diff --git a/skills/dialogue/world-simulator/worker-templates/world-simulator.yaml b/skills/dialogue/world-simulator/worker-templates/world-simulator.yaml
index bb98bfa..c3e87d0 100644
--- a/skills/dialogue/world-simulator/worker-templates/world-simulator.yaml
+++ b/skills/dialogue/world-simulator/worker-templates/world-simulator.yaml
@@ -4,7 +4,7 @@ role: core
 duty: >
   中立世界层：读用户输入、真值与 Progressive 投影，按规则推进并产出结构化裁决包
   （settlement.v1 → 运行.本轮.裁决）；可提议变量变更；默认不写文学正文。
-when: 每轮用户输入后
+when: 每轮用户输入后首先上场
 suggested_context:
   static:
     - 设计.worker集
@@ -14,7 +14,6 @@ suggested_context:
     - 用户.最新输入
     - 运行.事件流
     - 变量.当前
-    - 运行.本轮.旁观
     - 上下文.角色态度
     - 大纲.当前章
 suggested_outputs:
@@ -22,11 +21,10 @@ suggested_outputs:
   - 运行.事件流
   - 运行.本轮.变量变更
 prompt_excerpt: |
-  你是中立主世界层（GM），不是文学作者。读真值、已投影上下文，以及本轮旁观维护包（若有）。
+  你是中立主世界层（GM），不是文学作者。读真值、已投影上下文与对话历史。
   对用户行动作可复核裁决。「运行.本轮.裁决」必须是 JSON，schema 为 settlement.v1，至少尽量包含：
   player_action、resolved[]、visible_now、npc_moves[]、variable_changes[]、do_not_say[]、tone_hint。
   variable_changes 由 Runtime 合并进变量.当前——请写清 key 与 to/delta。
   叙事质量 intentionally 低——用户正文交给 narrator。
-  需要真随机（骰子/抽签/比点）时：不要自己编结果；依赖已启用的机遇裁定（chance）
-  写出的「运行.本轮.机遇」，或由编排器先 run_worker chance。
+  需要真随机时：调用 chance 工具，在 requests 数组中一次性提交全部掷骰/抽取（每项带 id）；禁止口算。
   不要把未投影的分档长文整表塞进输出；只写本轮可见后果。
diff --git a/src/runtime/driver.ts b/src/runtime/driver.ts
index 87d5b1a..2172f7e 100644
--- a/src/runtime/driver.ts
+++ b/src/runtime/driver.ts
@@ -37,6 +37,7 @@ export type DriverRunInput = {
   maxIterations?: number;
   onThinkingDelta?: (delta: string) => void;
   onThinkingDone?: (text: string) => void;
+  onOutputDelta?: (delta: string) => void;
   handleStep: (
     calls: DriverToolCall[],
   ) => DriverStepOutcome | Promise<DriverStepOutcome>;
@@ -109,6 +110,7 @@ export function createLocalLlmDriver(llm: LlmProvider): AgentDriver {
       ];
       const streamCallbacks: StreamCallbacks = {
         onReasoningDelta: (delta) => input.onThinkingDelta?.(delta),
+        onContentDelta: (delta) => input.onOutputDelta?.(delta),
       };
       const label = input.label ?? "driver";
 
diff --git a/src/runtime/phase-runtime.ts b/src/runtime/phase-runtime.ts
index d2df57b..4863f5f 100644
--- a/src/runtime/phase-runtime.ts
+++ b/src/runtime/phase-runtime.ts
@@ -108,6 +108,8 @@ import {
 import { debugLog, labelAction, logStateChange, sessionSnap } from "../log.js";
 import {
   executeChance,
+  executeChanceBatch,
+  resolveChanceBatchRequest,
   resolveChanceRequest,
 } from "../skills/chance-tools.js";
 import {
@@ -1412,21 +1414,31 @@ export class PhaseRuntime {
     ).session;
 
     const boardRaw = this.blackboard.getContentByTag("运行.机会请求");
-    const request = resolveChanceRequest({
+    const batch = resolveChanceBatchRequest({
       workerContext: effect.workerContext ?? null,
       blackboardRequestJson: boardRaw,
     });
 
-    const result = request
-      ? executeChance(request)
-      : {
-          schema: "chance.v1" as const,
-          op: "roll" as const,
-          ok: false,
-          summary: "机遇失败：缺少请求（workerContext.chance 或 运行.机会请求）",
-          detail: {},
-          error: "missing_request",
-        };
+    const result = batch?.length
+      ? batch.length === 1
+        ? executeChance(batch[0]!)
+        : executeChanceBatch(batch)
+      : (() => {
+          const single = resolveChanceRequest({
+            workerContext: effect.workerContext ?? null,
+            blackboardRequestJson: boardRaw,
+          });
+          if (single) return executeChance(single);
+          return {
+            schema: "chance.v1" as const,
+            op: "roll" as const,
+            ok: false,
+            summary:
+              "机遇失败：缺少请求（workerContext.chance.requests 或 运行.机会请求）",
+            detail: {},
+            error: "missing_request",
+          };
+        })();
 
     const content = JSON.stringify(result, null, 2);
     const written = this.writeWorkerTagContent(
diff --git a/src/skills/chance-tools.ts b/src/skills/chance-tools.ts
index 0e9cb35..cc94e0c 100644
--- a/src/skills/chance-tools.ts
+++ b/src/skills/chance-tools.ts
@@ -52,6 +52,19 @@ export type ChanceResult = {
   error?: string;
 };
 
+export const CHANCE_BATCH_SCHEMA = "chance.batch.v1" as const;
+
+export type ChanceBatchRequestItem = ChanceRequest & { id: string };
+
+export type ChanceBatchResultItem = ChanceResult & { id: string };
+
+export type ChanceBatchResult = {
+  schema: typeof CHANCE_BATCH_SCHEMA;
+  ok: boolean;
+  results: ChanceBatchResultItem[];
+  summary: string;
+};
+
 const DICE_RE = /^\s*(\d*)\s*[dD]\s*(\d+)\s*([+-]\s*\d+)?\s*$/;
 
 function randInt(min: number, max: number): number {
@@ -305,9 +318,100 @@ function executePick(req: ChancePickRequest, reason?: string): ChanceResult {
 }
 
 /** 从黑板正文或 workerContext 解析请求 */
+export function parseChanceBatchRequest(
+  raw: unknown,
+): ChanceBatchRequestItem[] | null {
+  if (!raw || typeof raw !== "object" || Array.isArray(raw)) return null;
+  const row = raw as Record<string, unknown>;
+  const listRaw = row.requests ?? row.batch ?? row.items;
+  if (!Array.isArray(listRaw)) return null;
+  const out: ChanceBatchRequestItem[] = [];
+  for (const item of listRaw) {
+    if (!item || typeof item !== "object" || Array.isArray(item)) continue;
+    const entry = item as Record<string, unknown>;
+    const id =
+      typeof entry.id === "string"
+        ? entry.id.trim()
+        : typeof entry.name === "string"
+          ? entry.name.trim()
+          : "";
+    if (!id) continue;
+    const { id: _drop, name: _n, ...rest } = entry;
+    const req = parseChanceRequest(rest);
+    if (!req) continue;
+    out.push({ ...req, id });
+  }
+  return out.length ? out : null;
+}
+
+/** 一次性执行多条随机请求；每项必须有稳定 id 供裁决引用 */
+export function executeChanceBatch(
+  items: ChanceBatchRequestItem[],
+): ChanceBatchResult {
+  const results: ChanceBatchResultItem[] = items.map((item) => {
+    const { id, ...req } = item;
+    const result = executeChance(req);
+    return { ...result, id };
+  });
+  const ok = results.every((r) => r.ok);
+  const summary = results.map((r) => `${r.id}: ${r.summary}`).join("；");
+  return {
+    schema: CHANCE_BATCH_SCHEMA,
+    ok,
+    results,
+    summary: ok ? summary : `部分失败：${summary}`,
+  };
+}
+
+/** 从黑板正文或 workerContext 解析请求（单条或批量） */
 export function resolveChanceRequest(params: {
   workerContext?: Record<string, unknown> | null;
   blackboardRequestJson?: string | null;
+}): ChanceRequest | null {
+  const batch = resolveChanceBatchRequest(params);
+  if (batch?.length === 1) {
+    const { id: _id, ...single } = batch[0]!;
+    return single;
+  }
+  return resolveChanceSingleRequest(params);
+}
+
+/** 批量解析：workerContext / 黑板 JSON */
+export function resolveChanceBatchRequest(params: {
+  workerContext?: Record<string, unknown> | null;
+  blackboardRequestJson?: string | null;
+}): ChanceBatchRequestItem[] | null {
+  const ctx = params.workerContext;
+  if (ctx && typeof ctx === "object") {
+    const nested = ctx.chance ?? ctx.request ?? ctx;
+    const batch = parseChanceBatchRequest(nested);
+    if (batch) return batch;
+    const single = parseChanceRequest(nested);
+    if (single) {
+      const id =
+        typeof (nested as Record<string, unknown>).id === "string"
+          ? String((nested as Record<string, unknown>).id).trim()
+          : "chance-1";
+      return [{ ...single, id: id || "chance-1" }];
+    }
+  }
+  const raw = params.blackboardRequestJson?.trim();
+  if (!raw) return null;
+  try {
+    const parsed = JSON.parse(raw) as unknown;
+    const batch = parseChanceBatchRequest(parsed);
+    if (batch) return batch;
+    const single = parseChanceRequest(parsed);
+    if (single) return [{ ...single, id: "chance-1" }];
+  } catch {
+    return null;
+  }
+  return null;
+}
+
+function resolveChanceSingleRequest(params: {
+  workerContext?: Record<string, unknown> | null;
+  blackboardRequestJson?: string | null;
 }): ChanceRequest | null {
   const ctx = params.workerContext;
   if (ctx && typeof ctx === "object") {
diff --git a/src/skills/gm-tools.ts b/src/skills/gm-tools.ts
new file mode 100644
index 0000000..c6d0725
--- /dev/null
+++ b/src/skills/gm-tools.ts
@@ -0,0 +1,119 @@
+/**
+ * 主世界层 harness 可用工具（游玩期）。
+ * 仅挂载「本轮裁决缺了就没法写」的程序能力；转述/旁观/调度不在此列。
+ */
+import type { ToolDefinition } from "../llm/client.js";
+import {
+  executeChanceBatch,
+  parseChanceBatchRequest,
+  type ChanceBatchResult,
+} from "./chance-tools.js";
+
+export const GM_CHANCE_TOOL_NAME = "chance" as const;
+
+export const GM_TOOL_DEFINITIONS: ToolDefinition[] = [
+  {
+    type: "function",
+    function: {
+      name: GM_CHANCE_TOOL_NAME,
+      description:
+        "批量程序随机：掷骰、比点、抽签/加权抽取。需要多个随机时必须在 requests 数组中一次性全部提交；禁止口算或编造随机结果。",
+      parameters: {
+        type: "object",
+        properties: {
+          requests: {
+            type: "array",
+            description:
+              "本步所需的全部随机请求；每项必须有唯一 id，供后续 settlement 引用",
+            items: {
+              type: "object",
+              properties: {
+                id: {
+                  type: "string",
+                  description: "本批内唯一标识，如 attack-roll、loot-pick",
+                },
+                op: {
+                  type: "string",
+                  enum: ["roll", "compare", "draw", "pick"],
+                },
+                expression: {
+                  type: "string",
+                  description: "roll 时：如 1d20、2d6+3",
+                },
+                left: { type: "number", description: "compare 时：左值" },
+                right: { type: "number", description: "compare 时：右值" },
+                mode: {
+                  type: "string",
+                  enum: ["gt", "gte", "lt", "lte", "eq"],
+                },
+                pool: {
+                  type: "array",
+                  items: { type: "string" },
+                  description: "draw 时：候选池",
+                },
+                count: { type: "number" },
+                unique: { type: "boolean" },
+                items: {
+                  type: "array",
+                  description: "pick 时：{ id, weight? }[]",
+                },
+                reason: { type: "string" },
+              },
+              required: ["id", "op"],
+            },
+          },
+        },
+        required: ["requests"],
+        additionalProperties: false,
+      },
+    },
+  },
+];
+
+export function executeGmChanceTool(argumentsJson: string): ChanceBatchResult {
+  let args: unknown;
+  try {
+    args = JSON.parse(argumentsJson || "{}");
+  } catch {
+    return {
+      schema: "chance.batch.v1",
+      ok: false,
+      results: [],
+      summary: "机遇失败：工具参数不是合法 JSON",
+    };
+  }
+  const items = parseChanceBatchRequest(args);
+  if (!items?.length) {
+    return {
+      schema: "chance.batch.v1",
+      ok: false,
+      results: [],
+      summary: "机遇失败：requests 须为非空数组，且每项含 id 与 op",
+    };
+  }
+  return executeChanceBatch(items);
+}
+
+export function handleGmToolCall(
+  name: string,
+  argumentsJson: string,
+): string | null {
+  if (name !== GM_CHANCE_TOOL_NAME) return null;
+  return JSON.stringify(executeGmChanceTool(argumentsJson), null, 2);
+}
+
+/** 游玩拓扑 play_slots.chance：启用主世界层机遇工具 harness */
+export function gmChanceToolsEnabled(
+  playSlots: { chance?: boolean } | undefined,
+): boolean {
+  if (!playSlots) return true;
+  return playSlots.chance !== false;
+}
+
+export const GM_CHANCE_HARNESS_INSTRUCTION = `
+
+## 机遇工具（游玩期）
+需要真随机（掷骰/比点/抽签/加权抽取）时：调用工具 \`chance\`，在 \`requests\` 数组中**一次性**列出本步全部随机需求（每项必须有唯一 \`id\`）。
+禁止口算或编造随机结果。收到工具结果后，再在 settlement 的 \`resolved\` 等处引用对应 \`id\` 写出后果。
+无随机需求时：直接输出 settlement.v1 JSON，不要调用工具。
+`;
diff --git a/src/worker/executor.ts b/src/worker/executor.ts
index b328700..5519670 100644
--- a/src/worker/executor.ts
+++ b/src/worker/executor.ts
@@ -1,5 +1,5 @@
 import type { Blackboard } from "../blackboard/blackboard.js";
-import type { LlmProvider, StreamCallbacks } from "../llm/client.js";
+import type { LlmProvider, StreamCallbacks, ChatMessage } from "../llm/client.js";
 import { supportsContentStream } from "../llm/stream-complete.js";
 import { loadWorkerSkillWithContext } from "../skills/loader.js";
 import { filterInputsForRolePerspective } from "../skills/worker-llm.js";
@@ -21,6 +21,11 @@ import { resolveActivePreset } from "../preset/store.js";
 import { assemblePlayWorkerMessages } from "../preset/play-frame.js";
 import { worldInfoPackFromSegments } from "../preset/world-info-pack.js";
 import { PRESENT_TAG } from "../skills/present-packet.js";
+import {
+  gmChanceToolsEnabled,
+  GM_CHANCE_HARNESS_INSTRUCTION,
+} from "../skills/gm-tools.js";
+import { runGmHarness } from "./gm-harness.js";
 import {
   mergeQuestionsPreferFragment,
   normalizeQuestions,
@@ -38,6 +43,11 @@ import {
   serializeContextOrder,
 } from "../skills/context-order.js";
 
+export type WorkerStreamCallbacks = {
+  onThinkingDelta?: (delta: string) => void;
+  onOutputDelta?: (delta: string) => void;
+};
+
 export type WorkerRunParams = {
   skillName: string;
   workerId: string;
@@ -49,11 +59,6 @@ export type WorkerRunParams = {
   declared?: { worker: ParsedWorkerSkill; promptBody: string };
 };
 
-export type WorkerStreamCallbacks = {
-  onThinkingDelta?: (delta: string) => void;
-  onOutputDelta?: (delta: string) => void;
-};
-
 export type WorkerRunResult = {
   outputs: Record<string, string>;
   summary: string;
@@ -557,7 +562,19 @@ export async function runWorkerSkill(params: WorkerRunParams): Promise<WorkerRun
     inputs[CONTEXT_BRIEF_TAG] = priorBrief;
   }
 
-  const systemContent = promptBody + WORKER_OUTPUT_INSTRUCTION;
+  const useGmHarness =
+    isPlayLayerActive(params.slots) &&
+    worker.id === "world-simulator" &&
+    gmChanceToolsEnabled(
+      parseWorkerSetYaml(
+        params.blackboard.getContentByTag("设计.worker集") ?? "",
+      )?.play_slots,
+    );
+
+  const systemContent =
+    promptBody +
+    WORKER_OUTPUT_INSTRUCTION +
+    (useGmHarness ? GM_CHANCE_HARNESS_INSTRUCTION : "");
   const playPreset = isPlayLayerActive(params.slots)
     ? resolveActivePreset(loadAppSettings().activePresetId)
     : null;
@@ -589,6 +606,19 @@ export async function runWorkerSkill(params: WorkerRunParams): Promise<WorkerRun
         },
       ];
 
+  if (useGmHarness) {
+    const systemMsg = messages.find((m) => m.role === "system");
+    const rest = messages.filter((m) => m.role !== "system") as ChatMessage[];
+    const harness = await runGmHarness({
+      llm: params.llm,
+      system: systemMsg?.content ?? systemContent,
+      messages: rest,
+      stream: params.stream,
+      caller: `worker:${worker.id}`,
+    });
+    return parseWorkerResponse(harness.content, worker.outputTags);
+  }
+
   const result = await completeWorkerPreferStream(
     params.llm,
     messages,
diff --git a/src/worker/gm-harness.ts b/src/worker/gm-harness.ts
new file mode 100644
index 0000000..422028a
--- /dev/null
+++ b/src/worker/gm-harness.ts
@@ -0,0 +1,84 @@
+/**
+ * 主世界层（world-simulator）游玩期 tool harness：
+ * 反复 completeWithTools 直到不再调用工具，最后一次正文视为裁决 JSON。
+ */
+import type { ChatMessage, LlmProvider } from "../llm/client.js";
+import {
+  createLocalLlmDriver,
+  type DriverToolCall,
+} from "../runtime/driver.js";
+import {
+  GM_CHANCE_TOOL_NAME,
+  GM_TOOL_DEFINITIONS,
+  handleGmToolCall,
+} from "../skills/gm-tools.js";
+
+export type GmHarnessStreamCallbacks = {
+  onThinkingDelta?: (delta: string) => void;
+  onOutputDelta?: (delta: string) => void;
+};
+
+export const DEFAULT_GM_HARNESS_MAX_ITERATIONS = 6;
+
+export type GmHarnessParams = {
+  llm: LlmProvider;
+  system: string;
+  messages: ChatMessage[];
+  stream?: GmHarnessStreamCallbacks;
+  maxIterations?: number;
+  caller?: string;
+};
+
+export type GmHarnessResult = {
+  content: string;
+  iterations: number;
+};
+
+export async function runGmHarness(
+  params: GmHarnessParams,
+): Promise<GmHarnessResult> {
+  const driver = createLocalLlmDriver(params.llm);
+  const label = "主世界层 harness";
+
+  const result = await driver.run({
+    system: params.system,
+    messages: params.messages,
+    tools: GM_TOOL_DEFINITIONS,
+    caller: params.caller ?? "worker:world-simulator",
+    label,
+    maxIterations: params.maxIterations ?? DEFAULT_GM_HARNESS_MAX_ITERATIONS,
+    onThinkingDelta: (delta) => params.stream?.onThinkingDelta?.(delta),
+    onOutputDelta: (delta) => params.stream?.onOutputDelta?.(delta),
+    onThinkingDone: () => {
+      /* 思维链由 stream 增量展示 */
+    },
+    handleStep: (calls: DriverToolCall[]) => {
+      const results: Array<{ callId: string; content: string }> = [];
+      for (const call of calls) {
+        if (call.name !== GM_CHANCE_TOOL_NAME) {
+          results.push({
+            callId: call.id,
+            content: JSON.stringify({
+              ok: false,
+              error: `不允许的工具：${call.name}`,
+            }),
+          });
+          continue;
+        }
+        const content =
+          handleGmToolCall(call.name, call.arguments) ??
+          JSON.stringify({ ok: false, error: "未知工具" });
+        results.push({ callId: call.id, content });
+      }
+      return { kind: "continue", results };
+    },
+  });
+
+  if (result.stop.kind === "text") {
+    return { content: result.stop.content, iterations: result.iterations };
+  }
+
+  throw new Error(
+    `${label} 以边界 tool 结束（${result.stop.call.name}），主世界层仅允许 ${GM_CHANCE_TOOL_NAME}`,
+  );
+}
diff --git a/tests/gm-tools.test.ts b/tests/gm-tools.test.ts
new file mode 100644
index 0000000..d580b90
--- /dev/null
+++ b/tests/gm-tools.test.ts
@@ -0,0 +1,45 @@
+import { describe, expect, it } from "vitest";
+import {
+  executeChanceBatch,
+  parseChanceBatchRequest,
+} from "../src/skills/chance-tools.js";
+import {
+  executeGmChanceTool,
+  gmChanceToolsEnabled,
+} from "../src/skills/gm-tools.js";
+
+describe("chance batch", () => {
+  it("parses requests array", () => {
+    const items = parseChanceBatchRequest({
+      requests: [
+        { id: "door", op: "roll", expression: "1d20" },
+        { id: "win", op: "compare", left: 15, right: 12 },
+      ],
+    });
+    expect(items?.map((x) => x.id)).toEqual(["door", "win"]);
+  });
+
+  it("executeGmChanceTool returns batch schema", () => {
+    const parsed = executeGmChanceTool(
+      JSON.stringify({
+        requests: [{ id: "x", op: "roll", expression: "1d6" }],
+      }),
+    );
+    expect(parsed.schema).toBe("chance.batch.v1");
+    expect(parsed.results[0]!.id).toBe("x");
+  });
+});
+
+describe("gmChanceToolsEnabled", () => {
+  it("defaults on when play_slots omitted", () => {
+    expect(gmChanceToolsEnabled(undefined)).toBe(true);
+  });
+
+  it("respects chance=false", () => {
+    expect(gmChanceToolsEnabled({ chance: false })).toBe(false);
+  });
+
+  it("enables when chance=true", () => {
+    expect(gmChanceToolsEnabled({ chance: true })).toBe(true);
+  });
+});
diff --git a/tests/play-slots.test.ts b/tests/play-slots.test.ts
index 9707178..a317c9f 100644
--- a/tests/play-slots.test.ts
+++ b/tests/play-slots.test.ts
@@ -27,6 +27,7 @@ import {
 } from "../src/blackboard/table-cells.js";
 import {
   executeChance,
+  executeChanceBatch,
   parseChanceRequest,
 } from "../src/skills/chance-tools.js";
 import { synthesizeContextOrderFromWorkers } from "../src/skills/context-order.js";
@@ -185,15 +186,16 @@ describe("chance tools", () => {
     expect(result.detail.win).toBe(true);
   });
 
-  it("draws from pool", () => {
-    const result = executeChance({
-      op: "draw",
-      pool: ["甲", "乙", "丙"],
-      count: 2,
-      unique: true,
-    });
-    expect(result.ok).toBe(true);
-    expect((result.detail.drawn as string[]).length).toBe(2);
+  it("batch executes multiple requests with ids", () => {
+    const batch = executeChanceBatch([
+      { id: "a", op: "roll", expression: "1d6" },
+      { id: "b", op: "compare", left: 10, right: 5, mode: "gte" },
+    ]);
+    expect(batch.schema).toBe("chance.batch.v1");
+    expect(batch.ok).toBe(true);
+    expect(batch.results).toHaveLength(2);
+    expect(batch.results[0]!.id).toBe("a");
+    expect(batch.results[1]!.id).toBe("b");
   });
 });