diff --git a/.gitignore b/.gitignore
index 60e88df4..b5fa1a07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -118,8 +118,10 @@ offline-backend-20260512/backend/tests/*
 # Independent enterprise-research persistence, HTTP and race regressions.
 !offline-backend-20260512/backend/tests/test_enterprise_research_tasks.py
 # Position-roundtable per-turn write/present cap (weak-model duplicate artifacts).
-!offline-backend-20260512/backend/tests/test_position_artifact_cap.py
-# Workflow Studio: schemas / definitions / engine / run-lifecycle regressions
+!offline-backend-20260512/backend/tests/test_position_artifact_cap.py
+# Roundtable coordinator/seat capability isolation regressions.
+!offline-backend-20260512/backend/tests/test_roundtable_role_boundary.py
+# Workflow Studio: schemas / definitions / engine / run-lifecycle regressions
 # plus the concurrency remediation suite (atomic resume, draft CAS, publish
 # counter, event seq) — required in CI per docs/WORKFLOW_STUDIO_BACKEND_REMEDIATION_ZH.md P1-06.
 !offline-backend-20260512/backend/tests/test_workflow_schemas.py
diff --git a/frontend-web/src/roundtable-planning/api/multi-agent.ts b/frontend-web/src/roundtable-planning/api/multi-agent.ts
index 6eb5c0b4..d4509999 100644
--- a/frontend-web/src/roundtable-planning/api/multi-agent.ts
+++ b/frontend-web/src/roundtable-planning/api/multi-agent.ts
@@ -254,8 +254,7 @@ export interface StreamMultiAgentRequest {
    */
   synthesisMode?: boolean;
   /**
-   * 仅 leader 用。置 true 抑制「把总控本轮输入广播给各席位 thread」的预广播。DAG「每 stage
-   * 派活轮」置真——否则总控的派活 prompt 会进席位历史,弱模型据此模仿派活。后端缺省 false。
+   * 仅为兼容旧协议保留。总控 prompt 属于总控私有上下文，前端恒传 true，后端也会无条件隔离。
    */
   suppressPreBroadcast?: boolean;
   /**
@@ -532,8 +531,8 @@ export async function streamMultiAgent(
       skill_stop_names: req.skillStopNames ?? [],
       // 仅 leader 用;综合轮让后端注入各席位完整交付正文。省略 → 后端按 false 处理。
       synthesis_mode: req.synthesisMode ?? false,
-      // 仅 leader 用;DAG 派活轮抑制预广播,避免总控派活 prompt 污染席位 thread。省略 → false。
-      suppress_pre_broadcast: req.suppressPreBroadcast ?? false,
+      // 总控 prompt 永不进入席位 thread；后端同样强制执行，避免旧调用方破坏角色隔离。
+      suppress_pre_broadcast: req.suppressPreBroadcast ?? true,
       // 仅 special 用;DAG 并行批次禁写文件(seat_parallel policy)。省略 → 后端按 false 处理。
       parallel_no_file: req.parallelNoFile ?? false,
       // 仅 special 用;前序席位完整交付,后端注入 context 供 read_peer_delivery 按需取全文。
diff --git a/offline-backend-20260512/backend/app/gateway/roundtable_inprocess_gateway.py b/offline-backend-20260512/backend/app/gateway/roundtable_inprocess_gateway.py
index 6558f3e7..e30497db 100644
--- a/offline-backend-20260512/backend/app/gateway/roundtable_inprocess_gateway.py
+++ b/offline-backend-20260512/backend/app/gateway/roundtable_inprocess_gateway.py
@@ -31,8 +31,7 @@ from app.gateway.roundtable_model_fallback import (
     reason_text,
 )
 from app.gateway.roundtable_run_policy import roundtable_run_policy
-from app.gateway.roundtable_seat_skills import append_seat_skill_directive
-from app.gateway.services import RUN_SCOPE_BACKGROUND_CHILD
+from app.gateway.roundtable_seat_skills import append_seat_role_boundary, append_seat_skill_directive
 from app.gateway.routers._roundtable_seed import (
     COORDINATOR_AGENT_ID,
     DASHBOARD_AGENT_ID,
@@ -40,6 +39,7 @@ from app.gateway.routers._roundtable_seed import (
     SUMMARY_AGENT_ID,
     ensure_roundtable_functional_agents,
 )
+from app.gateway.services import RUN_SCOPE_BACKGROUND_CHILD
 from deerflow.agents.roundtable_orchestrator.delivery import classify_seat_delivery, visible_seat_text
 from deerflow.agents.roundtable_orchestrator.report_json import extract_report_json
 from deerflow.agents.roundtable_orchestrator.types import (
@@ -806,6 +806,8 @@ class InProcessRoundtableGateway:
         seat_task = append_seat_skill_directive(
             agent_id, task, chain_enabled=bool(self._seat_skill_directives.get(agent_id, False))
         )
+        # 后台挂起路径与前台保持同一角色边界：席位只能执行具体任务，编排能力永远只属于总控。
+        seat_task = append_seat_role_boundary(seat_task)
         # 每席位「推理深度覆盖」：业务链条里给该席位单独配了 seatMode → 用该档派生的
         # thinking/reasoning/subagent **覆盖作业级**（self._seat_*）；未配则跟随作业级。
         # 作业级仍为 None 时落 policy 默认。与前端 useStep2Orchestration「覆盖优先、否则跟随
diff --git a/offline-backend-20260512/backend/app/gateway/roundtable_seat_skills.py b/offline-backend-20260512/backend/app/gateway/roundtable_seat_skills.py
index f5cad7a6..ab86d8b6 100644
--- a/offline-backend-20260512/backend/app/gateway/roundtable_seat_skills.py
+++ b/offline-backend-20260512/backend/app/gateway/roundtable_seat_skills.py
@@ -37,6 +37,22 @@ logger = logging.getLogger(__name__)
 _TRUTHY = frozenset({"1", "true", "yes", "on", "y"})
 _FALSY = frozenset({"0", "false", "no", "off", "n"})
 
+# 编排能力是圆桌总控的专属能力。两种拼写分别对应内置 tool 名和历史 custom skill
+# 目录名；席位侧无论 agent 配置或业务链条开关如何，都不得把它们暴露进技能强化提示。
+COORDINATOR_ONLY_SKILL_NAMES = frozenset({"agent_orchestration", "agent-orchestration"})
+
+_SEAT_ROLE_BOUNDARY = (
+    "【圆桌席位角色边界（最高优先级）】你是负责完成具体任务的执行席位，不是总控智能体。"
+    "编排、派活和调度其它智能体的能力只允许总控智能体使用。"
+    "你不得加载、读取或调用 agent_orchestration / agent-orchestration，"
+    "不得向其它智能体派活，也不要声称准备使用编排技能；请直接完成上方交给你的具体任务并提交结果。"
+)
+
+
+def append_seat_role_boundary(task: str) -> str:
+    """在席位本轮 human 消息末尾追加不可越权的角色边界。"""
+    return f"{task}\n\n---\n\n{_SEAT_ROLE_BOUNDARY}"
+
 
 def _master_enabled() -> bool:
     """``ROUNDTABLE_SEAT_SKILL_DIRECTIVE`` 总开关：默认放行（kill-switch）。
@@ -65,7 +81,11 @@ def build_seat_skill_directive(agent_id: str | None, *, chain_enabled: bool = Fa
         if not (agent_enabled or chain_enabled):
             return ""
 
-        configured = [name for name in (cfg.skills or []) if name] if cfg else []
+        configured = [
+            name
+            for name in (cfg.skills or [])
+            if name and name.strip().lower() not in COORDINATOR_ONLY_SKILL_NAMES
+        ] if cfg else []
         if not configured:
             return ""
 
diff --git a/offline-backend-20260512/backend/app/gateway/routers/multi_agent.py b/offline-backend-20260512/backend/app/gateway/routers/multi_agent.py
index 07f25a14..7c718cb2 100644
--- a/offline-backend-20260512/backend/app/gateway/routers/multi_agent.py
+++ b/offline-backend-20260512/backend/app/gateway/routers/multi_agent.py
@@ -25,8 +25,8 @@
 ------------------
 通过 ``_append_thread_message`` 向其它 thread 的 checkpoint ``messages`` 追加
 **只读上下文**的 human 消息（非触发 run），使各席位 LangGraph 状态里能看到
-总控派活/用户干预/子 agent 完成摘要。前端编排循环仍靠显式多次 ``/run/stream``
-驱动各 agent 真正推理。
+子 agent 完成摘要。总控输入、派活 prompt 和派活说明只留在总控 thread，
+绝不广播给席位；前端编排循环仍靠显式多次 ``/run/stream`` 驱动各 agent 真正推理。
 
 Leader 终态帧（前端 ``isFinalStatusFrame``）
 -------------------------------------------
@@ -48,7 +48,6 @@ Leader 终态帧（前端 ``isFinalStatusFrame``）
 from __future__ import annotations
 
 import asyncio
-import contextlib
 import json
 import logging
 import os
@@ -67,8 +66,7 @@ from langgraph.checkpoint.base import empty_checkpoint
 from app.gateway.roundtable_diag import record_foreground_diag
 from app.gateway.roundtable_model_fallback import fallback_model_chain, is_llm_error_message, reason_text
 from app.gateway.roundtable_run_policy import merge_skill_stop_names, roundtable_run_policy
-from app.gateway.services import RUN_SCOPE_ORCHESTRATION_CHILD, internal_run_scope_headers
-from app.gateway.roundtable_seat_skills import append_seat_skill_directive
+from app.gateway.roundtable_seat_skills import append_seat_role_boundary, append_seat_skill_directive
 from app.gateway.routers._roundtable_seed import (
     ACTION_PLAN_AGENT_ID,
     COORDINATOR_AGENT_ID,
@@ -78,6 +76,7 @@ from app.gateway.routers._roundtable_seed import (
     SUMMARY_AGENT_ID,
     ensure_roundtable_functional_agents,
 )
+from app.gateway.services import RUN_SCOPE_ORCHESTRATION_CHILD, internal_run_scope_headers
 from deerflow.agents.roundtable_orchestrator.delivery import classify_seat_delivery, visible_seat_text
 from deerflow.agents.roundtable_orchestrator.extraction_spec import build_summary_directive
 from deerflow.config import get_app_config
@@ -1554,16 +1553,15 @@ async def _leader_run(
     model_name: str,
     seat_meta: dict[str, dict[str, Any]] | None = None,
     synthesis_mode: bool = False,
-    suppress_pre_broadcast: bool = False,
+    suppress_pre_broadcast: bool = True,
     files: list[dict[str, Any]] | None = None,
 ) -> AsyncIterator[str | dict[str, Any]]:
     """总控（leader）单轮：透传上游 SSE + 末尾 yield 一个 dict 状态帧（由路由层 ``json.dumps``）。
 
     时序要点：
-    1. **预广播**（与 LLM 并行）：把用户/综合消息写入其它席位 thread，skip 总控自身；
+    1. 总控输入只进入总控 thread，绝不广播到席位 thread；
     2. 跑总控 thread 的 stream，yield 每一行原始 SSE；
-    3. 解析 messages → 澄清 / 空 dispatch（共识）/ 派活列表；
-    4. 若有派活，**派活广播**后再 yield ``{status: dispatched, ...}``。
+    3. 解析 messages → 澄清 / 空 dispatch（共识）/ 派活列表并返回。
 
     ``skill_stop_names`` 会与 ``agent_orchestration`` 合并，确保 middleware 在工具调用后停图。
 
@@ -1575,6 +1573,10 @@ async def _leader_run(
     ``synthesis_mode``：前端在「派活后让总控判断继续/综合」的轮次置真。为真时**额外**把各
     已交付席位的**完整交付正文**注入本轮输入(``_build_full_deliverables_block``),供总控写
     最终方案;平时(派活决策轮)只给摘要,让总控 thread 与每轮上下文保持精简、响应快。
+
+    ``suppress_pre_broadcast`` 仅为兼容旧客户端保留，服务端始终按抑制处理。角色隔离不能由
+    客户端布尔值决定：总控 prompt 可能含 ``agent_orchestration``，进入席位历史会诱导弱模型
+    模仿总控加载编排能力。
     """
     t0 = time.perf_counter()
     # 实读各席位 thread 的真实交付状态,构造「席位清单 + 客观交付状态(摘要)」块;综合轮再额外
@@ -1623,21 +1625,9 @@ async def _leader_run(
         part for part in (seat_status_block, full_deliverables_block, new_message) if part
     )
 
-    # 与上游 LLM 并行，减少「总控已开始想但席位 thread 里还没有用户消息」的窗口。
-    #
-    # ``suppress_pre_broadcast``：DAG「每 stage 派活轮」(方案 A)置真——此时 ``new_message`` 是
-    # 「请你作为总控…通过 agent_orchestration 派活给席位…」的**派活 prompt**,若广播进各席位
-    # thread,弱模型(deepseek)会从历史里捡到「派活」意图,**席位跟着模仿派活 / 绕道 bash 调
-    # 内部接口**(已观测 bug-1~4)。DAG 下席位的任务由前端 ``pickDagSeatTask`` 直接、干净地下发
-    # (含任务背景),此处不需要、也不应把总控的派活 prompt 播给席位。recommend/chain 不传该 flag,
-    # 行为不变。
-    pre_broadcast_task = (
-        None
-        if suppress_pre_broadcast
-        else asyncio.create_task(
-            _broadcast(client, base, headers, "总控智能体收到用户消息:" + new_message, agent_threads, [agent_name])
-        )
-    )
+    # 兼容旧请求字段但不再信任它。总控输入与派活说明始终只留在总控 thread；席位需要的上下文
+    # 由总控下发的具体 task、peer_deliveries 和席位交付广播提供。
+    _ = suppress_pre_broadcast
     thread_id = agent_threads[agent_name]
     # 角色参数取自单一数据源 roundtable_run_policy（leader：禁 web_search、停
     # agent_orchestration 图、关 thinking + low reasoning——短决策、首字节快）。
@@ -1677,7 +1667,7 @@ async def _leader_run(
     body = _mk_body(current_model)
     t_payload_built = time.perf_counter()
     logger.info(
-        "[leader-timing] %s payload_built=%.3fs (broadcast running in background)",
+        "[leader-timing] %s payload_built=%.3fs",
         agent_name,
         t_payload_built - t0,
     )
@@ -1733,27 +1723,8 @@ async def _leader_run(
                 "(expected on rollback preemption; otherwise check the upstream run's server-side error)",
                 agent_name,
             )
-            if pre_broadcast_task is not None:
-                with contextlib.suppress(Exception):
-                    await pre_broadcast_task
             return
 
-        # Pre-broadcast must finish before we yield the final status frame on any
-        # branch — the seats that get dispatched next rely on having seen the
-        # original user message. Only await it once (first attempt); the rare
-        # self-correction retry reuses the same already-awaited broadcast.
-        if attempt == 0 and pre_broadcast_task is not None:
-            t_before_broadcast_await = time.perf_counter()
-            try:
-                await pre_broadcast_task
-            except Exception as exc:
-                logger.warning("pre-broadcast failed: %s", exc)
-            logger.info(
-                "[leader-timing] %s pre_broadcast_await=%.3fs (>0 means broadcast was still in flight after LLM finished)",
-                agent_name,
-                time.perf_counter() - t_before_broadcast_await,
-            )
-
         dispatch_msg = _find_dispatch_message(messages)
         leader_text = _flatten_content(dispatch_msg.get("content", ""))
         tool_calls = dispatch_msg.get("tool_calls") or []
@@ -1839,22 +1810,9 @@ async def _leader_run(
         # 非法 id 已被丢弃;若 roster 校验后无合法派活(且重试已用尽),退化为空共识,
         # 而不是把假 id 漏给前端再报 400。
         dispatched: list[list[str]] = [[sub_name, task_text] for sub_name, task_text in valid_dispatch]
-        # 关键路径优先:**先 yield 派活帧**,让前端立刻启动席位 special run;派活广播(告知
-        # 其它席位"总控给 X 派了什么活")改成 detached 后台任务,不再 await 阻塞 —— 否则广播
-        # 读写各席位巨大 thread 状态会卡几十秒,白白拖慢席位启动(见 _spawn_detached_broadcast)。
+        # 关键路径优先：yield 派活帧，让前端立刻启动席位 special run。总控派活说明不广播给
+        # 任何席位，避免席位从历史中模仿总控角色；席位间承上依靠完成交付广播 / peer_deliveries。
         yield {"status": dispatched, "content": leader_text, "agent_name": agent_name, "model_used": current_model}
-        # DAG 派活轮(suppress_pre_broadcast)同样**不**把「总控给 X 派活」广播给兄弟席位 ——
-        # 否则弱模型从历史里看到派活语句又会模仿派活(席位任务由前端 pickDagSeatTask 干净下发,
-        # 跨席位承上靠各 special run 的"完成交付"后广播,不需要这条派活广播)。recommend/chain 照旧。
-        if not suppress_pre_broadcast:
-            for sub_name, task_text in valid_dispatch:
-                _spawn_detached_broadcast(
-                    base,
-                    headers,
-                    f"总控智能体给{sub_name}派活,内容为:" + task_text,
-                    agent_threads,
-                    [agent_name, sub_name],
-                )
         return
 
 
@@ -1937,6 +1895,8 @@ async def _special_run(
     seat_message = new_message
     if role in ("seat", "seat_parallel"):
         seat_message = append_seat_skill_directive(agent_name, new_message, chain_enabled=seat_skill_directive)
+        # 角色边界放在所有技能强化之后，确保本轮最后一条指令明确：席位永远不能加载/调用编排能力。
+        seat_message = append_seat_role_boundary(seat_message)
     # 深链接业务规范（仅 summary 单例）：把该业务的「业务链完整性核对」指令拼进本轮任务，强制总结报告
     # 核对产出相对业务链完不完整。business_code 为空（普通会商）/ 非写实业务 → directive 为 ""，原样不变。
     elif role == "summary" and business_code:
@@ -2131,10 +2091,9 @@ async def run_multi_agent_stream(request: Request, payload: dict = Body(...)) ->
     # 置真,网关据此用 seat_parallel policy 额外禁 write_file/bash/str_replace(§4)。
     # 兼容 no_file 别名;缺省 False → 普通 seat,旧前端不传也不破坏。
     no_file: bool = bool(payload.get("parallel_no_file") or payload.get("no_file") or False)
-    # 抑制 leader 预广播(仅 leader 用):DAG「每 stage 派活轮」置真,避免把总控的派活 prompt
-    # 广播进席位 thread 让弱模型模仿派活(详见 _leader_run 的 suppress_pre_broadcast 注释)。
-    # 缺省 False,recommend/chain 行为不变。
-    suppress_pre_broadcast: bool = bool(payload.get("suppress_pre_broadcast") or False)
+    # 旧客户端兼容字段。服务端已强制隔离总控 thread，因此无论请求值为何都不会执行 leader→seat
+    # 广播；仍解析并透传只是保持调用签名稳定。
+    suppress_pre_broadcast: bool = bool(payload.get("suppress_pre_broadcast", True))
     # 前序席位完整交付(仅 special 用):前端 DAG stage>0 席位带上此前各阶段的全文,网关注入
     # run context,供 read_peer_delivery 工具按需取全文(平时只看广播摘要,§12.9)。规整成
     # [{name, content}] 且过滤空项;缺省 None。
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 53a338e4..8de25f82 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
@@ -40,7 +40,74 @@ logger = logging.getLogger(__name__)
 WRITING_SETUP_MAX_ROUNDS = 8
 REPORT_STRUCTURE_SETUP_MAX_ROUNDS = 8
 
-_ES_QUERY_ROUTING_OPEN_TAG = '<skill_routing skill="es_query">'
+_ES_QUERY_ROUTING_OPEN_TAG = '<skill_routing skill="es_query">'
+
+_SKILLS_BLOCKED_BY_EXCLUDED_TOOL: dict[str, frozenset[str]] = {
+    # 内置 tool 与历史 custom skill 目录存在两种拼写；禁用编排工具时两者都必须从系统提示和
+    # runtime skill allowlist 中消失，防止误配的席位仍看到「加载编排技能」。
+    "agent_orchestration": frozenset({"agent_orchestration", "agent-orchestration"}),
+}
+
+_ROUNDTABLE_COORDINATOR_AGENT_ID = "roundtable-coordinator"
+
+_NON_COORDINATOR_ORCHESTRATION_BOUNDARY = """
+<orchestration_capability_boundary>
+你不是多智能体圆桌总控，因此没有编排、派活或调度其它智能体的权限。
+不得加载、读取、检索或调用 agent_orchestration / agent-orchestration，
+不得声称准备使用编排技能；请直接完成当前问答或你的本职任务。
+</orchestration_capability_boundary>
+""".strip()
+
+
+def _enforce_coordinator_only_tool_exclusions(
+    agent_id: str | None,
+    excluded_tools: list[str] | None,
+) -> list[str] | None:
+    """Make orchestration unavailable to every agent except the fixed roundtable coordinator."""
+    if agent_id == _ROUNDTABLE_COORDINATOR_AGENT_ID:
+        return excluded_tools
+    effective = list(excluded_tools or [])
+    if "agent_orchestration" not in effective:
+        effective.append("agent_orchestration")
+    return effective
+
+
+def _append_orchestration_capability_boundary(system_prompt: str, agent_id: str | None) -> str:
+    """Reinforce the physical tool/skill gate in every non-coordinator system prompt."""
+    if agent_id == _ROUNDTABLE_COORDINATOR_AGENT_ID:
+        return system_prompt
+    return f"{system_prompt}\n\n{_NON_COORDINATOR_ORCHESTRATION_BOUNDARY}"
+
+
+def _filter_available_skills_for_excluded_tools(
+    available_skills: list[str] | None,
+    excluded_tools: list[str] | None,
+) -> list[str] | None:
+    """让工具级禁用同步收紧 skill allowlist，必要时把「全部」展开为安全列表。"""
+    if not excluded_tools:
+        return available_skills
+    excluded = {name.strip().lower() for name in excluded_tools if name}
+    blocked = {
+        skill_name
+        for tool_name, skill_names in _SKILLS_BLOCKED_BY_EXCLUDED_TOOL.items()
+        if tool_name in excluded
+        for skill_name in skill_names
+    }
+    if not blocked:
+        return available_skills
+    if available_skills is None:
+        # ``None`` 原本表示「全部启用技能可见」，无法表达「除了总控专属技能之外的全部」。
+        # 此时显式展开存储中的启用技能；扫描失败则 fail closed，避免角色隔离失效。
+        try:
+            from deerflow.skills.storage import get_or_new_skill_storage
+
+            available_skills = [
+                skill.name for skill in get_or_new_skill_storage().load_skills(enabled_only=True)
+            ]
+        except Exception:  # noqa: BLE001
+            logger.warning("Failed to expand skills while applying excluded-tool boundary", exc_info=True)
+            available_skills = []
+    return [name for name in available_skills if name.strip().lower() not in blocked]
 
 
 def _log_es_query_routing_registration(
@@ -535,8 +602,11 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
 
         if not is_writing_mode_report_path(writing_artifact_path):
             writing_artifact_path = None
-    agent_id = validate_agent_id(cfg.get("agent_id") or cfg.get("agent_name"))
-    requested_excluded_tools = cfg.get("excluded_tools") or None
+    agent_id = validate_agent_id(cfg.get("agent_id") or cfg.get("agent_name"))
+    requested_excluded_tools = _enforce_coordinator_only_tool_exclusions(
+        agent_id,
+        cfg.get("excluded_tools") or None,
+    )
 
     try:
         agent_config = load_agent_config(agent_id) if not is_bootstrap and not is_writing_setup and not is_report_structure_setup else None
@@ -585,10 +655,14 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
 
     from deerflow.agents.deep_research.retrieval import merge_collector_skill_allowlist, runtime_extra_skills
 
-    runtime_available_skills = merge_collector_skill_allowlist(
-        agent_id, runtime_available_skills, runtime_extra_skills(cfg)
-    )
-    prompt_available_skills = set(runtime_available_skills) if runtime_available_skills is not None else None
+    runtime_available_skills = merge_collector_skill_allowlist(
+        agent_id, runtime_available_skills, runtime_extra_skills(cfg)
+    )
+    runtime_available_skills = _filter_available_skills_for_excluded_tools(
+        runtime_available_skills,
+        requested_excluded_tools,
+    )
+    prompt_available_skills = set(runtime_available_skills) if runtime_available_skills is not None else None
 
     config["metadata"].update(
         {
@@ -669,13 +743,14 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
         # Special bootstrap agent with minimal prompt for initial custom agent creation flow
         return create_agent(
             model=create_chat_model(name=model_name, thinking_enabled=thinking_enabled, force_disable_thinking=thinking_force_disabled, app_config=resolved_app_config),
-            tools=get_available_tools(
-                model_name=model_name,
-                subagent_enabled=subagent_enabled,
-                is_scheduled_run=cfg.get("is_scheduled_run", False),
-                excluded_tools=requested_excluded_tools,
-                app_config=resolved_app_config,
-            )
+            tools=get_available_tools(
+                model_name=model_name,
+                subagent_enabled=subagent_enabled,
+                is_scheduled_run=cfg.get("is_scheduled_run", False),
+                excluded_tools=requested_excluded_tools,
+                allow_agent_orchestration=agent_id == _ROUNDTABLE_COORDINATOR_AGENT_ID,
+                app_config=resolved_app_config,
+            )
             + [setup_agent],
             middleware=_build_middlewares(config, model_name=model_name, app_config=resolved_app_config),
             system_prompt=apply_prompt_template(
@@ -698,11 +773,12 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
     default_tools = get_available_tools(
         model_name=model_name,
         groups=agent_config.tool_groups if agent_config else None,
-        subagent_enabled=subagent_enabled,
-        is_scheduled_run=cfg.get("is_scheduled_run", False),
-        excluded_tools=requested_excluded_tools,
-        app_config=resolved_app_config,
-    )
+        subagent_enabled=subagent_enabled,
+        is_scheduled_run=cfg.get("is_scheduled_run", False),
+        excluded_tools=requested_excluded_tools,
+        allow_agent_orchestration=agent_id == _ROUNDTABLE_COORDINATOR_AGENT_ID,
+        app_config=resolved_app_config,
+    )
     if agent_id == FORCED_RESEARCH_AGENT_ID:
         default_tools = filter_forced_research_tools(default_tools)
     if is_notebook_mode:
@@ -744,8 +820,8 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
             writing_mode=writing_mode,
             writing_artifact_path=writing_artifact_path,
         )
-    else:
-        system_prompt = apply_prompt_template(
+    else:
+        system_prompt = apply_prompt_template(
             subagent_enabled=subagent_enabled,
             max_concurrent_subagents=max_concurrent_subagents,
             agent_id=agent_id,
@@ -758,10 +834,12 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
             rag_mode_enabled=rag_mode_enabled,
             is_notebook_mode=is_notebook_mode,
             notebook_source_ids=notebook_source_ids,
-            is_scheduled_run=bool(cfg.get("is_scheduled_run", False)),
-        )
-
-    _log_es_query_routing_registration(
+            is_scheduled_run=bool(cfg.get("is_scheduled_run", False)),
+        )
+
+    system_prompt = _append_orchestration_capability_boundary(system_prompt, agent_id)
+
+    _log_es_query_routing_registration(
         system_prompt=system_prompt,
         app_config=resolved_app_config,
         agent_id=agent_id,
diff --git a/offline-backend-20260512/backend/packages/harness/deerflow/sandbox/tools.py b/offline-backend-20260512/backend/packages/harness/deerflow/sandbox/tools.py
index 7d640a0b..838efdfc 100644
--- a/offline-backend-20260512/backend/packages/harness/deerflow/sandbox/tools.py
+++ b/offline-backend-20260512/backend/packages/harness/deerflow/sandbox/tools.py
@@ -1474,7 +1474,7 @@ def grep_tool(
 
 
 @tool("read_file", parse_docstring=True)
-def read_file_tool(
+def read_file_tool(
     runtime: ToolRuntime[ContextT, ThreadState],
     description: str,
     path: str,
@@ -1488,12 +1488,21 @@ def read_file_tool(
         path: The **absolute** path to the file to read.
         start_line: Optional starting line number (1-indexed, inclusive). Use with end_line to read a specific range.
         end_line: Optional ending line number (1-indexed, inclusive). Use with start_line to read a specific range.
-    """
-    try:
-        sandbox = ensure_sandbox_initialized(runtime)
-        ensure_thread_directories_exist(runtime)
-        requested_path = path
-        if is_local_sandbox(runtime):
+    """
+    try:
+        requested_path = path
+        if _is_skills_path(requested_path):
+            from deerflow.tools.builtins.skill_tools import (
+                _resolve_active_agent_id,
+                is_coordinator_only_skill_path,
+            )
+
+            if is_coordinator_only_skill_path(requested_path) and _resolve_active_agent_id(runtime) != "roundtable-coordinator":
+                # Match skill_view's non-leaking behavior: ordinary agents must not discover whether it exists.
+                return f"Error: File not found: {requested_path}"
+        sandbox = ensure_sandbox_initialized(runtime)
+        ensure_thread_directories_exist(runtime)
+        if is_local_sandbox(runtime):
             thread_data = get_thread_data(runtime)
             validate_local_tool_path(path, thread_data, read_only=True)
             if _is_skills_path(path):
diff --git a/offline-backend-20260512/backend/packages/harness/deerflow/tools/builtins/skill_tools.py b/offline-backend-20260512/backend/packages/harness/deerflow/tools/builtins/skill_tools.py
index 15a7024d..c4130891 100644
--- a/offline-backend-20260512/backend/packages/harness/deerflow/tools/builtins/skill_tools.py
+++ b/offline-backend-20260512/backend/packages/harness/deerflow/tools/builtins/skill_tools.py
@@ -9,6 +9,21 @@ from langchain.tools import ToolRuntime, tool
 
 logger = logging.getLogger(__name__)
 
+_ROUNDTABLE_COORDINATOR_AGENT_ID = "roundtable-coordinator"
+COORDINATOR_ONLY_SKILL_NAMES = frozenset({"agent_orchestration", "agent-orchestration"})
+
+
+def can_access_coordinator_only_skill(agent_id: str | None, skill_name: str) -> bool:
+    """Return whether this runtime identity may discover/read a reserved orchestration skill."""
+    normalized = (skill_name or "").strip().lower()
+    return normalized not in COORDINATOR_ONLY_SKILL_NAMES or agent_id == _ROUNDTABLE_COORDINATOR_AGENT_ID
+
+
+def is_coordinator_only_skill_path(path: str) -> bool:
+    """Recognize reserved skill directories in virtual/container paths."""
+    parts = {part.strip().lower() for part in (path or "").replace("\\", "/").split("/") if part}
+    return bool(parts & COORDINATOR_ONLY_SKILL_NAMES)
+
 
 def _resolve_active_agent_id(runtime: ToolRuntime | None) -> str | None:
     """Extract the agent_id under which the current tool call is running.
@@ -22,12 +37,13 @@ def _resolve_active_agent_id(runtime: ToolRuntime | None) -> str | None:
         return None
     try:
         if getattr(runtime, "context", None):
-            ctx_id = runtime.context.get("agent_id")
+            ctx_id = runtime.context.get("agent_id") or runtime.context.get("agent_name")
             if ctx_id:
                 return str(ctx_id)
         cfg = getattr(runtime, "config", None)
         if isinstance(cfg, dict):
-            cid = cfg.get("configurable", {}).get("agent_id")
+            configurable = cfg.get("configurable", {})
+            cid = configurable.get("agent_id") or configurable.get("agent_name")
             if cid:
                 return str(cid)
     except Exception:
@@ -61,7 +77,11 @@ def _load_agent_skill_whitelist(agent_id: str | None, extra_skills: list[str] |
         cfg = load_agent_config(agent_id)
         if cfg is None:
             return None
-        allowed = set(cfg.skills or [])
+        allowed = {
+            name
+            for name in (cfg.skills or [])
+            if can_access_coordinator_only_skill(agent_id, name)
+        }
     except Exception:
         logger.debug("Failed to load agent config for skill_list filter", exc_info=True)
         return None
@@ -137,6 +157,9 @@ def skill_view_impl(name: str, agent_id: str | None, extra_skills: list[str] | N
     guessing skill names. Replies "not found" rather than "forbidden" to
     avoid leaking which skills exist.
     """
+    if not can_access_coordinator_only_skill(agent_id, name):
+        return f"Skill '{name}' not found."
+
     from deerflow.skills.storage import get_or_new_skill_storage
     from deerflow.skills.usage import bump_view
 
@@ -151,6 +174,7 @@ def skill_view_impl(name: str, agent_id: str | None, extra_skills: list[str] | N
         elif storage.public_skill_exists(name):
             skill_file = storage.get_skills_root_path()
             from pathlib import Path
+
             from deerflow.skills.types import SKILL_MD_FILE
 
             path = Path(skill_file) / "public" / name / SKILL_MD_FILE
@@ -241,6 +265,8 @@ def search_skills_impl(query: str, agent_id: str | None, top_n: int = 5, extra_s
         base_path = _resolve_skills_container_base_path()
         scored: list[tuple[int, dict]] = []
         for skill in skills:
+            if not can_access_coordinator_only_skill(agent_id, skill.name):
+                continue
             entry = usage.get(skill.name, {})
             if allowed is not None:
                 if skill.name not in allowed:
@@ -331,6 +357,8 @@ def skill_list_impl(agent_id: str | None, extra_skills: list[str] | None = None)
         usage = all_entries()
         result = []
         for skill in skills:
+            if not can_access_coordinator_only_skill(agent_id, skill.name):
+                continue
             entry = usage.get(skill.name, {})
             if allowed is not None:
                 # 自定义 agent:严格按 config.yaml 的 skills 白名单过滤。
diff --git a/offline-backend-20260512/backend/packages/harness/deerflow/tools/tools.py b/offline-backend-20260512/backend/packages/harness/deerflow/tools/tools.py
index a7575792..457de383 100644
--- a/offline-backend-20260512/backend/packages/harness/deerflow/tools/tools.py
+++ b/offline-backend-20260512/backend/packages/harness/deerflow/tools/tools.py
@@ -16,11 +16,10 @@ BROWSER_ACT_TOOL_USE = "deerflow.tools.builtins.browser_act_tool:browser_act_too
 BROWSER_CONTEXT_TOOL_USES = {BROWSER_CONTEXT_TOOL_USE, BROWSER_ACT_TOOL_USE}
 BROWSER_CONTEXT_TOOL_NAMES = {"browser_fetch_page", "browser_act"}
 
-BUILTIN_TOOLS = [
-    present_file_tool,
-    ask_clarification_tool,
-    agent_orchestration_tool,
-]
+BUILTIN_TOOLS = [
+    present_file_tool,
+    ask_clarification_tool,
+]
 
 SUBAGENT_TOOLS = [
     task_tool,
@@ -39,24 +38,36 @@ def _is_host_bash_tool(tool: object) -> bool:
     return False
 
 
-def _is_browser_context_tool(tool: object) -> bool:
+def _is_browser_context_tool(tool: object) -> bool:
     """Return True if the tool config represents the browser extension bridge."""
 
     use = getattr(tool, "use", None)
     name = getattr(tool, "name", None)
-    return use in BROWSER_CONTEXT_TOOL_USES or name in BROWSER_CONTEXT_TOOL_NAMES
+    return use in BROWSER_CONTEXT_TOOL_USES or name in BROWSER_CONTEXT_TOOL_NAMES
+
+
+def _enforce_agent_orchestration_scope(
+    tools: list[BaseTool],
+    *,
+    allow_agent_orchestration: bool,
+) -> list[BaseTool]:
+    """Fail closed: only an explicitly authorized coordinator may receive orchestration."""
+    if allow_agent_orchestration:
+        return tools
+    return [tool for tool in tools if tool.name != "agent_orchestration"]
 
 
-def get_available_tools(
+def get_available_tools(
     groups: list[str] | None = None,
     include_mcp: bool = True,
     model_name: str | None = None,
     subagent_enabled: bool = False,
     is_scheduled_run: bool = False,
-    excluded_tools: list[str] | None = None,
-    *,
-    app_config: AppConfig | None = None,
-) -> list[BaseTool]:
+    excluded_tools: list[str] | None = None,
+    *,
+    allow_agent_orchestration: bool = False,
+    app_config: AppConfig | None = None,
+) -> list[BaseTool]:
     """Get all available tools from config.
 
     Note: MCP tools should be initialized at application startup using
@@ -67,9 +78,11 @@ def get_available_tools(
         include_mcp: Whether to include tools from MCP servers (default: True).
         model_name: Optional model name to determine if vision tools should be included.
         subagent_enabled: Whether to include subagent tools (task, task_status).
-        excluded_tools: Optional list of tool names to exclude from the result
-            (applied AFTER all other resolution). Takes precedence over
-            ``app_config.excluded_tools``.
+        excluded_tools: Optional list of tool names to exclude from the result
+            (applied AFTER all other resolution). Takes precedence over
+            ``app_config.excluded_tools``.
+        allow_agent_orchestration: Explicit coordinator-only capability gate. Defaults to
+            ``False`` so ordinary agents and all indirect callers fail closed.
 
     Returns:
         List of available tools.
@@ -114,8 +127,10 @@ def get_available_tools(
 
     loaded_tools = [t for _, t in loaded_tools_raw]
 
-    # Conditionally add tools based on config
-    builtin_tools = BUILTIN_TOOLS.copy()
+    # Conditionally add tools based on config
+    builtin_tools = BUILTIN_TOOLS.copy()
+    if allow_agent_orchestration:
+        builtin_tools.append(agent_orchestration_tool)
     if not is_scheduled_run:
         builtin_tools.append(scheduled_task_tool)
 
@@ -292,4 +307,8 @@ def get_available_tools(
             )
         unique_tools = filtered_tools
 
-    return unique_tools
+    # Defense in depth: a config/MCP tool with the reserved name must not bypass the builtin gate.
+    return _enforce_agent_orchestration_scope(
+        unique_tools,
+        allow_agent_orchestration=allow_agent_orchestration,
+    )
diff --git a/offline-backend-20260512/backend/tests/test_roundtable_role_boundary.py b/offline-backend-20260512/backend/tests/test_roundtable_role_boundary.py
new file mode 100644
index 00000000..878451d7
--- /dev/null
+++ b/offline-backend-20260512/backend/tests/test_roundtable_role_boundary.py
@@ -0,0 +1,247 @@
+"""Roundtable coordinator/seat capability isolation regressions."""
+
+from __future__ import annotations
+
+from types import SimpleNamespace
+
+import pytest
+
+import app.gateway.roundtable_seat_skills as seat_skills
+import app.gateway.routers.multi_agent as multi_agent
+from deerflow.agents.lead_agent.agent import (
+    _append_orchestration_capability_boundary,
+    _enforce_coordinator_only_tool_exclusions,
+    _filter_available_skills_for_excluded_tools,
+)
+from deerflow.tools.builtins.skill_tools import (
+    _resolve_active_agent_id,
+    can_access_coordinator_only_skill,
+    is_coordinator_only_skill_path,
+    skill_view_impl,
+)
+from deerflow.tools.tools import _enforce_agent_orchestration_scope
+
+
+def _skill(name: str, description: str = "desc") -> SimpleNamespace:
+    return SimpleNamespace(
+        name=name,
+        description=description,
+        get_container_file_path=lambda base: f"{base}/custom/{name}/SKILL.md",
+    )
+
+
+def test_seat_skill_directive_never_exposes_coordinator_only_skills(monkeypatch) -> None:
+    """Even a misconfigured seat may see ordinary skills only, never orchestration."""
+    import deerflow.config as config_pkg
+    import deerflow.config.agents_config as agents_config
+    import deerflow.skills.storage as storage
+
+    monkeypatch.delenv("ROUNDTABLE_SEAT_SKILL_DIRECTIVE", raising=False)
+    monkeypatch.setattr(
+        agents_config,
+        "load_agent_config",
+        lambda agent_id: SimpleNamespace(
+            skills=["agent_orchestration", "knowledge-base-search", "agent-orchestration"],
+            seat_skill_directive=True,
+        ),
+    )
+    monkeypatch.setattr(
+        storage,
+        "get_or_new_skill_storage",
+        lambda: SimpleNamespace(
+            load_skills=lambda enabled_only=True: [
+                _skill("agent_orchestration"),
+                _skill("knowledge-base-search", "知识库检索"),
+                _skill("agent-orchestration"),
+            ]
+        ),
+    )
+    monkeypatch.setattr(
+        config_pkg,
+        "get_app_config",
+        lambda: SimpleNamespace(skills=SimpleNamespace(container_path="/mnt/skills")),
+    )
+
+    directive = seat_skills.build_seat_skill_directive("seat-1")
+    assert "knowledge-base-search" in directive
+    assert "agent_orchestration" not in directive
+    assert "agent-orchestration" not in directive
+
+
+def test_seat_role_boundary_is_the_last_instruction() -> None:
+    message = seat_skills.append_seat_role_boundary("完成风险分析")
+    assert message.startswith("完成风险分析\n\n---\n\n")
+    assert "不是总控智能体" in message
+    assert "不得加载、读取或调用 agent_orchestration" in message
+    assert message.endswith("请直接完成上方交给你的具体任务并提交结果。")
+
+
+def test_excluded_orchestration_tool_also_hides_orchestration_skills(monkeypatch) -> None:
+    """The system prompt/runtime allowlist must follow the tool-level seat policy."""
+    import deerflow.skills.storage as storage
+
+    skills = ["agent_orchestration", "knowledge-base-search", "agent-orchestration"]
+    assert _filter_available_skills_for_excluded_tools(skills, ["agent_orchestration"]) == [
+        "knowledge-base-search"
+    ]
+    assert _filter_available_skills_for_excluded_tools(skills, ["web_search"]) == skills
+    monkeypatch.setattr(
+        storage,
+        "get_or_new_skill_storage",
+        lambda: SimpleNamespace(load_skills=lambda enabled_only=True: [_skill(name) for name in skills]),
+    )
+    assert _filter_available_skills_for_excluded_tools(None, ["agent_orchestration"]) == [
+        "knowledge-base-search"
+    ]
+
+
+def test_single_agent_tool_exclusions_fail_closed_but_coordinator_is_allowed() -> None:
+    assert _enforce_coordinator_only_tool_exclusions("ordinary-agent", None) == [
+        "agent_orchestration"
+    ]
+    assert _enforce_coordinator_only_tool_exclusions(
+        "ordinary-agent", ["web_search", "agent_orchestration"]
+    ) == ["web_search", "agent_orchestration"]
+    assert _enforce_coordinator_only_tool_exclusions("roundtable-coordinator", None) is None
+
+
+def test_single_agent_system_prompt_forbids_orchestration_but_coordinator_prompt_does_not() -> None:
+    ordinary = _append_orchestration_capability_boundary("普通系统提示", "ordinary-agent")
+    coordinator = _append_orchestration_capability_boundary(
+        "总控系统提示", "roundtable-coordinator"
+    )
+    assert "没有编排、派活或调度其它智能体的权限" in ordinary
+    assert "不得加载、读取、检索或调用 agent_orchestration" in ordinary
+    assert coordinator == "总控系统提示"
+
+
+def test_tool_loader_cannot_leak_orchestration_to_ordinary_callers() -> None:
+    tools = [SimpleNamespace(name="read_file"), SimpleNamespace(name="agent_orchestration")]
+    ordinary = _enforce_agent_orchestration_scope(tools, allow_agent_orchestration=False)
+    coordinator = _enforce_agent_orchestration_scope(tools, allow_agent_orchestration=True)
+    assert [tool.name for tool in ordinary] == ["read_file"]
+    assert [tool.name for tool in coordinator] == ["read_file", "agent_orchestration"]
+
+
+def test_skill_discovery_and_direct_read_are_coordinator_only() -> None:
+    assert can_access_coordinator_only_skill("ordinary-agent", "agent-orchestration") is False
+    assert can_access_coordinator_only_skill("ordinary-agent", "agent_orchestration") is False
+    assert can_access_coordinator_only_skill("roundtable-coordinator", "agent-orchestration") is True
+    assert can_access_coordinator_only_skill(None, "knowledge-base-search") is True
+    assert skill_view_impl("agent-orchestration", "ordinary-agent") == (
+        "Skill 'agent-orchestration' not found."
+    )
+
+
+def test_runtime_agent_name_and_reserved_skill_paths_are_recognized() -> None:
+    runtime = SimpleNamespace(context={"agent_name": "ordinary-agent"}, config={})
+    assert _resolve_active_agent_id(runtime) == "ordinary-agent"
+    assert is_coordinator_only_skill_path("/mnt/skills/custom/agent-orchestration/SKILL.md") is True
+    assert is_coordinator_only_skill_path(r"C:\skills\public\agent_orchestration\SKILL.md") is True
+    assert is_coordinator_only_skill_path("/mnt/skills/public/pdf/SKILL.md") is False
+
+
+@pytest.mark.asyncio
+async def test_foreground_seat_run_receives_role_boundary(monkeypatch) -> None:
+    """The foreground special-run path must put the boundary in the actual human turn."""
+    seen: dict[str, str] = {}
+
+    async def _fake_stream(client, base, headers, thread_id, body):
+        seen["message"] = body["input"]["messages"][0]["content"][0]["text"]
+        yield None, ['data: {"messages":[{"type":"ai","content":"风险交付"}]}']
+
+    monkeypatch.setattr(multi_agent, "_stream_upstream", _fake_stream)
+    monkeypatch.setattr(multi_agent, "fallback_model_chain", lambda model: [model])
+    monkeypatch.setattr(multi_agent, "append_seat_skill_directive", lambda agent_id, task, **kwargs: task)
+    monkeypatch.setattr(multi_agent, "_spawn_detached_broadcast", lambda *args, **kwargs: None)
+
+    frames = [
+        frame
+        async for frame in multi_agent._special_run(
+            client=object(),
+            base="http://gateway",
+            headers={},
+            agent_threads={"seat-a": "seat-thread"},
+            agent_name="seat-a",
+            new_message="完成风险分析",
+            skill_stop_names=[],
+            model_name="test-model",
+        )
+    ]
+
+    assert "不是总控智能体" in seen["message"]
+    assert "不得加载、读取或调用 agent_orchestration" in seen["message"]
+    assert frames[-1]["content"] == "风险交付"
+
+
+@pytest.mark.asyncio
+async def test_background_seat_run_receives_role_boundary(monkeypatch) -> None:
+    """The in-process/background path must enforce the same seat boundary."""
+    import app.gateway.roundtable_inprocess_gateway as gateway_module
+
+    gateway = gateway_module.InProcessRoundtableGateway(
+        SimpleNamespace(state=SimpleNamespace()),
+        user_id="u1",
+        agents=[],
+    )
+    seen: dict[str, str] = {}
+
+    async def _fake_turn(**kwargs):
+        seen["message"] = kwargs["message"]
+        return ([{"type": "ai", "content": "风险交付"}], [], "test-model")
+
+    monkeypatch.setattr(gateway, "_run_turn_with_fallback", _fake_turn)
+    monkeypatch.setattr(
+        gateway_module,
+        "append_seat_skill_directive",
+        lambda agent_id, task, **kwargs: task,
+    )
+
+    result = await gateway.run_seat(
+        thread_ids={"seat-a": "seat-thread"},
+        agent_id="seat-a",
+        task="完成风险分析",
+        model="test-model",
+    )
+
+    assert "不是总控智能体" in seen["message"]
+    assert "不得加载、读取或调用 agent_orchestration" in seen["message"]
+    assert result.final_text == "风险交付"
+
+
+@pytest.mark.asyncio
+async def test_leader_never_broadcasts_orchestration_prompts_to_seats(monkeypatch) -> None:
+    """Old clients cannot re-enable leader-to-seat prompt broadcasts with a false flag."""
+    captured = [
+        'data: {"messages":[{"type":"ai","content":"已派活",'
+        '"tool_calls":[{"name":"agent_orchestration","args":'
+        '{"agent_name":"seat-a","task":"分析风险"}}]}]}'
+    ]
+
+    async def _fake_stream(*args, **kwargs):
+        yield None, captured
+
+    def _unexpected_broadcast(*args, **kwargs):
+        raise AssertionError("leader content must not be broadcast to seat threads")
+
+    monkeypatch.setattr(multi_agent, "_stream_upstream", _fake_stream)
+    monkeypatch.setattr(multi_agent, "fallback_model_chain", lambda model: [model])
+    monkeypatch.setattr(multi_agent, "_broadcast", _unexpected_broadcast)
+    monkeypatch.setattr(multi_agent, "_spawn_detached_broadcast", _unexpected_broadcast)
+
+    frames = [
+        frame
+        async for frame in multi_agent._leader_run(
+            client=object(),
+            base="http://gateway",
+            headers={},
+            agent_threads={"roundtable-coordinator": "leader-thread", "seat-a": "seat-thread"},
+            agent_name="roundtable-coordinator",
+            new_message="请通过 agent_orchestration 派活",
+            skill_stop_names=[],
+            model_name="test-model",
+            suppress_pre_broadcast=False,
+        )
+    ]
+
+    assert frames[-1]["status"] == [["seat-a", "分析风险"]]