Merge branch 'main' into fix/windows_stdio_subprocess

Author: theailanguage

README.md

@@ -402,6 +402,9 @@ mcp = FastMCP("StatefulServer")
 # Stateless server (no session persistence)
 mcp = FastMCP("StatelessServer", stateless_http=True)
 
+# Stateless server (no session persistence, no sse stream with supported client)
+mcp = FastMCP("StatelessServer", stateless_http=True, json_response=True)
+
 # Run server with streamable_http transport
 mcp.run(transport="streamable-http")
 ```
@@ -434,15 +437,22 @@ def add_two(n: int) -> int:
 
 ```python
 # main.py
+import contextlib
 from fastapi import FastAPI
 from mcp.echo import echo
 from mcp.math import math
 
 
-app = FastAPI()
+# Create a combined lifespan to manage both session managers
+@contextlib.asynccontextmanager
+async def lifespan(app: FastAPI):
+    async with contextlib.AsyncExitStack() as stack:
+        await stack.enter_async_context(echo.mcp.session_manager.run())
+        await stack.enter_async_context(math.mcp.session_manager.run())
+        yield
+
 
-# Use the session manager's lifespan
-app = FastAPI(lifespan=lambda app: echo.mcp.session_manager.run())
+app = FastAPI(lifespan=lifespan)
 app.mount("/echo", echo.mcp.streamable_http_app())
 app.mount("/math", math.mcp.streamable_http_app())
 ```

examples/servers/simple-auth/mcp_simple_auth/__main__.py

@@ -4,4 +4,4 @@
 
 from mcp_simple_auth.server import main
 
-sys.exit(main())
+sys.exit(main())  # type: ignore[call-arg]

examples/servers/simple-prompt/mcp_simple_prompt/__main__.py

@@ -2,4 +2,4 @@
 
 from .server import main
 
-sys.exit(main())
+sys.exit(main())  # type: ignore[call-arg]

examples/servers/simple-resource/mcp_simple_resource/__main__.py

@@ -2,4 +2,4 @@
 
 from .server import main
 
-sys.exit(main())
+sys.exit(main())  # type: ignore[call-arg]

examples/servers/simple-resource/mcp_simple_resource/server.py

@@ -2,7 +2,7 @@
 import click
 import mcp.types as types
 from mcp.server.lowlevel import Server
-from pydantic import FileUrl
+from pydantic import AnyUrl
 
 SAMPLE_RESOURCES = {
     "greeting": "Hello! This is a sample text resource.",
@@ -26,7 +26,7 @@ def main(port: int, transport: str) -> int:
     async def list_resources() -> list[types.Resource]:
         return [
             types.Resource(
-                uri=FileUrl(f"file:///{name}.txt"),
+                uri=AnyUrl(f"file:///{name}.txt"),
                 name=name,
                 description=f"A sample text resource named {name}",
                 mimeType="text/plain",
@@ -35,7 +35,9 @@ async def list_resources() -> list[types.Resource]:
         ]
 
     @app.read_resource()
-    async def read_resource(uri: FileUrl) -> str | bytes:
+    async def read_resource(uri: AnyUrl) -> str | bytes:
+        if uri.path is None:
+            raise ValueError(f"Invalid resource path: {uri}")
         name = uri.path.replace(".txt", "").lstrip("/")
 
         if name not in SAMPLE_RESOURCES:

examples/servers/simple-streamablehttp-stateless/mcp_simple_streamablehttp_stateless/__main__.py

@@ -1,4 +1,7 @@
 from .server import main
 
 if __name__ == "__main__":
-    main()
+    # Click will handle CLI arguments
+    import sys
+
+    sys.exit(main())  # type: ignore[call-arg]

examples/servers/simple-streamablehttp/mcp_simple_streamablehttp/__main__.py

@@ -1,4 +1,4 @@
 from .server import main
 
 if __name__ == "__main__":
-    main()
+    main()  # type: ignore[call-arg]

examples/servers/simple-tool/mcp_simple_tool/__main__.py

@@ -2,4 +2,4 @@
 
 from .server import main
 
-sys.exit(main())
+sys.exit(main())  # type: ignore[call-arg]

pyproject.toml

@@ -85,7 +85,7 @@ Issues = "https://github.com/modelcontextprotocol/python-sdk/issues"
 packages = ["src/mcp"]
 
 [tool.pyright]
-include = ["src/mcp", "tests"]
+include = ["src/mcp", "tests", "examples/servers"]
 venvPath = "."
 venv = ".venv"
 strict = ["src/mcp/**/*.py"]

src/mcp/client/session.py

@@ -8,7 +8,7 @@
 import mcp.types as types
 from mcp.shared.context import RequestContext
 from mcp.shared.message import SessionMessage
-from mcp.shared.session import BaseSession, RequestResponder
+from mcp.shared.session import BaseSession, ProgressFnT, RequestResponder
 from mcp.shared.version import SUPPORTED_PROTOCOL_VERSIONS
 
 DEFAULT_CLIENT_INFO = types.Implementation(name="mcp", version="0.1.0")
@@ -201,23 +201,29 @@ async def set_logging_level(self, level: types.LoggingLevel) -> types.EmptyResul
             types.EmptyResult,
         )
 
-    async def list_resources(self) -> types.ListResourcesResult:
+    async def list_resources(
+        self, cursor: str | None = None
+    ) -> types.ListResourcesResult:
         """Send a resources/list request."""
         return await self.send_request(
             types.ClientRequest(
                 types.ListResourcesRequest(
                     method="resources/list",
+                    cursor=cursor,
                 )
             ),
             types.ListResourcesResult,
         )
 
-    async def list_resource_templates(self) -> types.ListResourceTemplatesResult:
+    async def list_resource_templates(
+        self, cursor: str | None = None
+    ) -> types.ListResourceTemplatesResult:
         """Send a resources/templates/list request."""
         return await self.send_request(
             types.ClientRequest(
                 types.ListResourceTemplatesRequest(
                     method="resources/templates/list",
+                    cursor=cursor,
                 )
             ),
             types.ListResourceTemplatesResult,
@@ -264,26 +270,32 @@ async def call_tool(
         name: str,
         arguments: dict[str, Any] | None = None,
         read_timeout_seconds: timedelta | None = None,
+        progress_callback: ProgressFnT | None = None,
     ) -> types.CallToolResult:
-        """Send a tools/call request."""
+        """Send a tools/call request with optional progress callback support."""
 
         return await self.send_request(
             types.ClientRequest(
                 types.CallToolRequest(
                     method="tools/call",
-                    params=types.CallToolRequestParams(name=name, arguments=arguments),
+                    params=types.CallToolRequestParams(
+                        name=name,
+                        arguments=arguments,
+                    ),
                 )
             ),
             types.CallToolResult,
             request_read_timeout_seconds=read_timeout_seconds,
+            progress_callback=progress_callback,
         )
 
-    async def list_prompts(self) -> types.ListPromptsResult:
+    async def list_prompts(self, cursor: str | None = None) -> types.ListPromptsResult:
         """Send a prompts/list request."""
         return await self.send_request(
             types.ClientRequest(
                 types.ListPromptsRequest(
                     method="prompts/list",
+                    cursor=cursor,
                 )
             ),
             types.ListPromptsResult,
@@ -322,12 +334,13 @@ async def complete(
             types.CompleteResult,
         )
 
-    async def list_tools(self) -> types.ListToolsResult:
+    async def list_tools(self, cursor: str | None = None) -> types.ListToolsResult:
         """Send a tools/list request."""
         return await self.send_request(
             types.ClientRequest(
                 types.ListToolsRequest(
                     method="tools/list",
+                    cursor=cursor,
                 )
             ),
             types.ListToolsResult,