[Fix] Accept Discord button clicks and keep their task threads anchored

apps/api/src/handlers/discord/index.ts

@@ -169,6 +169,9 @@ async function processDiscordGatewayEvent(event: DiscordGatewayEvent) {
   const metadata = discordMetadataForChannel({
     channel,
     messageId: event.payload.id,
+    // Only a real channel message provides an anchor for the task thread;
+    // interactions (slash commands, buttons) do not.
+    ...(message?.id ? { anchorMessageId: message.id } : {}),
   });
 
   if (interaction?.type === 3) {

apps/api/src/handlers/discord/task-launch.ts

@@ -66,6 +66,12 @@ export async function resolveDiscordChannelContext(
 export function discordMetadataForChannel(input: {
   channel: DiscordChannelContext;
   messageId: string;
+  /**
+   * The real channel message that triggered the event — set only for
+   * message events. Interactions have no message a task thread could
+   * anchor to, so launches from them keep detached threads.
+   */
+  anchorMessageId?: string;
 }): DiscordEventCommunicationMetadata {
   return {
     communicationProvider: 'discord',
@@ -78,6 +84,9 @@ export function discordMetadataForChannel(input: {
     ...(input.channel.guildId
       ? { communicationGuildId: input.channel.guildId }
       : {}),
+    ...(input.anchorMessageId
+      ? { communicationAnchorMessageId: input.anchorMessageId }
+      : {}),
   };
 }
 

packages/communication/src/discord-event.ts

@@ -92,7 +92,11 @@ export const discordInteractionSchema = z
       .optional(),
     data: z
       .object({
-        id: z.string().optional(),
+        // Slash commands carry the command's snowflake here (a string);
+        // component interactions carry the numeric layout id of the pressed
+        // component. Real button clicks were rejected as invalid while the
+        // string-only shape was assumed.
+        id: z.union([z.string(), z.number()]).optional(),
         name: z.string().optional(),
         type: z.number().int().optional(),
         options: z.array(discordInteractionOptionSchema).optional(),