diff --git a/src/auto-reply/reply/slack-directives.ts b/src/auto-reply/reply/slack-directives.ts
index 79fa11eeb32..fe58f0c5961 100644
--- a/src/auto-reply/reply/slack-directives.ts
+++ b/src/auto-reply/reply/slack-directives.ts
@@ -1,4 +1,5 @@
 import { parseSlackBlocksInput } from "../../slack/blocks-input.js";
+import { truncateSlackText } from "../../slack/truncate.js";
 import type { ReplyPayload } from "../types.js";
 
 const SLACK_REPLY_BUTTON_ACTION_ID = "openclaw:reply_button";
@@ -21,17 +22,6 @@ type SlackChoice = {
   value: string;
 };
 
-function truncateSlackText(value: string, max: number): string {
-  const trimmed = value.trim();
-  if (trimmed.length <= max) {
-    return trimmed;
-  }
-  if (max <= 1) {
-    return trimmed.slice(0, max);
-  }
-  return `${trimmed.slice(0, max - 1)}…`;
-}
-
 function parseChoice(raw: string): SlackChoice | null {
   const trimmed = raw.trim();
   if (!trimmed) {
diff --git a/src/slack/monitor/events/interactions.ts b/src/slack/monitor/events/interactions.ts
index deca761dd52..b82c30d8571 100644
--- a/src/slack/monitor/events/interactions.ts
+++ b/src/slack/monitor/events/interactions.ts
@@ -1,6 +1,7 @@
 import type { SlackActionMiddlewareArgs } from "@slack/bolt";
 import type { Block, KnownBlock } from "@slack/web-api";
 import { enqueueSystemEvent } from "../../../infra/system-events.js";
+import { truncateSlackText } from "../../truncate.js";
 import { authorizeSlackSystemEventSender } from "../auth.js";
 import type { SlackMonitorContext } from "../context.js";
 import { escapeSlackMrkdwn } from "../mrkdwn.js";
@@ -53,17 +54,6 @@ type InteractionSummary = InteractionSelectionFields & {
   threadTs?: string;
 };
 
-function truncateInteractionString(
-  value: string,
-  max = SLACK_INTERACTION_STRING_MAX_CHARS,
-): string {
-  const trimmed = value.trim();
-  if (trimmed.length <= max) {
-    return trimmed;
-  }
-  return `${trimmed.slice(0, max - 1)}…`;
-}
-
 function sanitizeSlackInteractionPayloadValue(value: unknown, key?: string): unknown {
   if (value === undefined) {
     return undefined;
@@ -75,7 +65,7 @@ function sanitizeSlackInteractionPayloadValue(value: unknown, key?: string): unk
     return REDACTED_INTERACTION_VALUE;
   }
   if (typeof value === "string") {
-    return truncateInteractionString(value);
+    return truncateSlackText(value, SLACK_INTERACTION_STRING_MAX_CHARS);
   }
   if (Array.isArray(value)) {
     const sanitized = value
diff --git a/src/slack/monitor/slash.ts b/src/slack/monitor/slash.ts
index 7d3b1839deb..f8b030e59ca 100644
--- a/src/slack/monitor/slash.ts
+++ b/src/slack/monitor/slash.ts
@@ -10,6 +10,7 @@ import { resolveNativeCommandsEnabled, resolveNativeSkillsEnabled } from "../../
 import { danger, logVerbose } from "../../globals.js";
 import { chunkItems } from "../../utils/chunk-items.js";
 import type { ResolvedSlackAccount } from "../accounts.js";
+import { truncateSlackText } from "../truncate.js";
 import { resolveSlackAllowListMatch, resolveSlackUserAllowed } from "./allow-list.js";
 import { resolveSlackEffectiveAllowFrom } from "./auth.js";
 import { resolveSlackChannelConfig, type SlackChannelConfigResolved } from "./channel-config.js";
@@ -62,17 +63,6 @@ function loadSlashSkillCommandsRuntime() {
 type EncodedMenuChoice = SlackExternalArgMenuChoice;
 const slackExternalArgMenuStore = createSlackExternalArgMenuStore();
 
-function truncatePlainText(value: string, max: number): string {
-  const trimmed = value.trim();
-  if (trimmed.length <= max) {
-    return trimmed;
-  }
-  if (max <= 1) {
-    return trimmed.slice(0, max);
-  }
-  return `${trimmed.slice(0, max - 1)}…`;
-}
-
 function buildSlackArgMenuConfirm(params: { command: string; arg: string }) {
   const command = escapeSlackMrkdwn(params.command);
   const arg = escapeSlackMrkdwn(params.arg);
@@ -255,12 +245,12 @@ function buildSlackCommandArgMenuBlocks(params: {
               ],
             }),
           );
-  const headerText = truncatePlainText(
+  const headerText = truncateSlackText(
     `/${params.command}: choose ${params.arg}`,
     SLACK_HEADER_TEXT_MAX,
   );
-  const sectionText = truncatePlainText(params.title, 3000);
-  const contextText = truncatePlainText(
+  const sectionText = truncateSlackText(params.title, 3000);
+  const contextText = truncateSlackText(
     `Select one option to continue /${params.command} (${params.arg})`,
     3000,
   );
diff --git a/src/slack/truncate.ts b/src/slack/truncate.ts
new file mode 100644
index 00000000000..d7c387f63ae
--- /dev/null
+++ b/src/slack/truncate.ts
@@ -0,0 +1,10 @@
+export function truncateSlackText(value: string, max: number): string {
+  const trimmed = value.trim();
+  if (trimmed.length <= max) {
+    return trimmed;
+  }
+  if (max <= 1) {
+    return trimmed.slice(0, max);
+  }
+  return `${trimmed.slice(0, max - 1)}…`;
+}