DAGent - Directed Acyclic Graphs (DAGs) as AI Agents

DAGent is an opinionated Python library to create AI Agents quickly without overhead

Quickstart

Installing

pip install dagent or rye add dagent
Make sure you have the API key of your choice available in system. The default is OPENAI_API_KEY

Get right into it

See dagent/examples/quickstart_simple_agent.py for a quickstart example

DAGent basics

The idea behind dagent is to structure AI agents in to a workflow. This is done through setting each function up as a node in a graph.

The agentic behavior is through the inferring of what function to run through the use of LLMs which is abstracted by a "Decision Node".

Tool

A tool is just a function which the LLM can use.
It is helpful to have docstrings and annotations to assist the llm infer what is happening. This is recommended for larger functions/tools.

FunctionNode

Runs a python function
Can be attached to a DecisionNode to be treated as a tool and allow an LLM to choose which function to run

DecisionNode

This is where the llm picks a function to run from given options
The .compile() method autogenerates and saves tool descriptions under Tool. Run with param force_load=True if there are errors or if an option of tool changes
These tool/function descriptions get generated under a Tool_JSON folder. Feel free to edit tool descriptions if the agent is unreliable.

prev_output param for functions:

If passing data from one function to another, make sure this param is in the function signature.
If extra params get passed in/weird stuff happens add a **kwargs to see if there are any hidden params which were passed and need to be handled

DAGent Diagram

graph TD
    A[Function Node] --> B[Decision Node]
    B --> C[Function Node]
    B --> E[Function Node]
    D --> F[Function Node]
    E --> G[Decision Node]
    F --> H[Function Node]
    G --> K[Function Node]
    G -- "Pick Function to Run" --> I[Function Node]
    G --> J[Function Node]
    I --> L[Function Node]
    J --> M[Function Node]
    K --> N[Function Node]
    K -- "Run Both " --> S[Function Node]

    %% Additional annotations
    B -- "Use a Function as a tool" --> D[Function Node]

Using Different Models

DAGent supports using different LLM models for inference and tool description generation. You can specify the model when calling call_llm or call_llm_tool, or when compiling the DecisionNode.

For example, to use the groq/llama3-70b-8192 model:

# Using groq with decision node
decision_node1 = DecisionNode('groq/llama3-70b-8192')

# Using ollama with decision node
decision_node2 = DecisionNode('ollama_chat/llama3.1', api_base="http://localhost:11434")

# Call llm function
output = decision_node2.run(messages=[{'role': 'user', 'content': 'add the numbers 2 and 3'}])

Other things to know

prev_output is needed in the function signature if you want to use the value from the prior function's value. Obviously the prior function should have returned something for this to work
If there are errors with too many params being passed into a function node, add **kwargs to your function
Args can be overriden at any time using the following (this merges the kwargs in the background with priority to the user):

add_two_nums_node.user_params = {
    # param_name : value
    a : 10
}

Feedback

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Acknowledgements

Shoutout to:

Extensible-AI/DAGent