Add web search and weather tool documentation for Agentic RAG unit

units/en/unit3/agentic-rag/actualities.mdx

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+# Importing a Tool from the LlamaHub to Websearch Actualities
+
+Remember that we want Alfred to establish his presence as true renaissance host, with a deep knowledge of the world.
+
+To do so, we need to make sure that Alfred has access to the latest news and information about the world.
+
+Let's start by creating a web search tool for Alfred!
+
+## Websearch using DuckDuckGoSearchToolSpec
+
+Remember the [`ToolSpecs`](https://docs.llamaindex.ai/en/stable/module_guides/deploying/agents/tools/#tool-specs) from the previous unit?
+We can use them to create a web search tool for Alfred.
+Generally, when working with web search, DuckDuckGo is a good choice, as it is a search engine that is open to all and does not require any authentication.
+To create a web search tool for Alfred, we can use the [`DuckDuckGoSearchToolSpec`](https://llamahub.ai/l/tools/llama-index-tools-duckduckgo?from=).
+
+Let's create the tool spec for the web search tool.
+
+```python
+from llama_index.tools.duckduckgo import DuckDuckGoSearchToolSpec
+from llama_index.agent.openai import OpenAIAgent
+
+tool_spec = DuckDuckGoSearchToolSpec()
+
+agent = OpenAIAgent.from_tools(DuckDuckGoSearchToolSpec.to_tool_list())
+
+agent.chat("What are the latest developments in machine learning?")
+agent.chat("What does the word 'renaissance' mean?")
+```
+
+We can see that the agent is able to use the tool to search the web for information.
+
+Great, let's continue with a a tool that can help Alfred get the weather information!

units/en/unit3/agentic-rag/agentic-rag.mdx

@@ -25,10 +25,4 @@ However, instead of answering the question on top of documents automatically, Al
 
 ![Agentic RAG](https://huggingface.co/datasets/agents-course/course-images/resolve/main/en/unit2/agentic-rag.png)
 
-Let's start creating the tools for our agentic RAG workflow!
-
-
-
-
-
-
+Let's start **creating the web search and weather tools for our agentic RAG workflow!**

units/en/unit3/agentic-rag/gala.mdx

@@ -16,16 +16,13 @@ First, let's give him a list of hard requirements for the gala.
 
 A properly educated person in the age of the **renaissance** needs to have three main traits.
 He or she needed to profound in the **knowledge of sports, culture, and science**. So, we need to make sure we can impress our guests with our knowledge and provide them with a gala that is truly unforgettable.
+Although, to avoid any conflicts, there are some **topics, like politics and religion, that are to be avoided at a gala.** It needs to be an inclusive party without conflicts related to beliefs and ideals.
 
-According to etiquette, a good host also needs to be aware of all actualities in the news, as well as the information of any guests that might show up at a hosted party, including their allergies, and preferences.
-To avoid any confliect, there are some things that are just not acceptable at a gala because we want it to be an inclusive and open party, such as **politics** and **religion**.
+According to etiquette, **a good host need to be aware of all guest information**, including their life stories and endevours. A good host also gossips and shares stories about the guests with one another.
 
-Lastly, we need to make sure that we've got some general knowledge about the weather to ensure we can continuously find a real-time update to ensure perfect timing to launch the fireworks and end the gala with a bang! 🎆
+Lastly, we need to make sure that we've got **some general knowledge about the weather** to ensure we can continuously find a real-time update to ensure perfect timing to launch the fireworks and end the gala with a bang! 🎆
 
 As you can see, Alfred needs a lot of information to be able to host the gala.
-Luckily, we can help and prepare Alfred by giving him some Retrieval Augmented Generation (RAG) training!
-
-
-
-
+Luckily, we can help and prepare Alfred by giving him some **Retrieval Augmented Generation (RAG) training!**
 
+Let's start by creating the tools that Alfred needs to be able to host the gala!

units/en/unit3/agentic-rag/invitees.mdx

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+# Creating a RAG Tool for Guest Stories

units/en/unit3/agentic-rag/weather.mdx

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+# Creating a Custom Tool for Weather Information to Schedule the Fireworks
+
+Remember that we need to make sure the fireworks are not cancelled due to bad weather?
+
+As before, we can use a `ToolSpec` to create a tool for Alfred.
+When searching for `"weather"` in LlamaHub, we get a list of `ToolSpecs` that are relevant to weather.
+However, the tools that are available in the LlamaHub are not always what we need.
+Both returned tools require authentication with an API key, which is not what we want so we will create a custom tool.
+
+Let's create a custom tool that can be used to call an external weather API and get the weather information for a given location.
+
+```python
+
+```