diff --git a/frontend-web/src/eightbf-roundtable/pages/EightBfRoundtablePage.tsx b/frontend-web/src/eightbf-roundtable/pages/EightBfRoundtablePage.tsx
index 6922a0a0..4bd4f5ed 100644
--- a/frontend-web/src/eightbf-roundtable/pages/EightBfRoundtablePage.tsx
+++ b/frontend-web/src/eightbf-roundtable/pages/EightBfRoundtablePage.tsx
@@ -257,6 +257,8 @@ export default function EightBfRoundtablePage({ compactChrome = false }: { compa
       lockedChainId={mapping?.chainId ?? null}
       lockBusinessChain
       storageTaskId={storageTaskId}
+      // 无 taskId 进入时每次都开全新会话（不回显 anonymous 键下的最新草稿）；带 taskId 保持回显现状。
+      skipInitialDraftRestore={!taskId}
       taskContext={taskContext as Record<string, unknown> | null}
       entryRailTaskId={taskId || null}
       entryRailTaskCardSlot={taskId ? (
diff --git a/frontend-web/src/roundtable-planning/pages/RoundtablePlanningPage.tsx b/frontend-web/src/roundtable-planning/pages/RoundtablePlanningPage.tsx
index 56568b4a..d145291b 100644
--- a/frontend-web/src/roundtable-planning/pages/RoundtablePlanningPage.tsx
+++ b/frontend-web/src/roundtable-planning/pages/RoundtablePlanningPage.tsx
@@ -310,6 +310,11 @@ export default function RoundtablePlanningPage({
   lockBusinessChain = false,
   /** 独立业务页的草稿/后台作业存储键。 */
   storageTaskId,
+  /**
+   * 独立业务页要求「每次进入都是全新会话」（8BF 无 taskId 模式）：挂载时跳过按存储键
+   * 回显最新草稿，直接展示空白新会话；历史会话仍留在历史下拉/分析记录里，可手动打开。
+   */
+  skipInitialDraftRestore = false,
   /** 供独立业务页在原页头部插入自己的操作入口。 */
   toolbarSlot,
   /** 独立业务页在第一步左上角替换默认业务链选择区的内容。 */
@@ -351,6 +356,7 @@ export default function RoundtablePlanningPage({
   lockedChainId?: string | null;
   lockBusinessChain?: boolean;
   storageTaskId?: string | null;
+  skipInitialDraftRestore?: boolean;
   toolbarSlot?: ReactNode;
   entryRailBusinessChainSlot?: ReactNode;
   entryRailTaskCardSlot?: ReactNode;
@@ -1368,6 +1374,12 @@ export default function RoundtablePlanningPage({
     // 回显聊天记录按存储键：8BF 用独立 `storageTaskId`；xdfx-A 按行动id；其它深链按真实 taskId。
     const tid = draftStorageTaskId;
     if (!tid) return;
+    // 8BF 无 taskId 模式：每次进入开全新会话，跳过回显（历史下拉仍可手动打开旧会话）。
+    // 仍要解除 taskRestoreResolved，别把依赖它的 autoStart 闸门永久挂起。
+    if (skipInitialDraftRestore) {
+      setTaskRestoreResolved(true);
+      return;
+    }
     let cancelled = false;
     void (async () => {
       try {
diff --git a/offline-backend-20260512/backend/app/gateway/routers/roundtable_chains.py b/offline-backend-20260512/backend/app/gateway/routers/roundtable_chains.py
index 321c5a2c..e847830a 100644
--- a/offline-backend-20260512/backend/app/gateway/routers/roundtable_chains.py
+++ b/offline-backend-20260512/backend/app/gateway/routers/roundtable_chains.py
@@ -28,7 +28,7 @@ from fastapi import APIRouter, Depends, HTTPException, Request
 from langchain_core.messages import HumanMessage, SystemMessage
 from pydantic import BaseModel, Field
 
-from app.gateway.deps import get_config, get_local_provider
+from app.gateway.deps import get_agent_store, get_config, get_local_provider
 from deerflow.config.app_config import AppConfig
 from deerflow.models import create_chat_model
 from deerflow.runtime.user_context import get_effective_user_id
@@ -202,6 +202,65 @@ def _get_store(request: Request):
     return store
 
 
+async def _publish_seat_agents(request: Request, row: dict, user_id: str, *, is_admin: bool) -> list[str]:
+    """把链条席位里尚未公开的自定义智能体一并发布（best-effort）。
+
+    公共链条对其他账号可用的前提是链上每个席位智能体本身已发布（见
+    business_mapping 的 ``_validate_public_chain_mapping`` 联动校验——只发布
+    链条、不发布其中的自定义智能体，别的账号会解析不到席位）。故链条处于
+    公共态时自动补发：
+      - 内置智能体（``user_id IS NULL``）全局可见，跳过；
+      - 已公开（``published`` 且非 ``is_private``）跳过；
+      - 其余置 ``published=True`` 并清 ``is_private=False``（两者互斥，私密
+        广场智能体要变公共必须同时清私密标记）。
+    非管理员只能发布本人的智能体（store.update 的 owner 限定）；他人的智能体
+    正常流程不会出现在自己链条里，跳过并记日志。单个失败不阻断链条发布。
+    返回本次实际发布成功的智能体名列表（仅供日志/排查）。
+    """
+    agent_ids: list[str] = []
+    for seat in row.get("seats") or []:
+        if isinstance(seat, dict) and seat.get("agent_id"):
+            agent_ids.append(str(seat["agent_id"]))
+    if not agent_ids:
+        return []
+    try:
+        agent_store = get_agent_store(request)
+    except HTTPException:
+        return []
+    published: list[str] = []
+    for agent_id in dict.fromkeys(agent_ids):
+        try:
+            agent = await agent_store.get_any(agent_id)
+        except Exception:
+            logger.warning("chain seat agent lookup failed: %s", agent_id, exc_info=True)
+            continue
+        if agent is None or agent.get("user_id") is None:
+            continue  # 已删除 / 内置智能体：内置全局可见，无需发布
+        if agent.get("published") and not agent.get("is_private"):
+            continue  # 已公开
+        updates = {"published": True, "is_private": False}
+        try:
+            updated = await agent_store.update_any(agent_id, updates) if is_admin else await agent_store.update(agent_id, user_id, updates)
+        except Exception:
+            logger.warning("chain seat agent publish failed: %s", agent_id, exc_info=True)
+            continue
+        if updated is None:
+            logger.info(
+                "chain seat agent %s not publishable by user %s (not owner); skipped",
+                agent_id,
+                user_id,
+            )
+            continue
+        published.append(agent.get("name") or agent_id)
+        logger.info(
+            "auto-published chain seat agent %s (%s) with chain %s",
+            agent_id,
+            agent.get("name"),
+            row.get("id"),
+        )
+    return published
+
+
 def _validate_seats(seats: list[ChainSeatSchema]) -> None:
     """Enforce 2 ≤ N ≤ 20 and reject duplicate agent ids within a chain."""
     if len(seats) < MIN_SEATS or len(seats) > MAX_SEATS:
@@ -259,9 +318,7 @@ def _validate_stages(seats: list[ChainSeatSchema], stages: list[list[str]] | Non
 MAX_STAGE_GOAL_CHARS = 1000
 
 
-def _validate_stage_goals(
-    stages: list[list[str]] | None, stage_goals: list[str | None] | None
-) -> None:
+def _validate_stage_goals(stages: list[list[str]] | None, stage_goals: list[str | None] | None) -> None:
     """Validate the optional per-stage goals (None = no goals, always valid).
 
     Rules:
@@ -379,11 +436,16 @@ async def update_chain(request: Request, chain_id: str, body: ChainUpdateRequest
     _validate_seat_mode(body.seat_mode)
     store = _get_store(request)
     user_id = _current_user_id(request)
+    is_admin = _is_admin(request)
     # Distinguish "omitted" from "explicitly sent"; only forward provided fields.
     fields = body.model_dump(exclude_unset=True)
-    row = await store.update_chain(chain_id, user_id, is_admin=_is_admin(request), **fields)
+    row = await store.update_chain(chain_id, user_id, is_admin=is_admin, **fields)
     if row is None:
         raise HTTPException(status_code=404, detail="Chain not found")
+    # 发布联动：链条更新后处于公共态时（点发布，或已发布链再改席位），把链上
+    # 尚未发布的自定义智能体一并发布，保证其他账号解析公共链条时席位可用。
+    if row.get("is_public"):
+        await _publish_seat_agents(request, row, user_id, is_admin=is_admin)
     await _enrich_owner_names([row])
     return ChainResponse(**row)