Want to Become a Sponsor? Contact Us Now!🎉

Mistral AI Function Calling: How to Quickly Get Started

Mistral AI Function Calling: How to Quickly Get Started

Published on

Explore the transformative power of MistralAI's function calling feature, which enables AI models to interact with external tools and databases, offering a comprehensive guide complete with practical examples and code snippets.

Imagine you're in the midst of crafting an intricate machine, one that's meant to think, learn, and interact much like a human would. This machine, powered by the latest advancements in artificial intelligence, is close to mimicking the nuanced decision-making process of its creators. Now, imagine if this machine could reach beyond its core capabilities, tapping into a vast network of external tools and databases, enriching its responses with real-time data and personalized functionalities. This is not a snippet from a science fiction novel; it's the reality of working with MistralAI and its revolutionary function calling feature.


MistralAI stands at the forefront of this innovative frontier, offering a seamless blend of artificial intelligence with the practicality of external tools and APIs. This powerful combination allows MistralAI to not just generate text but to interact with databases, execute functions, and provide answers grounded in real-time data and specific user contexts.

In this article, we'll dive deep into the heart of MistralAI's function calling capability:

  • Discover what function calling is and why it's a game-changer for AI applications.
  • Learn the step-by-step process of integrating MistralAI with external tools.
  • Uncover practical examples of how this feature can be applied to solve real-world problems.

Understanding Function Calling with MistralAI

What is Function Calling in the Context of MistralAI?

Function calling, in the realm of MistralAI, is akin to giving the model a magic wand. With it, MistralAI can invoke external tools or functions, allowing it to fetch data, perform computations, or even interact with other software services. This capability transforms the model from a static generator of text into a dynamic assistant capable of engaging with the world in meaningful ways.

Why is Connecting Mistral Models to External Tools and Databases Important?

  • Enhanced Capabilities: By accessing external databases and tools, MistralAI can provide up-to-date information, personalized responses, and perform complex tasks that go beyond generating text.
  • Versatility in Applications: This opens up a myriad of applications, from answering specific queries with current data to performing tasks like booking appointments or sending notifications.
  • Customization for User Needs: Developers can tailor the AI's capabilities to fit specific use cases, making MistralAI an invaluable tool across various industries.

This integration of AI with external functionalities marks a pivotal shift in how we perceive and interact with machine learning models. It's not just about what the AI knows now, but what it can learn and do for you in real-time. Stay tuned as we explore the mechanics of this integration and how you can harness it to elevate your AI applications.

The Four-Step Process of Function Calling

Embarking on a journey through MistralAI's function calling process is akin to navigating a river with a series of locks. Each step represents a lock, guiding the flow of information and action smoothly from one section to the next. Let’s navigate through this process.

Step 1: User Specifies Tools and Query

How Can Users Define Tools for Their Specific Use Cases?

Imagine you're a chef in a kitchen filled with ingredients (data) and utensils (tools). Just as a chef selects the right utensil for a task, you can specify tools in MistralAI to interact with your data. This specification is done using a JSON schema, a blueprint that tells MistralAI how to understand and interact with your external tools.

Consider this example schema for a tool that retrieves payment status:

  "type": "function",
  "function": {
    "name": "retrieve_payment_status",
    "description": "Get payment status of a transaction",
    "parameters": {
      "type": "object",
      "properties": {
        "transaction_id": {
          "type": "string",
          "description": "The transaction id."
      "required": ["transaction_id"]

This JSON schema acts as a recipe, guiding MistralAI on how to use the tool.

How to Organize Functions for Easy Access?

After defining your tools, it’s crucial to organize them for easy access. Consider a library system, where books are cataloged and easily retrievable. Similarly, functions are stored in a dictionary (or any data structure that suits your workflow), ensuring they can be efficiently called upon when needed.

import functools
# Assuming df is your DataFrame with payment data
names_to_functions = {
    'retrieve_payment_status': functools.partial(retrieve_payment_status, df=df),

Step 2: Model Generates Function Arguments

How Do Mistral Models Identify the Appropriate Function?

MistralAI, like a detective piecing together clues from a scene, examines the user's query to determine which tool (function) is best suited to answer it. This decision-making process involves matching the query's intent with the functions' descriptions and parameters defined in the JSON schema.

Detailing the Process of Generating Necessary Arguments

Once the appropriate function is identified, MistralAI then generates the necessary arguments required to execute the function. It’s akin to gathering ingredients for a recipe after deciding what to cook.

# User query: "What's the status of my transaction T1001?"
# MistralAI generates: {"transaction_id": "T1001"}

Step 3: User Executes Function to Obtain Results

The User's Role in Executing the Function

After the function and its arguments are identified, it's time for execution, much like turning on the stove to start cooking. This execution is currently performed by the user (or the user's system), which involves calling the specified function with the provided arguments to obtain results.

# Execute the function
function_result = names_to_functions['retrieve_payment_status'](transaction_id="T1001")

Potential for Server-Side Execution of Functions

Looking ahead, there's the exciting potential for MistralAI to handle function execution directly, streamlining the process further by automating what is now a manual step.

Step 4: Model Generates Final Answer

How Mistral Models Use the Output to Produce a Customized Final Response

With the function executed and results in hand, MistralAI then crafts a final response tailored to the user's query. This step is akin to plating a dish, where the cooked ingredients are presented in a way that's ready to be enjoyed.

# With the output '{"status": "Paid"}', MistralAI can generate a response:
"The status of your transaction T1001 is 'Paid'."

Through these four steps, MistralAI function calling transforms a simple query into actionable insights, leveraging external tools and databases to deliver responses that are both accurate and deeply personalized. This process, emblematic of the fusion between AI and real-world data, opens new horizons for developers and businesses alike, enabling them to create more dynamic, responsive, and intelligent applications.

Practical Example: Payment Status Inquiry

Navigating the process of function calling with MistralAI can seem complex, but it unfolds naturally once you dive into a practical example. Let’s explore how to inquire about a payment status using MistralAI integrated with LangChain.

Step-by-Step Walkthrough

Step 1: Setting Up Your Environment

First, ensure you have the necessary setup for integrating MistralAI with LangChain:

npm install @langchain/mistralai

This command sets up your project to use MistralAI's models via LangChain, a framework that simplifies interactions with AI models and external tools.

Step 2: Defining the Tool

Suppose you have a function that checks the payment status based on a transaction ID:

def check_payment_status(transaction_id):
    # Mock database query
    payment_records = {
        "T1001": "Paid",
        "T1002": "Pending",
        "T1003": "Failed",
    return payment_records.get(transaction_id, "Not Found")

Step 3: Integrating the Function with LangChain

To make this function callable through MistralAI, define it as a StructuredTool in LangChain:

from langchain.llms import StructuredTool
from zod import z
class PaymentStatusTool(StructuredTool):
    name = "check_payment_status"
    description = "Checks the payment status for a given transaction ID."
    schema = z.object({
        "transaction_id": z.string(),
    async def _call(self, input):
        status = check_payment_status(input["transaction_id"])
        return {"status": status}

Step 4: Querying the Model

With your tool defined, you can now query the model. Here’s how you might set up a simple interaction using LangChain:

from langchain.llms import ChatMistralAI
from langchain.prompts import ChatPromptTemplate
# Assuming you've already set up your API key and model
model = ChatMistralAI(api_key="YOUR_API_KEY", model_name="mistral-small")
prompt = ChatPromptTemplate.from_messages([
    ["system", "You are an assistant capable of checking payment statuses."],
    ["human", "What is the status of transaction T1001?"],
response = await model.chat(prompt)
print("Response:", response)

This setup sends a message to MistralAI, indicating the user's request to check a payment status. The model, recognizing the structured tool and its capabilities, executes the function to retrieve the status and returns a response.

Integrating External Tools with MistralAI

The broader implications of function calling in MistralAI, especially when integrated with frameworks like LangChain, are profound:

  • Enhanced Interaction: Beyond simple text generation, your AI models can now interact with databases, APIs, and custom logic, making them incredibly versatile.
  • Customizable Workflows: You can tailor AI capabilities to specific needs, from customer service bots checking order statuses to personal assistants managing schedules.
  • Scalable Solutions: As your data sources and tools evolve, your MistralAI integrations can grow with them, adapting to new requirements and opportunities.

Through LangChain, MistralAI’s function calling becomes more accessible, allowing developers to weave complex AI-powered applications with fewer barriers. This integration opens up a world where AI doesn’t just generate text—it interacts, solves, and assists in ways previously confined to the realm of imagination.


As we've journeyed through the intricacies of MistralAI's function calling, from defining tools and queries to executing functions and generating responses, it's clear that the horizon of AI's capabilities is expanding. Through practical examples and the integration of external tools, we've seen how AI can be transformed into a dynamic entity capable of interacting with the world in real-time, offering personalized and actionable insights. The integration of MistralAI with frameworks like LangChain not only simplifies these interactions but also paves the way for innovative applications across various domains. As developers and innovators, we stand on the brink of a new era in AI, where our creations can do more than just understand and generate text; they can act, analyze, and assist in ways that bring us closer to the seamless integration of artificial intelligence into our daily lives.

Want to learn the latest LLM News? Check out the latest LLM leaderboard!

Anakin AI - The Ultimate No-Code AI App Builder