is_bootstrap = cfg.get("is_bootstrap", False)
+    writing_mode = bool(cfg.get("writing_mode", False))
+    writing_artifact_path = cfg.get("writing_artifact_path") if writing_mode else None
+    if not isinstance(writing_artifact_path, str) or not writing_artifact_path.strip():
+        writing_artifact_path = None
+    agent_id = validate_agent_id(cfg.get("agent_id") or cfg.get("agent_name"))
 
     agent_config = load_agent_config(agent_id) if not is_bootstrap else None
     agent_display_name = agent_config.name if agent_config else agent_id
@@ -349,14 +353,15 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
         thinking_enabled = False
 
     logger.info(
-        "Create Agent(%s) -> thinking_enabled: %s, reasoning_effort: %s, model_name: %s, is_plan_mode: %s, subagent_enabled: %s, max_concurrent_subagents: %s",
-        agent_id or "default",
-        thinking_enabled,
-        reasoning_effort,
-        model_name,
-        is_plan_mode,
-        subagent_enabled,
-        max_concurrent_subagents,
+        "Create Agent(%s) -> thinking_enabled: %s, reasoning_effort: %s, model_name: %s, is_plan_mode: %s, subagent_enabled: %s, max_concurrent_subagents: %s, writing_mode: %s",
+        agent_id or "default",
+        thinking_enabled,
+        reasoning_effort,
+        model_name,
+        is_plan_mode,
+        subagent_enabled,
+        max_concurrent_subagents,
+        writing_mode,
     )
 
     # Inject run metadata for LangSmith trace tagging
@@ -380,8 +385,10 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
             "thinking_enabled": thinking_enabled,
             "reasoning_effort": reasoning_effort,
             "is_plan_mode": is_plan_mode,
-            "subagent_enabled": subagent_enabled,
-            "tool_groups": agent_config.tool_groups if agent_config else None,
+            "subagent_enabled": subagent_enabled,
+            "writing_mode": writing_mode,
+            "writing_artifact_path": writing_artifact_path,
+            "tool_groups": agent_config.tool_groups if agent_config else None,
             "available_skills": runtime_available_skills,
         }
     )
@@ -400,9 +407,11 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
             middleware=_build_middlewares(config, model_name=model_name, app_config=resolved_app_config),
             system_prompt=apply_prompt_template(
                 subagent_enabled=subagent_enabled,
-                max_concurrent_subagents=max_concurrent_subagents,
-                available_skills=set(["bootstrap"]),
-                app_config=resolved_app_config,
+                max_concurrent_subagents=max_concurrent_subagents,
+                writing_mode=writing_mode,
+                writing_artifact_path=writing_artifact_path,
+                available_skills=set(["bootstrap"]),
+                app_config=resolved_app_config,
             ),
             state_schema=ThreadState,
         )
@@ -421,10 +430,12 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
         system_prompt=apply_prompt_template(
             subagent_enabled=subagent_enabled,
             max_concurrent_subagents=max_concurrent_subagents,
-            agent_id=agent_id,
-            agent_name=agent_display_name,
-            available_skills=(set(agent_config.skills or []) if agent_config else None),
-            app_config=resolved_app_config,
+            agent_id=agent_id,
+            agent_name=agent_display_name,
+            writing_mode=writing_mode,
+            writing_artifact_path=writing_artifact_path,
+            available_skills=(set(agent_config.skills or []) if agent_config else None),
+            app_config=resolved_app_config,
         ),
         state_schema=ThreadState,
     )
diff --git a/offline-backend-20260512/backend/packages/harness/deerflow/agents/lead_agent/prompt.py b/offline-backend-20260512/backend/packages/harness/deerflow/agents/lead_agent/prompt.py
index e547730e..fd342d34 100644
--- a/offline-backend-20260512/backend/packages/harness/deerflow/agents/lead_agent/prompt.py
+++ b/offline-backend-20260512/backend/packages/harness/deerflow/agents/lead_agent/prompt.py
@@ -472,9 +472,11 @@ You: "Deploying to staging..." [proceed]
 
 {skills_section}
 
-{deferred_tools_section}
-
-{subagent_section}
+{deferred_tools_section}
+
+{writing_mode_section}
+
+{subagent_section}
 
 <working_directory existed="true">
 - User uploads: `/mnt/user-data/uploads` - Files uploaded by the user (automatically listed in context)
@@ -787,15 +789,17 @@ def _build_custom_mounts_section(*, app_config: AppConfig | None = None) -> str:
     return f"\n**Custom Mounted Directories:**\n{mounts_list}\n- If the user needs files outside `/mnt/user-data`, use these absolute container paths directly when they match the requested directory"
 
 
-def apply_prompt_template(
-    subagent_enabled: bool = False,
-    max_concurrent_subagents: int = 3,
-    *,
-    agent_id: str | None = None,
-    agent_name: str | None = None,
-    available_skills: set[str] | None = None,
-    app_config: AppConfig | None = None,
-) -> str:
+def apply_prompt_template(
+    subagent_enabled: bool = False,
+    max_concurrent_subagents: int = 3,
+    *,
+    agent_id: str | None = None,
+    agent_name: str | None = None,
+    writing_mode: bool = False,
+    writing_artifact_path: str | None = None,
+    available_skills: set[str] | None = None,
+    app_config: AppConfig | None = None,
+) -> str:
     storage_agent_id = agent_id if agent_id is not None else agent_name
 
     # Get memory context
@@ -827,7 +831,33 @@ def apply_prompt_template(
     skills_section = get_skills_prompt_section(available_skills, app_config=app_config)
 
     # Get deferred tools section (tool_search)
-    deferred_tools_section = get_deferred_tools_prompt_section(app_config=app_config)
+    deferred_tools_section = get_deferred_tools_prompt_section(app_config=app_config)
+    current_writing_artifact = (
+        f"\n**Current Markdown Artifact**\n- Continue editing this existing Markdown file unless the user explicitly asks for a new document: `{writing_artifact_path}`\n"
+        if writing_artifact_path
+        else ""
+    )
+    writing_mode_section = (
+        f"""
+<writing_mode>
+Writing mode is enabled for this run.
+
+**Mandatory Output Contract**
+- Treat the user's request as a writing/report-generation task.
+- Your final deliverable MUST be a Markdown file, not only an inline chat answer.
+- If a current Markdown artifact is provided below, you MUST revise that existing file rather than creating a new file, unless the user explicitly asks for a separate/new document.
+- When revising an existing Markdown artifact, read the file first if needed, then overwrite the same path with the complete updated Markdown content.
+- Write the deliverable to `/mnt/user-data/outputs/` with a clear `.md` filename, for example `/mnt/user-data/outputs/report.md`.
+- Use `write_file` or an equivalent file-writing tool to save the complete Markdown content.
+- After writing the file, call `present_files` with the Markdown file path so the user can open it as an artifact/canvas.
+- The final chat response should be brief and point to the generated Markdown artifact. Do not duplicate the full report inline unless the user explicitly asks.
+- If you revise an existing Markdown artifact, update the Markdown file and present it again.
+{current_writing_artifact}
+</writing_mode>
+"""
+        if writing_mode
+        else ""
+    )
 
     # Build ACP agent section only if ACP agents are configured
     acp_section = _build_acp_section(app_config=app_config)
@@ -841,9 +871,10 @@ def apply_prompt_template(
     prompt = SYSTEM_PROMPT_TEMPLATE.format(
         agent_name=agent_name or storage_agent_id or "DeerFlow 2.0",
         soul=get_agent_soul(storage_agent_id),
-        skills_section=skills_section,
-        deferred_tools_section=deferred_tools_section,
-        memory_context=memory_context,
+        skills_section=skills_section,
+        deferred_tools_section=deferred_tools_section,
+        writing_mode_section=writing_mode_section,
+        memory_context=memory_context,
         network_policy_section=network_policy_section,
         subagent_section=subagent_section,
         subagent_reminder=subagent_reminder,