Most important feature for me is converting from ASCII to "fancy" quotes and apostrophes, which Substack inserts automatically in its editor. Some more advanced features are probably broken, because Substack's editor is a bit wonky, but the basic stuff all works. Give it a try!
And here's the source: https://github.com/simpolism/md-to-substack
To my understanding of this protocol it looks like it's an entity exposing a set of capabilities. Why is that different and complementary to an MCP server exposing tools? Why would you be limited to an "everything agent" in MCP?
I am struggling to see the core problem that this protocol addresses.
My assumption is that the initial A2A implementation will be done with MCP, so the LLM can ask your AI directory or marketplace for help with a task via some kind of "phone a friend" tool call, and it'll be able to immediately interop and get the info it needs to complete the task.