WEBVTT 00:00.320 --> 00:00.840 Cool. 00:00.840 --> 00:06.680 So before we write our MCP clients, we want to first write our MCP servers. 00:06.680 --> 00:09.320 So we'll be able to connect them to our clients. 00:09.320 --> 00:12.760 And we're going to write two very simple MCP servers. 00:13.000 --> 00:19.720 One is going to expose mathematic tools to add numbers and multiply them, which is going to communicate 00:19.720 --> 00:21.000 via Stdio. 00:21.320 --> 00:28.400 And the other server is going to be a very dumbed down weather server, which is simply going to output 00:28.400 --> 00:28.640 that. 00:28.640 --> 00:29.960 It's very hot outside. 00:30.120 --> 00:36.880 But the interesting fact about this server is that it's going to communicate via SSH server sent events. 00:36.880 --> 00:40.000 And this is the first time we introduce how to do that. 00:40.000 --> 00:41.720 And I'll give you a very quick spoiler. 00:41.720 --> 00:43.040 It's going to be very easy. 00:43.760 --> 00:44.360 All righty. 00:44.360 --> 00:46.880 So let's go and create a new package. 00:46.880 --> 00:49.200 And I'm going to call it servers. 00:49.200 --> 00:50.960 So this is now a new directory. 00:50.960 --> 00:56.800 And let's make it a package by creating an empty underscore init.py file. 00:57.000 --> 00:59.480 So this is now our servers package here. 00:59.680 --> 01:05.240 And now I want to create a new file which I'm going to call math server dot Pi. 01:05.680 --> 01:11.840 And here we're going to have the implementation of an SMTP server, which exposes two tools, one to 01:11.880 --> 01:15.920 add numbers and the other tool to multiply those numbers. 01:15.920 --> 01:23.640 And by the way, when making this course, I started by naming this file math.pi and eventually what 01:23.640 --> 01:24.080 happened? 01:24.080 --> 01:30.840 It turns out that it collided with the built in math package in Python, and it really took me some 01:30.840 --> 01:32.040 time to figure it out. 01:32.040 --> 01:37.680 And once I gave up, I simply dumped my error to cursor and it was able to point that out. 01:37.920 --> 01:44.880 So the TLDR here called this file math server.py, because this is a very simple amqp server, and we've 01:44.880 --> 01:47.120 already done how to do very similar things. 01:47.160 --> 01:54.320 I'm simply going to copy paste it from the LinkedIn adapters repository, and we can skim this implementation 01:54.320 --> 01:54.600 here. 01:54.600 --> 01:56.640 And this is a very simple implementation. 01:56.640 --> 02:00.680 But what's important to note is this transport layer which is stdio. 02:01.320 --> 02:02.000 All right. 02:02.000 --> 02:05.320 So let me copy that and let's go to cursor and paste it. 02:05.560 --> 02:08.600 And let's try to run it now in our terminal. 02:10.120 --> 02:15.000 And I'm going to do it by running UV run server math server dot pi. 02:15.400 --> 02:20.050 We can see that it is running successfully with this blinking square over here. 02:23.090 --> 02:23.570 All right. 02:23.570 --> 02:28.490 So let's now create the second server which is going to be a server which outputs the weather. 02:28.490 --> 02:31.570 But it's going to be a very damped version of the server. 02:31.570 --> 02:34.810 And it's always going to output that it's hot as hell. 02:34.970 --> 02:37.650 So maybe it's going to be relevant only for Dubai. 02:37.890 --> 02:39.530 And here's a clip from me in Dubai. 02:39.930 --> 02:44.290 But the cool thing about this server, and this is the first time I was covering it, it's going to 02:44.290 --> 02:48.650 be a server which the transport is going to be via SSH. 02:48.850 --> 02:52.570 So it's going to be a server sent event MCP server. 02:52.570 --> 02:58.010 And this means that the communication between the client and the server, it's not going to happen via 02:58.050 --> 02:58.890 Stdio. 02:59.050 --> 03:01.210 It's going to happen via HTTP. 03:01.450 --> 03:05.450 And the client is going to make http post request to the server. 03:05.450 --> 03:08.970 And of course we don't really need to handle this communication over here. 03:08.970 --> 03:12.570 We get this out of the box when we use the MCP SDK. 03:13.410 --> 03:18.170 Just need to specify to the server that we want that the transport to be SSH. 03:18.410 --> 03:19.570 And this is super easy. 03:19.610 --> 03:22.610 It's just a flag that we pass when we run the server. 03:23.050 --> 03:23.810 Alrighty. 03:23.850 --> 03:26.850 So we're back in cursor and we want to create a new file. 03:26.850 --> 03:31.130 And let's call this file weather underscore server dot p y. 03:31.930 --> 03:35.410 And it's going to hold the implementation of our weather and CP. 03:35.730 --> 03:39.530 And let's go back to the link chain MCP open source. 03:39.730 --> 03:42.330 And let me copy this dummy server they have here. 03:42.610 --> 03:44.010 And I'm going to copy it. 03:44.010 --> 03:50.850 And we can see it's a very simple implementation of a server which exposes the Get weather tool. 03:51.050 --> 03:54.330 And it's going to return always the same static string. 03:54.730 --> 03:57.770 So just for the fun, let's go and change the string. 03:57.770 --> 04:01.810 And let's say that it is always hot as hell. 04:03.930 --> 04:04.810 Sorry about that. 04:04.810 --> 04:07.810 Let me just correct it to hot as hell. 04:08.010 --> 04:08.570 All right. 04:08.570 --> 04:11.210 So now we are done with the server. 04:11.210 --> 04:16.450 And the important thing to notice is that transport here the transport here is SSE. 04:16.930 --> 04:20.010 So this is how we communicate with this MCP server. 04:20.170 --> 04:22.690 And let me show you how it's different when we run it. 04:22.890 --> 04:30.330 If we go now and create a new terminal instance let me split here this view and let me run our UV run 04:30.330 --> 04:34.380 and then weather sorry servers weather server server.py. 04:35.660 --> 04:40.460 We can see now that the server is actually running in localhost port 8000. 04:40.900 --> 04:45.460 If we want to change the ports to run on a different port, we can totally do that. 04:45.460 --> 04:49.580 We simply need to specify and tell via the MCP SDK. 04:50.220 --> 04:53.460 And that's pretty much it for this video. 04:53.580 --> 05:01.220 So we created two simple web servers, one running in SDL and the other the transport is via SSH. 05:01.660 --> 05:04.780 So let's go and let's commit this code over here. 05:05.940 --> 05:09.580 So let me go now and see which files changed. 05:09.860 --> 05:11.660 Only the servers directory. 05:11.660 --> 05:12.780 And I added it. 05:13.100 --> 05:16.300 And let's go and use cursor to commit this code here. 05:17.100 --> 05:20.100 So cursor is going to auto generate the commit message. 05:21.540 --> 05:26.180 Let me commit that and let's push it to the repository. 05:27.740 --> 05:36.300 And if we go back now to the repository then we can see right now we have the new directory here. 05:36.300 --> 05:38.140 And we can see we have now two commits. 05:38.140 --> 05:41.860 We have the first commit from the previous video and this commit from this video.