fix: resolve pyright and coverage CI failures

- Add pragma no cover to version-conditional imports (Python 3.10 compat)
- Add type: ignore for pyright false positives (isinstance in loop, duck-type assignment)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Varun Sharma

src/mcp/server/experimental/task_support.py

@@ -80,7 +80,7 @@ async def run(self) -> AsyncIterator[None]:
                 ...
         """
         async with create_mcp_task_group() as tg:
-            self._task_group = tg
+            self._task_group = tg  # type: ignore[assignment]
             try:
                 yield
             finally:

src/mcp/shared/_task_group.py

@@ -18,7 +18,7 @@
 import anyio
 from anyio.abc import TaskGroup
 
-if sys.version_info < (3, 11):
+if sys.version_info < (3, 11):  # pragma: no cover
     from exceptiongroup import BaseExceptionGroup
 
 
@@ -28,7 +28,7 @@ def collapse_exception_group(exc: BaseExceptionGroup) -> BaseException:  # type:
     If the group (and any nested groups) each contain exactly one exception,
     return the innermost real exception.  Otherwise return *exc* unchanged.
     """
-    while isinstance(exc, BaseExceptionGroup) and len(exc.exceptions) == 1:
+    while isinstance(exc, BaseExceptionGroup) and len(exc.exceptions) == 1:  # type: ignore[reportUnnecessaryIsInstance]
         exc = exc.exceptions[0]  # type: ignore[assignment]
     return exc
 

tests/shared/test_task_group.py

@@ -12,7 +12,7 @@
     create_mcp_task_group,
 )
 
-if sys.version_info < (3, 11):
+if sys.version_info < (3, 11):  # pragma: no cover
     from exceptiongroup import BaseExceptionGroup, ExceptionGroup
 
 # ---------------------------------------------------------------------------