Getting started with Fetch.ai and Swarm

Fetch.ai creates a dynamic communication layer that allows you to abstract away components into individual Agents . Agents are microservices programmed to communicate with other agents, and or humans. Written in python, agents are designed to run independently across many and any device.

By using Agents to integrate with Swarm, you add a layer which can control a narrative and introduce Swarm Agents to a wider ecosystem.

Let's take a look at a simple Swarm example, then see how we can extend this with the uAgents Framework and the Bureau class.

A simple Swarm example

Installation

pip install git+ssh://git@github.com/openai/swarm.git

Code

From the Swarm docs, we are going to extend their example:


from swarm import Swarm, Agent
 
client = Swarm()
 
def transfer_to_agent_b():
    return agent_b
 
agent_a = Agent(
    name="Agent A",
    instructions="You are a helpful agent.",
    functions=[transfer_to_agent_b],
)
 
agent_b = Agent(
    name="Agent B",
    instructions="Only speak in Haikus.",
)
 
response = client.run(
    agent=agent_a,
    messages=[{"role": "user", "content": "I want to talk to agent B."}],
)
 
print(response.messages[-1]["content"])

There's a few really nice concepts here, functions and instructions. Functions allow the Agent to call another function or act on the data being sent in client.run(), this function can also return an agent which passes the message chat to that new agent. Instructions are the prompts; we'll use Agents to update these in the future.

A simple communication with agents

In many other places in our documentation, we have Agent examples for creation, communication and beginner guides. If you've never built using the uAgents Framework before, please have a look at these guides to get yourself started:

You can read more about Agents and Agent Functions communication in our guides (opens in a new tab)

The integration with Swarm below is quite simple, so we can skip over a lot of Agents information, for brevity.

Swarm x uAgents Framework

We use Bureau for this example, our multi-agent runner that works very similarly to Swarm loop examples. For us, Bureau is a great way of running many Agents on one single device. Our plan here is fairly simple, we want Agents to control the narrative of the Swarm by creating the questions best suited to the response.

So let's extend it.

swarm_bureau.py
 
from swarm import Swarm, Agent
from swarm import Agent as SwarmAgent
from uagents import Agent, Model, Bureau, Context
 
client = Swarm()
 
 
def transfer_to_agent_b():
    return swarm_agent_b
 
 
def transfer_to_agent_c():
    return swarm_agent_c
 
 
def helpful(context_variables):
    resp = "You are a quizzical agent. Answer their question in a riddle. Do not answer in a Haiku."
    ctx = context_variables["personality"] if context_variables["personality"] else ""
    print(ctx)
    if "friendly" in ctx:
        return f"{resp} be sure to give them lots of clues, make the riddle not too difficult to answer"
    else:
        return f"{resp}"
 
 
swarm_agent_a = SwarmAgent(
    name="Agent A",
    instructions="You are a helpful agent.",
    functions=[transfer_to_agent_b],
)
 
swarm_agent_b = SwarmAgent(
    name="Agent B",
    instructions="Only speak in Haikus. Find out what they want",
    functions=[transfer_to_agent_c]
)
 
swarm_agent_c = SwarmAgent(
    name="Agent C",
    instructions=helpful,
)
 
swarm_agent_d = SwarmAgent(
    name="Question generator",
    instructions="Create a random question to ask someone about any animal"
)
 
 
class Request(Model):
    text: str
 
 
class Response(Model):
    text: str
 
 
class QuestionCreation(Model):
    text: str
 
 
class QuestionCreated(Model):
    text: str
 
 
swarm_uagent = Agent(name='Swarm')
trigger_uagent = Agent(name='Trigger')
question_uagent = Agent(name='Question')
 
 
@swarm_uagent.on_message(Request)
async def handle_request(ctx: Context, sender: str, request: Request):
    response = client.run(
        agent=swarm_agent_a,
        messages=[{"role": "user", "content": request.text}],
    )
 
    await ctx.send(sender, Response(text=response.messages[-1]["content"]))
 
 
@trigger_uagent.on_event('startup')
async def trigger_request(ctx: Context):
    await ctx.send(swarm_uagent.address, Request(text="I want to talk to agent B."))
 
 
@trigger_uagent.on_message(Response)
async def handle_response(ctx: Context, sender: str, response: Response):
    print(f"Response from on_message : {response.text}")
    await ctx.send(question_uagent.address, QuestionCreation(text=""))
 
 
@trigger_uagent.on_message(QuestionCreated)
async def handle_response(ctx: Context, sender: str, response: Response):
    print(f"Response from on_message :", response.text)
 
    response = client.run(
        agent=swarm_agent_c,
        messages=[{"role": "user", "content": response.text}],
        context_variables={"user": "Jessica", "personality": "friendly, kind"}
    )
 
    print(response.messages[-1]["content"])
 
 
@question_uagent.on_message(QuestionCreation)
async def create_question(ctx: Context, sender: str, question: QuestionCreation):
    print("creating question...")
 
    response = client.run(
        agent=swarm_agent_d,
        messages=[{"role": "user", "content": "Create a random question about any animal"}],
    )
 
    print(response.messages[-1]["content"])
 
    await ctx.send(sender, QuestionCreated(text=response.messages[-1]["content"]))
 
 
bureau = Bureau()
bureau.add(swarm_uagent)
bureau.add(trigger_uagent)
bureau.add(question_uagent)
bureau.run()

There's a lot of code there, but so let's cover the Agent specific bits first:

We imported uagents first:

swarm_bureau.py
 
from uagents import Agent, Model, Bureau, Context

We defined our message structures:

swarm_bureau.py
 
class Request(Model):
    text: str
 
 
class Response(Model):
    text: str
 
 
class QuestionCreation(Model):
    text: str
 
 
class QuestionCreated(Model):
    text: str

Within the uAgents Framework this is pretty important, and can be much more complex than the above. We treat Message classes as our rules of communication, generally in a Request/Response format. It also enforces type that helps keep Agents resilient. For additional information on how Agents do communicate, have a look at the following resource .

Next, we instantiate our Agents and create message handling functions :

swarm_bureau.py
 
swarm_uagent = Agent(name='Swarm')
trigger_uagent = Agent(name='Trigger')
question_uagent = Agent(name='Question')
 
 
@swarm_uagent.on_message(Request)
async def handle_request(ctx: Context, sender: str, request: Request):
    response = client.run(
        agent=swarm_agent_a,
        messages=[{"role": "user", "content": request.text}],
    )
 
    await ctx.send(sender, Response(text=response.messages[-1]["content"]))
 
 
@trigger_uagent.on_event('startup')
async def trigger_request(ctx: Context):
    await ctx.send(swarm_uagent.address, Request(text="I want to talk to agent B."))
 
 
@trigger_uagent.on_message(Response)
async def handle_response(ctx: Context, sender: str, response: Response):
    print(f"Response from on_message : {response.text}")
    await ctx.send(question_uagent.address, QuestionCreation(text=""))
 
 
@trigger_uagent.on_message(QuestionCreated)
async def handle_response(ctx: Context, sender: str, response: Response):
    print(f"Response from on_message :", response.text)
 
    response = client.run(
        agent=swarm_agent_c,
        messages=[{"role": "user", "content": response.text}],
        context_variables={"user": "Jessica", "personality": "friendly, kind"}
    )
 
    print(response.messages[-1]["content"])
 
 
@question_uagent.on_message(QuestionCreation)
async def create_question(ctx: Context, sender: str, question: QuestionCreation):
    print("creating question...")
 
    response = client.run(
        agent=swarm_agent_d,
        messages=[{"role": "user", "content": "Create a random question about any animal"}],
    )
 
    print(response.messages[-1]["content"])
 
    await ctx.send(sender, QuestionCreated(text=response.messages[-1]["content"]))
 
 
bureau = Bureau()
bureau.add(swarm_uagent)
bureau.add(trigger_uagent)
bureau.add(question_uagent)
bureau.run()

The important thing to note is that Agents have specific functions to handle different message objects being received; the uAgents library in the background calls the correct function based on decorator and args. When an Agent calls await ctx.send(sender, Message()) that effectively calls another Agent's function to act on the sent data.

We have extended the Swarm example slightly; we want to use context variables but also use an Agent to generate the question on our behalf.

swarm_bureau.py
 
 
def helpful(context_variables):
    resp = "You are a quizzical agent. Answer their question in a riddle. Do not answer in a Haiku."
    ctx = context_variables["personality"] if context_variables["personality"] else ""
    print(ctx)
    if "friendly" in ctx:
        return f"{resp} be sure to give them lots of clues, make the riddle not too difficult to answer"
    else:
        return f"{resp}"

swarm_bureau.py
 
swarm_agent_c = SwarmAgent(
    name="Agent C",
    instructions=helpful,
)
 
swarm_agent_d = SwarmAgent(
    name="Question generator",
    instructions="Create a random question to ask someone about any animal"
)

The context_variable was set in an Agent message handler:

swarm_bureau.py
 
@trigger_uagent.on_message(QuestionCreated)
async def handle_response(ctx: Context, sender: str, response: Response):
    print(f"Response from on_message :", response.text)
 
    response = client.run(
        agent=swarm_agent_c,
        messages=[{"role": "user", "content": response.text}],
        context_variables={"user": "Jessica", "personality": "friendly, kind"}
    )
 
    print(response.messages[-1]["content"])

Let's now recap the flow:

Expected Output

Run poetry run python langchain_agent_two.py first and then poetry run python langchain_agent_one.py.

You should get something similar to the following for the bureau:


	INFO:httpx:HTTP Request: POST https://api.openai.com/v1/chat/completions "HTTP/1.1 200 OK"
	Response from on_message : To have a chat with Agent B,  
	Look to the hive with golden key.  
	If none can find, then change the tone,  
	And talk to shadows made of stone.
	creating question...
	INFO:httpx:HTTP Request: POST https://api.openai.com/v1/chat/completions "HTTP/1.1 200 OK"
	If you could transform into any animal for a day, which one would you choose and why?
	INFO:     [bureau]: Starting server on http://0.0.0.0:8000 (Press CTRL+C to quit)
	Response from on_message : If you could transform into any animal for a day, which one would you choose and why?
	friendly, kind
	INFO:httpx:HTTP Request: POST https://api.openai.com/v1/chat/completions "HTTP/1.1 200 OK"
	In the sky so high, I soar with might,  
	With wings so vast, I dance with light.  
	I see the world in colors bright,  
	A fish below, a mouse in flight.  
	Majestic, noble, called king of skies,  
	Which creature would I be in disguise?

Next steps

This has been a brief introduction into Swarm and Fetch.ai.

For further reading on how and where we use other OpenAI, technology take a look at the following resource for RAG Agents (opens in a new tab).

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Multi-agent workflows with Fetch.ai x Langchain Integration of uAgents with Anthropic's Computer Use Demo