Misc small fixes - mcp version, test for function_schema, version gen (openai#429)

Summary:
1. Use <2 for MCP version so it doesn't break if the MCP sdk upgrades.
2. Test the func schema extraction logic.
3. Fix the logic to get the version nuber of the framework

Test Plan:
unit tests

Author: rm-openai

Diff for: .vscode/settings.json

@@ -0,0 +1,7 @@
+{
+    "python.testing.pytestArgs": [
+        "tests"
+    ],
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true
+}

Diff for: pyproject.toml

@@ -13,7 +13,7 @@ dependencies = [
     "typing-extensions>=4.12.2, <5",
     "requests>=2.0, <3",
     "types-requests>=2.0, <3",
-    "mcp; python_version >= '3.10'",
+    "mcp>=1.6.0, <2; python_version >= '3.10'",
 ]
 classifiers = [
     "Typing :: Typed",

Diff for: src/agents/__init__.py

@@ -100,6 +100,7 @@
     transcription_span,
 )
 from .usage import Usage
+from .version import __version__
 
 
 def set_default_openai_key(key: str, use_for_tracing: bool = True) -> None:
@@ -247,4 +248,5 @@ def enable_verbose_stdout_logging():
     "gen_trace_id",
     "gen_span_id",
     "default_tool_error_function",
+    "__version__",
 ]

Diff for: src/agents/version.py

@@ -1,7 +1,7 @@
 import importlib.metadata
 
 try:
-    __version__ = importlib.metadata.version("agents")
+    __version__ = importlib.metadata.version("openai-agents")
 except importlib.metadata.PackageNotFoundError:
     # Fallback if running from source without being installed
     __version__ = "0.0.0"

Diff for: tests/test_function_tool_decorator.py

@@ -3,6 +3,7 @@
 from typing import Any, Optional
 
 import pytest
+from inline_snapshot import snapshot
 
 from agents import function_tool
 from agents.run_context import RunContextWrapper
@@ -198,3 +199,37 @@ async def test_all_optional_params_function():
     input_data = {"x": 10, "y": "world", "z": 99}
     output = await tool.on_invoke_tool(ctx_wrapper(), json.dumps(input_data))
     assert output == "10_world_99"
+
+
+@function_tool
+def get_weather(city: str) -> str:
+    """Get the weather for a given city.
+
+    Args:
+        city: The city to get the weather for.
+    """
+    return f"The weather in {city} is sunny."
+
+
+@pytest.mark.asyncio
+async def test_extract_descriptions_from_docstring():
+    """Ensure that we extract function and param descriptions from docstrings."""
+
+    tool = get_weather
+    assert tool.description == "Get the weather for a given city."
+    params_json_schema = tool.params_json_schema
+    assert params_json_schema == snapshot(
+        {
+            "type": "object",
+            "properties": {
+                "city": {
+                    "description": "The city to get the weather for.",
+                    "title": "City",
+                    "type": "string",
+                }
+            },
+            "title": "get_weather_args",
+            "required": ["city"],
+            "additionalProperties": False,
+        }
+    )