chore(langchain-sdk): Update README (#58)

Author: twishabansal

README.md

@@ -4,27 +4,24 @@ This SDK allows you to seamlessly integrate the functionalities of
 [Toolbox](https://github.com/googleapis/genai-toolbox) into your LLM
 applications, enabling advanced orchestration and interaction with GenAI models.
 
-> [!NOTE]
-> Currently the SDK only supports [LangChain](https://python.langchain.com/docs/introduction/).
-
 <!-- TOC -->
 
 - [GenAI Toolbox SDK](#genai-toolbox-sdk)
     - [Installation](#installation)
     - [Usage](#usage)
     - [Load a toolset](#load-a-toolset)
+    - [Load a single tool](#load-a-single-tool)
     - [Use with LangChain](#use-with-langchain)
     - [Use with LangGraph](#use-with-langgraph)
         - [Represent Tools as Nodes](#represent-tools-as-nodes)
         - [Connect Tools with LLM](#connect-tools-with-llm)
     - [Manual usage](#manual-usage)
 
 <!-- /TOC -->
-
 ## Installation
 
 > [!IMPORTANT]
-> This SDK is not yet available on PyPI. For now, install it from source by following these [installation instructions](DEVELOPER.md) (up to step 3).
+> This SDK is not yet available on PyPI. For now, install it from source by following these [installation instructions](DEVELOPER.md).
 
 You can install the Toolbox SDK for LangChain using `pip`.
 
@@ -45,7 +42,7 @@ toolbox = ToolboxClient("http://localhost:5000")
 
 ## Load a toolset
 
-You can load a toolsets, that are collections of related tools.
+You can load a toolset, a collection of related tools.
 
 ```python
 # Load all tools
@@ -55,6 +52,14 @@ tools = await toolbox.load_toolset()
 tools = await toolbox.load_toolset("my-toolset")
 ```
 
+## Load a single tool
+
+You can also load a single tool.
+
+```python
+tool = await toolbox.load_tool("my-tool")
+```
+
 ## Use with LangChain
 
 LangChain's agents can dynamically choose and execute tools based on the user
@@ -82,6 +87,7 @@ follow the [official guide](https://langchain-ai.github.io/langgraph/) with
 minimal changes.
 
 ### Represent Tools as Nodes
+
 Each tool generated by the SDK can be represented as a LangGraph node. The
 node's functionality would encapsulate the execution of the corresponding tool.
 
@@ -141,4 +147,4 @@ You can also execute a tool manually using the `arun` method.
 
 ```python
 result = await tools[0].arun({ "name": "Alice", "age": 30 })
-```
+```