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fix(ralph-loop): lazy-claim session_id for cross-session isolation #981

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fix(ralph-loop): lazy-claim session_id for cross-session isolation #981

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12 changes: 11 additions & 1 deletion plugins/ralph-loop/hooks/stop-hook.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -27,9 +27,19 @@ COMPLETION_PROMISE=$(echo "$FRONTMATTER" | grep '^completion_promise:' | sed 's/
# Session isolation: the state file is project-scoped, but the Stop hook
# fires in every Claude Code session in that project. If another session
# started the loop, this session must not block (or touch the state file).
# Legacy state files without session_id fall through (preserves old behavior).
STATE_SESSION=$(echo "$FRONTMATTER" | grep '^session_id:' | sed 's/session_id: *//' || true)
HOOK_SESSION=$(echo "$HOOK_INPUT" | jq -r '.session_id // ""')

# Lazy claim: CLAUDE_CODE_SESSION_ID env var is not available to plugin
# scripts at setup time, but the stop hook receives session_id via stdin
# JSON. On first invocation, claim the loop for the current session.
if [[ -z "$STATE_SESSION" ]] && [[ -n "$HOOK_SESSION" ]]; then
TEMP_FILE="${RALPH_STATE_FILE}.tmp.$$"
sed "s/^session_id:.*/session_id: $HOOK_SESSION/" "$RALPH_STATE_FILE" > "$TEMP_FILE"
mv "$TEMP_FILE" "$RALPH_STATE_FILE"
STATE_SESSION="$HOOK_SESSION"
fi

if [[ -n "$STATE_SESSION" ]] && [[ "$STATE_SESSION" != "$HOOK_SESSION" ]]; then
exit 0
fi
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