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all_nodes.png Tools are functions invoked by the LLM during inference. Note that not all LLMs support tools, and Mainly AI does not support tools for every capable model. Currently, the llm.generate_text node supports tools for:
  • OpenAI’s GPT models
  • Google’s Gemini models
  • BergetAI’s GPT OSS model
To create a new tool, drag a wire from the tools socket onto the canvas and select llm.construct_tool. This creates a template for your implementation. The implementation node is an API node that acts as the interface for your tool. The only method you need to implement is async __call__. Example: 
from mirmod import miranda

@wob.init()
def init(self):
  self.api = None

@wob.transmitter("model", "output")
def transmit_value(self):
  return self.api

@wob.execute()
async def execute(self):
  class API:
    async def __call__(self, city:str):
      return "It is going to be bad weather in {}".format(city)
  self.api = API()
The signature of the __call__ method defines the parameters the LLM should send to the tool. In some cases, you may need access to the internal state of the llm.generate_text node. To achieve this, define a function with the signature def inner_call(http=None, messages=None) and return this function instead of a standard string response. Returning this function prompts the llm.generate_text node to invoke it with the http and messages arguments. This provides access to HTTP-specific context and the message history, which you can then search or forward to another LLM. Example: 
from mirmod import miranda

@wob.init()
def init(self):
  self.api = None

@wob.transmitter("model", "output")
def transmit_value(self):
  return self.api

@wob.execute()
async def execute(self):
  class API:
    async def __call__(self, city:str):
      async def inner_call(http=None, messages=None):
        await http.event("delta","Send text through the http request API")
        return "It is going to be bad weather in {}".format(city)
      return inner_call
  self.api = API()
Tools can be useful even if they perform no functional action. For instance, an empty tool named “take_notes” will still be called by the LLM if it deems it relevant. This tool call is recorded in the message history, which the LLM sees. Consequently, the LLM “believes” it has taken notes, which influences its future inference. In this context, empty tools function as a “thinking” mechanism.

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llm.construct_tool

The implementation of the tool is wrapped behind a llm.construct_tool node. This node is an API node that acts as the interface for your tool. The only method you need to implement is async __call__. The llm.construct_tool node will automatically generate the necessary metadata for the tool, including the tool’s name, description, and parameters. The description can be provided by adding a def description(self) return "<description>" method to your API class, or it can be typed directly in the description field of the llm.construct_tool node. The name of the tool, from the point of view of the LLM, is written in the name field of the llm.construct_tool node. tool_description.png You can write the description of the tool in the tool implementatain node as well, and if you do then on the next exeuctioon thethe description field of the llm.construct_tool node will be updated with the description from the tool implementation node. Example: 
@wob.execute()
async def execute(self):
  class API:
    def description(self):
      return "Returns a really bad weather report from the specified city."
    async def __call__(self, city:str):
      async def inner_call(http=None, messages=None):
        await http.event("delta","Send text through the http request API")
        return "It is going to be bad weather in {}".format(city)
      return inner_call
  self.api = API()