fix: allow Any type for logging message parameter

Change the type annotation of the message parameter in Context.log(),
Context.debug(), Context.info(), Context.warning(), and Context.error()
from str to Any.

The MCP spec defines the log data field as:
  data: unknown - "Any JSON serializable type is allowed here"

This allows MCP servers to send rich structured notifications:
  ctx.info({"event": "progress", "percent": 50})

The parameter name is kept as message for backward compatibility.

Fixes #397

Author: maxisbey

.github/workflows/claude-code-review.yml

@@ -187,7 +187,7 @@ async def elicit_url(
     async def log(
         self,
         level: Literal["debug", "info", "warning", "error"],
-        message: str,
+        message: Any,
         *,
         logger_name: str | None = None,
         extra: dict[str, Any] | None = None,
@@ -196,7 +196,7 @@ async def log(
 
         Args:
             level: Log level (debug, info, warning, error)
-            message: Log message
+            message: The data to log. Any JSON-serializable type (string, dict, list, etc.)
             logger_name: Optional logger name
             extra: Optional dictionary with additional structured data to include
         """
@@ -261,20 +261,20 @@ async def close_standalone_sse_stream(self) -> None:
             await self._request_context.close_standalone_sse_stream()
 
     # Convenience methods for common log levels
-    async def debug(self, message: str, *, logger_name: str | None = None, extra: dict[str, Any] | None = None) -> None:
+    async def debug(self, message: Any, *, logger_name: str | None = None, extra: dict[str, Any] | None = None) -> None:
         """Send a debug log message."""
         await self.log("debug", message, logger_name=logger_name, extra=extra)
 
-    async def info(self, message: str, *, logger_name: str | None = None, extra: dict[str, Any] | None = None) -> None:
+    async def info(self, message: Any, *, logger_name: str | None = None, extra: dict[str, Any] | None = None) -> None:
         """Send an info log message."""
         await self.log("info", message, logger_name=logger_name, extra=extra)
 
     async def warning(
-        self, message: str, *, logger_name: str | None = None, extra: dict[str, Any] | None = None
+        self, message: Any, *, logger_name: str | None = None, extra: dict[str, Any] | None = None
     ) -> None:
         """Send a warning log message."""
         await self.log("warning", message, logger_name=logger_name, extra=extra)
 
-    async def error(self, message: str, *, logger_name: str | None = None, extra: dict[str, Any] | None = None) -> None:
+    async def error(self, message: Any, *, logger_name: str | None = None, extra: dict[str, Any] | None = None) -> None:
         """Send an error log message."""
         await self.log("error", message, logger_name=logger_name, extra=extra)