chore: bump ruff (#1085)

examples/clients/simple-auth-client/mcp_simple_auth_client/main.py

@@ -81,7 +81,7 @@ class CallbackHandler(BaseHTTPRequestHandler):
             <html>
             <body>
                 <h1>Authorization Failed</h1>
-                <p>Error: {query_params['error'][0]}</p>
+                <p>Error: {query_params["error"][0]}</p>
                 <p>You can close this window and return to the terminal.</p>
             </body>
             </html>

examples/fastmcp/memory.py

@@ -16,7 +16,7 @@ import os
 from dataclasses import dataclass
 from datetime import datetime, timezone
 from pathlib import Path
-from typing import Annotated, Self
+from typing import Annotated, Self, TypeVar
 
 import asyncpg
 import numpy as np
@@ -35,6 +35,8 @@ REINFORCEMENT_FACTOR = 1.1
 DEFAULT_LLM_MODEL = "openai:gpt-4o"
 DEFAULT_EMBEDDING_MODEL = "text-embedding-3-small"
 
+T = TypeVar("T")
+
 mcp = FastMCP(
     "memory",
     dependencies=[
@@ -57,7 +59,7 @@ def cosine_similarity(a: list[float], b: list[float]) -> float:
     return np.dot(a_array, b_array) / (np.linalg.norm(a_array) * np.linalg.norm(b_array))
 
 
-async def do_ai[T](
+async def do_ai(
     user_prompt: str,
     system_prompt: str,
     result_type: type[T] | Annotated,

examples/fastmcp/unicode_example.py

@@ -8,7 +8,7 @@ from mcp.server.fastmcp import FastMCP
 mcp = FastMCP()
 
 
-@mcp.tool(description="🌟 A tool that uses various Unicode characters in its description: " "á é í ó ú ñ 漢字 🎉")
+@mcp.tool(description="🌟 A tool that uses various Unicode characters in its description: á é í ó ú ñ 漢字 🎉")
 def hello_unicode(name: str = "世界", greeting: str = "¡Hola") -> str:
     """
     A simple tool that demonstrates Unicode handling in:

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

@@ -89,7 +89,7 @@ class SimpleOAuthProvider(OAuthAuthorizationServerProvider):
         }
 
         # Build simple login URL that points to login page
-        auth_url = f"{self.auth_callback_url}" f"?state={state}" f"&client_id={client.client_id}"
+        auth_url = f"{self.auth_callback_url}?state={state}&client_id={client.client_id}"
 
         return auth_url
 
@@ -117,7 +117,7 @@ class SimpleOAuthProvider(OAuthAuthorizationServerProvider):
             <p><strong>Username:</strong> demo_user<br>
             <strong>Password:</strong> demo_password</p>
             
-            <form action="{self.server_url.rstrip('/')}/login/callback" method="post">
+            <form action="{self.server_url.rstrip("/")}/login/callback" method="post">
                 <input type="hidden" name="state" value="{state}">
                 <div class="form-group">
                     <label>Username:</label>

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

@@ -51,7 +51,7 @@ def main(
         for i in range(count):
             await ctx.session.send_log_message(
                 level="info",
-                data=f"Notification {i+1}/{count} from caller: {caller}",
+                data=f"Notification {i + 1}/{count} from caller: {caller}",
                 logger="notification_stream",
                 related_request_id=ctx.request_id,
             )

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

@@ -55,7 +55,7 @@ def main(
         for i in range(count):
             # Include more detailed message for resumability demonstration
             notification_msg = (
-                f"[{i+1}/{count}] Event from '{caller}' - "
+                f"[{i + 1}/{count}] Event from '{caller}' - "
                 f"Use Last-Event-ID to resume if disconnected"
             )
             await ctx.session.send_log_message(
@@ -69,7 +69,7 @@ def main(
                 # - nowhere (if GET request isn't supported)
                 related_request_id=ctx.request_id,
             )
-            logger.debug(f"Sent notification {i+1}/{count} for caller: {caller}")
+            logger.debug(f"Sent notification {i + 1}/{count} for caller: {caller}")
             if i < count - 1:  # Don't wait after the last notification
                 await anyio.sleep(interval)
 

src/mcp/cli/claude.py

@@ -35,7 +35,7 @@ def get_uv_path() -> str:
     uv_path = shutil.which("uv")
     if not uv_path:
         logger.error(
-            "uv executable not found in PATH, falling back to 'uv'. " "Please ensure uv is installed and in your PATH"
+            "uv executable not found in PATH, falling back to 'uv'. Please ensure uv is installed and in your PATH"
         )
         return "uv"  # Fall back to just "uv" if not found
     return uv_path

src/mcp/cli/cli.py

@@ -150,10 +150,10 @@ def _import_server(file: Path, server_object: str | None = None):
             True if it's supported.
         """
         if not isinstance(server_object, FastMCP):
-            logger.error(f"The server object {object_name} is of type " f"{type(server_object)} (expecting {FastMCP}).")
+            logger.error(f"The server object {object_name} is of type {type(server_object)} (expecting {FastMCP}).")
             if isinstance(server_object, LowLevelServer):
                 logger.warning(
-                    "Note that only FastMCP server is supported. Low level " "Server class is not yet supported."
+                    "Note that only FastMCP server is supported. Low level Server class is not yet supported."
                 )
             return False
         return True
@@ -164,7 +164,7 @@ def _import_server(file: Path, server_object: str | None = None):
         for name in ["mcp", "server", "app"]:
             if hasattr(module, name):
                 if not _check_server_object(getattr(module, name), f"{file}:{name}"):
-                    logger.error(f"Ignoring object '{file}:{name}' as it's not a valid " "server object")
+                    logger.error(f"Ignoring object '{file}:{name}' as it's not a valid server object")
                     continue
                 return getattr(module, name)
 
@@ -269,7 +269,7 @@ def dev(
         npx_cmd = _get_npx_command()
         if not npx_cmd:
             logger.error(
-                "npx not found. Please ensure Node.js and npm are properly installed " "and added to your system PATH."
+                "npx not found. Please ensure Node.js and npm are properly installed and added to your system PATH."
             )
             sys.exit(1)
 
@@ -371,7 +371,7 @@ def install(
         typer.Option(
             "--name",
             "-n",
-            help="Custom name for the server (defaults to server's name attribute or" " file name)",
+            help="Custom name for the server (defaults to server's name attribute or file name)",
         ),
     ] = None,
     with_editable: Annotated[
@@ -445,7 +445,7 @@ def install(
             name = server.name
         except (ImportError, ModuleNotFoundError) as e:
             logger.debug(
-                "Could not import server (likely missing dependencies), using file" " name",
+                "Could not import server (likely missing dependencies), using file name",
                 extra={"error": str(e)},
             )
             name = file.stem

src/mcp/client/session.py

@@ -168,7 +168,7 @@ class ClientSession(
         )
 
         if result.protocolVersion not in SUPPORTED_PROTOCOL_VERSIONS:
-            raise RuntimeError("Unsupported protocol version from the server: " f"{result.protocolVersion}")
+            raise RuntimeError(f"Unsupported protocol version from the server: {result.protocolVersion}")
 
         await self.send_notification(
             types.ClientNotification(types.InitializedNotification(method="notifications/initialized"))

src/mcp/client/sse.py

@@ -83,7 +83,7 @@ async def sse_client(
                                             or url_parsed.scheme != endpoint_parsed.scheme
                                         ):
                                             error_msg = (
-                                                "Endpoint origin does not match " f"connection origin: {endpoint_url}"
+                                                f"Endpoint origin does not match connection origin: {endpoint_url}"
                                             )
                                             logger.error(error_msg)
                                             raise ValueError(error_msg)
@@ -125,7 +125,7 @@ async def sse_client(
                                         ),
                                     )
                                     response.raise_for_status()
-                                    logger.debug("Client message sent successfully: " f"{response.status_code}")
+                                    logger.debug(f"Client message sent successfully: {response.status_code}")
                         except Exception as exc:
                             logger.error(f"Error in post_writer: {exc}")
                         finally:

src/mcp/server/auth/handlers/authorize.py

@@ -33,7 +33,7 @@ class AuthorizationRequest(BaseModel):
     state: str | None = Field(None, description="Optional state parameter")
     scope: str | None = Field(
         None,
-        description="Optional scope; if specified, should be " "a space-separated list of scope strings",
+        description="Optional scope; if specified, should be a space-separated list of scope strings",
     )
     resource: str | None = Field(
         None,

src/mcp/server/auth/handlers/register.py

@@ -72,7 +72,7 @@ class RegistrationHandler:
             return PydanticJSONResponse(
                 content=RegistrationErrorResponse(
                     error="invalid_client_metadata",
-                    error_description="grant_types must be authorization_code " "and refresh_token",
+                    error_description="grant_types must be authorization_code and refresh_token",
                 ),
                 status_code=400,
             )

src/mcp/server/auth/handlers/token.py

@@ -119,9 +119,7 @@ class TokenHandler:
             return self.response(
                 TokenErrorResponse(
                     error="unsupported_grant_type",
-                    error_description=(
+                    error_description=(f"Unsupported grant type (supported grant types are {client_info.grant_types})"),
-                        f"Unsupported grant type (supported grant types are " f"{client_info.grant_types})"
-                    ),
                 )
             )
 
@@ -166,7 +164,7 @@ class TokenHandler:
                     return self.response(
                         TokenErrorResponse(
                             error="invalid_request",
-                            error_description=("redirect_uri did not match the one " "used when creating auth code"),
+                            error_description=("redirect_uri did not match the one used when creating auth code"),
                         )
                     )
 
@@ -222,7 +220,7 @@ class TokenHandler:
                         return self.response(
                             TokenErrorResponse(
                                 error="invalid_scope",
-                                error_description=(f"cannot request scope `{scope}` " "not provided by refresh token"),
+                                error_description=(f"cannot request scope `{scope}` not provided by refresh token"),
                             )
                         )
 

src/mcp/server/fastmcp/server.py

@@ -390,7 +390,7 @@ class FastMCP:
         # Check if user passed function directly instead of calling decorator
         if callable(name):
             raise TypeError(
-                "The @tool decorator was used incorrectly. " "Did you forget to call it? Use @tool() instead of @tool"
+                "The @tool decorator was used incorrectly. Did you forget to call it? Use @tool() instead of @tool"
             )
 
         def decorator(fn: AnyFunction) -> AnyFunction:
@@ -497,7 +497,7 @@ class FastMCP:
 
                 if uri_params != func_params:
                     raise ValueError(
-                        f"Mismatch between URI parameters {uri_params} " f"and function parameters {func_params}"
+                        f"Mismatch between URI parameters {uri_params} and function parameters {func_params}"
                     )
 
                 # Register as template

src/mcp/server/fastmcp/tools/base.py

@@ -27,7 +27,7 @@ class Tool(BaseModel):
     description: str = Field(description="Description of what the tool does")
     parameters: dict[str, Any] = Field(description="JSON schema for tool parameters")
     fn_metadata: FuncMetadata = Field(
-        description="Metadata about the function including a pydantic model for tool" " arguments"
+        description="Metadata about the function including a pydantic model for tool arguments"
     )
     is_async: bool = Field(description="Whether the tool is async")
     context_kwarg: str | None = Field(None, description="Name of the kwarg that should receive context")

src/mcp/shared/auth.py

@@ -87,7 +87,7 @@ class OAuthClientMetadata(BaseModel):
         elif len(self.redirect_uris) == 1:
             return self.redirect_uris[0]
         else:
-            raise InvalidRedirectUriError("redirect_uri must be specified when client " "has multiple registered URIs")
+            raise InvalidRedirectUriError("redirect_uri must be specified when client has multiple registered URIs")
 
 
 class OAuthClientInformationFull(OAuthClientMetadata):

src/mcp/shared/session.py

@@ -402,7 +402,7 @@ class BaseSession(
                         except Exception as e:
                             # For other validation errors, log and continue
                             logging.warning(
-                                f"Failed to validate notification: {e}. " f"Message was: {message.message.root}"
+                                f"Failed to validate notification: {e}. Message was: {message.message.root}"
                             )
                     else:  # Response or error
                         stream = self._response_streams.pop(message.message.root.id, None)
@@ -410,7 +410,7 @@ class BaseSession(
                             await stream.send(message.message.root)
                         else:
                             await self._handle_incoming(
-                                RuntimeError("Received response with an unknown " f"request ID: {message}")
+                                RuntimeError(f"Received response with an unknown request ID: {message}")
                             )
 
             except anyio.ClosedResourceError:

tests/client/test_resource_cleanup.py

@@ -57,8 +57,7 @@ async def test_send_request_stream_cleanup():
 
     # Verify that no response streams were leaked
     assert len(session._response_streams) == initial_stream_count, (
-        f"Expected {initial_stream_count} response streams after request, "
+        f"Expected {initial_stream_count} response streams after request, but found {len(session._response_streams)}"
-        f"but found {len(session._response_streams)}"
     )
 
     # Clean up

tests/server/fastmcp/auth/test_auth_integration.py

@@ -658,7 +658,7 @@ class TestAuthEndpoints:
         assert "error" in error_data
         assert error_data["error"] == "invalid_client_metadata"
         assert error_data["error_description"] == (
-            "redirect_uris.0: Input should be a valid URL, " "relative URL without a base"
+            "redirect_uris.0: Input should be a valid URL, relative URL without a base"
         )
 
     @pytest.mark.anyio

tests/server/fastmcp/test_integration.py

@@ -696,7 +696,7 @@ def everything_streamable_http_server(
             time.sleep(0.1)
             attempt += 1
     else:
-        raise RuntimeError(f"Comprehensive StreamableHTTP server failed to start after " f"{max_attempts} attempts")
+        raise RuntimeError(f"Comprehensive StreamableHTTP server failed to start after {max_attempts} attempts")
 
     yield