docs: add Ecosystem page with links to RubyLLM::MCP and RubyLLM::Schema

- Create new Ecosystem documentation page with descriptions and links
- Update navigation to include all guides (adds missing Async and Available Models)
- Add Ecosystem page and Blog link to navigation

Author: crmne

docs/_data/navigation.yml

@@ -25,5 +25,13 @@
       url: /guides/error-handling
     - title: Models
       url: /guides/models
+    - title: Async
+      url: /guides/async
+    - title: Available Models
+      url: /guides/available-models
+- title: Ecosystem
+  url: /ecosystem
 - title: GitHub
   url: https://github.com/crmne/ruby_llm
+- title: Blog
+  url: https://paolino.me

docs/ecosystem.md

@@ -0,0 +1,97 @@
+---
+layout: default
+title: Ecosystem
+nav_order: 4
+permalink: /ecosystem
+---
+
+# Ecosystem
+{: .no_toc }
+
+The RubyLLM ecosystem includes complementary libraries that extend the core functionality to support advanced use cases like Model Context Protocol (MCP) integration and structured data schemas.
+{: .fs-6 .fw-300 }
+
+## Table of contents
+{: .no_toc .text-delta }
+
+1. TOC
+{:toc}
+
+---
+
+## RubyLLM::MCP
+
+**Model Context Protocol Support for Ruby**
+
+[RubyLLM::MCP](https://github.com/patvice/ruby_llm-mcp) brings the [Model Context Protocol](https://modelcontextprotocol.io/) to Ruby, enabling your applications to connect to MCP servers and use their tools, resources, and prompts as part of LLM conversations.
+
+### What is MCP?
+
+The Model Context Protocol is an open standard that allows AI applications to integrate with external data sources and tools. MCP servers can expose:
+
+- **Tools**: Functions that LLMs can call to perform actions
+- **Resources**: Structured data that can be included in conversations
+- **Prompts**: Predefined prompt templates with parameters
+
+### Key Features
+
+- 🔌 Multiple transport types (HTTP streaming, STDIO, SSE)
+- 🛠️ Automatic tool integration with RubyLLM
+- 📄 Resource management for files and data
+- 🎯 Prompt templates with arguments
+- 🔄 Support for multiple simultaneous MCP connections
+
+### Installation
+
+```bash
+gem install ruby_llm-mcp
+```
+
+For detailed documentation, examples, and usage guides, visit the [RubyLLM::MCP documentation](https://rubyllm-mcp.com/).
+
+---
+
+## RubyLLM::Schema
+
+**Ruby DSL for JSON Schema Creation**
+
+[RubyLLM::Schema](https://github.com/patvice/ruby_llm-schema) provides a clean, Rails-inspired DSL for creating JSON schemas. It's designed specifically for defining structured data schemas for LLM function calling and structured outputs.
+
+### Why Use RubyLLM::Schema?
+
+When working with LLMs, you often need to define precise data structures for:
+
+- Structured output formats
+- Function parameter schemas
+- Data validation schemas
+- API response formats
+
+RubyLLM::Schema makes this easy with a familiar Ruby syntax.
+
+### Key Features
+
+- 📝 Rails-inspired DSL for intuitive schema creation
+- 🎯 Full JSON Schema compatibility
+- 🔧 Support for all primitive types, objects, and arrays
+- 🔄 Union types with `any_of`
+- 📦 Schema definitions and references for reusability
+
+### Installation
+
+```bash
+gem install ruby_llm-schema
+```
+
+For detailed documentation and examples, visit the [RubyLLM::Schema repository](https://github.com/patvice/ruby_llm-schema).
+
+---
+
+## Community Projects
+
+The RubyLLM ecosystem is growing! If you've built a library or tool that extends RubyLLM, we'd love to hear about it. Consider:
+
+- Opening a PR to add your project to this page
+- Sharing it in our GitHub Discussions
+- Using the `ruby_llm` topic on your GitHub repository
+
+Together, we're building a comprehensive ecosystem for LLM-powered Ruby applications.