feat(welcome): progressive discovery onboarding

Welcome skill now uses drip-feed approach instead of listing all
capabilities upfront. Agent asks user to explore or jump into building.
Init script delegates to /welcome skill instead of hardcoded prompt.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

container/skills/welcome/SKILL.md

@@ -9,17 +9,20 @@ You've just been connected to a new messaging channel. Introduce yourself to the
 
 ## What to do
 
-1. Send a short, friendly greeting using `send_message`
+1. Send a short, warm greeting using `send_message`
 2. Mention your name (from your CLAUDE.md)
-3. Briefly describe 2-3 things you can help with based on your configured skills and tools
-4. Keep it to 2-4 sentences — don't overwhelm
+3. Make it clear you can do a lot — but do NOT list your tools or skills upfront. Keep it open-ended and intriguing
+4. End by asking: would they like to explore what you can do, or jump straight into building/creating something?
+
+**If they want to explore:** show one skill or capability at a time. Briefly explain what it does, offer to demo it or let them try it, then ask if they want to see the next one or move on. Drip-feed — never dump a list.
+
+**If they want to jump in:** just go. Help them with whatever they ask.
 
 ## Tone
 
-Warm but concise. This is a first impression — be helpful, not verbose. Match the channel's vibe (casual for Telegram/Discord, slightly more professional for Slack/Teams/email).
+Warm, confident, and inviting. Make the user feel like they just unlocked something powerful. Match the channel's vibe (casual for Telegram/Discord, slightly more professional for Slack/Teams/email).
 
-## Example
+## Important
 
-> Hey! I'm Andy, your assistant. I can help with coding tasks, answer questions, manage scheduled reminders, and work with files. Just send me a message anytime.
-
-Adapt based on your actual name and capabilities. Don't list every tool — pick the most useful ones.
+- Scan your available MCP tools and skills so you know what you have — but keep that knowledge in your back pocket. Reveal capabilities naturally, one at a time, only when relevant or when the user asks to explore.
+- Never overwhelm with a full list. Discovery should feel like unwrapping, not reading a manual.

scripts/init-first-agent.ts

@@ -50,9 +50,7 @@ interface Args {
 }
 
 const DEFAULT_WELCOME =
-  'System instruction: please send a short, friendly welcome message to the user. ' +
-  'Introduce yourself as their NanoClaw agent, confirm the channel is working, and invite them to chat. ' +
-  'Keep it under three sentences.';
+  'System instruction: run /welcome to introduce yourself to the user on this new channel.';
 
 function parseArgs(argv: string[]): Args {
   const out: Partial<Args> = {};