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Streamable HTTP answers a POST on the same request; classic SSE splits the channels, so a GET opens the response stream and that stream announces a second URL as the request channel. The adapter only ever spoke the former, which is what reverted the Baserow migration twice. A contract now selects the transport and defaults to streamable_http, so no existing provider changes, and an unknown value is refused at load rather than at the first tool call. The stream is opened once and held, because reopening it per call would lose whatever answer is already in flight. A notification carries no id, so it posts without awaiting a response the protocol never sends. A dead stream is now reset alongside the session it belongs to, since rebuilding the handshake over a dead stream would keep using it. Two things this cleaned up on the way: NoRedirect and OPENER had been copied rather than reused, so server.py now takes the one in sse.py, and decode_jsonrpc moved to passthrough.py where it belongs, since it unwraps MCP responses rather than HTTP, which also brought server.py back under the file-size limit. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>