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New safeguards automatically disconnect MCP servers that produce excessive non-protocol data, preventing unbounded memory growth:
HttpBodyOverflowError: An HTTP SSE transport disconnects when a response body exceeds the size limit without an SSE event boundary. The server is likely returning logs or non-protocol data in the response stream.StdoutOverflowError: A stdio transport disconnects when the server writes too much to stdout without a JSON-RPC message boundary. This catches servers writing debug logs to stdout instead of stderr.
Both errors produce a clear diagnostic message including the size at which disconnection occurred.
Evidence
New error classes (search for "without an SSE event boundary" and "without a JSON-RPC message boundary")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.