Serves an agent over A2A's JSON-RPC binding with
A2UIAgent.A2A.Server.
forward "/a2a", A2UIAgent.A2A.Plug, agent: MyAgentMyAgent implements A2UIAgent.A2A.Agent. A POST carries a
JSON-RPC request: message/send is answered with JSON and
message/stream with server-sent events, one JSON-RPC response per
event. A body that is not JSON gets a JSON-RPC parse error (-32700).
A GET returns the agent's card, when it has one.
The X-A2A-Extensions request header lists the extensions the client
requests. The A2UI extension activated for the request, which must be
one the agent's card advertises, is listed in the same response
header.
The body is read as JSON unless a Plug.Parsers before this plug has
already parsed it. This module needs the optional plug dependency.
Options: :agent (required); :max_body_length in bytes (default
8,000,000; a longer body gets status 413).