Testing generate args

Makefile

@@ -43,6 +43,7 @@ test:
 testcov: test
 	@echo "building coverage html"
 	@uv run coverage html --show-contexts
+	@uv run coverage report
 
 .PHONY: all
 all: format lint typecheck test

demos/parse_model.py

@@ -1,4 +1,3 @@
-from devtools import debug
 from pydantic import BaseModel
 
 from pydantic_ai import Agent
@@ -11,7 +10,6 @@ class MyModel(BaseModel):
 
 agent = Agent('openai:gpt-4o', response_type=MyModel, deps=None)
 
-# debug(agent.result_schema.json_schema)
 result = agent.run_sync('The windy city in the US of A.')
 
-debug(result.response)
+print(result.response)

pydantic_ai/_pydantic.py

@@ -107,7 +107,11 @@ def function_schema(either_function: _r.RetrieverEitherFunc[_r.AgentDeps, _r.P])
                 field_info,
                 decorators,
             )
-            td_schema['metadata'] = {'is_model_like': is_model_like(annotation)}
+            extra_metadata = {'is_model_like': is_model_like(annotation)}
+            if metadata := td_schema.get('metadata'):
+                metadata.update(extra_metadata)
+            else:
+                td_schema['metadata'] = extra_metadata
             if p.kind == Parameter.POSITIONAL_ONLY:
                 positional_fields.append(field_name)
             elif p.kind == Parameter.VAR_POSITIONAL:
@@ -130,6 +134,11 @@ def function_schema(either_function: _r.RetrieverEitherFunc[_r.AgentDeps, _r.P])
     # PluggableSchemaValidator is api compat with SchemaValidator
     schema_validator = cast(SchemaValidator, schema_validator)
     json_schema = GenerateJsonSchema().generate(schema)
+
+    # instead of passing `description` through in core_schema, we just add it here
+    if description:
+        json_schema = {'description': description} | json_schema
+
     return FunctionSchema(
         description=description,
         validator=schema_validator,

pydantic_ai/_utils.py

@@ -53,11 +53,16 @@ def is_model_like(type_: Any) -> bool:
     )
 
 
-class ObjectJsonSchema(TypedDict):
-    type: Literal['object']
-    title: str
-    properties: dict[str, JsonSchemaValue]
-    required: list[str]
+ObjectJsonSchema = TypedDict(
+    'ObjectJsonSchema',
+    {
+        'type': Literal['object'],
+        'title': str,
+        'properties': dict[str, JsonSchemaValue],
+        'required': list[str],
+        '$defs': dict[str, Any],
+    },
+)
 
 
 def check_object_json_schema(schema: JsonSchemaValue) -> ObjectJsonSchema:

pydantic_ai/agent.py

@@ -21,7 +21,7 @@ class Agent(Generic[AgentDeps, ResultData]):
     __slots__ = (
         '_model',
         'result_schema',
-        '_allow_plain_message',
+        '_allow_plain_response',
         '_system_prompts',
         '_retrievers',
         '_default_retries',
@@ -51,7 +51,7 @@ def __init__(
             response_schema_description,
             response_retries if response_retries is not None else retries,
         )
-        self._allow_plain_message = self.result_schema is None or self.result_schema.allow_plain_message
+        self._allow_plain_response = self.result_schema is None or self.result_schema.allow_plain_response
 
         self._system_prompts = (system_prompt,) if isinstance(system_prompt, str) else tuple(system_prompt)
         self._retrievers: dict[str, _r.Retriever[AgentDeps, Any]] = {r_.name: r_ for r_ in retrievers}
@@ -98,10 +98,10 @@ async def run(
 
         messages.append(_messages.UserPrompt(user_prompt))
 
-        functions: list[_models.AbstractRetrieverDefinition] = list(self._retrievers.values())
+        functions: list[_models.AbstractToolDefinition] = list(self._retrievers.values())
         if self.result_schema is not None:
             functions.append(self.result_schema)
-        agent_model = model_.agent_model(self._allow_plain_message, functions)
+        agent_model = model_.agent_model(self._allow_plain_response, functions)
 
         for retriever in self._retrievers.values():
             retriever.reset()
@@ -217,7 +217,7 @@ async def _handle_model_response(
         messages.append(llm_message)
         if llm_message.role == 'llm-response':
             # plain string response
-            if self._allow_plain_message:
+            if self._allow_plain_response:
                 return _utils.Some(cast(ResultData, llm_message.content))
             else:
                 messages.append(_messages.PlainResponseForbidden())

pydantic_ai/models/__init__.py

@@ -19,8 +19,13 @@ class Model(ABC):
     """Abstract class for a model."""
 
     @abstractmethod
-    def agent_model(self, allow_plain_message: bool, retrievers: list[AbstractRetrieverDefinition]) -> AgentModel:
-        """Create an agent model."""
+    def agent_model(self, allow_plain_response: bool, tools: list[AbstractToolDefinition]) -> AgentModel:
+        """Create an agent model.
+
+        Args:
+            allow_plain_response: Whether plain text final response is permitted.
+            tools: The tools available to the agent.
+        """
         raise NotImplementedError()
 
 
@@ -47,8 +52,11 @@ def infer_model(model: Model | KnownModelName) -> Model:
         raise TypeError(f'Invalid model: {model}')
 
 
-class AbstractRetrieverDefinition(Protocol):
-    """Abstract definition of a retriever/function/tool."""
+class AbstractToolDefinition(Protocol):
+    """Abstract definition of a function/tool.
+
+    These are generally retrievers, but can also include the response function if one exists.
+    """
 
     name: str
     description: str

pydantic_ai/models/function.py

@@ -4,20 +4,20 @@
 from typing import TYPE_CHECKING, Protocol
 
 from ..messages import LLMMessage, Message
-from . import AbstractRetrieverDefinition, AgentModel, Model
+from . import AbstractToolDefinition, AgentModel, Model
 
 if TYPE_CHECKING:
     from .._utils import ObjectJsonSchema
 
 
 class FunctionDef(Protocol):
     def __call__(
-        self, messages: list[Message], allow_plain_message: bool, retrievers: dict[str, RetrieverDescription], /
+        self, messages: list[Message], allow_plain_response: bool, tools: dict[str, ToolDescription], /
     ) -> LLMMessage: ...
 
 
 @dataclass
-class RetrieverDescription:
+class ToolDescription:
     name: str
     description: str
     json_schema: ObjectJsonSchema
@@ -30,19 +30,21 @@ class FunctionModel(Model):
 
     function: FunctionDef
 
-    def agent_model(self, allow_plain_message: bool, retrievers: list[AbstractRetrieverDefinition]) -> AgentModel:
-        return TestAgentModel(
+    def agent_model(self, allow_plain_response: bool, tools: list[AbstractToolDefinition]) -> AgentModel:
+        return FunctionAgentModel(
             self.function,
-            allow_plain_message,
-            {r.name: RetrieverDescription(r.name, r.description, r.json_schema) for r in retrievers},
+            allow_plain_response,
+            {r.name: ToolDescription(r.name, r.description, r.json_schema) for r in tools},
         )
 
 
 @dataclass
-class TestAgentModel(AgentModel):
+class FunctionAgentModel(AgentModel):
+    __test__ = False
+
     function: FunctionDef
-    allow_plain_message: bool
-    retrievers: dict[str, RetrieverDescription]
+    allow_plain_response: bool
+    tools: dict[str, ToolDescription]
 
     async def request(self, messages: list[Message]) -> LLMMessage:
-        return self.function(messages, self.allow_plain_message, self.retrievers)
+        return self.function(messages, self.allow_plain_response, self.tools)

pydantic_ai/models/openai.py

@@ -16,7 +16,7 @@
     LLMResponse,
     Message,
 )
-from . import AbstractRetrieverDefinition, AgentModel, Model
+from . import AbstractToolDefinition, AgentModel, Model
 
 
 class OpenAIModel(Model):
@@ -26,20 +26,20 @@ def __init__(self, model_name: ChatModel, *, api_key: str | None = None, client:
         self.model_name: ChatModel = model_name
         self.client = client or cached_async_client(api_key)
 
-    def agent_model(self, allow_plain_message: bool, retrievers: list[AbstractRetrieverDefinition]) -> AgentModel:
+    def agent_model(self, allow_plain_response: bool, tools: list[AbstractToolDefinition]) -> AgentModel:
         return OpenAIAgentModel(
             self.client,
             self.model_name,
-            allow_plain_message,
-            [map_retriever_definition(t) for t in retrievers],
+            allow_plain_response,
+            [map_tool_definition(t) for t in tools],
         )
 
 
 @dataclass
 class OpenAIAgentModel(AgentModel):
     client: AsyncClient
     model_name: ChatModel
-    allow_plain_message: bool
+    allow_plain_response: bool
     tools: list[ChatCompletionToolParam]
 
     async def request(self, messages: list[Message]) -> LLMMessage:
@@ -66,7 +66,7 @@ async def completions_create(self, messages: list[Message]) -> ChatCompletion:
         # standalone function to make it easier to override
         if not self.tools:
             tool_choice: Literal['none', 'required', 'auto'] = 'none'
-        elif not self.allow_plain_message:
+        elif not self.allow_plain_response:
             tool_choice = 'required'
         else:
             tool_choice = 'auto'
@@ -87,7 +87,7 @@ def cached_async_client(api_key: str) -> AsyncClient:
     return AsyncClient(api_key=api_key)
 
 
-def map_retriever_definition(f: AbstractRetrieverDefinition) -> ChatCompletionToolParam:
+def map_tool_definition(f: AbstractToolDefinition) -> ChatCompletionToolParam:
     return {
         'type': 'function',
         'function': {