diff --git a/src/slack/monitor/events/interactions.test.ts b/src/slack/monitor/events/interactions.test.ts
index 7b5f0d24f02..be47f6ac8a7 100644
--- a/src/slack/monitor/events/interactions.test.ts
+++ b/src/slack/monitor/events/interactions.test.ts
@@ -214,8 +214,8 @@ describe("registerSlackInteractionEvents", () => {
       value: "approved",
       userId: "U123",
       teamId: "T9",
-      triggerId: "123.trigger",
-      responseUrl: "https://hooks.slack.test/response",
+      triggerId: "[redacted]",
+      responseUrl: "[redacted]",
       channelId: "C1",
       messageTs: "100.200",
       threadTs: "100.100",
@@ -885,7 +885,7 @@ describe("registerSlackInteractionEvents", () => {
     };
     expect(payload).toMatchObject({
       actionType: "workflow_button",
-      workflowTriggerUrl: "https://slack.com/workflows/triggers/T420/12345",
+      workflowTriggerUrl: "[redacted]",
       workflowId: "Wf12345",
       teamId: "T420",
       channelId: "C420",
@@ -979,7 +979,7 @@ describe("registerSlackInteractionEvents", () => {
       rootViewId: "VROOT",
       previousViewId: "VPREV",
       externalId: "deploy-ext-1",
-      viewHash: "view-hash-1",
+      viewHash: "[redacted]",
       isStackedView: true,
     });
     expect(payload.inputs).toEqual(
@@ -1378,14 +1378,11 @@ describe("registerSlackInteractionEvents", () => {
       viewId: "V900",
       userId: "U900",
       isCleared: true,
-      privateMetadata: JSON.stringify({
-        sessionKey: "agent:main:slack:channel:C99",
-        userId: "U900",
-      }),
+      privateMetadata: "[redacted]",
       rootViewId: "VROOT900",
       previousViewId: "VPREV900",
       externalId: "deploy-ext-900",
-      viewHash: "view-hash-900",
+      viewHash: "[redacted]",
       isStackedView: true,
     });
     expect(payload.inputs).toEqual(
@@ -1426,5 +1423,64 @@ describe("registerSlackInteractionEvents", () => {
     expect(payload.interactionType).toBe("view_closed");
     expect(payload.isCleared).toBe(false);
   });
+
+  it("caps oversized interaction payloads with compact summaries", async () => {
+    enqueueSystemEventMock.mockClear();
+    const { ctx, getViewHandler } = createContext();
+    registerSlackInteractionEvents({ ctx: ctx as never });
+    const viewHandler = getViewHandler();
+    expect(viewHandler).toBeTruthy();
+
+    const richTextValue = {
+      type: "rich_text",
+      elements: Array.from({ length: 20 }, (_, index) => ({
+        type: "rich_text_section",
+        elements: [{ type: "text", text: `chunk-${index}-${"x".repeat(400)}` }],
+      })),
+    };
+    const values: Record<string, Record<string, unknown>> = {};
+    for (let index = 0; index < 20; index += 1) {
+      values[`block_${index}`] = {
+        [`input_${index}`]: {
+          type: "rich_text_input",
+          rich_text_value: richTextValue,
+        },
+      };
+    }
+
+    const ack = vi.fn().mockResolvedValue(undefined);
+    await viewHandler!({
+      ack,
+      body: {
+        user: { id: "U915" },
+        team: { id: "T1" },
+        view: {
+          id: "V915",
+          callback_id: "openclaw:oversize",
+          private_metadata: JSON.stringify({
+            channelId: "D915",
+            channelType: "im",
+            userId: "U915",
+          }),
+          state: {
+            values,
+          },
+        },
+      },
+    } as never);
+
+    expect(ack).toHaveBeenCalled();
+    expect(enqueueSystemEventMock).toHaveBeenCalledTimes(1);
+    const [eventText] = enqueueSystemEventMock.mock.calls[0] as [string];
+    expect(eventText.length).toBeLessThanOrEqual(2400);
+    const payload = JSON.parse(eventText.replace("Slack interaction: ", "")) as {
+      payloadTruncated?: boolean;
+      inputs?: unknown[];
+      inputsOmitted?: number;
+    };
+    expect(payload.payloadTruncated).toBe(true);
+    expect(Array.isArray(payload.inputs) ? payload.inputs.length : 0).toBeLessThanOrEqual(3);
+    expect((payload.inputsOmitted ?? 0) >= 1).toBe(true);
+  });
 });
 const selectedDateTimeEpoch = 1_771_632_300;
diff --git a/src/slack/monitor/events/interactions.ts b/src/slack/monitor/events/interactions.ts
index 54a9b0c1475..5f371dae2cd 100644
--- a/src/slack/monitor/events/interactions.ts
+++ b/src/slack/monitor/events/interactions.ts
@@ -8,6 +8,19 @@ import { escapeSlackMrkdwn } from "../mrkdwn.js";
 
 // Prefix for OpenClaw-generated action IDs to scope our handler
 const OPENCLAW_ACTION_PREFIX = "openclaw:";
+const SLACK_INTERACTION_EVENT_PREFIX = "Slack interaction: ";
+const REDACTED_INTERACTION_VALUE = "[redacted]";
+const SLACK_INTERACTION_EVENT_MAX_CHARS = 2400;
+const SLACK_INTERACTION_STRING_MAX_CHARS = 160;
+const SLACK_INTERACTION_ARRAY_MAX_ITEMS = 64;
+const SLACK_INTERACTION_COMPACT_INPUTS_MAX_ITEMS = 3;
+const SLACK_INTERACTION_REDACTED_KEYS = new Set([
+  "triggerId",
+  "responseUrl",
+  "workflowTriggerUrl",
+  "privateMetadata",
+  "viewHash",
+]);
 
 type InteractionMessageBlock = {
   type?: string;
@@ -107,6 +120,145 @@ type RegisterSlackModalHandler = (
   handler: (args: SlackModalEventHandlerArgs) => Promise<void>,
 ) => void;
 
+function truncateInteractionString(
+  value: string,
+  max = SLACK_INTERACTION_STRING_MAX_CHARS,
+): string {
+  const trimmed = value.trim();
+  if (trimmed.length <= max) {
+    return trimmed;
+  }
+  return `${trimmed.slice(0, max - 1)}…`;
+}
+
+function sanitizeSlackInteractionPayloadValue(value: unknown, key?: string): unknown {
+  if (value === undefined) {
+    return undefined;
+  }
+  if (key && SLACK_INTERACTION_REDACTED_KEYS.has(key)) {
+    if (typeof value !== "string" || value.trim().length === 0) {
+      return undefined;
+    }
+    return REDACTED_INTERACTION_VALUE;
+  }
+  if (typeof value === "string") {
+    return truncateInteractionString(value);
+  }
+  if (Array.isArray(value)) {
+    const sanitized = value
+      .slice(0, SLACK_INTERACTION_ARRAY_MAX_ITEMS)
+      .map((entry) => sanitizeSlackInteractionPayloadValue(entry))
+      .filter((entry) => entry !== undefined);
+    if (value.length > SLACK_INTERACTION_ARRAY_MAX_ITEMS) {
+      sanitized.push(`…+${value.length - SLACK_INTERACTION_ARRAY_MAX_ITEMS} more`);
+    }
+    return sanitized;
+  }
+  if (!value || typeof value !== "object") {
+    return value;
+  }
+  const output: Record<string, unknown> = {};
+  for (const [entryKey, entryValue] of Object.entries(value as Record<string, unknown>)) {
+    const sanitized = sanitizeSlackInteractionPayloadValue(entryValue, entryKey);
+    if (sanitized === undefined) {
+      continue;
+    }
+    if (typeof sanitized === "string" && sanitized.length === 0) {
+      continue;
+    }
+    if (Array.isArray(sanitized) && sanitized.length === 0) {
+      continue;
+    }
+    output[entryKey] = sanitized;
+  }
+  return output;
+}
+
+function buildCompactSlackInteractionPayload(
+  payload: Record<string, unknown>,
+): Record<string, unknown> {
+  const rawInputs = Array.isArray(payload.inputs) ? payload.inputs : [];
+  const compactInputs = rawInputs
+    .slice(0, SLACK_INTERACTION_COMPACT_INPUTS_MAX_ITEMS)
+    .flatMap((entry) => {
+      if (!entry || typeof entry !== "object") {
+        return [];
+      }
+      const typed = entry as Record<string, unknown>;
+      return [
+        {
+          actionId: typed.actionId,
+          blockId: typed.blockId,
+          actionType: typed.actionType,
+          inputKind: typed.inputKind,
+          selectedValues: typed.selectedValues,
+          selectedLabels: typed.selectedLabels,
+          inputValue: typed.inputValue,
+          inputNumber: typed.inputNumber,
+          selectedDate: typed.selectedDate,
+          selectedTime: typed.selectedTime,
+          selectedDateTime: typed.selectedDateTime,
+          richTextPreview: typed.richTextPreview,
+        },
+      ];
+    });
+
+  return {
+    interactionType: payload.interactionType,
+    actionId: payload.actionId,
+    callbackId: payload.callbackId,
+    actionType: payload.actionType,
+    userId: payload.userId,
+    teamId: payload.teamId,
+    channelId: payload.channelId ?? payload.routedChannelId,
+    messageTs: payload.messageTs,
+    threadTs: payload.threadTs,
+    viewId: payload.viewId,
+    isCleared: payload.isCleared,
+    selectedValues: payload.selectedValues,
+    selectedLabels: payload.selectedLabels,
+    selectedDate: payload.selectedDate,
+    selectedTime: payload.selectedTime,
+    selectedDateTime: payload.selectedDateTime,
+    workflowId: payload.workflowId,
+    routedChannelType: payload.routedChannelType,
+    inputs: compactInputs.length > 0 ? compactInputs : undefined,
+    inputsOmitted:
+      rawInputs.length > SLACK_INTERACTION_COMPACT_INPUTS_MAX_ITEMS
+        ? rawInputs.length - SLACK_INTERACTION_COMPACT_INPUTS_MAX_ITEMS
+        : undefined,
+    payloadTruncated: true,
+  };
+}
+
+function formatSlackInteractionSystemEvent(payload: Record<string, unknown>): string {
+  const toEventText = (value: Record<string, unknown>): string =>
+    `${SLACK_INTERACTION_EVENT_PREFIX}${JSON.stringify(value)}`;
+
+  const sanitizedPayload =
+    (sanitizeSlackInteractionPayloadValue(payload) as Record<string, unknown> | undefined) ?? {};
+  let eventText = toEventText(sanitizedPayload);
+  if (eventText.length <= SLACK_INTERACTION_EVENT_MAX_CHARS) {
+    return eventText;
+  }
+
+  const compactPayload = sanitizeSlackInteractionPayloadValue(
+    buildCompactSlackInteractionPayload(sanitizedPayload),
+  ) as Record<string, unknown>;
+  eventText = toEventText(compactPayload);
+  if (eventText.length <= SLACK_INTERACTION_EVENT_MAX_CHARS) {
+    return eventText;
+  }
+
+  return toEventText({
+    interactionType: sanitizedPayload.interactionType,
+    actionId: sanitizedPayload.actionId ?? "unknown",
+    userId: sanitizedPayload.userId,
+    channelId: sanitizedPayload.channelId ?? sanitizedPayload.routedChannelId,
+    payloadTruncated: true,
+  });
+}
+
 function readOptionValues(options: unknown): string[] | undefined {
   if (!Array.isArray(options)) {
     return undefined;
@@ -512,7 +664,7 @@ async function emitSlackModalLifecycleEvent(params: {
     return;
   }
 
-  enqueueSystemEvent(`Slack interaction: ${JSON.stringify(eventPayload)}`, {
+  enqueueSystemEvent(formatSlackInteractionSystemEvent(eventPayload), {
     sessionKey: sessionRouting.sessionKey,
     contextKey: [params.contextPrefix, callbackId, viewId, userId].filter(Boolean).join(":"),
   });
@@ -649,7 +801,7 @@ export function registerSlackInteractionEvents(params: { ctx: SlackMonitorContex
       const contextParts = ["slack:interaction", channelId, messageTs, actionId].filter(Boolean);
       const contextKey = contextParts.join(":");
 
-      enqueueSystemEvent(`Slack interaction: ${JSON.stringify(eventPayload)}`, {
+      enqueueSystemEvent(formatSlackInteractionSystemEvent(eventPayload), {
         sessionKey,
         contextKey,
       });