claude-code-slack-stop-hook.json

A Claude Code hook that posts to Slack when a turn takes longer than two minutes, so you can walk away from long agent runs and get pulled back when they're done.

1. Save 1-notify-long-turn.sh to~/.claude/hooks/notify-long-turn.sh , thenchmod +x it.
2. Create a Slack incoming webhook and export the URL asSLACK_WEBHOOK_URL .
3. Set MENTION in the script to your own Slack member ID (Slack profile -> More -> Copy member ID). Without the mention the message is silent -- the mention is what makes Slack actually notify you.
4. Merge 2-settings-snippet.json into~/.claude/settings.json , replacing the paths with absolute ones.settings.json does not expand$HOME .

Requires jq and curl.

UserPromptSubmit stamps the turn's start time to /tmp. Stop reads it back,

and if the turn ran >= THRESHOLD_SECS (default 120) it posts to the webhook. A missing stamp file means the Stop came from /clear, a resume, or a compact, so there's nothing to time and the hook exits quietly.

The Stop hook is async, so it never adds latency to your turn.

• THRESHOLD_SECS -- raise it if you get pinged too often.
• Stamp files are per-session in /tmp ; a session that dies without aStop leaves one behind. Harmless, butrm /tmp/claude-turn-start-* clears them.

The webhook call is fire-and-forget: output is discarded, so the hook reports success whether or not Slack accepted the post. Fine for a personal nudge, but don't debug Slack delivery by trusting that message.