Phoenix PXI Development

Phoenix has a built-in AI assistant named PXI (pronounced "pixie"). PXI is the user-facing name for the assistant feature — backend configuration (env vars, project names) uses generic agents/assistant naming, not "PXI".

The model-facing surface (tool definitions, system-prompt assembly, capability guidance) is server-owned. The browser is responsible for execution and dispatch only. Adding or editing a PXI tool almost always touches both the server and the frontend; this index spans both layers.

Architecture At A Glance

• Server-owned, model-facing:
  • All tool ToolDefinitions sent to the LLM.
  • Capability prompt guidance.
  • System prompt assembly will live here in the next iteration.
• Browser-owned, execution-only:
  • Tool runtime handlers and input parsers.
  • UI state, capabilities snapshot, and per-turn UI context payload.
• Shared contract: tool name is the integration key between server advertisement and browser dispatch.

Resources