cursor-rescue

name	cursor-rescue
description	Diagnose and recover Cursor backend failures for Harness workflows. Use when user invokes cursor:rescue, Cursor delegation fails, cursor-agent is missing, setup-cursor fails, or backend resolution unexpectedly falls back to claude.

cursor:rescue - Cursor Backend Recovery

Cursor backend の failure path を短く切り分ける skill。変更は最小限にし、破壊的操作はしない。

Quick Reference

cursor:rescue "breezing fell back to claude"
cursor:rescue "cursor-agent not found"

Diagnosis Order

Run one compact diagnostic block:

set +e
HARNESS_PLUGIN_ROOT="${HARNESS_PLUGIN_ROOT:-${CLAUDE_PLUGIN_ROOT:-}}"
if [ -z "$HARNESS_PLUGIN_ROOT" ] && [ -n "${CLAUDE_SKILL_DIR:-}" ]; then
  probe="$(cd "${CLAUDE_SKILL_DIR}" && pwd)"
  while [ "$probe" != "/" ] && [ ! -d "$probe/scripts" ]; do
    probe="$(cd "$probe/.." && pwd)"
  done
  [ -d "$probe/scripts" ] && HARNESS_PLUGIN_ROOT="$probe"
fi
if [ -z "$HARNESS_PLUGIN_ROOT" ]; then
  echo "ERROR: HARNESS_PLUGIN_ROOT is not set and could not be derived from CLAUDE_PLUGIN_ROOT or CLAUDE_SKILL_DIR" >&2
  exit 2
fi
echo "==RESOLVED_BACKEND=="
bash "${HARNESS_PLUGIN_ROOT}/scripts/resolve-impl-backend.sh" --role worker
echo "==USER_OR_PROJECT_DEFAULT=="
bash "${HARNESS_PLUGIN_ROOT}/scripts/set-impl-backend.sh" --show
echo "==CURSOR_MODEL=="
bash "${HARNESS_PLUGIN_ROOT}/scripts/model-routing.sh" --host cursor --role worker --field model
echo "==CURSOR_AGENT=="
CURSOR_AGENT_BIN="${CURSOR_AGENT_BIN:-}"
if [ -z "$CURSOR_AGENT_BIN" ]; then
  if command -v cursor-agent >/dev/null 2>&1; then
    CURSOR_AGENT_BIN="$(command -v cursor-agent)"
  elif [ -x "$HOME/.local/bin/cursor-agent" ]; then
    CURSOR_AGENT_BIN="$HOME/.local/bin/cursor-agent"
  fi
fi
if [ -z "$CURSOR_AGENT_BIN" ]; then
  echo "NOT_INSTALLED: cursor-agent not found in PATH or $HOME/.local/bin"
else
  "$CURSOR_AGENT_BIN" --version
fi
echo "==CURSOR_PACKAGE_CHECK=="
bash "${HARNESS_PLUGIN_ROOT}/scripts/setup-cursor.sh" --check

Common Fixes

Symptom	Fix
cursor-agent missing	Install / sign in to Cursor CLI, then rerun cursor:setup --check.
backend resolves to claude unexpectedly	Run bash scripts/set-impl-backend.sh --show; set user default with cursor:setup --user-default or project default with cursor:setup --project-default.
setup-cursor.sh --check fails	Report the first failing [ERR] line and the missing file path.
companion exits 2	Workspace guard or forbidden path. Recreate an isolated worktree and retry.
companion exits 3	cursor-agent not found in PATH or $HOME/.local/bin.

Output

Return:

• root cause candidate
• exact failing command
• minimal fix command
• whether retrying the original workflow is safe