--- title: What is MCP? MCP Explained Simply | daily.dev description: Model Context Protocol (MCP) is explained as a standardized communication layer between LLM applications and the tools/data sources they need to use... canonical: https://daily.dev/posts/what-is-mcp-mcp-explained-simply-95uo2v6ar twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: What is MCP? MCP Explained Simply | daily.dev og:description: Model Context Protocol (MCP) is explained as a standardized communication layer between LLM applications and the tools/data sources they need to use... og:url: https://daily.dev/posts/what-is-mcp-mcp-explained-simply-95uo2v6ar og:image: https://api.daily.dev/og/posts/95UO2v6Ar.png og:image:alt: What is MCP? MCP Explained Simply og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # What is MCP? MCP Explained Simply **[TechWorld with Nana](https://daily.dev/sources/techworldwithnana)** · 30 min read · 2 upvotes · 0 comments ## Summary Model Context Protocol (MCP) is explained as a standardized communication layer between LLM applications and the tools/data sources they need to use (databases, Stripe, Slack, Kubernetes, etc.), replacing the need for custom integration code per AI model and tool combination. The explanation covers why raw HTTP APIs are poorly suited for LLMs (verbose, human-oriented responses), and how MCP addresses this through response translation, dynamic tool discovery, stateful sessions across multi-step conversations, and centralized credential management so LLMs never see API keys directly. It also breaks down the three-component MCP architecture (host, MCP client, MCP server), the types of MCP servers available (community/open-source, enterprise/vendor-built, and third-party community servers), and when to build a single aggregator server versus many. The video is sponsored by Tailscale, which is presented as a complementary network security layer for MCP server deployments. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is the Model Context Protocol (MCP) and why was it created? MCP is a standardized communication protocol that connects LLM-powered applications to external tools and data sources, replacing the custom integration code developers would otherwise write for every combination of AI model and tool. It was created because connecting multiple LLMs (like Claude, GPT-4, Gemini) to multiple data sources (databases, Stripe, Slack) required rewriting integrations each time a model or tool changed. _Developers weighing custom integrations versus a standard protocol can track MCP developments on daily.dev._ ### How does MCP keep API keys and secrets secure when LLMs call tools? Secrets like API keys, connection strings, and tokens live inside the MCP server itself, so the LLM never sees them. The LLM only proposes which tool to invoke; the MCP server then validates the request, checks permissions, adds authentication, and calls the underlying API using its own credentials, avoiding the security risk of giving unpredictable LLMs direct API access. _Teams securing AI agent access to internal APIs can follow this kind of security pattern via daily.dev._ ### Do I need to build a separate MCP server for every tool I want to connect to an LLM? No, a single MCP server can aggregate multiple tools rather than requiring one server per tool. Zapier, for example, exposes over 5,000 tools through one MCP server, and companies can build a custom aggregator MCP server internally for tools like Postgres, Kubernetes, Prometheus, AWS, and Slack, simplifying deployment to one authentication layer and one endpoint to secure. _Engineers designing internal MCP server architecture can compare aggregation strategies through daily.dev._ ## Similar posts on daily.dev - [No Dumb Questions: What is an MCP server and why do I care?](https://daily.dev/posts/no-dumb-questions-what-is-an-mcp-server-and-why-do-i-care--mdqs1ffmm) · Stack Overflow Blog · 3 upvotes · 0 comments - [MCP for Technical Professionals: A Comprehensive Guide to Understanding and Implementing the Model Context Protocol](https://daily.dev/posts/mcp-for-technical-professionals-a-comprehensive-guide-to-understanding-and-implementing-the-model-c-xnb8mnykd) · Security Boulevard · 1 upvotes · 0 comments --- Tags: [#ai-agents](https://daily.dev/tags/ai-agents), [#architecture](https://daily.dev/tags/architecture), [#mcp](https://daily.dev/tags/mcp), [#tailscale](https://daily.dev/tags/tailscale) [View this post on daily.dev](https://daily.dev/posts/what-is-mcp-mcp-explained-simply-95uo2v6ar) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"What is MCP? MCP Explained Simply","url":"https://daily.dev/posts/what-is-mcp-mcp-explained-simply-95uo2v6ar","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/what-is-mcp-mcp-explained-simply-95uo2v6ar"},"datePublished":"2026-09-02T14:12:03.777Z","dateModified":"2026-09-14T08:47:53.791Z","description":"Model Context Protocol (MCP) is explained as a standardized communication layer between LLM applications and the tools/data sources they need to use...","image":"https://i.ytimg.com/vi/oblaHqULUHk/sddefault.jpg","thumbnailUrl":"https://i.ytimg.com/vi/oblaHqULUHk/sddefault.jpg","isAccessibleForFree":true,"articleSection":"TechWorld with Nana","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"TechWorld with Nana","logo":"https://media.daily.dev/image/upload/s--k4AAsort--/f_auto/v1728072817/logos/techworldwithnana","url":"https://daily.dev/sources/techworldwithnana"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/what-is-mcp-mcp-explained-simply-95uo2v6ar","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"ai-agents,architecture,mcp,tailscale","timeRequired":"PT30M","video":{"@type":"VideoObject","name":"What is MCP? MCP Explained Simply","description":"Model Context Protocol (MCP) is explained as a standardized communication layer between LLM applications and the tools/data sources they need to use...","thumbnailUrl":"https://i.ytimg.com/vi/oblaHqULUHk/sddefault.jpg","uploadDate":"2026-09-02T14:12:03.777Z","duration":"PT30M","url":"https://api.daily.dev/r/95UO2v6Ar","embedUrl":"https://www.youtube.com/embed/oblaHqULUHk"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"TechWorld with Nana","item":"https://daily.dev/sources/techworldwithnana"},{"@type":"ListItem","position":3,"name":"What is MCP? MCP Explained Simply"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/what-is-mcp-mcp-explained-simply-95uo2v6ar#faq","mainEntity":[{"@type":"Question","name":"What is the Model Context Protocol (MCP) and why was it created?","acceptedAnswer":{"@type":"Answer","text":"MCP is a standardized communication protocol that connects LLM-powered applications to external tools and data sources, replacing the custom integration code developers would otherwise write for every combination of AI model and tool. It was created because connecting multiple LLMs (like Claude, GPT-4, Gemini) to multiple data sources (databases, Stripe, Slack) required rewriting integrations each time a model or tool changed. Developers weighing custom integrations versus a standard protocol can track MCP developments on daily.dev."}},{"@type":"Question","name":"How does MCP keep API keys and secrets secure when LLMs call tools?","acceptedAnswer":{"@type":"Answer","text":"Secrets like API keys, connection strings, and tokens live inside the MCP server itself, so the LLM never sees them. The LLM only proposes which tool to invoke; the MCP server then validates the request, checks permissions, adds authentication, and calls the underlying API using its own credentials, avoiding the security risk of giving unpredictable LLMs direct API access. Teams securing AI agent access to internal APIs can follow this kind of security pattern via daily.dev."}},{"@type":"Question","name":"Do I need to build a separate MCP server for every tool I want to connect to an LLM?","acceptedAnswer":{"@type":"Answer","text":"No, a single MCP server can aggregate multiple tools rather than requiring one server per tool. Zapier, for example, exposes over 5,000 tools through one MCP server, and companies can build a custom aggregator MCP server internally for tools like Postgres, Kubernetes, Prometheus, AWS, and Slack, simplifying deployment to one authentication layer and one endpoint to secure. Engineers designing internal MCP server architecture can compare aggregation strategies through daily.dev."}}]} ```