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fix(ralph-loop): isolate loop state to the session that started it

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The state file lives at .claude/ralph-loop.local.md — project-scoped,
not session-scoped. The plugin's Stop hook fires in every Claude Code
session open in that project directory. So if session A starts a loop,
session B's Stop events also find the state file and block, feeding A's
prompt into B and consuming A's iteration budget.

This was masked by the transcript-parsing bug fixed in the previous
commit: that bug deleted the state file on the first Stop in any
session, so neither session looped. Fixing it exposed the leak.

Fix: setup writes CLAUDE_CODE_SESSION_ID into the frontmatter; the hook
compares against .session_id from its stdin JSON and exits silently on
mismatch. State files without session_id (written by old setup scripts)
fall through to preserve existing behavior.
This commit is contained in:
sfishman
2026-03-02 22:36:12 +00:00
parent adfc379663
commit 8644df9ad5
2 changed files with 11 additions and 0 deletions
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10
plugins/ralph-loop/hooks/stop-hook.sh
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@@ -24,6 +24,16 @@ MAX_ITERATIONS=$(echo "$FRONTMATTER" | grep '^max_iterations:' | sed 's/max_iter
# Extract completion_promise and strip surrounding quotes if present
COMPLETION_PROMISE=$(echo "$FRONTMATTER" | grep '^completion_promise:' | sed 's/completion_promise: *//' | sed 's/^"\(.*\)"$/\1/')
# Session isolation: the state file is project-scoped, but the Stop hook
# fires in every Claude Code session in that project. If another session
# started the loop, this session must not block (or touch the state file).
# Legacy state files without session_id fall through (preserves old behavior).
STATE_SESSION=$(echo "$FRONTMATTER" | grep '^session_id:' | sed 's/session_id: *//' || true)
HOOK_SESSION=$(echo "$HOOK_INPUT" | jq -r '.session_id // ""')
if [[ -n "$STATE_SESSION" ]] && [[ "$STATE_SESSION" != "$HOOK_SESSION" ]]; then
exit 0
fi
# Validate numeric fields before arithmetic operations
if [[ ! "$ITERATION" =~ ^[0-9]+$ ]]; then
echo "⚠️ Ralph loop: State file corrupted" >&2