This is too dense. You might as well just post some Python code with sufficient comments to get the same point across. I think a nicely written article with a few diagrams would go a long way. Sometimes less is more.
MCPs don't really need this level of technical explanations (it's basically just a REST API with standardized endpoints for discovery aimed at agents), and AI agents really do lack in the taste dimension when it comes to these things.
The opening has 1 paragraph and 5 table entries. One of them is “Not REST”
It’s a little scary that this was considered too dense or complex because the basics were explained in something that could be read in 1 minute. That still wasn’t enough to stop the top HN comment (as I write this) from calling it too dense and giving incorrect information that is immediately refuted by skimming the top part of the article.
It is not technically REST, but it is basically REST. The alternative to a server endpoint is JSON-RPC over stdin which has the same request/response format as REST. This is exactly the point about over-complicating it by saying "it's not REST, it's not JSON-RPC". It's a JSON request/response protocol with a defined format.
The opening is fine, but when you click "Start the lessons" you get a six-pane interface that imho is pretty overwhelming
Yeah, I can click around and follow what's going on. But I'm with GP: this is not making it easier to understand. It's great at being Hollywood UX: looks pretty, stuff moving everywhere. One click on "step" makes the image animate, and change the text in the left sidebar, top middle, and right sidebar, in addition to stepping the table in the bottom middle. But it's almost the opposite of distilling information
Sign of times man. Not that long ago -- on HN mind you -- someone posted an article that landed on main page that used lsblk as some sort of secret hacker linux command.
While we’re applauding brevity, three cheers for the first line being “model context protocol”. While yes, this one is common, it’s still nice not having to scroll through 20 screens of blah to still not find out what the thing is.
Yeah, this feels like one of those ‘explainers’ that feel like they are great to someone who already knows how the system works, but don’t actually work for newbies because they tacitly assume knowledge of the shape of the system that seems ‘obvious’ to someone steeped in it.
This is a problem with most docs I encounter. _Good_ documentation should also teach the user how to use the thing, not simply end up as glorified out-of-band code comments.
I found that it's a mistake I would often make when writing documentation about something I deeply understand. I forget the questions that led me to that understanding. Now I make a conscious effort to think about the knowledge of the intended audience. I still miss things, but that's why it's good to have other people review.
Are MCP calls composable in e.g. codex yet? e.g. can a model pipe a jira MCP call to grep or sed, or at least into a file? Last I looked at MCP it was just a vastly worse version of curl, .netrc, and some short text files describing calls (which are themselves greppable). Is there anything useful beyond that that I'm missing?
Last I checked it still doesn't. A skill that tells your client to call a CLI, and uses the help menus for progressive disclosure, benchmarks better. Developers noticed this immediately and there is sort of an anti-MCP sentiment. The protocol was probably largely conceived for non-coding agents run by non-coders.
In theory the agents could just natively know how to do this better, to get exactly the composability you want. In fact, you could probably just write a CLI mcp-caller and tell the agent to only call MCPs via that, and boom you're done.
Where MCP does come back into the picture even for coders is a more controlled way to break a sandbox.
What I will also say is it matters less and less. It's the usual bitter lesson. The models are just getting so much better all attempts to optimize everything are a drop in the bucket.
Yes, they are. Look into CodeMode (available in both Opencode and Pi). The agent has access to a code execution tool that can call and compose other tools/MCPs by writing code.
Yeah, the new Pi harness has codemode and I imagine there's many more.
Internally at my startup, I built an interpreter for a subset of Javascript where the agent can compose its tools and MCPs. The cool thing about it is that it can create durable workflows and automations from these same scripts.
I couldn't find a github link, if anyone knows where to find the code for this, I'd like to modify it to make it a primer more friendly to non-technical managers.
Literally just give the link to Claude/GPT/etc. and it'll be able to replicate it easily. Hell, just loosely describe this as a text prompt and they'll probably nail it one shot. This is basically the "default" interactive explainer one-pager that all of these models generate.
I feel like I'm living in a different world than other people with my MCP experiences.
At my job we maintain an MCP for our admin portal/prod data and it's seen a lot of use. Our admin side was a mess to use so allowing admins to ask questions about prod data has been a huge help for everyone.
And for myself personally, connecting MCPs to Claude has also been an insanely huge productivity boost. It's really nice to just ask for a link to Datadog when I want to monitor some change I made, instead of trying to craft a query myself.
The lightly technical people I talk to have no problems getting it done.
Their secret, which is not very secret, is to ask the AI to help them set it up.
I think this might follow that bell curve meme where people on the unsophisticated and highly sophisticated ends of the curve are leveraging the LLM for MCP setup (and other routine tasks) while some in the middle are making it more complicated than it needs to be because they still think of it as outside the domain of AI-assisted work.
The biggest problem I see isn’t getting MCP set up, it’s people getting stuck using the wrong tools for the job. I’ve improved a lot of workflows by observing what someone is doing and suggesting a better tool for the job.
> Don't believe me? Try connecting Blender to Codex.
Is it that bad? I have Blender connected to Claude (and my mind is quite blown by how great it is to use) and it was quite easy if you could follow the tutorial (the hardest part was reading that you have to click on something twice)
You might be right. I created a quick and dirty MCP server to expose my existing REST API calls. It doesn't work as well as I hoped. The AI client seems to have trouble determining the mix of MCP tools needed to fulfill a user's prompt, unless a specific tool is defined for that request. Maybe I am missing something.
Multiple non-developer colleagues at my workplace are trying out all kinds of MCP connectors in their Claude instances. Maybe when MCP was mostly relegated to coding harnesses it was more of a developer's tool but things have changed a lot.
Also, Apple just announced their preview for new Siri AI capabilities and part of that is they seemingly are going to add MCP to apps (if developers of the apps want to) as tools, which would enable Siri to use functions of apps, similarly to Claude Desktop using functions of services through MCP tool calls.
> The real "race to market" winners will just throw the credentials into the SQL connector and let 'er rip like a real man.
That's what we started doing... and never looked back. Now we're thinking of exposing parts of the database in readonly mode to in-house staff (non-developers) so they can vibe code whatever the hell kind of tools they want...
I agree - MCP just standardizes APIs to make it easier for LLM clients to consume them. Imagine if we had to use standard APIs - it would be more difficult to enable any single one. That’s why the labs instituted MCP.
It's almost 2027 and I still dont understand if we actually need MCP. I must admit I am not really surfing the AI wave. But looks like a nothing burger.
MCP is that kind of thing a manager comes up to you with and says "ARE WE USING MCP? it's the latest thing" and you roll your eyes, hunch over, stare at your screen and say to yourself "no, we're using strings, just strings." as you watch them drift to their next prey, you see scrawled up in their hands a note with crossed out acronyms. NFT. Web3. AMP. SOAP. IoT.
The manager is asking because marketing and sales are asking. They want to put a bullet-point on the feature list of the brochure. The best play is to build a compliance feature that's firewalled into a corner where it can't hurt anything. The product technically includes MCP, NFT, et al.
For coding agents I agree with you, but people are building for more than just developers now. The idea that a user facing service would give their agents shell access is kind of horrifying, as you then make it possible for prompt injection to mean a system take over.
MCP has its place. It should not be the default for many use cases, but if you need to expose specific tools in a secure way to agents that are not trusted to run shell commands then MCP is great. Developers need to think beyond their own use cases and consider architecture patterns if they're going to build, not just consume, AI systems.
Completely agree, MCP is going to be a continuing topic for providing capabilities to LLMs for non-technical users. If you're in a tightly regulated enterprise environment asking your IT admin to enable CompanyX's MCP Connector in Claude is much more palatable than asking for a CLI tool to be installed as well.
It's about where the agent runs more than the users - hooking e.g. Datadog's Bits AI up with access to relevant repos in my company's GitHub org to find out what's driving the metrics its looking at likely wouldn't be a thing if not for GitHub's MCP server and OAuth, I doubt whoever admins that would bother if Datadog had to set up some completely custom thing.
100% agree. I've been building MCPs that enable Claude (my agent of choice to have voice conversations with). These hook into my home maintenance system (https://homemaintlist.com) and workout tracking system (https://tallyup.codewalkers.net) plus several private mcp servers I've made to expose Claude to specific services. These all allow me to just have conversations with Claude and have all these very specific things available and take action on them.
Excellent points. We still need to employ good cybersecurity principles when granting AI access to tools and resources. Let’s not throw out everything learned in the last three decades. Keep the access narrow in scope and targeted.
I agree. MCPs have the massive problem of not being composable, which is a big strength of shells/CLIs allow.
People make the argument that it doesn't matter for non-programmers. I use Bluebeam (a pdf editor which is standard in the construction industry) daily, and it has an MCP, but a big problem is that if the agent wants to import or export a large amount of data from a document, then it has to regurgitate a bunch of tokens into or out of the MCP. If it were a CLI, then it would just pipe things in and out as it needs.
I ended up just having the agent make a script that wraps the MCP so it can use it as a CLI instead.
As a trivial counterpoint, streaming outputs and proper signaling support is required for being able to compose efficiently under any setup/harness. The more layers of abstractions you add, the more likely it is your MCP server didn't support the usecase that some later agent came up with and so you can't stop your stream when you find your top 3 hits. If you don't even own the server, you can't even modify the source and restart it to fix it.
There are usecases of MCPs (e.g. serving outside customers via proprietary tools), but composability has not been in the minds of the early users of MCP and it is one of the hundreds of little practical drawbacks they have when used in house.
It just removes the need to install a cli tool on your local machine. I in general are sceptical before I install some external 3rd party software. With MCP over HTTP transport, the MCP might still talk to your agent and tell the agent to do XYZ, but your agent can still treat that command as malicious and refuse to execute. While not perfect, it is just another layer of security.
It is the same with a wepapp: You could argue you don't neex browser apps if the user just install a software on their computer, but we feel better using the sandboxing environment of your browser.
Depending on use case, would start with just solid HTTP APIs, then a simple CLI to consume them, then add MCP using the new spec. Build slowly only adding new access protocols as needed.
Be surprised how far apps can get with just solid & well documented APIs. Modern agents are smart!
Too dense. I’m not sure how this was outlined to the LLM but please first educate yourself on the basic principles of teaching, learning, and education. The AI that made this went off the rails and it is borderline incomprehensible.
I've been thinking alot about developer education and while I think this format is fun to fiddle with, I feel this(and a lot of technical learning resources) are no longer as valuable as they would have been in a world without LLMS. Now if I wanna learn something I ask claude and I can essentially build my knowledge incrementally, have it build animations iteratively, ask questions and essentially derive an understanding.
This is noisy slop that doesn't explain anything. Maybe try starting with a definition and a single diagram?
I swear when I see stuff like this is makes me depressed about the future of our industry. Pick up an Edward Tufte book or something and use your brain
Yep. This is what we get when people that didn't study UX and product development have access to AI. They have good ideas, ask AI to generate it and can't see that the result is unbearable.
MCPs don't really need this level of technical explanations (it's basically just a REST API with standardized endpoints for discovery aimed at agents), and AI agents really do lack in the taste dimension when it comes to these things.
The opening has 1 paragraph and 5 table entries. One of them is “Not REST”
It’s a little scary that this was considered too dense or complex because the basics were explained in something that could be read in 1 minute. That still wasn’t enough to stop the top HN comment (as I write this) from calling it too dense and giving incorrect information that is immediately refuted by skimming the top part of the article.
Yeah, I can click around and follow what's going on. But I'm with GP: this is not making it easier to understand. It's great at being Hollywood UX: looks pretty, stuff moving everywhere. One click on "step" makes the image animate, and change the text in the left sidebar, top middle, and right sidebar, in addition to stepping the table in the bottom middle. But it's almost the opposite of distilling information
If the article said, "It's basically just REST". There'd be no need to comment as such.
They both provide stateless RPC methods and human readable metadata that makes them easy to route.
You could ask why json-rpc was even necessary for 2.0. I think mostly just for stdio and backwards compatibility.
Maybe it was written for an AI? :)
Or by an AI? Or both?
From your comment, I expected to be annoyed by a bunch of slop or obscurities.
My guess is the writing did not come straight out of an LLM and was carefully curated.
If I’m wrong I’d love to have the style prompt.
In theory the agents could just natively know how to do this better, to get exactly the composability you want. In fact, you could probably just write a CLI mcp-caller and tell the agent to only call MCPs via that, and boom you're done.
Where MCP does come back into the picture even for coders is a more controlled way to break a sandbox.
What I will also say is it matters less and less. It's the usual bitter lesson. The models are just getting so much better all attempts to optimize everything are a drop in the bucket.
Internally at my startup, I built an interpreter for a subset of Javascript where the agent can compose its tools and MCPs. The cool thing about it is that it can create durable workflows and automations from these same scripts.
"Find the latest prod JIRAs and analyze the related logs"
Don't believe me? Try connecting Blender to Codex.
At my job we maintain an MCP for our admin portal/prod data and it's seen a lot of use. Our admin side was a mess to use so allowing admins to ask questions about prod data has been a huge help for everyone.
And for myself personally, connecting MCPs to Claude has also been an insanely huge productivity boost. It's really nice to just ask for a link to Datadog when I want to monitor some change I made, instead of trying to craft a query myself.
Their secret, which is not very secret, is to ask the AI to help them set it up.
I think this might follow that bell curve meme where people on the unsophisticated and highly sophisticated ends of the curve are leveraging the LLM for MCP setup (and other routine tasks) while some in the middle are making it more complicated than it needs to be because they still think of it as outside the domain of AI-assisted work.
The biggest problem I see isn’t getting MCP set up, it’s people getting stuck using the wrong tools for the job. I’ve improved a lot of workflows by observing what someone is doing and suggesting a better tool for the job.
Is it that bad? I have Blender connected to Claude (and my mind is quite blown by how great it is to use) and it was quite easy if you could follow the tutorial (the hardest part was reading that you have to click on something twice)
Also, Apple just announced their preview for new Siri AI capabilities and part of that is they seemingly are going to add MCP to apps (if developers of the apps want to) as tools, which would enable Siri to use functions of apps, similarly to Claude Desktop using functions of services through MCP tool calls.
Just like us to take something and limit it back to being useless until we implement the feature (tools).
The real "race to market" winners will just throw the credentials into the SQL connector and let 'er rip like a real man.
That's what we started doing... and never looked back. Now we're thinking of exposing parts of the database in readonly mode to in-house staff (non-developers) so they can vibe code whatever the hell kind of tools they want...
No it doesn't. It adds yet another Nth "API standardization" spec.
MCP has its place. It should not be the default for many use cases, but if you need to expose specific tools in a secure way to agents that are not trusted to run shell commands then MCP is great. Developers need to think beyond their own use cases and consider architecture patterns if they're going to build, not just consume, AI systems.
This was just to avoid MCP infra, but the newer stateless protocol makes that much more trivial.
People make the argument that it doesn't matter for non-programmers. I use Bluebeam (a pdf editor which is standard in the construction industry) daily, and it has an MCP, but a big problem is that if the agent wants to import or export a large amount of data from a document, then it has to regurgitate a bunch of tokens into or out of the MCP. If it were a CLI, then it would just pipe things in and out as it needs.
I ended up just having the agent make a script that wraps the MCP so it can use it as a CLI instead.
Tool calls being composable or not are a property of the harness being used, not of MCP servers
There are usecases of MCPs (e.g. serving outside customers via proprietary tools), but composability has not been in the minds of the early users of MCP and it is one of the hundreds of little practical drawbacks they have when used in house.
It is the same with a wepapp: You could argue you don't neex browser apps if the user just install a software on their computer, but we feel better using the sandboxing environment of your browser.
Be surprised how far apps can get with just solid & well documented APIs. Modern agents are smart!
Then you don't need an MCP server per service anymore, you just need one and a whitelist of authorized services.
I swear when I see stuff like this is makes me depressed about the future of our industry. Pick up an Edward Tufte book or something and use your brain
from mcp.server.fastmcp import FastMCP
“Claude add an mcp for this”