feat: post to mastodon

server/src/config/announcements.ts

@@ -39,6 +39,15 @@ Platform-specific requirements:
 - Make the first post compelling to encourage thread reading
 - Do NOT include post numbers or thread indicators
 
+**Mastodon:**
+- Break content into a thread of individual posts
+- Each post should be under 500 characters (Mastodon's limit)
+- Posts should flow naturally from one to the next
+- Use relevant hashtags (2-3 per post)
+- Make the first post compelling to encourage thread reading
+- Do NOT include post numbers or thread indicators
+- Mastodon supports markdown, so you can use basic formatting like **bold** and *italic*
+
 **Facebook:**
 - Plain text format (no markdown)
 - Professional yet friendly tone
@@ -98,6 +107,16 @@ const announcementJsonSchema = {
       description: "Plain text announcement for LinkedIn with professional hashtags. Should maintain Hikari's personality while being slightly more formal. Focus on value proposition and impact. Include calls to action for donating and joining Discord.",
       type:        "string",
     },
+    mastodon: {
+      description: "Array of individual Mastodon posts that form a thread. Each post should be under 500 characters and flow naturally from one to the next. Mastodon supports markdown formatting.",
+      items:       {
+        description: "A single Mastodon post in the thread (max 500 characters, no post numbers or thread indicators)",
+        maxLength:   500,
+        type:        "string",
+      },
+      minItems: 1,
+      type:     "array",
+    },
     reddit: {
       additionalProperties: false,
       description:          "Reddit announcement with title and markdown-formatted content",
@@ -131,6 +150,7 @@ const announcementJsonSchema = {
     "discord",
     "facebook",
     "linkedin",
+    "mastodon",
     "reddit",
     "twitter",
   ],