Sheldon Finlay
a1a3dfbd63
The tmux display-message approach had edge cases: it could succeed outside tmux, fail on first iteration, or behave differently depending on tmux socket state. Replace with AGENT_LOOP_ACTIVE env var exported by loop.sh. CC sessions spawned by the loop inherit it; interactive CC sessions don't. Simple, no external dependencies, no race conditions.
63 lines
2.4 KiB
Bash
63 lines
2.4 KiB
Bash
#!/bin/bash
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# Stop hook management for the agent loop.
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#
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# The Stop hook sends SIGINT to the loop's parent process when a claude session
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# finishes. This is how claude signals "I'm done" back to the bash loop —
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# the Ralph pattern (ghuntley.com/ralph).
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#
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# Without this hook, claude would exit to an interactive prompt instead of
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# returning control to the loop script.
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#
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# IMPORTANT: The hook is scoped to only fire inside the agent-loop tmux session.
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# Without this guard, ANY Claude Code session opened in the same project directory
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# would pick up the hook and kill its own parent shell on exit.
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SETTINGS_FILE="${PROJECT_ROOT}/.claude/settings.local.json"
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# The hook checks AGENT_LOOP_ACTIVE before killing. This env var is exported by
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# loop.sh and inherited by CC sessions it spawns. Interactive CC sessions in the
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# same project won't have it set, so the hook is a no-op for them.
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HOOK_COMMAND='[ "${AGENT_LOOP_ACTIVE:-}" = "1" ] && kill -INT $PPID || true'
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install_hooks() {
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if [ ! -f "$SETTINGS_FILE" ]; then
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mkdir -p "$(dirname "$SETTINGS_FILE")"
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echo '{}' > "$SETTINGS_FILE"
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fi
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if command -v jq &>/dev/null; then
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jq --arg cmd "$HOOK_COMMAND" \
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'.hooks.Stop = [{"matcher": "", "hooks": [{"type": "command", "command": $cmd}]}]' \
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"$SETTINGS_FILE" > "${SETTINGS_FILE}.tmp" && mv "${SETTINGS_FILE}.tmp" "$SETTINGS_FILE"
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else
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LOOP_HOOK_CMD="$HOOK_COMMAND" LOOP_SETTINGS="$SETTINGS_FILE" python3 -c "
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import json, os
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p = os.environ['LOOP_SETTINGS']
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cmd = os.environ['LOOP_HOOK_CMD']
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s = json.load(open(p)) if os.path.exists(p) else {}
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s.setdefault('hooks', {})['Stop'] = [{'matcher': '', 'hooks': [{'type': 'command', 'command': cmd}]}]
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json.dump(s, open(p, 'w'), indent=2)
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"
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fi
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log "Stop hook installed"
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}
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remove_hooks() {
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if [ -f "$SETTINGS_FILE" ]; then
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if command -v jq &>/dev/null; then
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jq 'del(.hooks.Stop)' "$SETTINGS_FILE" > "${SETTINGS_FILE}.tmp" && mv "${SETTINGS_FILE}.tmp" "$SETTINGS_FILE"
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jq 'if .hooks == {} then del(.hooks) else . end' "$SETTINGS_FILE" > "${SETTINGS_FILE}.tmp" && mv "${SETTINGS_FILE}.tmp" "$SETTINGS_FILE"
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else
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LOOP_SETTINGS="$SETTINGS_FILE" python3 -c "
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import json, os
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p = os.environ['LOOP_SETTINGS']
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s = json.load(open(p))
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s.get('hooks', {}).pop('Stop', None)
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if not s.get('hooks'): s.pop('hooks', None)
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json.dump(s, open(p, 'w'), indent=2)
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"
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fi
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log "Stop hook removed"
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fi
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}
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