fix: remove -> str return annotations from all mcp.tool() functions

FastMCP generates an outputSchema from the return type annotation, which
inflates the tools/list payload and triggers truncation in Claude Desktop.
Dropping the annotations suppresses outputSchema generation entirely.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/mcp_synology_filestation/tools/filestation.py

@@ -105,7 +105,7 @@ def register_filestation(
             delay = min(delay * 2, 2.0)
 
     @mcp.tool()
-    async def list_shares() -> str:
+    async def list_shares():
         """List all shared folders visible to the authenticated user.
 
         Returns a formatted table with share name, path, and volume status.
@@ -163,7 +163,7 @@ def register_filestation(
         limit: int = 100,
         sort_by: str = "name",
         sort_direction: str = "asc",
-    ) -> str:
+    ):
         """List the contents of a directory on the NAS.
 
         Use share paths as returned by list_shares (e.g. "/dev", "/data"),
@@ -265,7 +265,7 @@ def register_filestation(
         pattern: str,
         recursive: bool = True,
         max_results: int = 200,
-    ) -> str:
+    ):
         """Search for files matching a glob pattern within a directory.
 
         Starts an async DSM search task, polls until complete, then cleans up.
@@ -399,7 +399,7 @@ def register_filestation(
         return "\n".join(lines)
 
     @mcp.tool()
-    async def download(path: str) -> str:
+    async def download(path: str):
         """Download a single file from the NAS and return its content as base64.
 
         Files larger than 10 MB are rejected — use SFTP or another method instead.
@@ -438,7 +438,7 @@ def register_filestation(
         )
 
     @mcp.tool()
-    async def get_info(path: str) -> str:
+    async def get_info(path: str):
         """Get detailed metadata for one or more files or folders on the NAS.
 
         Accepts a single path or a comma-separated list of paths.
@@ -539,7 +539,7 @@ def register_filestation(
         return "\n".join(lines)
 
     @mcp.tool()
-    async def check_exist(path: str) -> str:
+    async def check_exist(path: str):
         """Check whether one or more files or folders exist on the NAS.
 
         Accepts a single path or a comma-separated list of paths.
@@ -602,7 +602,7 @@ def register_filestation(
         path: str,
         name: str,
         create_parents: bool = False,
-    ) -> str:
+    ):
         """Create a new folder on the NAS.
 
         Args:
@@ -634,7 +634,7 @@ def register_filestation(
         return f"Created: {created_path}"
 
     @mcp.tool()
-    async def rename(path: str, new_name: str) -> str:
+    async def rename(path: str, new_name: str):
         """Rename a file or folder on the NAS.
 
         Args:
@@ -665,7 +665,7 @@ def register_filestation(
         return f"Renamed to: {new_path}"
 
     @mcp.tool()
-    async def copy(src: str, dst: str, overwrite: bool = False) -> str:
+    async def copy(src: str, dst: str, overwrite: bool = False):
         """Copy a file or folder to a new location on the NAS.
 
         WARNING: Set overwrite=True only when you intentionally want to replace
@@ -710,7 +710,7 @@ def register_filestation(
         return f"Copied to: {dest_folder}/{filename}"
 
     @mcp.tool()
-    async def move(src: str, dst: str, overwrite: bool = False) -> str:
+    async def move(src: str, dst: str, overwrite: bool = False):
         """Move a file or folder to a new location on the NAS.
 
         WARNING: Set overwrite=True only when you intentionally want to replace
@@ -755,7 +755,7 @@ def register_filestation(
         return f"Moved to: {dest_folder}/{filename}"
 
     @mcp.tool()
-    async def delete(path: str, confirmed: bool = False) -> str:
+    async def delete(path: str, confirmed: bool = False):
         """Delete a file or folder on the NAS.
 
         WARNING: This operation is irreversible. Without confirmed=True,
@@ -809,7 +809,7 @@ def register_filestation(
         mode: str = "add",
         format: str = "zip",
         password: str = "",
-    ) -> str:
+    ):
         """Compress files or folders into an archive on the NAS.
 
         Creates a new archive asynchronously. Progress is polled until the operation
@@ -879,7 +879,7 @@ def register_filestation(
         keep_dir: bool = True,
         create_subfolder: bool = False,
         password: str = "",
-    ) -> str:
+    ):
         """Extract an archive file to a destination folder on the NAS.
 
         Supports ZIP and 7z archives. Runs asynchronously; progress is polled
@@ -939,7 +939,7 @@ def register_filestation(
         content_base64: str,
         overwrite: bool = False,
         create_parents: bool = True,
-    ) -> str:
+    ):
         """Upload a file to a directory on the NAS from base64-encoded content.
 
         WARNING: Set overwrite=True only when you intentionally want to replace