Luyện nói tiếng Anh bằng Shadowing qua video: MCP vs API: The protocol every developer needs to know
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If you've ever built an app that talks to an AI model, MCP changes everything.
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Because the way AI connects to your tools, data, and systems is being completely rewritten.
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For years, APIs used to be the glue that held everything together.
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But now there's a new standard rising fast and that something is called the Model Context Protocol or MCP.
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And it might just be the biggest shift since APIs themselves.
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So what exactly is MCP and why are people saying it could replace the way we integrate AI with everything around it?
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Let's break it down clearly so that by the end of this video, you'll understand how MCP actually works and how it's different from APIs
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and why it's reshaping how we build agents and applications that use large language models.
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For decades, API were the universal handshake between systems.
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You define an endpoint, you sent a request, and you got a response back.
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It's clean and predictable.
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And for traditional software, that is perfect.
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But when large language models enter the picture, everything changed.
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Models don't just call one endpoint.
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They might talk to 10 endpoints, they want to chain them together, or even interpret unstructured data.
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and also ask follow -up questions.
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And that means they don't just need access to a tool, they also need context.
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But here's the problem.
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APIs are built for programs talking to programs.
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They are not built for models reasoning over messy, real -world data.
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An API is like a locked cabinet.
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You need to know exactly what drawer to open
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and what shape the key is but a model is trying to understand what's inside the cabinet without clear labels.
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So it doesn't know which function to call or which parameters to pass until you tell it.
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And you have to hard code it sometimes and oftentimes you have to keep explaining over and over again.
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That's where MCP comes in.
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It was designed to make models autonomously discover
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and use tools without the constant hand -holding that we've been doing in prompt engineering.
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So before we dive deeper, let's define both sides clearly.
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APIs are the traditional way software communicates.
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They expose specific endpoints, they accept requests in structured formats like JSON, and they return predictable outputs.
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Developers document them, secure them, and version them.
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But they assume one thing that both sides knows exactly what to expect.
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MCP flips that assumption.
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Instead of the model needing to be manually thought about each endpoint,
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MCP gives the model a standardized way to discover what a tool can do, what kind of inputs it expects,
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and what kind of outputs it returns.
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all through context.
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Think of it like giving a model a live machine -readable map of your API instead of a static instruction manual.
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Now that sounds abstract, so let's make it real.
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Imagine you're building an AI agent that manages support tickets.
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You give it access to Gmail, Notion, and Jira.
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With APIs, you'd write custom code for each integration, handle issues like pagination, auth tokens,
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error cases, rate limits, and also teach the model through long prompts, like, when you want to create a Gira ticket,
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call this endpoint with these fields.
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When you want to reply to an email, call Gmail with this payload.
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But with MCP, you don't need to do any of that.
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Each service like Gmail, Notion, Jira, exposes an MCP compatible interface.
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The model discovers these tools automatically and understands their functions as part of its environment.
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You don't tell it how to do it, you give it the context and it figures it out dynamically.
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That's the core difference between APIs, which are code level contracts between two applications,
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and MCP, which is a semantic protocol between a model and its environment.
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So you're no longer teaching the model which endpoint to hit,
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but you're giving it a structured description of what's available and letting it reason about which tool to use and when.
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It's like giving the model a toolbox instead of forcing it to memorize how each tool works.
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This shift might sound small, but it's actually massive for developers building agentic systems.
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With APIs, the logic of what to call and when to call it lived in your app code.
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With MCP, that logic can actually move into the model's reasoning layer itself.
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You can now build a general purpose agent that can plug into any tool that supports the protocol.
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without having to rewrite code for each integration.
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That's the magic here and its standardization, the same way HTTP made websites interoperable.
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Allowing them to share and use data with each other
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and other systems and letting them work together to perform tasks with minimal human intervention.
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MCP is trying to make AI environments interoperable.
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But let's talk about what's actually happening under the hood.
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An MCP server is a lightweight process that sits next to your service or data source.
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It describes what it can do and what functions it exposes all using JSON schemas.
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The model connects to this server through a standardized interface like WebSocket,
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or HTTP and receives metadata about the available resources.
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Once connected, the model can call these functions directly, not by guessing, but by using the metadata.
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It knows what inputs are required and what each field means and what type of output to expect.
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The beauty is that everything is self -describing.
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You don't have to prompt engineer the schema or reformat responses.
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It's all standardized.
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Compare that to an API where every single integration is bespoke.
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You need a developer to read the docs, map the payloads, and manually wrap the endpoints.
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So MCP abstracts that away.
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This means instead of building 100 custom integrations, you build one MCP interface and every compatible model can use it instantly.
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That's why people are calling MCP the plug and play layer for AI systems.
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Now, this doesn't mean APIs are going away.
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APIs are still the foundation.
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They're how your systems actually function.
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But MCP changes how models access those APIs.
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Think of it like this.
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MCP doesn't replace your backend.
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It replaces the middleware between the model and the API.
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The MCP server acts like a translator, converting your existing APIs into a format that models can understand automatically.
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So instead of saying MCP versus API, it's more like MCP on top of APIs.
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This distinction is key.
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MCP doesn't compete with APIs.
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It actually leverages them.
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But it changes who the client is.
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With API, the client is another program or user.
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With MCP, the client is the model itself.
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And that subtle difference changes everything about how we design integrations.
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Let's zoom out for a bit.
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The rise of MCP is part of a bigger movement towards model -native software architecture.
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For decades, we've built systems for humans and for code.
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Now we're building systems for models.
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And models don't consume REST endpoints the way code does.
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They consume context, which includes structure descriptions, schemas, and examples.
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They do this so that they can reason, plan and act.
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So MCP gives them that in a standardized way.
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That's why developers building agent frameworks are moving in this direction.
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They're realizing that connecting a model to a world of tools isn't about a bigger context window, it's about cleaner protocols.
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And let's be honest, it's not all magic.
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MCP is still pretty new.
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The biggest challenge right now is adoption.
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For MCP to truly work, the ecosystem needs servers, clients, and tools to agree on the same standard.
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Another huge challenge is security and control.
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When models can directly call tools through a protocol, you need clear permission layers.
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You don't want a model accidentally sending an email, deleting a file, or making a huge database change that it wasn't supposed to.
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APIs handle that through authentication, keys, and rate limits.
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MCP needs to bring those guardrails into its protocol layer, which is already happening.
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The spec defines capabilities, scopes, and authentication methods that keep things safe but it's still early days.
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And the final challenge is the developer mindset.
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Most of us grew up in an API world.
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We think in terms of endpoints and routes.
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MCP asks us to think in terms of capabilities and context, to design systems that describe what they can do, not just how to do it.
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That's a huge paradigm shift, but it's worth learning early.
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Here's where it all comes together.
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Think about the moment when HTTP unified the internet.
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Before that, every service had its own protocol, from FTP, Gopher, Telnet, which are all different internet protocols.
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Once the web standardized on HTTP, suddenly everything became interoperable.
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MCP is doing the same thing for AI agents.
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Instead of each company inventing its own plugin format or integration layer,
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MCP provides a single open protocol that any model can understand.
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You build your ConnectShare once and any compliant model can use it.
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That means the future of AI tools will look less like custom integrations and more like a shared ecosystem.
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You will have an MCP server for your product, and any AI like Gemini, Claude, GPT can use it instantly.
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That's the world we're heading towards.
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One where models, not just humans, become first -class users of software.
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So to sum it all up, APIs are not dead.
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They are just evolving.
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APIs were made for deterministic systems one program asking another for data.
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And MCP is made for probabilistic systems, a model reasoning about what it can do.
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So the next time someone says MCP versus API, Just remember, it's not a direct comparison.
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It's a foundation being rebuilt.
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MCP sits one layer above APIs and turning them from static routes into living interfaces that models can actually reason about.
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And as more frameworks adopt it, you'll start seeing a new pattern emerge.
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Instead of hard -coded integrations, we'll build model -aware systems where context tools and reasoning can all live in harmony.
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I hope this video was helpful in explaining the differences between MCPs and APIs.
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To learn more about the model context protocol at a deeper level, check out this next video.
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- “API” - Nên phát âm rõ ràng từng chữ cái (A-P-I) để người nghe dễ nhận diện.
- “Models” - Từ này có nguyên âm "o" dài, cần chú ý không làm ngắn âm.
- “Context” - Âm cuối "text" có thể bị bỏ qua trong giao tiếp nhanh, hãy đảm bảo phát âm đầy đủ để người nghe hiểu rõ ý nghĩa.
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