Fixie Agent Quickstart

Fixie allows you to extend the capabilities of the Fixie Platform by building your own agents, which are specialized software components that combine a set of few-shot examples with code to invoke external systems. We call this combination of few-shots coupled with code Code Shots (clever, eh?).

You can implement Fixie agents in any programming language. However, the Fixie SDK currently provides bindings only for Python. See the Agent Protocol for details on implementing your own agent in a language other than Python. We'll be shipping bindings for other languages soon!

Create a Fixie Agent

The first step is to create a new agent directory using the fixie init command:

$ mkdir myagent
$ cd myagent
$ fixie init
Handle [myagent]:
Description []: A simple test agent.
Entry point [main:agent]:
More info url []:

fixie init will prompt you to enter some information about your agent.

  • Handle: the unique identifier used to identify the agent in the Fixie Platform.
  • Description: an optional plain-text description of the agent's abilities.
  • Entry point: the name of the Python module that contains the agent code, which we will create in the next step below.
  • More info url: an optional URL that you can provide, which offers more information about the agent. This can point to any website.
  • Public: flag indicates whether the agent should be publicly visible in the Fixie Platform for other users. If you set this to True, anyone can use your agent in their own applications.

Running fixie init will create the file agent.yaml in the current directory, containing metadata on the agent.

Write the Agent Code

Next, paste the following code into a file called

import random
import fixieai

BASE_PROMPT = "I am a simple agent that generates a random number between two given values."
Q: Generate a random number between 0 and 19.
Ask Func[genrand]: 0, 19
Func[genrand] says: 17
A: The random number is 17.

Q: Generate a random value from 5 to 10, inclusive.
Ask Func[genrand]: 5, 10
Func[genrand] says: 8
A: The random number is 8.

agent = fixieai.CodeShotAgent(BASE_PROMPT, FEW_SHOTS)

def genrand(query: fixieai.Message) -> str:
    low, high = query.text.replace(" ", "").split(",")
    return str(random.randint(int(low), int(high)))

The code consists of two main parts:

  • BASE_PROMPT and FEW_SHOTS: These are the few-shot examples that define the agent's purpose and behavior. The few-shots are used to provide examples to the underlying Large Language Model, such as GPT-4, as well as to provide the Fixie Platform information on what kinds of queries this agent can support.
  • Code snippets: These are the functions that are invoked by the Code Shots. The code snippets are registered with the agent using the register_func decorator.

In the FEW_SHOTS string, the Func[genrand] keyword indicates that the function genrand should be invoked when the output of the underlying LLM starts with this string. The values following Ask Func[genrand]: are passed to the function as the query.text parameter. In this case, the function parses out the values and returns a random number between those two values.

Test Your Agent

To test your agent, you have two options:

  1. Run it on your local machine using the fixie agent serve command. This allows you to see the debugging logs of your agent directly in your console.
  2. Deploy it to the Fixie platform using the fixie agent deploy command.

Whichever option you choose, you can still use the Fixie Platform (e.g. REST API, GraphQL API, or web app) to access your agent.

$ fixie agent serve
Opening tunnel to via
🦊 Agent mdw/myagent running locally on, served via
You can access your agent via or `fixie console --agent mdw/myagent`.

When running fixie agent serve, a tunnel is set up that allows the agent, running on your local machine, to be accessed from the Fixie Platform. The URL of the tunnel is printed on the console. If you quit the fixie agent serve process (e.g., by pressing Ctrl-C), the tunnel is torn down and your agent is no longer accessible.

You can now use fixie console or fixie console --agent <username>/<agent_name> to send a message to your agent directly:

$ fixie console
Welcome to Fixie!
Connected to:
fixie 🦊❯ @mdw/myagent Generate a random number between 10 and 50
   @user: @mdw/myagent Generate a random number between 10 and 50
   @myagent: Generate a random number between 10 and 50
   @myagent: Ask Func: 10, 50
   @myagent: Func says: 48
   @myagent: The random number is 48.
1 The random number is 48.

In the fixie agent serve window, you should also see debugging output showing that your agent code was invoked with a POST request to the /genrand endpoint.

Deploy Your Agent

Agents can be deployed on any web server that supports Python. Alternatively, you can deploy your agent directly to the Fixie platform, which will handle hosting the agent functions in the cloud.

To deploy your agent, simply run fixie agent deploy:

$ fixie agent deploy
✅ Deploying...
✅ Refreshing...

This process takes about a minute to complete. Once deployed, you can use your agent via the Fixie Web UI or the fixie console tool.


Once deployed (via fixie agent serve or fixie agent deploy), your agent can also be invoked via a REST API, using a POST request to the endpoint /api/agents/<username>/<agent_handle>. For example, the fixie/calc agent can be invoked as follows:

$ export FIXIE_API_KEY=<Your Fixie API key>
$ curl \
  -H "Authorization: Bearer ${FIXIE_API_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{ "message": {"text": "What is 999 + 222?" }}'

Your Fixie API key can be obtained from your user profile page.

Fixie GraphQL API

Apart from the Agent REST API described above, the Fixie GraphQL API is a more rich and powerful API surface for interacting with Fixie, including creating agents, sending messages, and more. For more information, see the Fixie GraphQL API documentation.

Implementing Agents without Python

Refer to the Agent Protocol documentation for details on implementing an agent in a language other than Python. For complete information on the Fixie Agent API, see Agent API.