Add Claude Call Sidekick trigger

[stephendolan]

Summary

• Adds a new call-recording-started trigger that launches a Claude Code session with a Channels MCP server
• Streams live Whisper transcription and call events into Claude's context
• Claude acts as a silent sidekick — absorbs the conversation and responds only when typed to or addressed by name
• Summarizes key decisions, action items, and dropped threads when recording stops

Files

• call-recording-started — bash trigger that sets up the MCP config and launches Claude Code in a new terminal
• channel.ts — MCP channel server that tails transcriptions.jsonl and events.jsonl
• system-prompt.md — behavioral instructions appended via --append-system-prompt-file
• package.json — declares @modelcontextprotocol/sdk and tsx dependencies (auto-installed on first run)

Prerequisites

• Claude Code v2.1.80+
• Node.js v18+
• Whisper model configured in Tuple
• Requires --dangerously-load-development-channels during the Channels research preview

Test plan

• Start a call with recording enabled
• Verify Ghostty/terminal opens with Claude Code and channel connected
• Speak on the call and confirm transcription events stream into Claude
• Type a question in the terminal and confirm Claude responds using call context
• Stop recording and confirm Claude summarizes the call
• Restart recording and confirm no duplicate Claude Code window opens

🤖 Generated with Claude Code

[github-actions]

Thanks for your contribution, @stephendolan! 🎉

We've done some automated sense checks on your trigger, claude-call-sidekick. All looks great! Someone from Tuple will now manually review your trigger's code and get back to you.