diff --git a/docs/channels/discord.md b/docs/channels/discord.md
index 0f7b6ac7074..5587b598bc3 100644
--- a/docs/channels/discord.md
+++ b/docs/channels/discord.md
@@ -582,6 +582,7 @@ Default slash command settings:
     OpenClaw can stream draft replies by sending a temporary message and editing it as text arrives.
 
     - `channels.discord.streaming` controls preview streaming (`off` | `partial` | `block` | `progress`, default: `off`).
+    - Default stays `off` because Discord preview edits can hit rate limits quickly, especially when multiple bots or gateways share the same account or guild traffic.
     - `progress` is accepted for cross-channel consistency and maps to `partial` on Discord.
     - `channels.discord.streamMode` is a legacy alias and is auto-migrated.
     - `partial` edits a single preview message as tokens arrive.
diff --git a/docs/gateway/configuration-reference.md b/docs/gateway/configuration-reference.md
index 0e21e35538f..2a619a3a628 100644
--- a/docs/gateway/configuration-reference.md
+++ b/docs/gateway/configuration-reference.md
@@ -179,7 +179,7 @@ WhatsApp runs through the gateway's web channel (Baileys Web). It starts automat
       historyLimit: 50,
       replyToMode: "first", // off | first | all
       linkPreview: true,
-      streaming: "partial", // off | partial | block | progress (default: off)
+      streaming: "partial", // off | partial | block | progress (default: off; opt in explicitly to avoid preview-edit rate limits)
       actions: { reactions: true, sendMessage: true },
       reactionNotifications: "own", // off | own | all
       mediaMaxMb: 100,
diff --git a/extensions/discord/src/monitor/message-handler.process.test.ts b/extensions/discord/src/monitor/message-handler.process.test.ts
index fb0f0311a04..bb3e47c1287 100644
--- a/extensions/discord/src/monitor/message-handler.process.test.ts
+++ b/extensions/discord/src/monitor/message-handler.process.test.ts
@@ -537,6 +537,12 @@ describe("processDiscordMessage draft streaming", () => {
     expectSinglePreviewEdit();
   });
 
+  it("keeps preview streaming off by default when streaming is unset", async () => {
+    await runSingleChunkFinalScenario({ maxLinesPerMessage: 5 });
+    expect(editMessageDiscord).not.toHaveBeenCalled();
+    expect(deliverDiscordReply).toHaveBeenCalledTimes(1);
+  });
+
   it("falls back to standard send when final needs multiple chunks", async () => {
     await runSingleChunkFinalScenario({ streamMode: "partial", maxLinesPerMessage: 1 });
 
diff --git a/src/commands/doctor-legacy-config.test.ts b/src/commands/doctor-legacy-config.test.ts
index 89bc93bbcc7..8f4bf74e684 100644
--- a/src/commands/doctor-legacy-config.test.ts
+++ b/src/commands/doctor-legacy-config.test.ts
@@ -32,6 +32,23 @@ describe("normalizeCompatibilityConfigValues preview streaming aliases", () => {
     ]);
   });
 
+  it("explains why discord preview streaming stays off when legacy config resolves to off", () => {
+    const res = normalizeCompatibilityConfigValues({
+      channels: {
+        discord: {
+          streamMode: "off",
+        },
+      },
+    });
+
+    expect(res.config.channels?.discord?.streaming).toBe("off");
+    expect(res.config.channels?.discord?.streamMode).toBeUndefined();
+    expect(res.changes).toEqual([
+      "Moved channels.discord.streamMode → channels.discord.streaming (off).",
+      'channels.discord.streaming remains off by default to avoid Discord preview-edit rate limits; set channels.discord.streaming="partial" to opt in explicitly.',
+    ]);
+  });
+
   it("normalizes slack boolean streaming aliases to enum and native streaming", () => {
     const res = normalizeCompatibilityConfigValues({
       channels: {
diff --git a/src/commands/doctor-legacy-config.ts b/src/commands/doctor-legacy-config.ts
index 36c86bc0315..58eff1d0382 100644
--- a/src/commands/doctor-legacy-config.ts
+++ b/src/commands/doctor-legacy-config.ts
@@ -142,6 +142,11 @@ export function normalizeCompatibilityConfigValues(cfg: OpenClawConfig): {
         `Normalized ${params.pathPrefix}.streaming (${beforeStreaming}) → (${resolved}).`,
       );
     }
+    if (params.pathPrefix.startsWith("channels.discord") && resolved === "off") {
+      changes.push(
+        `${params.pathPrefix}.streaming remains off by default to avoid Discord preview-edit rate limits; set ${params.pathPrefix}.streaming="partial" to opt in explicitly.`,
+      );
+    }
 
     return { entry: updated, changed };
   };
diff --git a/src/config/discord-preview-streaming.test.ts b/src/config/discord-preview-streaming.test.ts
new file mode 100644
index 00000000000..1673ea5a82a
--- /dev/null
+++ b/src/config/discord-preview-streaming.test.ts
@@ -0,0 +1,14 @@
+import { describe, expect, it } from "vitest";
+import { resolveDiscordPreviewStreamMode } from "./discord-preview-streaming.js";
+
+describe("resolveDiscordPreviewStreamMode", () => {
+  it("defaults to off when unset", () => {
+    expect(resolveDiscordPreviewStreamMode({})).toBe("off");
+  });
+
+  it("preserves explicit off", () => {
+    expect(resolveDiscordPreviewStreamMode({ streaming: "off" })).toBe("off");
+    expect(resolveDiscordPreviewStreamMode({ streamMode: "off" })).toBe("off");
+    expect(resolveDiscordPreviewStreamMode({ streaming: false })).toBe("off");
+  });
+});
diff --git a/src/config/discord-preview-streaming.ts b/src/config/discord-preview-streaming.ts
index 79d7f8fd9b9..37e96e08bf3 100644
--- a/src/config/discord-preview-streaming.ts
+++ b/src/config/discord-preview-streaming.ts
@@ -104,6 +104,9 @@ export function resolveDiscordPreviewStreamMode(
   if (typeof params.streaming === "boolean") {
     return params.streaming ? "partial" : "off";
   }
+  // Discord preview streaming edits can hit aggressive rate limits, especially
+  // when multiple gateways or multiple bots share the same account/server. Keep
+  // the default off unless the operator opts in explicitly.
   return "off";
 }