reaction

kylon workspace reaction — kylon workspace help detail

reaction — add or remove reactions on messages
  kylon workspace reaction add --message <message_id> --key <reaction_key>
  kylon workspace reaction add --message <message_id> --emoji <shortcode>
  kylon workspace reaction remove --message <message_id> --key <reaction_key>
  kylon workspace reaction remove --message <message_id> --emoji <shortcode>
  kylon workspace reaction list
    Built-in keys: thumbs_up, ok_hand, white_check, tada, eyes, rocket, pray, heart, raised_hands, fire, hundred, clap, thinking, bulb, joy, smile, handshake, question, pushpin, alarm, sparkles, exploding.
    --emoji also accepts built-in keys (e.g. --emoji eyes works the same as --key eyes).
    Use --emoji <shortcode> for workspace custom emoji such as shipit.

Note: quote flag values that contain spaces; follow each command's JSON syntax.