📚 MCP FUNDAMENTALS: Add Core Concepts Placeholder

MCP THEORY FOUNDATION:
✅ Added MCP Fundamentals explanation placeholder
✅ Covers essential concepts: Tools, Completions, Prompts, Elicitation, Roots, Resources
✅ Perfect positioning in Advanced Guide explanations section
✅ Links to practical MCP Foundation Workshop

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✅ The legendary quaternary: Beginners → Intermediate → Advanced → AYFKM

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src/content/docs/advanced/explanations/mcp-fundamentals.mdx

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+---
+title: "MCP Foundation: Tools, Prompts, and Resources"
+description: "Understanding the core concepts that power connected AI systems"
+---
+
+import { Aside, CardGrid, Card, LinkCard } from '@astrojs/starlight/components';
+
+<Aside type="note" title="🚧 Coming Soon">
+**Essential MCP concepts guide in development!** This comprehensive explanation of Model Context Protocol fundamentals will cover all the core concepts that power connected AI systems.
+
+**Core concepts you'll master:**
+- **Tools**: How AI capabilities are exposed and accessed
+- **Completions**: AI response generation in connected environments  
+- **Prompts**: Advanced prompting patterns for connected AI
+- **Elicitation**: Extracting optimal responses from connected AI systems
+- **Roots**: Access control and permission hierarchies
+- **Resources**: Data sources and system integrations
+
+**Expected availability:** Next development cycle
+</Aside>
+
+## MCP Fundamental Concepts
+
+Understanding these core concepts is essential for building sophisticated connected AI systems.
+
+<CardGrid>
+  <Card title="🛠️ Tools" icon="wrench">
+    The fundamental building blocks that give AI systems access to real-world capabilities and system functions.
+  </Card>
+  
+  <Card title="💬 Completions" icon="message">
+    How AI generates responses when connected to multiple systems and data sources simultaneously.
+  </Card>
+  
+  <Card title="📝 Prompts" icon="edit">
+    Advanced prompting techniques specifically designed for connected AI environments and multi-system coordination.
+  </Card>
+  
+  <Card title="🎯 Elicitation" icon="target">
+    Sophisticated techniques for extracting optimal performance from connected AI systems.
+  </Card>
+  
+  <Card title="🌳 Roots" icon="tree">
+    Access control hierarchies and permission systems that govern what connected AI can access and modify.
+  </Card>
+  
+  <Card title="📦 Resources" icon="package">
+    The data sources, system integrations, and external capabilities that connected AI systems can utilize.
+  </Card>
+</CardGrid>
+
+## Prerequisites
+
+<LinkCard
+  title="Build Your First Connected AI System"
+  description="Start with the MCP Foundation Workshop to gain hands-on experience before diving into theory"
+  href="/advanced/tutorials/mcp-foundation-workshop/"
+/>
+
+---
+
+*MCP concepts form the theoretical foundation for all connected AI development. Master these principles to build sophisticated AI ecosystems.*