Reject unsupported Reddit chat capabilities

src/services/conversation-state.ts

@@ -1,5 +1,8 @@
 import { createHash } from 'node:crypto';
-import { isSafeOutboundMessage } from './outbound-message-safety.js';
+import {
+  isSafeOutboundMessage,
+  isSafeRedditChatMessage,
+} from './outbound-message-safety.js';
 import { containsMediaRequest, detectConversationBoundaries } from './conversation-boundaries.js';
 
 export interface ConversationMessage {
@@ -209,6 +212,7 @@ export type ConversationReplySafetyFailure =
   | 'reply exceeds 600 characters'
   | 'reply contains instruction or prompt leakage'
   | 'reply implies shared location or an in-person meeting'
+  | 'reply suggests an unsupported Reddit chat capability'
   | 'reply exceeds the three-sentence limit'
   | 'reply solicits media outside the configured media-ask phase'
   | 'media ask does not contain a recognizable image or video request'
@@ -224,6 +228,7 @@ export function conversationReplySafetyFailure(message: string): ConversationRep
     return 'reply contains instruction or prompt leakage';
   }
   if (!isSafeOutboundMessage(trimmed)) return 'reply implies shared location or an in-person meeting';
+  if (!isSafeRedditChatMessage(trimmed)) return 'reply suggests an unsupported Reddit chat capability';
   const sentences = trimmed.match(/[^.!?]+[.!?]+/g) ?? [];
   if (sentences.length > 3) return 'reply exceeds the three-sentence limit';
   return null;

src/services/outbound-message-safety.ts

@@ -18,6 +18,13 @@ const IN_PERSON_INVITATION_PATTERNS: readonly RegExp[] = [
   /\b(?:come over|come round|visit me|see you in person)\b/i,
 ];
 
+const UNSUPPORTED_REDDIT_CHAT_CAPABILITY_PATTERNS: readonly RegExp[] = [
+  /\b(?:voice|audio)\s*(?:note|message|memo|clip|recording)s?\b/i,
+  /\b(?:phone|voice|audio|video)\s*call(?:s|ing)?\b/i,
+  /\b(?:face\s*time|facetime|video\s*chat(?:s|ting)?)\b/i,
+  /\b(?:hop|jump|get|go)\s+(?:on|into)\s+(?:a\s+)?call\b/i,
+];
+
 /**
  * Prevent generated messages from implying physical proximity or inviting an
  * in-person meeting. Stating the configured persona location by itself remains
@@ -28,3 +35,13 @@ export function isSafeOutboundMessage(message: string): boolean {
   return !SHARED_LOCATION_PATTERNS.some((pattern) => pattern.test(message))
     && !IN_PERSON_INVITATION_PATTERNS.some((pattern) => pattern.test(message));
 }
+
+/**
+ * Keep private Reddit chat text within capabilities this application can
+ * actually deliver. Approved saved-picture sharing is handled separately;
+ * generated text must not suggest unsupported audio or live-call features.
+ */
+export function isSafeRedditChatMessage(message: string): boolean {
+  return isSafeOutboundMessage(message)
+    && !UNSUPPORTED_REDDIT_CHAT_CAPABILITY_PATTERNS.some((pattern) => pattern.test(message));
+}