Client requested unsupported protocol version: 2025-06-18, so the server will suggest the 2024-11-05 version instead

[myifeng]

Server: Spring Ai: 1.0.3
Client: mcp: 1.13.1

from mcp.client.sse import sse_client

sse_client("http://localhost:8080/sse")

2025-10-20T20:08:05.156+08:00  WARN 1 --- [nio-8080-exec-1] i.m.server.McpAsyncServer                : Client requested unsupported protocol version: 2025-06-18, so the server will suggest the 2024-11-05 version instead

How to supported protocol version: 2025-06-18 ?

[flocorriere]

Do you have spring.ai.mcp.server.protocol property in your application.yml file?
I had the same error and add this:
spring.ai.mcp.server.protocol: stateless
solved it