add minor comment on where this does not run

Signed-off-by: David Korczynski <david@adalogics.com>

Author: DavidKorczynski

infra/experimental/mcp/README.md

@@ -16,6 +16,8 @@ this means you must run this in a heavily sandboxed environment, and from a
 security perspective if you run this tool you will run untrusted code on
 your environment.
 
+This code does not run in OSS-Fuzz production services and is not part of the
+tooling that runs our continuous fuzzing of open source projects.
 
 ## Running the Service