support messages in progress notifications

pyproject.toml

@@ -7,7 +7,7 @@ dependencies = [
     "python-dotenv>=1.1.0",
     "exceptiongroup>=1.2.2",
     "httpx>=0.28.1",
-    "mcp>=1.8.1,<2.0.0",
+    "mcp>=1.9.0,<2.0.0",
     "openapi-pydantic>=0.5.1",
     "rich>=13.9.4",
     "typer>=0.15.2",

src/fastmcp/client/client.py

@@ -168,9 +168,12 @@ async def progress(
         progress_token: str | int,
         progress: float,
         total: float | None = None,
+        message: str | None = None,
     ) -> None:
         """Send a progress notification."""
-        await self.session.send_progress_notification(progress_token, progress, total)
+        await self.session.send_progress_notification(
+            progress_token, progress, total, message
+        )
 
     async def set_logging_level(self, level: mcp.types.LoggingLevel) -> None:
         """Send a logging/setLevel request."""

src/fastmcp/server/context.py

@@ -56,7 +56,7 @@ def my_tool(x: int, ctx: Context) -> str:
         ctx.error("Error message")
 
         # Report progress
-        ctx.report_progress(50, 100)
+        ctx.report_progress(50, 100, "Processing")
 
         # Access resources
         data = ctx.read_resource("resource://data")
@@ -96,7 +96,7 @@ def request_context(self) -> RequestContext:
         return self.fastmcp._mcp_server.request_context
 
     async def report_progress(
-        self, progress: float, total: float | None = None
+        self, progress: float, total: float | None = None, message: str | None = None
     ) -> None:
         """Report progress for the current operation.
 
@@ -115,7 +115,10 @@ async def report_progress(
             return
 
         await self.request_context.session.send_progress_notification(
-            progress_token=progress_token, progress=progress, total=total
+            progress_token=progress_token,
+            progress=progress,
+            total=total,
+            message=message,
         )
 
     async def read_resource(self, uri: str | AnyUrl) -> list[ReadResourceContents]: