diff --git a/extensions/speech-core/src/tts.test.ts b/extensions/speech-core/src/tts.test.ts
index 4d50ce1f9a0..a6acb589324 100644
--- a/extensions/speech-core/src/tts.test.ts
+++ b/extensions/speech-core/src/tts.test.ts
@@ -108,6 +108,7 @@ vi.mock("../api.js", async () => {
 
 const {
   _test,
+  buildTtsSystemPromptHint,
   getTtsPersona,
   getTtsProvider,
   maybeApplyTtsToPayload,
@@ -238,6 +239,18 @@ describe("speech-core native voice-note routing", () => {
     expect(_test.supportsNativeVoiceNoteTts(undefined)).toBe(false);
   });
 
+  it("tells generic TTS guidance to defer to MEMORY voice-delivery instructions", () => {
+    const hint = buildTtsSystemPromptHint(createTtsConfig("openclaw-speech-core-tts-hint-test"));
+
+    expect(hint).toContain("Voice (TTS) is enabled.");
+    expect(hint).toContain(
+      "If workspace context (especially MEMORY.md) tells you not to use [[tts:...]] or to use a local/non-tagged voice workflow, follow that workspace instruction instead.",
+    );
+    expect(hint).toContain(
+      "Use [[tts:...]] and optional [[tts:text]]...[[/tts:text]] to control voice/expressiveness.",
+    );
+  });
+
   it("marks Discord auto TTS replies as native voice messages", async () => {
     await expectTtsPayloadResult({
       channel: "discord",
diff --git a/extensions/speech-core/src/tts.ts b/extensions/speech-core/src/tts.ts
index af3a74c5ab6..0088279b90f 100644
--- a/extensions/speech-core/src/tts.ts
+++ b/extensions/speech-core/src/tts.ts
@@ -557,6 +557,7 @@ export function buildTtsSystemPromptHint(
       ? `Active TTS persona: ${persona.label ?? persona.id}${persona.description ? ` - ${persona.description}` : ""}.`
       : undefined,
     `Keep spoken text ≤${maxLength} chars to avoid auto-summary (summary ${summarize}).`,
+    "If workspace context (especially MEMORY.md) tells you not to use [[tts:...]] or to use a local/non-tagged voice workflow, follow that workspace instruction instead.",
     "Use [[tts:...]] and optional [[tts:text]]...[[/tts:text]] to control voice/expressiveness.",
   ]
     .filter(Boolean)
diff --git a/src/agents/system-prompt.test.ts b/src/agents/system-prompt.test.ts
index ff5361a3c9b..7ccbb2ddea9 100644
--- a/src/agents/system-prompt.test.ts
+++ b/src/agents/system-prompt.test.ts
@@ -734,6 +734,28 @@ describe("buildAgentSystemPrompt", () => {
     );
   });
 
+  it("adds MEMORY guidance when a memory file is present", () => {
+    const prompt = buildAgentSystemPrompt({
+      workspaceDir: "/tmp/openclaw",
+      contextFiles: [
+        {
+          path: "MEMORY.md",
+          content: "NEVER use [[tts:...]] or TTS commands; ALWAYS use local Piper.",
+        },
+      ],
+      ttsHint:
+        "Voice (TTS) is enabled.\nUse [[tts:...]] and optional [[tts:text]]...[[/tts:text]] to control voice/expressiveness.",
+    });
+
+    expect(prompt).toContain(
+      "MEMORY.md: durable user preferences and behavior guidance. Keep following it throughout the session unless higher-priority instructions override.",
+    );
+    expect(prompt.indexOf("NEVER use [[tts:...]]")).toBeGreaterThan(-1);
+    expect(prompt.lastIndexOf("## Voice (TTS)")).toBeGreaterThan(
+      prompt.indexOf("NEVER use [[tts:...]]"),
+    );
+  });
+
   it("omits project context when no context files are injected", () => {
     const prompt = buildAgentSystemPrompt({
       workspaceDir: "/tmp/openclaw",
diff --git a/src/agents/system-prompt.ts b/src/agents/system-prompt.ts
index 84f93346273..ca05ab8a80d 100644
--- a/src/agents/system-prompt.ts
+++ b/src/agents/system-prompt.ts
@@ -186,10 +186,18 @@ function buildProjectContextSection(params: {
     const hasSoulFile = params.files.some(
       (file) => getContextFileBasename(file.path) === "soul.md",
     );
+    const hasMemoryFile = params.files.some(
+      (file) => getContextFileBasename(file.path) === "memory.md",
+    );
     lines.push("The following project context files have been loaded:");
     if (hasSoulFile) {
       lines.push("SOUL.md: persona/tone. Follow it unless higher-priority instructions override.");
     }
+    if (hasMemoryFile) {
+      lines.push(
+        "MEMORY.md: durable user preferences and behavior guidance. Keep following it throughout the session unless higher-priority instructions override.",
+      );
+    }
     lines.push("");
   }
   for (const file of params.files) {