All or nearly all (hey, maybe someone's incommunicado) of the main cast is regularly kept apprised of all important events. If something big happens, everyone knows within a couple of chapters or episodes. No one learns 50 episodes later that everyone else knew his brother was a spy, or that her husband was cheating on her. The characters are actively trying to relay important information and relationships to one another. The complete opposite of Poor Communication Kills. Doesn't happen often due to Rule of Drama, but when it does, the story is usually better for it.
Note that this does not require the complete absence of information that someone is being kept from knowing. If the characters are otherwise making an active effort at pushing info, or not making decisions based on or despite unknown feelings, around then it still applies.
Subtrope of Conservation of Detail. Compare I Know You Know I Know.
Examples:
- In Eden of the East, everyone is kept apprised of the evolving situation as information filters through. It helps that cell phones are a major part of the plot.
- In Fullmetal Alchemist, the heroes make every attempt to inform each other despite being spread out. There is only one aversion, when the death of Hughes is kept from the Elrics.
- Marta telling Al about Fuhrer Bradley in Fullmetal Alchemist (2003); as soon as she learns the information, telling him is the first thing she does (which is good as immediately afterward, Bradley kills her).
- Ebott's Wake: All the main characters know about plot developments relating to the town at largenote by the time they become relevant. Even though not all the main characters directly interact much, cell phones and the the overlaps between various groups of main characters ensure that everyone's up to date. If something catches a protagonistic character off-guard, it's only because none of the rest of the main cast could've told them.
- In Scott Pilgrim vs. The World, everyone knows pretty much immediately about Scott, age 23, dating a high schooler, to the point that Scott tells his friend Wallace, who is drunk and passed out, and not two seconds later Scott's sister calls to yell at him about it.
Scott (noticing Wallace, who is passed out but holding his cell phone as if he'd sent a text while unconscious): Wallace, that gossipy bitch...
- Katherine Kurtz's Deryni novels The Bishop's Heir and The King's Justice. Many of the characters make regular efforts to invoke Mind Speech over distances to explain where they are on a military campaign, or to keep the ones on campaign up to date on what's happening back home. These efforts are often integral to the plot.
- Chuck, usually. Anytime there's a big secret between two characters, it's only an episode or two before it's resolved. The one big exception is Chuck's spy status.
- Stargate Universe: Maybe it's the close environment, but people on the Destiny don't keep secrets for very long.
- Averted in early seasons of Game of Thrones, where it takes reasonably long periods of time for characters on the other side of a continent (or on a different continent entirely) to hear even major news - it takes a full season for Daenerys to learn that King Robert is dead. However, later on when everyone starts Traveling at the Speed of Plot, even characters at vast distances apart will be immediately aware of everything that happens with no obvious indication that any in-universe time has passed.
- Used or averted whenever it's funny or convenient in Bob and George. Proto Man can read the comic to know what's happening elsewhere, but the author generally keeps track of who knows what. For example, even though Bob is a main character with a lot of screentime, several characters late in the strip have to stop and ask who he is because they've never spoken.
- The main cast of El Goonish Shive typically make a point of keeping each other in the loop regarding the constant supernatural happenings. As such, plotlines regarding one character not knowing something important only happen outside the main cast, and even temporary misunderstandings only happen when Susan is being reclusive and hasn't talked to anyone in a while.
