User guide

Use Leyline to create, inspect, and control pi sessions.

Start a session

Use the start screen to select a project and send the first prompt.

Use projects and search to change the current project, find sessions, and follow activity.

Use these pages for the main session tasks:

Sessions: select, rename, create, and delete sessions.
Workbench: use the header, transcript, drawers, and live output.
Git review: inspect staged, working-tree, and untracked project changes.
Composer: send prompts, shell commands, images, steering messages, and editable Up next tasks.
Deep research: run parallel research threads and inspect cited reports and source evidence.
Runtime controls: select a model, thinking level, and supported ultrafast mode, and inspect tools and context usage.
Tools and thinking: inspect thoughts, System changes, MCP tools, confirmation cards, skills, and rollout feedback.
Tracing: inspect recorded runs, model calls, tool results, timing, and usage. Control capture on the selected backend.
Editing, forking, resetting, and compaction: change or branch session history.