fix: preserve session titles without context enhancement

src/channels/dingtalk/dingtalk-bridge.mjs

@@ -996,13 +996,16 @@ export class DingtalkHarnessBridge {
         ? await promptContentForMessage(promptMessage, { signal: this.#signal })
         : undefined;
       const snapshot = this.#acceptedMessageIds.get(messageId);
+      let contextEnhanced = false;
       if (snapshot) {
-        content = enhanceContextContent(content ?? text, snapshot, () => ({
+        const originalContent = content ?? text;
+        content = enhanceContextContent(originalContent, snapshot, () => ({
           channel: 'dingtalk',
           senderId: sender,
           senderName: message.senderNick,
           conversationTitle: message.conversationTitle,
         }));
+        contextEnhanced = content !== originalContent;
       }
       if (typeof this.#api.createAiCard === 'function'
         && typeof this.#api.updateAiCard === 'function'
@@ -1021,7 +1024,9 @@ export class DingtalkHarnessBridge {
         harness: this.#harness,
         state: this.#state,
         key,
-        ...(content !== undefined ? { content } : { text }),
+        text,
+        content,
+        contextEnhanced,
         createOptions: { signal: this.#signal },
         existsOptions: { signal: this.#signal },
         askOptions: {

src/channels/feishu/bridge.mjs

@@ -3293,11 +3293,14 @@ export class FeishuHarnessBridge {
       ? await promptContentForMessage(message, { signal: this.#signal })
       : undefined;
     const snapshot = this.#acceptedMessageIds.get(messageId);
+    let contextEnhanced = false;
     if (snapshot) {
-      content = enhanceContextContent(content ?? text, snapshot, () => ({
+      const originalContent = content ?? text;
+      content = enhanceContextContent(originalContent, snapshot, () => ({
         channel: 'feishu',
         senderId: senderOpenId(event),
       }));
+      contextEnhanced = content !== originalContent;
     }
     if (!this.#channel?.stream) {
       const { answer, artifacts = [] } = await askInWorkspaceSession({
@@ -3306,6 +3309,7 @@ export class FeishuHarnessBridge {
         key,
         text,
         content,
+        contextEnhanced,
         createOptions: { signal: this.#signal },
         existsOptions: { signal: this.#signal },
         askOptions: this.#interactionAskOptions(event, key, message.files),
@@ -3375,6 +3379,7 @@ export class FeishuHarnessBridge {
             key,
             text,
             content,
+            contextEnhanced,
             createOptions: { signal: this.#signal },
             existsOptions: { signal: this.#signal },
             askOptions,
@@ -3438,6 +3443,7 @@ export class FeishuHarnessBridge {
         key,
         text,
         content,
+        contextEnhanced,
         createOptions: { signal: this.#signal },
         existsOptions: { signal: this.#signal },
         askOptions: this.#interactionAskOptions(event, key, message.files),

src/channels/qq/qq-bridge.mjs

@@ -840,12 +840,15 @@ export class QqHarnessBridge {
         ? await promptContentForMessage(promptMessage, { signal: this.#signal })
         : undefined;
       const snapshot = this.#acceptedMessageIds.get(messageId);
+      let contextEnhanced = false;
       if (snapshot) {
-        content = enhanceContextContent(content ?? text, snapshot, () => ({
+        const originalContent = content ?? text;
+        content = enhanceContextContent(originalContent, snapshot, () => ({
           channel: 'qq',
           senderId: sender,
           senderName: message.kind === 'group' ? message.senderName : undefined,
         }));
+        contextEnhanced = content !== originalContent;
       }
       // QQ stream_messages can acknowledge a final frame without rendering it in
       // some C2C clients. Standard Markdown delivery is the reliable reply path.
@@ -860,7 +863,9 @@ export class QqHarnessBridge {
           harness: this.#harness,
           state: this.#state,
           key,
-          ...(content !== undefined ? { content } : { text }),
+          text,
+          content,
+          contextEnhanced,
           createOptions: { signal: this.#signal },
           existsOptions: { signal: this.#signal },
           askOptions: {

src/channels/shared/bot-workspace-store.mjs

@@ -1211,6 +1211,11 @@ export function createBotWorkspaceScope(
             readHistory(...args) {
               return invokeCurrentSession('readSessionHistory', args, 'history read');
             },
+            ...(typeof target.renameSession === 'function' ? {
+              renameTitle(...args) {
+                return invokeStartedSessionMutation('renameSession', args, 'title rename');
+              },
+            } : {}),
             selectModel(...args) {
               return invokeCurrentSession('selectSessionModel', args, 'model selection');
             },

src/channels/shared/harness-client.mjs

@@ -911,6 +911,12 @@ export class HarnessClient {
     return created.sessionId;
   }
 
+  async renameSession(sessionId, title, options = {}) {
+    if (typeof sessionId !== 'string' || !sessionId) throw new TypeError('sessionId is required');
+    if (typeof title !== 'string' || !title.trim()) throw new TypeError('session title is required');
+    return this.rpc('session.rename', { sessionId, title }, 30_000, options);
+  }
+
   async executeCommand(sessionId, line, options = {}) {
     if (typeof sessionId !== 'string' || !sessionId) throw new TypeError('sessionId is required');
     if (typeof line !== 'string' || !line) throw new TypeError('command line is required');

src/channels/shared/session-title.mjs

@@ -0,0 +1,74 @@
+const DEFAULT_MAX_TITLE_BYTES = 60;
+
+const OSC_SEQUENCE = /(?:\u001b\]|\u009d)(?:(?!\u0007|\u001b\\)[\s\S])*(?:\u0007|\u001b\\|$)/gu;
+const CSI_SEQUENCE = /(?:\u001b\[|\u009b)[0-?]*[ -/]*[@-~]/gu;
+const ESC_SEQUENCE = /\u001b[@-_]/gu;
+const CONTROL_CHARACTER = /[\u0000-\u0008\u000b\u000c\u000e-\u001f\u007f-\u009f]/gu;
+const DIRECTIONAL_CONTROL = /[\u200b\u200e\u200f\u202a-\u202e\u2060-\u2064\u2066-\u206f\ufeff]/gu;
+const INJECTED_CONTEXT_PREFIX = /^(?:<dsh_im_source>[\s\S]*?<\/dsh_im_source>\s*)?(?:<dsh_im_source_guidance>[\s\S]*?<\/dsh_im_source_guidance>\s*)?/u;
+const SEGMENTER = new Intl.Segmenter(undefined, { granularity: 'grapheme' });
+
+function cleanTitleText(input) {
+  return input
+    .replace(OSC_SEQUENCE, '')
+    .replace(CSI_SEQUENCE, '')
+    .replace(ESC_SEQUENCE, '')
+    .replace(CONTROL_CHARACTER, '')
+    .replace(DIRECTIONAL_CONTROL, '')
+    .replace(/\s+/gu, ' ')
+    .trim();
+}
+
+function truncateTitle(input, maxBytes = DEFAULT_MAX_TITLE_BYTES) {
+  if (Buffer.byteLength(input, 'utf8') <= maxBytes) return input;
+  const suffix = '…';
+  const budget = maxBytes - Buffer.byteLength(suffix, 'utf8');
+  let output = '';
+  for (const { segment } of SEGMENTER.segment(input)) {
+    if (Buffer.byteLength(output + segment, 'utf8') > budget) break;
+    output += segment;
+  }
+  return `${output.trimEnd()}${suffix}`;
+}
+
+function contentText(content) {
+  if (typeof content === 'string') return content;
+  if (!Array.isArray(content)) return '';
+  return content
+    .filter((block) => block?.type === 'text' && typeof block.text === 'string')
+    .map((block) => block.text)
+    .join('\n');
+}
+
+function fileDisplayName(file) {
+  const value = file?.name ?? file?.filename ?? file?.fileName;
+  if (typeof value !== 'string') return '';
+  return value
+    .replaceAll('\\', '/')
+    .split('/')
+    .at(-1)
+    ?.replace(/[\u0000-\u001f\u007f]/gu, '')
+    .trim() ?? '';
+}
+
+/** Build a deterministic title from the unenhanced first user message. */
+export function initialSessionTitle({ text, content, files } = {}) {
+  const original = typeof text === 'string' ? cleanTitleText(text) : '';
+  if (original) return truncateTitle(original);
+
+  // Structured image prompts may only expose their default text through content.
+  // Strip only the leading blocks inserted by dsh-im; matching tags later in user
+  // content remain ordinary user text.
+  const visibleContent = cleanTitleText(
+    contentText(content).replace(INJECTED_CONTEXT_PREFIX, ''),
+  );
+  if (visibleContent) return truncateTitle(visibleContent);
+
+  const fileName = Array.isArray(files)
+    ? files.map(fileDisplayName).find(Boolean)
+    : '';
+  const cleanFileName = fileName ? cleanTitleText(fileName) : '';
+  return cleanFileName ? truncateTitle(cleanFileName) : null;
+}
+
+export const INITIAL_SESSION_TITLE_MAX_BYTES = DEFAULT_MAX_TITLE_BYTES;

src/channels/shared/text-harness-bridge.mjs

@@ -673,13 +673,16 @@ export class TextHarnessBridge {
         ? await promptContentForMessage(message, { signal: this.#signal })
         : undefined;
       const snapshot = this.#acceptedMessageIds.get(messageId);
+      let contextEnhanced = false;
       if (snapshot) {
-        content = enhanceContextContent(content ?? text, snapshot, () => ({
+        const originalContent = content ?? text;
+        content = enhanceContextContent(originalContent, snapshot, () => ({
           channel: this.#descriptor.key,
           senderId,
           senderName: message.contextSource?.()?.senderName,
           conversationTitle: message.contextSource?.()?.conversationTitle,
         }));
+        contextEnhanced = content !== originalContent;
       }
       const { answer, artifacts = [] } = await askInWorkspaceSession({
         harness: this.#harness,
@@ -687,6 +690,7 @@ export class TextHarnessBridge {
         key: conversationKey,
         text,
         content,
+        contextEnhanced,
         createOptions: this.#signal ? { signal: this.#signal } : undefined,
         existsOptions: this.#signal ? { signal: this.#signal } : undefined,
         askOptions: {

src/channels/shared/workspace-session.mjs

@@ -1,4 +1,5 @@
 import { withSessionBindingLock } from './session-binding-lock.mjs';
+import { initialSessionTitle } from './session-title.mjs';
 
 export const WORKSPACE_SESSION_STALE = 'workspace-session-stale';
 
@@ -6,7 +7,7 @@ function workspaceSession(harness, sessionId) {
   if (typeof harness.workspaceSession === 'function') {
     return harness.workspaceSession(sessionId);
   }
-  return Object.freeze({
+  const session = {
     sessionId,
     sessionExists: (...args) => harness.sessionExists(sessionId, ...args),
     models: (...args) => harness.getSessionModels(sessionId, ...args),
@@ -16,7 +17,11 @@ function workspaceSession(harness, sessionId) {
     stopActiveTurn: (...args) => harness.stopActiveTurn(sessionId, ...args),
     steerActiveTurn: (...args) => harness.steerActiveTurn(sessionId, ...args),
     ask: (...args) => harness.ask(sessionId, ...args),
-  });
+  };
+  if (typeof harness.renameSession === 'function') {
+    session.renameTitle = (...args) => harness.renameSession(sessionId, ...args);
+  }
+  return Object.freeze(session);
 }
 
 async function sessionExists(session, options) {
@@ -42,10 +47,21 @@ export async function askInWorkspaceSession({
   key,
   text,
   content,
+  contextEnhanced = false,
   createOptions,
   existsOptions,
   askOptions,
 }) {
+  const initialTitle = contextEnhanced
+    ? initialSessionTitle({
+        text,
+        content,
+        files: typeof askOptions === 'object' ? askOptions?.files : undefined,
+      })
+    : null;
+  const renameSignal = createOptions?.signal
+    ?? (typeof askOptions === 'object' ? askOptions?.signal : undefined);
+  const renameOptions = renameSignal ? { signal: renameSignal } : undefined;
   while (true) {
     try {
       const binding = await withSessionBindingLock(state, key, async () => {
@@ -55,6 +71,16 @@ export async function askInWorkspaceSession({
           sessionId = await createSession(harness, createOptions);
           if (await state.setSession(key, sessionId) === false) return null;
           session = workspaceSession(harness, sessionId);
+          if (initialTitle && typeof session.renameTitle === 'function') {
+            try {
+              await session.renameTitle(initialTitle, renameOptions);
+            } catch (error) {
+              if (error?.code === WORKSPACE_SESSION_STALE || renameOptions?.signal?.aborted) {
+                throw error;
+              }
+              console.warn('[dsh-im] unable to set the initial Session title:', error?.message ?? error);
+            }
+          }
         }
         return { sessionId, session };
       });

src/channels/wecom/wecom-bridge.mjs

@@ -1007,11 +1007,14 @@ export class WecomHarnessBridge {
         ? await promptContentForMessage(message, { signal: this.#signal })
         : undefined;
       const snapshot = this.#acceptedMessageIds.get(messageId);
+      let contextEnhanced = false;
       if (snapshot) {
-        content = enhanceContextContent(content ?? text, snapshot, () => ({
+        const originalContent = content ?? text;
+        content = enhanceContextContent(originalContent, snapshot, () => ({
           channel: 'wecom',
           senderId,
         }));
+        contextEnhanced = content !== originalContent;
       }
       await this.#state.markSeen(messageId);
       promptRecorded = true;
@@ -1021,6 +1024,7 @@ export class WecomHarnessBridge {
         key,
         text,
         content,
+        contextEnhanced,
         createOptions: { signal: this.#signal },
         existsOptions: { signal: this.#signal },
         askOptions: {

src/channels/weixin/weixin-bridge.mjs

@@ -705,11 +705,14 @@ export class WeixinHarnessBridge {
           ? await promptContentForMessage(promptMessage, { signal: this.#signal })
           : undefined;
         const snapshot = this.#acceptedMessageIds.get(messageId);
+        let contextEnhanced = false;
         if (snapshot) {
-          content = enhanceContextContent(content ?? text, snapshot, () => ({
+          const originalContent = content ?? text;
+          content = enhanceContextContent(originalContent, snapshot, () => ({
             channel: 'weixin',
             senderId: sender,
           }));
+          contextEnhanced = content !== originalContent;
         }
         await this.#state.markSeen(messageId);
         promptRecorded = true;
@@ -717,7 +720,9 @@ export class WeixinHarnessBridge {
           harness: this.#harness,
           state: this.#state,
           key,
-          ...(content !== undefined ? { content } : { text }),
+          text,
+          content,
+          contextEnhanced,
           createOptions: { signal: this.#signal },
           existsOptions: { signal: this.#signal },
           askOptions: {