# File lib/net/ssh/authentication/agent.rb, line 80
80:     def negotiate!
81:       # determine what type of agent we're communicating with
82:       type, body = send_and_wait(SSH2_AGENT_REQUEST_VERSION, :string, Transport::ServerVersion::PROTO_VERSION)
83: 
84:       if type == SSH2_AGENT_VERSION_RESPONSE
85:         raise NotImplementedError, "SSH2 agents are not yet supported"
86:       elsif type != SSH_AGENT_RSA_IDENTITIES_ANSWER1 && type != SSH_AGENT_RSA_IDENTITIES_ANSWER2
87:         raise AgentError, "unknown response from agent: #{type}, #{body.to_s.inspect}"
88:       end
89:     end