Announcer
Tells chat everything you do, like mining 55 dirt or eating a golden apple.
Doing the same thing over and over is added up and announced once you stop, so mining a vein sends Mined 12 Coal Ore! instead of twelve messages, and a single block reads Mined a Cobblestone block!. Messages wait their turn so chat isn't flooded, and anything still waiting when you change worlds is dropped.
Mining
Announce blocks you break, like Mined 55 Dirt!
Placing
Announce blocks you place, like Placed 12 Oak Planks!
Eating
Announce food you eat and potions you drink, like Ate a Golden Apple! or Drank a Potion of Swiftness!. Other items you finish using, like a goat horn, read Used.
Kills
Announce players you kill by name, like Killed Steve!, and mobs you hit in the last 10 seconds dying, added up like Killed 3 Zombies!
Deaths
Announce dying, with your killer when the death message names one, like Got killed by Steve!
Pickups
Announce items you pick up, like Picked up 32 Cobblestone!
Drops
Announce items you drop from your hand, like Dropped a Diamond Sword!
Walking
Announce how far you walked once you stop, like Walked 120 blocks!. Walks under 5 blocks and riding don't count.
Jumping
Announce your jumps, like Jumped 7 times!
Group time
How many seconds of not doing something again before its total is announced. Defaults to 3.
Message delay
The fewest seconds between two messages, so chat isn't flooded. Defaults to 3. Only the latest 5 waiting messages are kept.
Client only
Show the announcements in your own chat instead of sending them to the server.