Update README.md

pcarleton · web-flow · commit 90ab89ffe195 · 2025-11-03T14:28:36.000Z
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 A framework for testing MCP (Model Context Protocol) client implementations against the specification.
 
+> [!WARNING]
+> This repository is a work in progress and is unstable. Join the conversation in the #conformance-testing-wg in the MCP Contributors discord.
+
 ## Quick Start
 
 ```bash
