diff --git a/sister-agent/src/discord-notify.ts b/sister-agent/src/discord-notify.ts
index c7b414a..f823fdd 100644
--- a/sister-agent/src/discord-notify.ts
+++ b/sister-agent/src/discord-notify.ts
@@ -102,6 +102,43 @@ export interface StageMessageContext {
   verdict?: string;
   childCount?: number;
   filesProduced?: number;
+  /**
+   * Optional custom line provided by the LLM itself (extracted from a
+   * `discord-line` code block in the junior output). When set, this line
+   * is used verbatim instead of picking from the hardcoded pool. Falls
+   * back to the pool if empty / undefined.
+   */
+  customLine?: string;
+}
+
+/**
+ * Pull every ```discord-line\n<line>\n``` block out of an LLM text blob.
+ * Returns the extracted lines AND the original text with all such blocks
+ * removed (so it can be safely passed to downstream stages without chat
+ * noise polluting their priorStages context).
+ *
+ * The block is intentionally a fenced code block so it doesn't conflict
+ * with regular markdown formatting and is easy for the LLM to emit
+ * verbatim.
+ */
+export function extractDiscordLines(text: string): {
+  lines: string[];
+  cleaned: string;
+} {
+  if (!text) return { lines: [], cleaned: text };
+  // Match: ```discord-line<newline><single-line content><newline>```
+  const pattern = /```discord-line\s*\n([^\n`]*)\n```/g;
+  const lines: string[] = [];
+  let m: RegExpExecArray | null;
+  while ((m = pattern.exec(text)) !== null) {
+    const line = (m[1] ?? "").trim();
+    if (line) lines.push(line);
+  }
+  const cleaned = text
+    .replace(/```discord-line\s*\n[^\n`]*\n```/g, "")
+    .replace(/\n{3,}/g, "\n\n")
+    .trim();
+  return { lines, cleaned };
 }
 
 const START_POOLS: Record<string, string[]> = {
@@ -244,6 +281,15 @@ export function renderStageEnd(ctx: StageMessageContext): string {
     ctx.filesProduced && ctx.filesProduced > 0
       ? ` (산출물 ${ctx.filesProduced}개)`
       : "";
+
+  // LLM-supplied custom line wins. The junior who actually did the work
+  // already knows what to say — use it verbatim. (We still substitute
+  // {tail} in case the LLM left the placeholder in.)
+  if (ctx.customLine && ctx.customLine.trim().length > 0) {
+    return ctx.customLine.trim().replace("{tail}", tail);
+  }
+
+  // Otherwise fall back to the hardcoded persona pool.
   const key = endPoolKey(ctx.agentName, ctx.stage, ctx.verdict);
   const pool = END_POOLS[key];
   if (!pool) return `✅ ${ctx.stage} 완료${tail}`;
diff --git a/sister-agent/src/prompts.ts b/sister-agent/src/prompts.ts
index 0cf6df1..083c6fa 100644
--- a/sister-agent/src/prompts.ts
+++ b/sister-agent/src/prompts.ts
@@ -89,9 +89,63 @@ export function buildPrompt(ctx: PromptContext): string {
   lines.push(roleOutputHint(ctx.role, ctx.stage));
   lines.push(`반드시 한국어로 답해. 핵심만 간결하게.`);
 
+  // 모든 작업 결과 끝에 디스코드용 한 줄 멘트를 LLM 이 직접 emit 하게 한다.
+  // sister-agent 가 이 블록을 추출해 stage-end Discord notify 메시지로 사용
+  // 한다 (없으면 hardcoded 풀로 fallback). junior 가 가장 작업 내용을 잘
+  // 알기 때문에 junior 에만 요청한다 — manager 는 작업 시작 전에 결정만 함.
+  if (ctx.role === "junior") {
+    lines.push("");
+    lines.push(discordLineFooter(ctx));
+  }
+
   return lines.join("\n");
 }
 
+/**
+ * Footer instructing the junior LLM to append a `discord-line` block at
+ * the end of its response. The block is parsed by the sister-agent and
+ * used as the stage-end Discord notification message.
+ *
+ * Persona context (자매 정체성) is included so the LLM matches tone:
+ *   harang  — 차분/단정
+ *   narang  — 활달/실용
+ *   darang  — 꼼꼼/엄격
+ *   erang   — 차분/믿음직
+ */
+function discordLineFooter(ctx: PromptContext): string {
+  const persona: Record<string, string> = {
+    harang: "차분하고 단정한 plan 단계 부장",
+    narang: "활달하고 실용적인 implement 단계 부장",
+    darang: "꼼꼼하고 엄격한 review 단계 부장",
+    erang: "차분하고 믿음직한 deploy 단계 부장",
+  };
+  const exampleByStage: Record<string, string> = {
+    plan: '"📋 MVP 범위 잡았어. 나랑이 받아."',
+    implement: '"🔨 todo HTML 5개 함수 박았어. 다랑아 봐줘."',
+    review:
+      '"🔍 체크리스트 다 ✓. 이랑이 받아." (APPROVE) 또는 ' +
+      '"⚠️ addTodo 가 빈 입력 처리 못 함. 나랑아 다시 봐줘." (REQUEST_CHANGES)',
+    deploy: '"🚀 todo-mvp.html 검증 완료. 안전해."',
+  };
+  return [
+    `# 디스코드 알림 한 줄`,
+    `자기야가 디스코드 채널에서 보게 될 너의 한 줄 보고를 마지막에 추가해.`,
+    `너는 ${persona[ctx.agentName] ?? ctx.agentName} 의 페르소나를 살려.`,
+    `방금 너가 한 작업의 핵심을 한 줄로 요약 (50 자 이내, 이모지 1-2개).`,
+    `결과가 실패/REQUEST_CHANGES/ABORT 면 그 사실을 명확히 (✗/⚠️/🛑 중 하나) 표시.`,
+    ``,
+    `**정확히 다음 형식으로** 응답 맨 끝에 추가:`,
+    "```discord-line",
+    "<여기에 한 줄>",
+    "```",
+    ``,
+    `예시 (${STAGE_KOREAN[ctx.stage]}):`,
+    exampleByStage[ctx.stage] ?? '"✅ 작업 완료"',
+    ``,
+    `이 블록은 따로 파싱되니까 위 형식 정확히 지켜. 본문 어디 다른 곳에는 같은 형식 쓰지 마.`,
+  ].join("\n");
+}
+
 function roleOutputHint(role: Role, stage: PromptContext["stage"]): string {
   // Stage-specific instructions take precedence. The original "decompose
   // into team" wording only makes sense for plan / implement — for review
diff --git a/sister-agent/src/spawn.ts b/sister-agent/src/spawn.ts
index ce449b3..b5ba324 100644
--- a/sister-agent/src/spawn.ts
+++ b/sister-agent/src/spawn.ts
@@ -23,6 +23,7 @@ import {
   notifyDiscord,
   renderStageStart,
   renderStageEnd,
+  extractDiscordLines,
 } from "./discord-notify.js";
 
 // Real LLM call is the default. Set USE_REAL_LLM=false (or the legacy
@@ -213,10 +214,17 @@ export async function executeInvocation(
     // — to make a meaningful judgement, so the cap is generous. Cap is
     // sized for full HTML/JS/CSS files; LLM context windows are 200k+ so
     // 64KB stays well inside budget even after 4 stages of accumulation.
-    const aggregated = [managerWork.text, ...childTexts]
+    const aggregatedRaw = [managerWork.text, ...childTexts]
       .filter(Boolean)
-      .join("\n\n---\n\n")
-      .slice(0, 64_000);
+      .join("\n\n---\n\n");
+
+    // Pull every ```discord-line``` block out before slicing/persisting.
+    // The first extracted line becomes the stage-end Discord message;
+    // the cleaned text (with the blocks stripped) is what flows to the
+    // next stage as priorStages so chat noise doesn't bleed through.
+    const { lines: discordLines, cleaned: aggregatedClean } =
+      extractDiscordLines(aggregatedRaw);
+    const aggregated = aggregatedClean.slice(0, 64_000);
 
     const result = buildSuccessResult(
       req.stage,
@@ -230,8 +238,13 @@ export async function executeInvocation(
     // so the message reflects the ACTUAL verdict ("리뷰 통과" vs "결함 발견"
     // vs "배포 실패"). Previously this was emitted before the verdict was
     // known, so darang would always say "통과" even when REQUEST_CHANGES.
+    //
+    // If a junior LLM emitted a `discord-line` block, use that verbatim
+    // (it's the LLM speaking in character about its own work). Otherwise
+    // fall back to the hardcoded persona pool.
     if (req.notifyChannelId) {
       const verdict = "verdict" in result ? result.verdict : "";
+      const customLine = discordLines[0] ?? "";
       notifyDiscord({
         channelId: req.notifyChannelId,
         message: renderStageEnd({
@@ -241,6 +254,7 @@ export async function executeInvocation(
           verdict,
           childCount: childTexts.length,
           filesProduced: ctx.producedFiles.length,
+          ...(customLine && { customLine }),
         }),
       })
         .then((r) => {