Onboard

Onboard this Claude session on the current codebase. Produces a cached summary stored in the git directory, shared across all worktrees. Subsequent sessions load the cache instantly and only update what changed.

When to Use

• The user says "onboard", "onboard this project", or runs /onboard
• The user starts a new session on an unfamiliar codebase
• The user switches to a worktree and needs project context

Flags

• No flags (default): Key files mode — reads manifests, configs, entry points, READMEs, and a sample of source files. Fast, low token cost.
• --read-all: Full scan — reads all text-based source files. Thorough, higher token cost. Use for initial onboarding on a new project or when key files mode missed important context.
• --refresh: Forces a full rescan even if a cached summary exists. Combines with --read-all if both are passed.

Setup

Determine the shared git directory: