SessionStart

The SessionStart hook is an initialization lifecycle event that triggers at the very beginning of a Claude Code interaction. Unlike other hooks that react to specific user prompts or file edits, SessionStart is designed to bootstrap your environment and inject high-priority context before the first prompt is even processed.

Visit the following resources to learn more:

• @official@Hooks reference
• @official@Automate workflows with hooks
• @article@Claude Code Session Hooks: Make Every Session Start Smart (and End Clean)