PraisonAI

PraisonAI is a Python multi-agent framework whose praisonaiagents[mcp] package (installed with pip install "praisonaiagents[mcp]") provides the MCP() client class that connects agents to external MCP servers. The class auto-detects transport from the server address: a bare command string spawns a local stdio subprocess, an http(s):// URL uses Streamable HTTP with auth via custom headers, a ws:// or wss:// URL uses WebSocket with an auth_token parameter, and a URL ending in /sse uses legacy SSE. Since PR #4423 (merged 2026-08-26), the client raises rather than silently continuing when a stdio server times out, errors during initialization, or advertises zero tools. The client is one of three MCP roles documented across the PraisonAI packages, alongside a light server (praisonai-code) and a heavy-host server (praisonai-mcp), each published separately on PyPI.

PraisonAI's transports documentation carries an explicit page-level statement, "Protocol Revision: 2025-11-25", on the client transports page. Because that statement names a specific past revision rather than the current one, spec_status is recorded as legacy with 2025-11-25 as the latest verified revision; the client's own docs separately describe legacy SSE support as tied to "Protocol version 2024-11-05" for that specific transport. No page fetched this session makes an equivalent statement for the praisonai-mcp server package, so this revision claim covers the client role only.