chore: Revise README for clarity and consistency

Merge #3335

Updated terminology in README for clarity and consistency.

COPYBARA_INTEGRATE_REVIEW=#3335 from Shubhamsaboo:patch-1 57d574e
PiperOrigin-RevId: 826105701

Author: Shubhamsaboo

README.md

@@ -11,7 +11,7 @@
       <img src="https://raw.githubusercontent.com/google/adk-python/main/assets/agent-development-kit.png" width="256"/>
     </h2>
     <h3 align="center">
-      An open-source, code-first Python toolkit for building, evaluating, and deploying sophisticated AI agents with flexibility and control.
+      An open-source, code-first Python framework for building, evaluating, and deploying sophisticated AI agents with flexibility and control.
     </h3>
     <h3 align="center">
       Important Links:
@@ -22,7 +22,11 @@
     </h3>
 </html>
 
-Agent Development Kit (ADK) is a flexible and modular framework for developing and deploying AI agents. While optimized for Gemini and the Google ecosystem, ADK is model-agnostic, deployment-agnostic, and is built for compatibility with other frameworks. ADK was designed to make agent development feel more like software development, to make it easier for developers to create, deploy, and orchestrate agentic architectures that range from simple tasks to complex workflows.
+Agent Development Kit (ADK) is a flexible and modular framework that applies
+software development principles to AI agent creation. It is designed to
+simplify building, deploying, and orchestrating agent workflows, from simple
+tasks to complex systems. While optimized for Gemini, ADK is model-agnostic,
+deployment-agnostic, and compatible with other frameworks.
 
 ---
 
@@ -37,7 +41,7 @@ Agent Development Kit (ADK) is a flexible and modular framework for developing a
 ## ✨ Key Features
 
 - **Rich Tool Ecosystem**: Utilize pre-built tools, custom functions,
-  OpenAPI specs, or integrate existing tools to give agents diverse
+  OpenAPI specs, MCP tools or integrate existing tools to give agents diverse
   capabilities, all for tight integration with the Google ecosystem.
 
 - **Code-First Development**: Define agent logic, tools, and orchestration
@@ -54,13 +58,6 @@ Agent Development Kit (ADK) is a flexible and modular framework for developing a
 - **Deploy Anywhere**: Easily containerize and deploy agents on Cloud Run or
   scale seamlessly with Vertex AI Agent Engine.
 
-## 🤖 Agent2Agent (A2A) Protocol and ADK Integration
-
-For remote agent-to-agent communication, ADK integrates with the
-[A2A protocol](https://github.com/google-a2a/A2A/).
-See this [example](https://github.com/a2aproject/a2a-samples/tree/main/samples/python/agents)
-for how they can work together.
-
 ## 🚀 Installation
 
 ### Stable Release (Recommended)
@@ -84,6 +81,13 @@ pip install git+https://github.com/google/adk-python.git@main
 
 Note: The development version is built directly from the latest code commits. While it includes the newest fixes and features, it may also contain experimental changes or bugs not present in the stable release. Use it primarily for testing upcoming changes or accessing critical fixes before they are officially released.
 
+## 🤖 Agent2Agent (A2A) Protocol and ADK Integration
+
+For remote agent-to-agent communication, ADK integrates with the
+[A2A protocol](https://github.com/google-a2a/A2A/).
+See this [example](https://github.com/a2aproject/a2a-samples/tree/main/samples/python/agents)
+for how they can work together.
+
 ## 📚 Documentation
 
 Explore the full documentation for detailed guides on building, evaluating, and