Prepending T3 orchestration instructions to the first user message meant
the message no longer started with "/", so pi never expanded slash
commands (extension commands, prompt templates, skills) on a thread's
first turn. Found live: /t3-demo reached the model as plain text.

The T3 MCP extension now delivers the same instructions through pi's
real system-prompt channel (a before_agent_start hook), and the adapter
sends the user's text untouched.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>