Pratique du Shadowing: Demystifying MCP | Architect Insights - Apprendre l'anglais à l'oral avec la vidéo
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Hi, I'm Scott Reila, Principal Architect Evangelist at Salesforce.
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In this episode of Architect Insights, we're going to be exploring Model Context Protocol, or MCP.
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Often called the USBC for AI, MCP is an open standard revolutionizing how AI agents dynamically connect to external tools and data.
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Today, we will unpack how it works, examine the architectural trade-offs, and discuss why this new protocol complements your standard APIs.
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Let's get started.
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Before we dive in, please note that we may be discussing some forward-looking products and features today.
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Please make all purchasing decisions based on what is currently available.
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There are two types of MCP interactions at Salesforce.
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On the left side, we have Agent Force acting as a client.
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These are Agent Force agents
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that need to connect to other external systems to get access to information like order status or inventory availability, or even to execute tasks based on the conversation.
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On the right side, Salesforce acts as a server.
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In this scenario, we have external or local agents that need to be able to use Salesforce data via Headless 360.
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We'll be touching on both sides in our discussion today.
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But before we go any further, we need to understand exactly what the model context protocol is.
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MCP is the new open standard for connecting AI to outside tools and data.
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It was introduced by Anthropic in November of 2024 to solve major integration bottlenecks.
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Traditionally, if you wanted an agent to interact with a system, you would have to build custom skills or code API or SOC will calls for every single interaction.
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MCP changes this by providing one unified connection standard, eliminating the need for those custom agent specific builds.
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It allows AI models to consistently discover and use external features, and because it is open source, it works seamlessly across all AI providers.
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MCP is often called the USBC for AI.
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Just like you no longer want to carry around separate micro USB and Lightning cables,
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MCP means we finally have a single unified configuration protocol for all of our AI agent integrations.
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Now that we know the what, let's talk about how MCP actually works.
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Let's start with the component view.
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Looking at the left side of the screen, we have our hosts.
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These could be chat interfaces like Claude or ChatGPT, code editors like VS Code or Claude Code or Cursor, or agents like AgentForce.
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Each of these hosts has its own LLM connection and an embedded MCP client.
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You can think of the host and the embedded client as sitting together as one unit for now.
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In the middle, we have the MCP server.
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The server handles the information discovery and setup, illustrating the different tools, resources, and prompts that are available to the host.
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There are three types of interactions the MCP server provides.
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First, we have tools, basically any callable code like APEX, API, whatever.
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Tools are called dynamically by the agent.
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For example, if I ask for an order status, the agent will gravitate towards an order status tool to make that call.
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If there's no appropriate a tool, the LLM will tell me that it can't get the information, or worse, it may actually try to hallucinate the answer.
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Guardrails are very important here.
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Next are resources.
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These represent data or files, and they are fundamentally different from tools because they are not directly callable by the agent.
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To use the resource, the user must specifically mention it in their question, such as asking for a specific order using a manual pointer like at order 123.
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Additionally, resources can handle notifications and follow-up information, which only trigger if the underlying system explicitly tells the MCP server that the resource was updated.
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Lastly, we have prompts.
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These are essentially just prompt templates.
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It is critical to note that there is no LLM interaction on the MCP server side.
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All LLM processing happens over on the host side.
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Now that we know the components, let's discuss initialization.
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Anytime you add a new mcp server
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or start your agent an initialization step occurs exposing an mcp server without security is a bad idea even
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if the data isn't highly sensitive like a weather app for
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instance you absolutely must protect your server from denial of service attacks
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if someone asks an open server for the weather in every
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single us zip code it could easily crash your mcp server the admin or user
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if local pre-configures the api key in the headers of the
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host mcp json config file the host initiates the connection sending a request to the remote mcp server
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while passing those authorization headers the server then validates the key
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and if it is a valid api key the server successfully returns the tool list
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and capabilities for the host to store we'll talk more about storage a little bit later
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if the key is invalid
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or missing the server immediately rejects the call with a 401 unauthorized
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or a 403 forbidden error this step is essential
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because it allows the mcp server to to identify exactly who is making the call, enabling the server to enforce strict rate limiting or resource throttling.
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Now let's talk about user authentication, which is what Salesforce uses for Headless 360.
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This one starts off the same way, where the user or admin configures their host.
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Looking at step one, the initial connection attempt goes from the client host to the remote MCP server.
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However, it returns a 401 unauthorized, which prompts the host to fire up a browser and go to the token URL.
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This takes us to step two where the user logs in through a PKCE or Pixie challenge.
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Once the user authenticates, Salesforce uses the external app to grant your scopes and determine which MCP servers your user can access.
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Moving down to step three, the code is exchanged for a bearer and access token.
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The host connects the user using that bearer token, And as long as the user has the right scopes,
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the server returns the tool list and capabilities that the user is allowed to access.
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As you can see, this is a little bit more involved.
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But this is exactly where we start talking about why it is so important to know who the user is.
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Every user in Salesforce has different permissions and capabilities.
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And in this OAuth flow, it ensures that our agent
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and our chat client can only execute what is specifically available to
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that user and only access the MCP servers that are enabled.
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Now that the MCP is initialized, let's talk about the actual tool invocation.
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Let's say a user asks a question like, what's the humidity level in Chicago?
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Starting on step one of the diagram, the host app sends the user's prompt alongside a list of available tools stored in the host to the LLM.
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This is a critical detail depending on how many MCP servers you have connected.
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The first call can consume a massive amount of your context window
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because every single associated tool is sent to the LLM with the question in context.
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The LLM then evaluates the tool descriptions to decide which one to call.
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Once the tool is selected, like get current weather, we move to step two.
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The host sends the tool call request, including inferred arguments like the Chicago zip code, to the MCP server.
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The server executes the action with the external system and then returns the raw data back to the host.
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Finally, in step three, the host passes the original question alongside that raw tool result back to the LLM.
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The LLM extracts the specific data, like finding the 76% humidity from a large block of data, and generates the final natural language response for the user.
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Notice the token burn happening here.
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We are making multiple LLM calls per interaction, consuming tokens during both the tool selection phase and the final answer generation phase,
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which is why managing your context window is very important.
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Now that we have an idea of what MCP call looks like, let's check out a quick demo.
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I have an MCP server for weather connected right here.
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When I initialize my connection, look at the list of tools that populate.
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We have get current weather, get weather conditions, get current air quality, and so on.
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Notice that there isn't a tool in this list that explicitly mentions humidity levels.
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This means the LLM actually has to go through each of the tool descriptions to understand
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which one is the best fit for our question.
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In this case, it decides get current weather is the best call.
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Now let's look at the contract happening under the covers.
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You can see the tool is looking for a location parameter, like Chicago.
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When we run this, it goes out to the external system and returns an answer, but it doesn't just return a clean 53%.
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Look at this large blob of data right here.
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This is the entire result set that gets passed back to the LLM.
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If I scan through it, I can see the humidity level is 53%, buried right here.
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In order for the LLM to give that simple answer, the LLM has to process this entire raw result set alongside the user's original question and context.
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This is where more token burn happens.
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You are consuming a large amount of tokens based on the
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sizable tool result just to extract one specific data point and generate a final natural language answer.
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For an agent interaction, this is necessary to give the exact answer.
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Is the same level of processing and token burn needed for a system-to-system integration?
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Based on this analysis, we need to understand each use case and determine if MCP or API should be used.
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Let's take a look at a side-by-side comparison of why both exist.
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Looking at the left side, APIs are built for integration.
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They rely on programmatic code and deterministic contracts.
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Because there is no LLM interpreting the request or response, there is zero token cost and the data structure is strict and static.
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Now looking at the right side, MCP is built for interaction.
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It relies on the probabilistic reasoning of an LLM, which as we saw in the demo, consumes tokens to select a tool and generate the final answer.
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However, MCP has dynamic discovery.
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If you add a new tool to your server, the agent knows it exists after the next initialization
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and how to use it without you having to build out custom agent-specific integrations.
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For AgentForce, this is slightly different because the admin has to enable each of the tools for security reasons.
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For system-to-system integrations, APIs remain as the go-to standard due to their deterministic nature and strict processing on the client side.
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However, if natural language processing or additional reasoning is needed, like in an agentic interaction, then MCP would be desirable.
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Ultimately, MCP is a powerful standard that complements your APIs.
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It does not replace them.
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By understanding the strengths and limitations of both, you can build smarter agentic interactions while maintaining the reliability of your system to system integrations.
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Thanks for watching and see you next time.
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Vocabulaire et conseils d’expression pour cette leçon
Cette vidéo contient 128 phrases et 1875 mots à répéter en shadowing. La partie parlée dure 10:19. Le locuteur parle vite, environ 182 mots par minute : attendez-vous à des liaisons et à des sons réduits. Seuls 79 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
15 mots de la vidéo à retenir, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| server nom | /ˈsɝvɚ/ | serveur |
| token nom | /ˈtoʊkən/ | symbole |
| interaction nom | /ˌɪn.təˈɹæk.ʃən/ | interaction |
| integration nom | /ˌɪn.tɪˈɡɹeɪ.ʃən/ | intégration |
| connect verbe | /kəˈnɛkt/ | accoupler, connecter |
| prompt verbe | /pɹɑmpt/ | inciter |
| protocol nom | /ˈpɹoʊtəˌkɑl/ | protocole |
| consume verbe | /kənˈsum/ | consommer |
| humidity nom | /hjuːˈmɪd.ə.ti/ | humidité |
| alongside | /əˌlɔŋˈsaɪd/ | à côté de, le long de |
| custom nom | /ˈkʌstəm/ | coutume |
| resource nom | /ɹɪˈzɔːs/ | ressource |
| enable verbe | /ɪˈneɪ.bəl/ | autoriser, permettre |
| generate verbe | /ˈd͡ʒɛn.ə.ɹeɪt/ | générer |
| capability nom | /ˌkeɪ.pəˈbɪl.ɪ.ti/ | capacité |
Les verbes à particule que vous entendrez
| Mot | Sens |
|---|---|
| check out verbe | mater, regarder |
| go through verbe | traverser |
Prononciation à surveiller
Le locuteur utilise 8 contractions et formes réduites, comme isn't, we'll, can't. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « th »: authorization /ˌɔːθəɹaɪˈzeɪʃən/, authenticate /ɔˈθɛn.tɪ.keɪt/, authentication /ɔːˌθɛntɪˈkeɪʃn̩/, throttle /ˈθɹɔ.tl̩/
- Les sons « sh » et « zh »: interaction /ˌɪn.təˈɹæk.ʃən/, integration /ˌɪn.tɪˈɡɹeɪ.ʃən/, essentially /ɪˈsɛnʃəli/, traditionally /tɹəˈdɪʃ.ə.nə.li/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/
- Mots longs — placez bien l’accent: interaction /ˌɪn.təˈɹæk.ʃən/, integration /ˌɪn.tɪˈɡɹeɪ.ʃən/, humidity /hjuːˈmɪd.ə.ti/, capability /ˌkeɪ.pəˈbɪl.ɪ.ti/, successfully /səkˈsɛs.fə.li/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Commencez à la vitesse 0,75×, répétez phrase par phrase, puis revenez à la vitesse normale quand cela devient facile.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme server, token, interaction.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.