Skip to content
Ghost

Protocol Hub

Ghost is a Universal Protocol Hub — it implements five open standards for AI agent interoperability.

Protocol Stack

Section titled “Protocol Stack”
┌─────────────────────────────────────┐
│  WebMCP — Browser tool contracts    │  Phase 2.5
├─────────────────────────────────────┤
│  A2A — Multi-agent coordination     │  Phase 2
├─────────────────────────────────────┤
│  A2UI — Generative UI (JSON→React)  │  ✅ Complete
├─────────────────────────────────────┤
│  AG-UI — Agent↔User streaming       │  ✅ Complete
├─────────────────────────────────────┤
│  MCP — Model Context Protocol       │  ✅ Complete
└─────────────────────────────────────┘

MCP (Model Context Protocol)

Section titled “MCP (Model Context Protocol)”

Status: ✅ Server + Client complete

Ghost as MCP Server

Section titled “Ghost as MCP Server”

Ghost exposes its tools (search, index, stats) to external AI assistants:

  • Works with Claude Desktop, VS Code Copilot, Cursor, and any MCP client
  • HTTP Streamable transport on port 6774
  • Tool schemas auto-generated via rmcp #[tool] macro

Ghost as MCP Client

Section titled “Ghost as MCP Client”

Ghost connects to 10,000+ external MCP servers:

  • Filesystem, GitHub, databases, APIs
  • Stdio + HTTP transports
  • Configurable from Settings panel

AG-UI (Agent-User Interaction Protocol)

Section titled “AG-UI (Agent-User Interaction Protocol)”

Status: ✅ Complete

CopilotKit’s open standard for real-time agent↔user communication:

  • ~16 event types (TEXT_MESSAGE_START, TOOL_CALL, AGENT_STATE_UPDATE, etc.)
  • Bidirectional streaming via Tauri IPC (desktop) and SSE (external)
  • Human-in-the-loop for dangerous operations
  • Powers all chat streaming in Ghost

A2UI (Generative UI)

Section titled “A2UI (Generative UI)”

Status: ✅ Complete

Google’s declarative UI specification rendered natively in React:

  • 17+ component types: Text, Button, TextField, Card, Row, Column, Chip, etc.
  • Two-way data binding via JSON Pointers (RFC 6901)
  • Adjacency list → tree resolution on frontend
  • Transported via AG-UI CUSTOM events

A2A (Agent-to-Agent)

Section titled “A2A (Agent-to-Agent)”

Status: Phase 2

Google + Linux Foundation standard for multi-agent coordination:

  • Agent Cards at /.well-known/agent.json
  • JSON-RPC 2.0 task delegation
  • SSE for streaming progress
  • Ghost can delegate tasks to specialized agents

WebMCP (Web Agent Protocol)

Section titled “WebMCP (Web Agent Protocol)”

Status: Phase 2.5

W3C incubation for browser-based tool contracts:

  • navigator.modelContext browser API
  • Structured web interactions without scraping
  • Browser extension bridge between Ghost and web tools