diff --git a/tools/registry.go b/tools/registry.go
index 9116f08..fc3bb7c 100644
--- a/tools/registry.go
+++ b/tools/registry.go
@@ -18,7 +18,7 @@
 	Description() string
 
 	// InputSchema returns the JSON schema for the tool's input parameters
-	InputSchema() map[string]interface{}
+	InputSchema() map[string]any
 
 	// Execute runs the tool with the given arguments and returns the result
 	Execute(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error)