Hooks

What claude-session-driver runs automatically, and when. A hook is a command Claude Code fires at a fixed moment, without you asking for it.

obra@obra-2

GitHub

From plugin

claude-session-driver

1131 skill5 hooks

Install

> /plugin marketplace add obra/claude-session-driver

Ships with claude-session-driver. Installing the plugin gets these hooks.

What fires, and when

PreToolUse

Matches*node "${CLAUDE_PLUGIN_ROOT}/dist/emit-event.cjs"

SessionStart

Fires once when a session begins, and again after a context compaction. It is where a plugin sets up its environment, or restores state the compaction dropped.

Matches*node "${CLAUDE_PLUGIN_ROOT}/dist/emit-event.cjs"

Stop

Matches*node "${CLAUDE_PLUGIN_ROOT}/dist/emit-event.cjs"

UserPromptSubmit

Fires before Claude sees each prompt you send. A plugin can use it to inject context, so the same instruction reaches the model every turn instead of only at session start.