diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf4bbaf24..e0b04b119 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -41,6 +41,7 @@
 - Docs: clarify Slack manifest scopes (current vs optional) with references. Thanks @jarvis-medmatic for PR #235.
 - Control UI: avoid Slack config ReferenceError by reading slack config snapshots. Thanks @sreekaransrinath for PR #249.
 - Telegram: honor routing.groupChat.mentionPatterns for group mention gating. Thanks @regenrek for PR #242.
+- Auto-reply: block unauthorized `/reset` and infer WhatsApp senders from E.164 inputs.
 
 ### Maintenance
 - Deps: bump pi-* stack, Slack SDK, discord-api-types, file-type, zod, and Biome.
diff --git a/src/auto-reply/command-auth.ts b/src/auto-reply/command-auth.ts
index d48141802..7599c7390 100644
--- a/src/auto-reply/command-auth.ts
+++ b/src/auto-reply/command-auth.ts
@@ -18,16 +18,23 @@ export function resolveCommandAuthorization(params: {
 }): CommandAuthorization {
   const { ctx, cfg, commandAuthorized } = params;
   const surface = (ctx.Surface ?? "").trim().toLowerCase();
-  const isWhatsAppSurface =
-    surface === "whatsapp" ||
+  const from = (ctx.From ?? "").replace(/^whatsapp:/, "");
+  const to = (ctx.To ?? "").replace(/^whatsapp:/, "");
+  const hasWhatsappPrefix =
     (ctx.From ?? "").startsWith("whatsapp:") ||
     (ctx.To ?? "").startsWith("whatsapp:");
+  const looksLikeE164 = (value: string) =>
+    Boolean(value && /^\+?\d{3,}$/.test(value.replace(/[^\d+]/g, "")));
+  const inferWhatsApp =
+    !surface &&
+    Boolean(cfg.whatsapp?.allowFrom?.length) &&
+    (looksLikeE164(from) || looksLikeE164(to));
+  const isWhatsAppSurface =
+    surface === "whatsapp" || hasWhatsappPrefix || inferWhatsApp;
 
   const configuredAllowFrom = isWhatsAppSurface
     ? cfg.whatsapp?.allowFrom
     : undefined;
-  const from = (ctx.From ?? "").replace(/^whatsapp:/, "");
-  const to = (ctx.To ?? "").replace(/^whatsapp:/, "");
   const allowFromList =
     configuredAllowFrom?.filter((entry) => entry?.trim()) ?? [];
   const allowAll =
@@ -35,7 +42,9 @@ export function resolveCommandAuthorization(params: {
     allowFromList.length === 0 ||
     allowFromList.some((entry) => entry.trim() === "*");
 
-  const senderE164 = normalizeE164(ctx.SenderE164 ?? "");
+  const senderE164 = normalizeE164(
+    ctx.SenderE164 ?? (isWhatsAppSurface ? from : ""),
+  );
   const ownerCandidates =
     isWhatsAppSurface && !allowAll
       ? allowFromList.filter((entry) => entry !== "*")
diff --git a/src/auto-reply/reply/commands.ts b/src/auto-reply/reply/commands.ts
index dcfe6d769..21b65a91c 100644
--- a/src/auto-reply/reply/commands.ts
+++ b/src/auto-reply/reply/commands.ts
@@ -173,6 +173,7 @@ export async function handleCommands(params: {
   shouldContinue: boolean;
 }> {
   const {
+    ctx,
     cfg,
     command,
     directives,
@@ -193,6 +194,18 @@ export async function handleCommands(params: {
     isGroup,
   } = params;
 
+  const resetRequested =
+    command.commandBodyNormalized === "/reset" ||
+    command.commandBodyNormalized === "reset" ||
+    command.commandBodyNormalized === "/new" ||
+    command.commandBodyNormalized === "new";
+  if (resetRequested && !command.isAuthorizedSender) {
+    logVerbose(
+      `Ignoring /reset from unauthorized sender: ${command.senderE164 || "<unknown>"}`,
+    );
+    return { shouldContinue: false };
+  }
+
   const activationCommand = parseActivationCommand(
     command.commandBodyNormalized,
   );