diff --git a/src/mcp/client/streamable_http.py b/src/mcp/client/streamable_http.py
index 9a119c633..6e57317ca 100644
--- a/src/mcp/client/streamable_http.py
+++ b/src/mcp/client/streamable_http.py
@@ -421,9 +421,12 @@ async def _handle_reconnection(
                         await event_source.response.aclose()
                         return
 
-                # Stream ended again without response - reconnect again (reset attempt counter)
+                # Stream ended again without response - reconnect again
                 logger.info("SSE stream disconnected, reconnecting...")
-                await self._handle_reconnection(ctx, reconnect_last_event_id, reconnect_retry_ms, 0)
+                # Reset attempt counter if server made progress (sent new events),
+                # otherwise count as a failed attempt
+                next_attempt = 0 if reconnect_last_event_id != last_event_id else attempt + 1
+                await self._handle_reconnection(ctx, reconnect_last_event_id, reconnect_retry_ms, next_attempt)
         except Exception as e:  # pragma: no cover
             logger.debug(f"Reconnection failed: {e}")
             # Try to reconnect again if we still have an event ID