cursor:setup - Cursor Backend Setup

Cursor backend の setup / verification 用 skill。配布 plugin の fallback は claude のままにし、現在の repo / user 環境だけ cursor default にする時に使う。

Quick Reference

cursor:setup --check
cursor:setup --user-default
cursor:setup --project-default
cursor:setup --unset

Rules

• Do not change distribution defaults or plugin manifests to make Cursor the shipped fallback.
• Use scripts/resolve-impl-backend.sh / scripts/set-impl-backend.sh; do not infer from HARNESS_IMPL_BACKEND alone.
• Treat ~/.cursor/permissions.json, .cursorignore, and Claude sandbox allowlists as manual/user-owned setup surfaces unless the user explicitly asks to edit a local file.

Flow

First resolve the Harness helper root. Keep the current working directory as the target project so project-scoped env.local writes still land in the user's repo:

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

1. For --check, run:

   bash "${HARNESS_PLUGIN_ROOT}/scripts/setup-cursor.sh" --check
   bash "${HARNESS_PLUGIN_ROOT}/scripts/set-impl-backend.sh" --show
   bash "${HARNESS_PLUGIN_ROOT}/scripts/resolve-impl-backend.sh" --role worker
   CURSOR_AGENT_BIN="${CURSOR_AGENT_BIN:-}"
   if [ -z "$CURSOR_AGENT_BIN" ]; then
     # `agent`（公式の新表記）→ `cursor-agent`（legacy alias）の順に探す。
     # `agent` は汎用的な名前なので、symlink 解決後の実パスの「成分」に
     # cursor-agent が完全一致で現れる場合だけ採用する（部分文字列一致だと
     # /x/cursor-agent-not-really/agent のようなディレクトリ名で突破される）。
     for _c in agent cursor-agent; do
       _p="$(command -v "$_c" 2>/dev/null)" || continue
       [ -n "$_p" ] || continue
       _r="$(realpath "$_p" 2>/dev/null || readlink -f "$_p" 2>/dev/null || echo "$_p")"
       case "/$_r/" in */cursor-agent/*) CURSOR_AGENT_BIN="$_p"; break ;; esac
     done
     if [ -z "$CURSOR_AGENT_BIN" ] && [ -x "$HOME/.local/bin/cursor-agent" ]; then
       CURSOR_AGENT_BIN="$HOME/.local/bin/cursor-agent"
     fi
   fi
   if [ -z "$CURSOR_AGENT_BIN" ]; then
     echo "ERROR: cursor-agent not found in PATH or $HOME/.local/bin" >&2
     exit 3
   fi
   "$CURSOR_AGENT_BIN" --version

2. For --user-default, run:

   bash "${HARNESS_PLUGIN_ROOT}/scripts/set-impl-backend.sh" --user cursor
   bash "${HARNESS_PLUGIN_ROOT}/scripts/set-impl-backend.sh" --show

3. For --project-default, run:

   bash "${HARNESS_PLUGIN_ROOT}/scripts/set-impl-backend.sh" cursor
   bash "${HARNESS_PLUGIN_ROOT}/scripts/set-impl-backend.sh" --show

4. For --unset, ask whether the target is user or project scope if not clear from the request, then run exactly one matching unset command:

   Project scope:

   bash "${HARNESS_PLUGIN_ROOT}/scripts/set-impl-backend.sh" --unset

   User scope:

   bash "${HARNESS_PLUGIN_ROOT}/scripts/set-impl-backend.sh" --unset --user

Output

Report three facts only:

• resolved backend (claude / codex / cursor)
• Cursor package readiness (setup-cursor.sh --check)
• next manual step if Cursor is not ready