Agent Tool Protocol(ATP)

A Python SDK for registering, exposing, and serving your own Python functions as tools via the ATP platform. Supports secure OAuth2 flows, dynamic tool registration, and real-time tool invocation via WebSocket.

Table of Contents

• Installation
• Quick Start
• Class: ToolKitClient
  • Constructor
  • register_tool
  • start
  • stop
• Tool Function Requirements
• WebSocket Events
• Error Handling
• Examples
• Advanced Usage
• License

Installation

pip install AgentToolProtocol

Quick Start

from atp_sdk.clients import ToolKitClient
import requests

client = ToolKitClient(
    api_key="YOUR_ATP_TOOLKIT_API_KEY",
    app_name="my_app"
)

@client.register_tool(
    function_name="hello_world",
    params=['name'],
    required_params=['name'],
    description="Returns a greeting.",
    auth_provider=None, auth_type=None, auth_with=None
)
def hello_world(**kwargs):
    return {"message": f"Hello, {kwargs.get('name', 'World')}!"}

client.start()

Class: ToolKitClient

Constructor

ToolKitClient(
    api_key: str,
    app_name: str,
    base_url: str = "https://api.chat-atp.com"
)

Parameters:

• api_key (str): Your ATP Toolkit API key.
• app_name (str): Name of your application.
• base_url (str, optional): ATP Server backend URL. Defaults to api.chat-atp.com.

register_tool

Registers a Python function as a tool with the ATP platform.

@client.register_tool(
    function_name: str,
    params: list[str],
    required_params: list[str],
    description: str,
    auth_provider: Optional[str],
    auth_type: Optional[str],
    auth_with: Optional[str]
)
def my_tool(**kwargs):
    ...

Arguments:

• function_name: Unique name for the tool.
• params: List of all parameter names.
• required_params: List of required parameter names.
• description: Human-readable description.
• auth_provider: Name of OAuth2 provider (e.g., "hubspot", "google"), or None.
• auth_type: Auth type (e.g., "OAuth2", "apiKey"), or None.
• auth_with: Name of the token parameter (e.g., "access_token", "api_key"), or None.

Returns:
A decorator to wrap your function.

Example:

@client.register_tool(
    function_name="create_company",
    params=['name', 'domain', 'industry'],
    required_params=['name', 'domain', 'industry'],
    description="Creates a company in HubSpot.",
    auth_provider="hubspot", auth_type="OAuth2", auth_with="access_token"
)
def create_company(**kwargs):
    access_token = kwargs.get('auth_token')
    url = "https://api.hubapi.com/crm/v3/objects/companies"
    headers = {"Authorization": f"Bearer {access_token}", "Content-Type": "application/json"}
    data = {"properties": {
        "name": kwargs.get('name'),
        "domain": kwargs.get('domain'),
        "industry": kwargs.get('industry')
    }}
    response = requests.post(url, json=data, headers=headers)
    return response.json()

start

Starts the WebSocket client and begins listening for tool requests.

client.start()

• Keeps the main thread alive.
• Handles reconnections automatically.

stop

Stops the WebSocket client and closes the connection.

client.stop()

Tool Function Requirements

• Must accept all parameters as **kwargs.
• If your tool requires authentication, expect auth_token in kwargs.
• Return a serializable object (dict, str, etc).

WebSocket Events

Tool Registration

Upon registration, your tool is announced to the ATP backend and available for invocation.

Tool Invocation

When a tool request is received, your function is called with the provided parameters and (if needed) auth_token.

Example incoming message:

{
  "message_type": "atp_tool_request",
  "payload": {
    "request_id": "uuid",
    "tool_name": "create_company",
    "params": {"name": "Acme", "domain": "acme.com", "industry": "Tech"},
    "auth_token": "ACCESS_TOKEN"
  }
}

Error Handling

• If your function raises an exception, the error is caught and returned as:

  {"error": "Error message"}
  

• If required parameters are missing, an error is returned.
• If auth_token is required but missing, an error is returned.

Examples

Minimal Tool

@client.register_tool(
    function_name="echo",
    params=['text'],
    required_params=['text'],
    description="Echoes the input text.",
    auth_provider=None, auth_type=None, auth_with=None
)
def echo(**kwargs):
    return {"echo": kwargs.get('text')}

Tool with OAuth2

@client.register_tool(
    function_name="get_contacts",
    params=[],
    required_params=[],
    description="Fetches contacts from HubSpot.",
    auth_provider="hubspot", auth_type="OAuth2", auth_with="access_token"
)
def get_contacts(**kwargs):
    access_token = kwargs.get('auth_token')
    url = "https://api.hubapi.com/crm/v3/objects/contacts"
    headers = {"Authorization": f"Bearer {access_token}"}
    response = requests.get(url, headers=headers)
    return response.json()

Tool with API Key

@client.register_tool(
    function_name="get_contacts",
    params=[],
    required_params=[],
    description="Fetches contacts from HubSpot.",
    auth_provider="hubspot", auth_type="apiKey", auth_with="api_key"
)
def get_contacts(**kwargs):
    access_token = kwargs.get('auth_token')
    url = "https://api.hubapi.com/crm/v3/objects/contacts"
    headers = {"Authorization": f"Bearer {access_token}"}
    response = requests.get(url, headers=headers)
    return response.json()

Class: LLMClient

The LLMClient lets you connect to the ATP Agent Server, retrieve toolkit context, and execute tools or workflows using JSON payloads—perfect for LLM-based agents.

Constructor

from atp_sdk.clients import LLMClient

llm_client = LLMClient(
    api_key="YOUR_ATP_LLM_CLIENT_API_KEY",
    protocol="ws",  # or "http"
    base_url="https://api.chat-atp.com/ws/v1/atp/llm-client/"
)

Parameters:

• api_key (str): Your ATP API key.
• protocol (str, optional): Protocol to use ("ws" or "http"). Defaults to "ws".
• base_url (str, optional): ATP server URL. Defaults to https://api.chat-atp.com/ws/v1/atp/llm-client/.

get_toolkit_context

Retrieves the toolkit context and system instructions for a given toolkit and user prompt.

context = llm_client.get_toolkit_context(
    toolkit_id="your_toolkit_id",
    provider="openai",  # or "anthropic" or "mistralai"
    user_prompt="What do you want to achieve?"
)

Returns: A dictionary containing the toolkit context, including provider-specific tool schemas.

call_tool

Executes a tool or workflow on the ATP server.

response = llm_client.call_tool(
    toolkit_id="your_toolkit_id",
    tool_calls='{"function": "hello_world", "parameters": {"name": "Alice"}}',
    provider="openai",  # or "anthropic" or "mistralai"
    user_prompt="Say hello to Alice."
)
print(response)

Arguments:

• toolkit_id: Unique ID of the toolkit.
• tool_calls: JSON payload from an LLM containing the tool call.
• provider: The LLM provider (e.g., "openai", "anthropic", "mistralai").
• user_prompt: Additional user input to include in the execution.

OAuth2 Integration & Token Handling

The ATP SDK supports secure OAuth2 flows for tools that require third-party authentication (e.g., HubSpot, Google, Salesforce).

How it works:

• Use LLMClient.initiate_oauth_connection() to start the OAuth flow and get an authorization URL for the user.
• Use LLMClient.wait_for_connection() to poll for completion and retrieve the integration ID.
• Use LLMClient.get_user_tokens() to fetch the user's access and refresh tokens for use in tool calls.

Example:

from atp_sdk.clients import LLMClient

llm_client = LLMClient(api_key="YOUR_ATP_LLM_CLIENT_API_KEY")

# Step 1: Initiate OAuth connection
connection = llm_client.initiate_oauth_connection(
    platform_id="PLATFORM_ID",
    external_user_id="user@example.com",
    developer_redirect_url="https://your-app.com/oauth/callback"
)
print("Authorize at:", connection["authorization_url"])

# Step 2: Wait for connection
account = llm_client.wait_for_connection(
    platform_id="PLATFORM_ID",
    external_user_id="user@example.com"
)
print("Integration ID:", account["integration_id"])

# Step 3: Fetch tokens
tokens = llm_client.get_user_tokens(
    platform_id="PLATFORM_ID",
    external_user_id="user@example.com"
)
print("Access token:", tokens["access_token"])

Note:

• You only need to handle OAuth and fetch tokens; the SDK will automatically inject tokens into tool calls as needed.
• See the LLMClient section for more details.

Request/Response Flow

1. LLM Requests Toolkit Context

• The LLM (OpenAI, Anthropic, or Mistral) sends a request to the ATP server to get the toolkit context.
• The ATP server responds with a list of available tools and their schemas.

Request:

{
  "type": "get_toolkit_context",
  "toolkit_id": "your_toolkit_id",
  "request_id": "uuid",
  "provider": "openai",
  "user_prompt": "What do you want to achieve?"
}

Response:

{
  "type": "toolkit_context",
  "request_id": "uuid",
  "payload": {
    "toolkit_id": "your_toolkit_id",
    "toolkit_name": "Example Toolkit",
    "caption": "Example Caption",
    "provider": "openai",
    "tools": [
      {
        "type": "function",
        "name": "hello_world",
        "description": "Returns a greeting.",
        "parameters": {
          "type": "object",
          "properties": {
            "name": {"type": "string", "description": "Name to greet"}
          },
          "required": ["name"]
        }
      }
    ],
    "user_prompt": "What do you want to achieve?"
  }
}

2. LLM Generates Tool Calls

• The LLM uses the toolkit context to generate tool calls.
• The LLM sends the tool calls to the ATP server for execution.

Request:

{
  "type": "task_request",
  "toolkit_id": "your_toolkit_id",
  "request_id": "uuid",
  "payload": {
    "function": "hello_world",
    "parameters": {"name": "Alice"}
  },
  "provider": "openai",
  "user_prompt": "Say hello to Alice."
}

3. ATP Server Executes Tool

• The ATP server receives the tool call and executes the corresponding tool.
• The ATP server sends the tool's response back to the LLM.

Response:

{
  "type": "task_response",
  "request_id": "uuid",
  "payload": {
    "result": {"message": "Hello, Alice!"}
  }
}

Using LLMClient with OpenAI, Anthropic, and Mistral AI

OpenAI

import openai
from atp_sdk.clients import LLMClient

openai_client = openai.OpenAI(api_key="YOUR_OPENAI_API_KEY")
llm_client = LLMClient(api_key="YOUR_ATP_LLM_CLIENT_API_KEY")

# Get toolkit context
context = llm_client.get_toolkit_context(
    toolkit_id="your_toolkit_id",
    provider="openai",
    user_prompt="Create a company and then list contacts."
)

# Use OpenAI to generate tool calls
response = openai_client.chat.completions.create(
    model="gpt-4o",
    messages=[
        {"role": "system", "content": "You are a helpful assistant."},
        {"role": "user", "content": "Create a company and then list contacts."}
    ],
    tools=context["tools"],
    tool_choice="auto"
)

# Extract tool calls
tool_calls = response.choices[0].message.tool_calls


if tool_calls:

    result = llm_client.call_tool(
        toolkit_id="your_toolkit_id",
        tool_calls=tool_calls,
        provider="openai",
        user_prompt="Create a company and then list contacts."
    )

    print(f"Tool call result: {result}")

Anthropic

import anthropic
from atp_sdk.clients import LLMClient

anthropic_client = anthropic.Anthropic(api_key="YOUR_ANTHROPIC_API_KEY")
llm_client = LLMClient(api_key="YOUR_ATP_LLM_CLIENT_API_KEY")

# Get toolkit context
context = llm_client.get_toolkit_context(
    toolkit_id="your_toolkit_id",
    provider="anthropic",
    user_prompt="Create a company and then list contacts."
)

# Use Anthropic to generate tool calls
response = anthropic_client.messages.create(
    model="claude-3-opus-20240229",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Create a company and then list contacts."}
    ],
    tools=context["tools"]
)

# Extract tool calls
tool_calls = response.content

# Loop through tool calls and execute each one
for tool_call in tool_calls:
    tool_call_json = {
        "function": tool_call.name,
        "parameters": tool_call.input
    }

    result = llm_client.call_tool(
        toolkit_id="your_toolkit_id",
        tool_calls=tool_call_json,
        provider="anthropic",
        user_prompt="Create a company and then list contacts."
    )

    print(f"Tool call result: {result}")

Mistral AI

from mistralai.client import MistralClient
from atp_sdk.clients import LLMClient

mistral_client = MistralClient(api_key="YOUR_MISTRAL_API_KEY")
llm_client = LLMClient(api_key="YOUR_ATP_LLM_CLIENT_API_KEY")

# Get toolkit context
context = llm_client.get_toolkit_context(
    toolkit_id="your_toolkit_id",
    provider="mistralai",
    user_prompt="Create a company and then list contacts."
)

# Use Mistral to generate tool calls
response = mistral_client.chat(
    model="mistral-large-latest",
    messages=[{"role": "user", "content": "Create a company and then list contacts."}],
    tools=context["tools"]
)

# Extract tool calls
tool_calls = response.choices[0].message.tool_calls

# Loop through tool calls and execute each one
if tool_calls:

    result = llm_client.call_tool(
        toolkit_id="your_toolkit_id",
        tool_calls=tool_calls,
        provider="mistralai",
        user_prompt="Create a company and then list contacts."
    )

    print(f"Tool call result: {result}")

Handling Multi-Step Tool Calls

When the LLM generates multiple tool calls, loop through them and execute each one sequentially:

# Loop through tool calls and execute each one
for tool_call in tool_calls:

    result = llm_client.call_tool(
        toolkit_id="your_toolkit_id",
        tool_calls=[tool_call],
        provider="openai",  # or "anthropic" or "mistralai"
        user_prompt="Create a company and then list contacts."
    )

    print(f"Tool call result: {result}")

Advanced Usage

Custom Backend

client = ToolKitClient(
    api_key="YOUR_API_KEY",
    app_name="my_app",
    base_url="https://your-backend.example.com"
)

Multiple Tools

@client.register_tool(...)
def tool1(**kwargs): ...

@client.register_tool(...)
def tool2(**kwargs): ...

Framework Integration: Django, FastAPI, and Flask

Django

How to use:

1. Install:
   pip install AgentToolProtocol django
2. Add "django_atp" to INSTALLED_APPS in your settings.py.
3. Include path("", include("django_atp.urls")) in your project urls.py.
4. Register your toolkits and tools in a module in your app (e.g. myapp/atp_tools.py), and import this module in your app’s apps.py ready() method to ensure registration at startup:

   # myapp/apps.py
   from django.apps import AppConfig
   class MyAppConfig(AppConfig):
       name = "myapp"
       def ready(self):
           import myapp.atp_tools
   

5. Each registered tool is exposed at /atp/<toolkit_name>/<tool_name>/ (GET for context, POST payload of parameters for execution).
6. Visit /atp/<toolkit_name>/ for toolkit details and a list of tools.

FastAPI

How to use:

1. Install:
   pip install AgentToolProtocol fastapi uvicorn

2. Register your toolkits and tools in a module (e.g. atp_tools.py), and import it in your FastAPI app before starting.

3. Example endpoints:

   from fastapi import FastAPI, Request
   from fastapi.responses import JSONResponse
   from fastapi_atp.registry import get_client
   import atp_tools  # Ensure toolkit registration
   
   app = FastAPI()
   
   @app.get("/atp/{toolkit_name}/{tool_name}/")
   async def get_tool(toolkit_name: str, tool_name: str):
       client = get_client(toolkit_name)
       if not client:
           return JSONResponse({"error": "Toolkit not found"}, status_code=404)
       tool = client.registered_tools.get(tool_name)
       if not tool:
           return JSONResponse({"error": "Tool not found"}, status_code=404)
       return JSONResponse(tool)
   
   @app.post("/atp/{toolkit_name}/{tool_name}/")
   async def post_tool(toolkit_name: str, tool_name: str, request: Request):
       client = get_client(toolkit_name)
       if not client:
           return JSONResponse({"error": "Toolkit not found"}, status_code=404)
       tool = client.registered_tools.get(tool_name)
       if not tool:
           return JSONResponse({"error": "Tool not found"}, status_code=404)
       params = await request.json()
       result = tool["function"](**params)
       return JSONResponse({"result": result})
   
   @app.get("/atp/{toolkit_name}/")
   async def get_toolkit(toolkit_name: str):
       client = get_client(toolkit_name)
       if not client:
           return JSONResponse({"error": "Toolkit not found"}, status_code=404)
       tools = list(client.registered_tools.keys())
       return JSONResponse({"toolkit": toolkit_name, "tools": tools})
   

4. Run your fastAPI app with:
   uvicorn your_app_module:app --reload

5. Visit /atp/<toolkit_name>/ for toolkit details and a list of tools.

6. Visit /atp/<toolkit_name>/<tool_name>/ for tool details.

Flask

How to use:

1. Install:
   pip install AgentToolProtocol flask

2. Register your toolkits and tools in a module (e.g. atp_tools.py), and import it in your Flask app before starting.

3. Example endpoints:

   from flask import Flask, request, jsonify
   from django_atp.registry import get_client
   import atp_tools  # Ensure toolkit registration
   
   app = Flask(__name__)
   
   @app.route("/atp/<toolkit_name>/<tool_name>/", methods=["GET", "POST"])
   def tool_endpoint(toolkit_name, tool_name):
       client = get_client(toolkit_name)
       if not client:
           return jsonify({"error": "Toolkit not found"}), 404
       tool = client.registered_tools.get(tool_name)
       if not tool:
           return jsonify({"error": "Tool not found"}), 404
       if request.method == "GET":
           return jsonify(tool)
       params = request.json if request.is_json else request.form.to_dict()
       result = tool["function"](**params)
       return jsonify({"result": result})
   
   @app.route("/atp/<toolkit_name>/", methods=["GET"])
   def toolkit_endpoint(toolkit_name):
       client = get_client(toolkit_name)
       if not client:
           return jsonify({"error": "Toolkit not found"}), 404
       tools = list(client.registered_tools.keys())
       return jsonify({"toolkit": toolkit_name, "tools": tools})
   
   if __name__ == "__main__":
       app.run(debug=True)
   

4. Run your Flask app with:
   python your_flask_app.py

5. Visit /atp/<toolkit_name>/ for toolkit details and a list of tools.

6. Visit /atp/<toolkit_name>/<tool_name>/ for tool details.

Example atp_tools.py for Flask/FastAPI/Django

from atp_sdk.clients import ToolKitClient
from django_atp.registry import register_client  # For Django
from fastapi_atp.registry import register_client  # For FastAPI
from flask_atp.registry import register_client  # For Flask

# Initialize the client
client = ToolKitClient(
    api_key="YOUR_ATP_API_TOOLKIT_KEY",
    app_name="<your_toolkit_name>"
)

# Register the client (Django/FastAPI/Flask)
register_client("<your_toolkit_name>", client)

# Define and register tools the usual way but this time no need to call start() at the end of the file
@client.register_tool(
    function_name="hello_world",
    params=['name'],
    required_params=['name'],
    description="Returns a greeting.",
    auth_provider=None, auth_type=None, auth_with=None
)
def hello_world(name):
    return f"Hello, {name}!"

License

MIT License.
See LICENSE for details.

Feedback & Issues

For bug reports or feature requests, please open an issue on GitHub.

Happy coding! 🚀