diff --git a/extensions/discord/src/monitor/inbound-dedupe.ts b/extensions/discord/src/monitor/inbound-dedupe.ts
index 5f7ab4a2c45..3169f735efc 100644
--- a/extensions/discord/src/monitor/inbound-dedupe.ts
+++ b/extensions/discord/src/monitor/inbound-dedupe.ts
@@ -69,5 +69,11 @@ export function releaseDiscordInboundReplay(params: {
 function normalizeDiscordInboundReplayKeys(
   replayKeys?: readonly (string | null | undefined)[],
 ): string[] {
-  return [...new Set((replayKeys ?? []).map((replayKey) => replayKey?.trim()).filter(Boolean))];
+  return [
+    ...new Set(
+      (replayKeys ?? [])
+        .map((replayKey) => replayKey?.trim())
+        .filter((replayKey): replayKey is string => Boolean(replayKey)),
+    ),
+  ];
 }
diff --git a/extensions/discord/src/monitor/message-handler.ts b/extensions/discord/src/monitor/message-handler.ts
index ab168faa622..c8735f50ec5 100644
--- a/extensions/discord/src/monitor/message-handler.ts
+++ b/extensions/discord/src/monitor/message-handler.ts
@@ -47,6 +47,10 @@ export type DiscordMessageHandlerWithLifecycle = DiscordMessageHandler & {
   deactivate: () => void;
 };
 
+function isNonEmptyString(value: string | undefined): value is string {
+  return typeof value === "string" && value.length > 0;
+}
+
 export function createDiscordMessageHandler(
   params: DiscordMessageHandlerParams,
 ): DiscordMessageHandlerWithLifecycle {
@@ -114,7 +118,7 @@ export function createDiscordMessageHandler(
       if (!last) {
         return;
       }
-      const replayKeys = entries.map((entry) => entry.replayKey).filter(Boolean);
+      const replayKeys = entries.map((entry) => entry.replayKey).filter(isNonEmptyString);
       const abortSignal = last.abortSignal;
       if (abortSignal?.aborted) {
         releaseDiscordInboundReplay({
@@ -177,7 +181,7 @@ export function createDiscordMessageHandler(
         }
         applyImplicitReplyBatchGate(ctx, params.replyToMode, true);
         if (entries.length > 1) {
-          const ids = entries.map((entry) => entry.data.message?.id).filter(Boolean) as string[];
+          const ids = entries.map((entry) => entry.data.message?.id).filter(isNonEmptyString);
           if (ids.length > 0) {
             const ctxBatch = ctx as typeof ctx & {
               MessageSids?: string[];
diff --git a/test/scripts/lint-suppressions.test.ts b/test/scripts/lint-suppressions.test.ts
index 9e459da7b5b..5e095b0d7d3 100644
--- a/test/scripts/lint-suppressions.test.ts
+++ b/test/scripts/lint-suppressions.test.ts
@@ -80,6 +80,7 @@ describe("production lint suppressions", () => {
     expect(summarizeSuppressions(collectProductionLintSuppressions())).toEqual([
       "extensions/browser/src/browser/pw-tools-core.interactions.ts|@typescript-eslint/no-implied-eval|2",
       "scripts/e2e/mcp-channels-harness.ts|unicorn/prefer-add-event-listener|1",
+      "src/agents/agent-scope-config.ts|no-control-regex|1",
       "src/agents/agent-scope.ts|no-control-regex|1",
       "src/agents/pi-embedded-runner/run/images.ts|no-control-regex|1",
       "src/agents/skills-clawhub.ts|no-control-regex|1",