diff --git a/src/auto-reply/reply/reply-flow.test.ts b/src/auto-reply/reply/reply-flow.test.ts
index b46cedc59aa..d7efa640b1c 100644
--- a/src/auto-reply/reply/reply-flow.test.ts
+++ b/src/auto-reply/reply/reply-flow.test.ts
@@ -627,7 +627,7 @@ describe("parseSlackDirectives", () => {
               text: "Approve",
               emoji: true,
             },
-            value: "approve",
+            value: "reply_1_approve",
           },
           {
             type: "button",
@@ -637,7 +637,7 @@ describe("parseSlackDirectives", () => {
               text: "Reject",
               emoji: true,
             },
-            value: "reject",
+            value: "reply_2_reject",
           },
         ],
       },
@@ -670,7 +670,7 @@ describe("parseSlackDirectives", () => {
                   text: "Alpha",
                   emoji: true,
                 },
-                value: "alpha",
+                value: "reply_1_alpha",
               },
               {
                 text: {
@@ -678,7 +678,7 @@ describe("parseSlackDirectives", () => {
                   text: "Beta",
                   emoji: true,
                 },
-                value: "beta",
+                value: "reply_2_beta",
               },
             ],
           },
@@ -719,7 +719,7 @@ describe("parseSlackDirectives", () => {
               text: "Retry",
               emoji: true,
             },
-            value: "retry",
+            value: "reply_1_retry",
           },
         ],
       },
@@ -751,7 +751,7 @@ describe("parseSlackDirectives", () => {
                   text: "Alpha",
                   emoji: true,
                 },
-                value: "alpha",
+                value: "reply_1_alpha",
               },
             ],
           },
@@ -776,7 +776,7 @@ describe("parseSlackDirectives", () => {
               text: "Retry",
               emoji: true,
             },
-            value: "retry",
+            value: "reply_1_retry",
           },
         ],
       },
@@ -858,6 +858,19 @@ describe("parseSlackDirectives", () => {
       },
     });
   });
+
+  it("ignores malformed existing Slack blocks during directive compilation", () => {
+    expect(() =>
+      parseSlackDirectives({
+        text: "Choose [[slack_buttons: Retry:retry]]",
+        channelData: {
+          slack: {
+            blocks: "{not json}",
+          },
+        },
+      }),
+    ).not.toThrow();
+  });
 });
 
 function createDeferred<T>() {
diff --git a/src/auto-reply/reply/reply-utils.test.ts b/src/auto-reply/reply/reply-utils.test.ts
index 4a15cf80064..88f092bf1e5 100644
--- a/src/auto-reply/reply/reply-utils.test.ts
+++ b/src/auto-reply/reply/reply-utils.test.ts
@@ -193,7 +193,7 @@ describe("normalizeReplyPayload", () => {
                   text: "Retry",
                   emoji: true,
                 },
-                value: "retry",
+                value: "reply_1_retry",
               },
               {
                 type: "button",
@@ -203,7 +203,7 @@ describe("normalizeReplyPayload", () => {
                   text: "Ignore",
                   emoji: true,
                 },
-                value: "ignore",
+                value: "reply_2_ignore",
               },
             ],
           },
diff --git a/src/auto-reply/reply/route-reply.test.ts b/src/auto-reply/reply/route-reply.test.ts
index d5ecbdd6f2f..5a0405da22b 100644
--- a/src/auto-reply/reply/route-reply.test.ts
+++ b/src/auto-reply/reply/route-reply.test.ts
@@ -230,6 +230,26 @@ describe("routeReply", () => {
     );
   });
 
+  it("does not bypass the empty-reply guard for invalid Slack blocks", async () => {
+    mocks.sendMessageSlack.mockClear();
+    const res = await routeReply({
+      payload: {
+        text: " ",
+        channelData: {
+          slack: {
+            blocks: " ",
+          },
+        },
+      },
+      channel: "slack",
+      to: "channel:C123",
+      cfg: {} as never,
+    });
+
+    expect(res.ok).toBe(true);
+    expect(mocks.sendMessageSlack).not.toHaveBeenCalled();
+  });
+
   it("does not derive responsePrefix from agent identity when routing", async () => {
     mocks.sendMessageSlack.mockClear();
     const cfg = {
diff --git a/src/auto-reply/reply/route-reply.ts b/src/auto-reply/reply/route-reply.ts
index e915308f39a..8b3319698b2 100644
--- a/src/auto-reply/reply/route-reply.ts
+++ b/src/auto-reply/reply/route-reply.ts
@@ -12,6 +12,7 @@ import { resolveEffectiveMessagesConfig } from "../../agents/identity.js";
 import { normalizeChannelId } from "../../channels/plugins/index.js";
 import type { OpenClawConfig } from "../../config/config.js";
 import { buildOutboundSessionContext } from "../../infra/outbound/session-context.js";
+import { parseSlackBlocksInput } from "../../slack/blocks-input.js";
 import { isSlackInteractiveRepliesEnabled } from "../../slack/interactive-replies.js";
 import { INTERNAL_MESSAGE_CHANNEL, normalizeMessageChannel } from "../../utils/message-channel.js";
 import type { OriginatingChannelType } from "../templating.js";
@@ -109,14 +110,22 @@ export async function routeReply(params: RouteReplyParams): Promise<RouteReplyRe
       ? [normalized.mediaUrl]
       : [];
   const replyToId = normalized.replyToId;
-  const hasSlackBlocks =
+  let hasSlackBlocks = false;
+  if (
     channel === "slack" &&
-    Boolean(
-      normalized.channelData?.slack &&
-      typeof normalized.channelData.slack === "object" &&
-      !Array.isArray(normalized.channelData.slack) &&
-      (normalized.channelData.slack as { blocks?: unknown }).blocks,
-    );
+    normalized.channelData?.slack &&
+    typeof normalized.channelData.slack === "object" &&
+    !Array.isArray(normalized.channelData.slack)
+  ) {
+    try {
+      hasSlackBlocks = Boolean(
+        parseSlackBlocksInput((normalized.channelData.slack as { blocks?: unknown }).blocks)
+          ?.length,
+      );
+    } catch {
+      hasSlackBlocks = false;
+    }
+  }
 
   // Skip empty replies.
   if (!text.trim() && mediaUrls.length === 0 && !hasSlackBlocks) {
diff --git a/src/auto-reply/reply/slack-directives.ts b/src/auto-reply/reply/slack-directives.ts
index 268adc56a67..79fa11eeb32 100644
--- a/src/auto-reply/reply/slack-directives.ts
+++ b/src/auto-reply/reply/slack-directives.ts
@@ -60,6 +60,15 @@ function parseChoices(raw: string, maxItems: number): SlackChoice[] {
     .slice(0, maxItems);
 }
 
+function buildSlackReplyChoiceToken(value: string, index: number): string {
+  const slug = value
+    .trim()
+    .toLowerCase()
+    .replace(/[^a-z0-9]+/g, "_")
+    .replace(/^_+|_+$/g, "");
+  return truncateSlackText(`reply_${index}_${slug || "choice"}`, SLACK_OPTION_VALUE_MAX);
+}
+
 function buildSectionBlock(text: string): SlackBlock | null {
   const trimmed = text.trim();
   if (!trimmed) {
@@ -82,7 +91,7 @@ function buildButtonsBlock(raw: string, index: number): SlackBlock | null {
   return {
     type: "actions",
     block_id: `openclaw_reply_buttons_${index}`,
-    elements: choices.map((choice) => ({
+    elements: choices.map((choice, choiceIndex) => ({
       type: "button",
       action_id: SLACK_REPLY_BUTTON_ACTION_ID,
       text: {
@@ -90,7 +99,7 @@ function buildButtonsBlock(raw: string, index: number): SlackBlock | null {
         text: truncateSlackText(choice.label, SLACK_PLAIN_TEXT_MAX),
         emoji: true,
       },
-      value: truncateSlackText(choice.value, SLACK_OPTION_VALUE_MAX),
+      value: buildSlackReplyChoiceToken(choice.value, choiceIndex + 1),
     })),
   };
 }
@@ -121,13 +130,13 @@ function buildSelectBlock(raw: string, index: number): SlackBlock | null {
           text: truncateSlackText(placeholder, SLACK_PLAIN_TEXT_MAX),
           emoji: true,
         },
-        options: choices.map((choice) => ({
+        options: choices.map((choice, choiceIndex) => ({
           text: {
             type: "plain_text",
             text: truncateSlackText(choice.label, SLACK_PLAIN_TEXT_MAX),
             emoji: true,
           },
-          value: truncateSlackText(choice.value, SLACK_OPTION_VALUE_MAX),
+          value: buildSlackReplyChoiceToken(choice.value, choiceIndex + 1),
         })),
       },
     ],
@@ -136,8 +145,12 @@ function buildSelectBlock(raw: string, index: number): SlackBlock | null {
 
 function readExistingSlackBlocks(payload: ReplyPayload): SlackBlock[] {
   const slackData = payload.channelData?.slack as SlackChannelData | undefined;
-  const blocks = parseSlackBlocksInput(slackData?.blocks) as SlackBlock[] | undefined;
-  return blocks ?? [];
+  try {
+    const blocks = parseSlackBlocksInput(slackData?.blocks) as SlackBlock[] | undefined;
+    return blocks ?? [];
+  } catch {
+    return [];
+  }
 }
 
 export function hasSlackDirectives(text: string): boolean {