I have been using iCab mobile frequently, and often put markdown links in a text editor like Byword to use as a bookmark manager; here is an alternative bookmarklet/Drafts URL action that opens the markdown link in iCab.
(The semi-colon at the end seems to be necessary for iCab but not other iOS browsers -- feel free to experiment.)
In your iOS browser of choice, save any page as a bookmark and retitle it (e.g., "iCab-MD").
texttool-icab action. Tap on this link while you're on your iOS device to install it. (You must own a copy of both Drafts and TextTool to make this action work. However, you don't have to set up TextTool to do anything.)
Here is the URL Action:
The bookmarklet sends the page's title and URL in markdown link format to Drafts.
Drafts sends the draft to TextTool, which replaces
web (which is the URL scheme to open a web page in iCab).
TextTool copies the results to the clipboard, then sends the user to Byword. (If you want it to send you to a different text editor, just add its URL scheme after the