Further detail doc on LLM choice

docs/source/en/guided_tour.md

@@ -30,20 +30,21 @@ To initialize a minimal agent, you need at least these two arguments:
 
 - `tools`, A list of `Tools` that the agent can use to solve the task. It can be an empty list. You can also add the default toolbox on top of your `tools` list by defining the optional argument `add_base_tools=True`.
 
-Once you have these two arguments, `tools` and `model`,  you can create an agent and run it. 
+Once you have these two arguments, `tools` and `model`,  you can create an agent and run it. You can use any LLM you'd like, either through [Hugging Face API](https://huggingface.co/docs/api-inference/en/index), [transformers](https://github.com/huggingface/transformers/), [ollama](https://ollama.com/), or [LiteLLM](https://www.litellm.ai/).
 
 <hfoptions id="Pick a LLM">
 <hfoption id="Hugging Face API">
 
+Hugging Face API is free to use without a token, but then it will have a rate limitation.
+
+To access gated models or rise your rate limits with a PRO account, you need to set the environment variable `HF_TOKEN` or pass `token` variable upon initialization of `HfApiModel`.
+
 ```python
 from smolagents import CodeAgent, HfApiModel
-from huggingface_hub import login
-
-login("<YOUR_HUGGINGFACEHUB_API_TOKEN>")
 
 model_id = "meta-llama/Llama-3.3-70B-Instruct"
 
-model = HfApiModel(model_id=model_id)
+model = HfApiModel(model_id=model_id, token="<YOUR_HUGGINGFACEHUB_API_TOKEN>")
 agent = CodeAgent(tools=[], model=model, add_base_tools=True)
 
 agent.run(
@@ -68,10 +69,12 @@ agent.run(
 </hfoption>
 <hfoption id="OpenAI or Anthropic API">
 
+To use `LiteLLMModel`, you need to set the environment variable `ANTHROPIC_API_KEY` or `OPENAI_API_KEY`, or pass `api_key` variable upon initialization.
+
 ```python
 from smolagents import CodeAgent, LiteLLMModel
 
-model = LiteLLMModel(model_id="anthropic/claude-3-5-sonnet-latest") # Could use 'gpt-4o'
+model = LiteLLMModel(model_id="anthropic/claude-3-5-sonnet-latest", api_key="YOUR_ANTHROPIC_API_KEY") # Could use 'gpt-4o'
 agent = CodeAgent(tools=[], model=model, add_base_tools=True)
 
 agent.run(
@@ -87,7 +90,7 @@ from smolagents import CodeAgent, LiteLLMModel
 model = LiteLLMModel(
     model_id="ollama_chat/llama3.2", # This model is a bit weak for agentic behaviours though
     api_base="http://localhost:11434", # replace with remote open-ai compatible server if necessary
-    api_key="your-api-key" # replace with API key if necessary
+    api_key="YOUR_API_KEY" # replace with API key if necessary
 )
 
 agent = CodeAgent(tools=[], model=model, add_base_tools=True)
@@ -99,13 +102,15 @@ agent.run(
 </hfoption>
 </hfoptions>
 
-#### Code execution
+#### CodeAgent and ToolCallingAgent
 
-A Python interpreter executes the code on a set of inputs passed along with your tools.
+The [`CodeAgent`] is our default agent. It will write and execute python code snippets at each step.
+
+By default, the execution is done in your local environment.
 This should be safe because the only functions that can be called are the tools you provided (especially if it's only tools by Hugging Face) and a set of predefined safe functions like `print` or functions from the `math` module, so you're already limited in what can be executed.
 
 The Python interpreter also doesn't allow imports by default outside of a safe list, so all the most obvious attacks shouldn't be an issue.
-You can authorize additional imports by passing the authorized modules as a list of strings in argument `additional_authorized_imports` upon initialization of your [`CodeAgent`] or [`CodeAgent`]:
+You can authorize additional imports by passing the authorized modules as a list of strings in argument `additional_authorized_imports` upon initialization of your [`CodeAgent`]:
 
 ```py
 from smolagents import CodeAgent
@@ -113,19 +118,25 @@ from smolagents import CodeAgent
 agent = CodeAgent(tools=[], model=model, additional_authorized_imports=['requests', 'bs4'])
 agent.run("Could you get me the title of the page at url 'https://huggingface.co/blog'?")
 ```
-This gives you at the end of the agent run:
-```text
-'Hugging Face – Blog'
-```
 
 > [!WARNING]
 > The LLM can generate arbitrary code that will then be executed: do not add any unsafe imports!
 
-The execution will stop at any code trying to perform an illegal operation or if there is a regular Python error with the code generated by the agent. You can also use [E2B code executor](https://e2b.dev/docs#what-is-e2-b) instead of a local Python interpreter by first [setting the `E2B_API_KEY` environment variable](https://e2b.dev/dashboard?tab=keys) and then passing `use_e2b_executor=True` upon agent initialization.
+The execution will stop at any code trying to perform an illegal operation or if there is a regular Python error with the code generated by the agent.
+
+You can also use [E2B code executor](https://e2b.dev/docs#what-is-e2-b) instead of a local Python interpreter by first [setting the `E2B_API_KEY` environment variable](https://e2b.dev/dashboard?tab=keys) and then passing `use_e2b_executor=True` upon agent initialization.
 
 > [!TIP]
 > Learn more about code execution [in this tutorial](tutorials/secure_code_execution).
 
+We also support the widely-used way of writing actions as JSON-like blobs: this is [`ToolCallingAgent`], it works much in the same way like [`CodeAgent`], of course without `additional_authorized_imports` since it doesn't execute code:
+
+```py
+from smolagents import ToolCallingAgent
+
+agent = ToolCallingAgent(tools=[], model=model)
+agent.run("Could you get me the title of the page at url 'https://huggingface.co/blog'?")
+```
 
 ### Inspecting an agent run