A persistent, append-only record of decisions made in meetings, with enough context that someone joining six months later can understand both what was decided and why. A good decision log entry captures: the decision itself in one sentence, the alternatives that were considered, the trade-offs that were discussed, the people involved, and the date. Decision logs are the institutional memory of a team — without one, teams relitigate the same trade-offs every few months as new members join. AI meeting copilots extract decisions from transcripts by detecting phrases like "let's go with," "we're decided," "final call is." The output of every meeting where any non-trivial choice was made should include a decision log entry in the recap.