KeepPlain: session history for coding agents

About

KeepPlain is a plugin and command-line tool that keeps coding agent session history so users do not explain the same thing twice. It lets an agent search past sessions, shows which agent session wrote each line of a file, and builds a handoff brief on the user's computer to continue in another agent when a Claude usage limit nears. It works with Claude Code, Codex, Cursor, Pi and Antigravity, and replaces detected secrets locally before sending any session.