diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71ee4c64e..649eac2d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ Docs: https://docs.openclaw.ai
 - Telegram/Agents: add inline button `style` support (`primary|success|danger`) across message tool schema, Telegram action parsing, send pipeline, and runtime prompt guidance. (#18241) Thanks @obviyus.
 - Telegram: surface user message reactions as system events, with configurable `channels.telegram.reactionNotifications` scope. (#10075) Thanks @Glucksberg.
 - Slack: add configurable streaming modes for draft previews. (#18555) Thanks @Solvely-Colin.
+- Slack: add native single-message text streaming with Slack `chat.startStream`/`appendStream`/`stopStream`; keep reply threading aligned with `replyToMode`, default streaming to enabled, and fall back to normal delivery when streaming fails. (#9972) Thanks @natedenh.
 - Slack: add external-select flow for large argument menus. (#18496) Thanks @Solvely-Colin.
 - Discord: expose native `/exec` command options (host/security/ask/node) so Discord slash commands get autocomplete and structured inputs. Thanks @thewilloftheshadow.
 - Discord: allow reusable interactive components with `components.reusable=true` so buttons, selects, and forms can be used multiple times before expiring. Thanks @thewilloftheshadow.
diff --git a/src/slack/monitor/message-handler/dispatch.streaming.test.ts b/src/slack/monitor/message-handler/dispatch.streaming.test.ts
new file mode 100644
index 000000000..58f4ba069
--- /dev/null
+++ b/src/slack/monitor/message-handler/dispatch.streaming.test.ts
@@ -0,0 +1,45 @@
+import { describe, expect, it } from "vitest";
+import { isSlackStreamingEnabled, resolveSlackStreamingThreadHint } from "./dispatch.js";
+
+describe("slack native streaming defaults", () => {
+  it("is enabled when config is undefined", () => {
+    expect(isSlackStreamingEnabled(undefined)).toBe(true);
+  });
+
+  it("can be disabled explicitly", () => {
+    expect(isSlackStreamingEnabled(false)).toBe(false);
+    expect(isSlackStreamingEnabled(true)).toBe(true);
+  });
+});
+
+describe("slack native streaming thread hint", () => {
+  it("stays off-thread when replyToMode=off and message is not in a thread", () => {
+    expect(
+      resolveSlackStreamingThreadHint({
+        replyToMode: "off",
+        incomingThreadTs: undefined,
+        messageTs: "1000.1",
+      }),
+    ).toBeUndefined();
+  });
+
+  it("uses first-reply thread when replyToMode=first", () => {
+    expect(
+      resolveSlackStreamingThreadHint({
+        replyToMode: "first",
+        incomingThreadTs: undefined,
+        messageTs: "1000.2",
+      }),
+    ).toBe("1000.2");
+  });
+
+  it("uses the existing incoming thread regardless of replyToMode", () => {
+    expect(
+      resolveSlackStreamingThreadHint({
+        replyToMode: "off",
+        incomingThreadTs: "2000.1",
+        messageTs: "1000.3",
+      }),
+    ).toBe("2000.1");
+  });
+});