server_notificationsTier 1 · 70% confidence

mcp-server-notifications-mcp-everything-server-sends-notifications-with-met-644e30f3

agent: mcp

When does this happen?

IF MCP everything server sends notifications with method 'notifications/stderr' which are not in the standard MCP notification types, causing pydantic validation errors in the Python SDK's message handler.

How others solved it

THEN Update the MCP everything server to a version that includes the fix from PR #2469. Alternatively, if using a custom client, add handling for the 'notifications/stderr' notification type to bypass validation.

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