Manage multi-session development work with structured progress files, checkpoint commits, and durable learnings. Produces SESSION.md files that survive context compaction and enable clean handoff between sessions.
When: Beginning multi-step work, "start session", "new session for [feature]"
When: "checkpoint", major milestone reached, before risky changes, context getting large
Manage long development sessions with structured progress tracking. Creates SESSION.md files for multi-session handoff, checkpoints progress with WIP commits, and captures learnings to CLAUDE.md. Trigger with 'start session', 'checkpoint', 'wrap session', 'resume session', or 'context getting full'. Source: jezweb/claude-skills.