fix: add type annotations to fix Pyright errors

ROOT CAUSE:
Pyright reported 8 type errors about partially unknown types in list operations
and dictionary assignments. The issues were:
- skip_names list type inference
- direct_args dict type inference
- param.default type casting

CHANGES:
- Added explicit type annotation `skip_names: list[str]` in tools/base.py
- Added explicit type annotation `skip_names: list[str]` in prompts/base.py
- Added explicit type annotation `direct_args: dict[str, Any]` in tools/base.py
- Added type ignore comment for param.default assignment in dependencies.py

IMPACT:
- Fixes all 8 Pyright type errors
- CI pre-commit hook will now pass
- Type safety improved with explicit annotations

Refs: #2081

Author: peter-luminova

src/mcp/server/mcpserver/prompts/base.py

@@ -111,7 +111,7 @@ def from_function(
         dependency_kwarg_names = list(dependency_params.keys())
 
         # Get schema from func_metadata, excluding context and dependency parameters
-        skip_names = []
+        skip_names: list[str] = []
         if context_kwarg:
             skip_names.append(context_kwarg)
         skip_names.extend(dependency_kwarg_names)

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

@@ -78,7 +78,7 @@ def from_function(
         dependency_kwarg_names = list(dependency_params.keys())
 
         # Skip both context and dependency params from arg_model
-        skip_names = []
+        skip_names: list[str] = []
         if context_kwarg:
             skip_names.append(context_kwarg)
         skip_names.extend(dependency_kwarg_names)
@@ -115,7 +115,7 @@ async def run(
         """Run the tool with arguments."""
         try:
             # Build direct args (context and dependencies)
-            direct_args = {}
+            direct_args: dict[str, Any] = {}
             if self.context_kwarg is not None:
                 direct_args[self.context_kwarg] = context
 

src/mcp/server/mcpserver/utilities/dependencies.py

@@ -63,6 +63,6 @@ def find_dependency_parameters(
 
         # Check if default is Depends instance
         if isinstance(param.default, Depends):
-            deps[param_name] = param.default
+            deps[param_name] = param.default  # type: ignore[assignment]
 
     return deps