What Colophon actually records
Every session becomes a TWFF file — a timestamped log of a few categories of events, not a recording of keystrokes.
Writing activity
Edits are grouped into blocks (not individual keystrokes) with a position and a short before/after snapshot — enough to reconstruct what changed, never a keystroke-by-keystroke timeline.
Pasted & external content
Pastes, cited links, and inserted images — where they landed and a short preview, not the full source.
AI interactions
Which model, what was suggested (a short preview, not the full prompt), and how much of it survived into the kept text — a similarity score, not a verdict.
Session shape
Start/end times and periodic word-count checkpoints — enough to see how a document came together over time.
Full field-level detail: the format is open — see the TWFF specification.