--- title: Model Context Protocol (MCP) Explained: A Beginner’s Guide description: Model Context Protocol (MCP) is an open protocol that gives AI applications a standardized way to discover and interact with external tools, data, and... canonical: https://daily.dev/posts/model-context-protocol-mcp-explained-a-beginner-s-guide-a0noqdtsj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Model Context Protocol (MCP) Explained: A Beginner’s Guide | daily.dev og:description: Model Context Protocol (MCP) is an open protocol that gives AI applications a standardized way to discover and interact with external tools, data, and... og:url: https://daily.dev/posts/model-context-protocol-mcp-explained-a-beginner-s-guide-a0noqdtsj og:image: https://api.daily.dev/og/posts/a0NoQdtsj.png og:image:alt: Model Context Protocol (MCP) Explained: A Beginner’s Guide 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. # Model Context Protocol (MCP) Explained: A Beginner’s Guide **[Medium](https://daily.dev/sources/medium_js)** · 23 min read · 0 upvotes · 0 comments ## Summary Model Context Protocol (MCP) is an open protocol that gives AI applications a standardized way to discover and interact with external tools, data, and capabilities. The guide explains the three-layer architecture (AI model, MCP, underlying system), the host/client/server roles, and the three core primitives: tools (callable functions), resources (contextual data via URI), and prompts (reusable templates). A hands-on Python example using FastMCP demonstrates building a local stdio server exposing all three primitives and testing it with MCP Inspector. The guide also covers when to use MCP versus direct function calling or RAG, a real-world GPU regression investigation scenario, security best practices (narrow tools, human-in-the-loop, avoiding credential passthrough, prompt injection risks), and a six-level learning roadmap from vocabulary to production deployment. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#security](https://daily.dev/tags/security), [#python](https://daily.dev/tags/python), [#architecture](https://daily.dev/tags/architecture), [#ai-agents](https://daily.dev/tags/ai-agents), [#mcp](https://daily.dev/tags/mcp) [View this post on daily.dev](https://daily.dev/posts/model-context-protocol-mcp-explained-a-beginner-s-guide-a0noqdtsj) ```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":"Model Context Protocol (MCP) Explained: A Beginner’s Guide","url":"https://daily.dev/posts/model-context-protocol-mcp-explained-a-beginner-s-guide-a0noqdtsj","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/model-context-protocol-mcp-explained-a-beginner-s-guide-a0noqdtsj"},"datePublished":"2026-07-26T09:06:02.984Z","dateModified":"2026-07-26T09:07:08.211Z","description":"Model Context Protocol (MCP) is an open protocol that gives AI applications a standardized way to discover and interact with external tools, data, and...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/ab6df06a7efdea702a731d14759208bf?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/ab6df06a7efdea702a731d14759208bf?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Medium","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":"Medium","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/medium","url":"https://daily.dev/sources/medium_js"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/model-context-protocol-mcp-explained-a-beginner-s-guide-a0noqdtsj","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"security,python,architecture,ai-agents,mcp","timeRequired":"PT23M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Medium","item":"https://daily.dev/sources/medium_js"},{"@type":"ListItem","position":3,"name":"Model Context Protocol (MCP) Explained: A Beginner’s Guide"}]} ```