Tool calling support. Part I

Add tool calling support for below providers -
OpenAI, Groq, Anthropic, AWS, & Mistral.
OpenAI compatible SDKs need to changes for
tool calling support.

Adding utility ToolManager for users to easily
supply tools, and parse model's request for
tool usage.

Author: rohitprasad15

aisuite/__init__.py

@@ -1 +1,2 @@
 from .client import Client
+from .framework.message import Message

aisuite/framework/__init__.py

@@ -1,2 +1,3 @@
 from .provider_interface import ProviderInterface
 from .chat_completion_response import ChatCompletionResponse
+from .message import Message

aisuite/framework/choice.py

@@ -1,6 +1,10 @@
 from aisuite.framework.message import Message
+from typing import Literal, Optional
 
 
 class Choice:
     def __init__(self):
-        self.message = Message()
+        self.finish_reason: Optional[Literal["stop", "tool_calls"]] = None
+        self.message = Message(
+            content=None, tool_calls=None, role="assistant", refusal=None
+        )

aisuite/framework/message.py

@@ -1,6 +1,22 @@
 """Interface to hold contents of api responses when they do not conform to the OpenAI style response"""
 
+from pydantic import BaseModel
+from typing import Literal, Optional
 
-class Message:
-    def __init__(self):
-        self.content = None
+
+class Function(BaseModel):
+    arguments: str
+    name: str
+
+
+class ChatCompletionMessageToolCall(BaseModel):
+    id: str
+    function: Function
+    type: Literal["function"]
+
+
+class Message(BaseModel):
+    content: Optional[str]
+    tool_calls: Optional[list[ChatCompletionMessageToolCall]]
+    role: Optional[Literal["user", "assistant", "system"]]
+    refusal: Optional[str]

aisuite/providers/anthropic_provider.py

@@ -1,12 +1,31 @@
 import anthropic
+import json
 from aisuite.provider import Provider
 from aisuite.framework import ChatCompletionResponse
+from aisuite.framework.message import Message, ChatCompletionMessageToolCall, Function
 
 # Define a constant for the default max_tokens value
 DEFAULT_MAX_TOKENS = 4096
 
+# Links:
+# Tool calling docs - https://docs.anthropic.com/en/docs/build-with-claude/tool-use
+
 
 class AnthropicProvider(Provider):
+    # Add these at the class level, after the class definition
+    FINISH_REASON_MAPPING = {
+        "end_turn": "stop",
+        "max_tokens": "length",
+        "tool_use": "tool_calls",
+        # Add more mappings as needed
+    }
+
+    # Role constants
+    ROLE_USER = "user"
+    ROLE_ASSISTANT = "assistant"
+    ROLE_TOOL = "tool"
+    ROLE_SYSTEM = "system"
+
     def __init__(self, **config):
         """
         Initialize the Anthropic provider with the given configuration.
@@ -15,26 +34,195 @@ def __init__(self, **config):
 
         self.client = anthropic.Anthropic(**config)
 
+    def convert_request(self, messages):
+        """Convert framework messages to Anthropic format."""
+        return [self._convert_single_message(msg) for msg in messages]
+
+    def _convert_single_message(self, msg):
+        """Convert a single message to Anthropic format."""
+        if isinstance(msg, dict):
+            return self._convert_dict_message(msg)
+        return self._convert_message_object(msg)
+
+    def _convert_dict_message(self, msg):
+        """Convert a dictionary message to Anthropic format."""
+        if msg["role"] == self.ROLE_TOOL:
+            return self._create_tool_result_message(msg["tool_call_id"], msg["content"])
+        elif msg["role"] == self.ROLE_ASSISTANT and "tool_calls" in msg:
+            return self._create_assistant_tool_message(
+                msg["content"], msg["tool_calls"]
+            )
+        return {"role": msg["role"], "content": msg["content"]}
+
+    def _convert_message_object(self, msg):
+        """Convert a Message object to Anthropic format."""
+        if msg.role == self.ROLE_TOOL:
+            return self._create_tool_result_message(msg.tool_call_id, msg.content)
+        elif msg.role == self.ROLE_ASSISTANT and msg.tool_calls:
+            return self._create_assistant_tool_message(msg.content, msg.tool_calls)
+        return {"role": msg.role, "content": msg.content}
+
+    def _create_tool_result_message(self, tool_call_id, content):
+        """Create a tool result message in Anthropic format."""
+        return {
+            "role": self.ROLE_USER,
+            "content": [
+                {
+                    "type": "tool_result",
+                    "tool_use_id": tool_call_id,
+                    "content": content,
+                }
+            ],
+        }
+
+    def _create_assistant_tool_message(self, content, tool_calls):
+        """Create an assistant message with tool calls in Anthropic format."""
+        message_content = []
+        if content:
+            message_content.append({"type": "text", "text": content})
+
+        for tool_call in tool_calls:
+            tool_input = (
+                tool_call["function"]["arguments"]
+                if isinstance(tool_call, dict)
+                else tool_call.function.arguments
+            )
+            message_content.append(
+                {
+                    "type": "tool_use",
+                    "id": (
+                        tool_call["id"] if isinstance(tool_call, dict) else tool_call.id
+                    ),
+                    "name": (
+                        tool_call["function"]["name"]
+                        if isinstance(tool_call, dict)
+                        else tool_call.function.name
+                    ),
+                    "input": json.loads(tool_input),
+                }
+            )
+
+        return {"role": self.ROLE_ASSISTANT, "content": message_content}
+
     def chat_completions_create(self, model, messages, **kwargs):
-        # Check if the fist message is a system message
-        if messages[0]["role"] == "system":
+        """Create a chat completion using the Anthropic API."""
+        system_message = self._extract_system_message(messages)
+        kwargs = self._prepare_kwargs(kwargs)
+        converted_messages = self.convert_request(messages)
+
+        response = self.client.messages.create(
+            model=model, system=system_message, messages=converted_messages, **kwargs
+        )
+        return self.convert_response(response)
+
+    def _extract_system_message(self, messages):
+        """Extract system message if present, otherwise return empty list."""
+        if messages and messages[0]["role"] == "system":
             system_message = messages[0]["content"]
-            messages = messages[1:]
-        else:
-            system_message = []
+            messages.pop(0)
+            return system_message
+        return []
 
-        # kwargs.setdefault('max_tokens', DEFAULT_MAX_TOKENS)
-        if "max_tokens" not in kwargs:
-            kwargs["max_tokens"] = DEFAULT_MAX_TOKENS
+    def _prepare_kwargs(self, kwargs):
+        """Prepare kwargs for the API call."""
+        kwargs = kwargs.copy()  # Create a copy to avoid modifying the original
+        kwargs.setdefault("max_tokens", DEFAULT_MAX_TOKENS)
 
-        return self.normalize_response(
-            self.client.messages.create(
-                model=model, system=system_message, messages=messages, **kwargs
-            )
+        if "tools" in kwargs:
+            kwargs["tools"] = self._convert_tool_spec(kwargs["tools"])
+
+        return kwargs
+
+    def convert_response_with_tool_use(self, response):
+        """Convert Anthropic tool use response to the framework's format."""
+        # Find the tool_use content
+        tool_call = next(
+            (content for content in response.content if content.type == "tool_use"),
+            None,
         )
 
-    def normalize_response(self, response):
+        if tool_call:
+            function = Function(
+                name=tool_call.name, arguments=json.dumps(tool_call.input)
+            )
+            tool_call_obj = ChatCompletionMessageToolCall(
+                id=tool_call.id, function=function, type="function"
+            )
+            # Get the text content if any
+            text_content = next(
+                (
+                    content.text
+                    for content in response.content
+                    if content.type == "text"
+                ),
+                "",
+            )
+
+            return Message(
+                content=text_content or None,
+                tool_calls=[tool_call_obj] if tool_call else None,
+                role="assistant",
+                refusal=None,
+            )
+        return None
+
+    def convert_response(self, response):
         """Normalize the response from the Anthropic API to match OpenAI's response format."""
         normalized_response = ChatCompletionResponse()
-        normalized_response.choices[0].message.content = response.content[0].text
+
+        normalized_response.choices[0].finish_reason = self._get_finish_reason(response)
+        normalized_response.usage = self._get_usage_stats(response)
+        normalized_response.choices[0].message = self._get_message(response)
+
         return normalized_response
+
+    def _get_finish_reason(self, response):
+        """Get the normalized finish reason."""
+        return self.FINISH_REASON_MAPPING.get(response.stop_reason, "stop")
+
+    def _get_usage_stats(self, response):
+        """Get the usage statistics."""
+        return {
+            "prompt_tokens": response.usage.input_tokens,
+            "completion_tokens": response.usage.output_tokens,
+            "total_tokens": response.usage.input_tokens + response.usage.output_tokens,
+        }
+
+    def _get_message(self, response):
+        """Get the appropriate message based on response type."""
+        if response.stop_reason == "tool_use":
+            tool_message = self.convert_response_with_tool_use(response)
+            if tool_message:
+                return tool_message
+
+        return Message(
+            content=response.content[0].text,
+            role="assistant",
+            tool_calls=None,
+            refusal=None,
+        )
+
+    def _convert_tool_spec(self, openai_tools):
+        """Convert OpenAI tool specification to Anthropic format."""
+        anthropic_tools = []
+
+        for tool in openai_tools:
+            # Only handle function-type tools from OpenAI
+            if tool.get("type") != "function":
+                continue
+
+            function = tool["function"]
+
+            anthropic_tool = {
+                "name": function["name"],
+                "description": function["description"],
+                "input_schema": {
+                    "type": "object",
+                    "properties": function["parameters"]["properties"],
+                    "required": function["parameters"].get("required", []),
+                },
+            }
+
+            anthropic_tools.append(anthropic_tool)
+
+        return anthropic_tools