diff --git a/README.ko.md b/README.ko.md
index 1db2070..00d0362 100644
--- a/README.ko.md
+++ b/README.ko.md
@@ -38,6 +38,17 @@ GitHub CLI 확장 프로그램 - LLM을 위한 GitHub 도구
 gh extension install pleaseai/gh-please
 ```
 
+**CI / Docker (인증 불필요):** `gh extension install`은 GitHub API를 사용하는데,
+비인증 요청의 속도 제한(IP당 시간당 60회)은 공유 CI 러너에서 쉽게 소진되어 gh가
+`HTTP 403`을 인증 오류처럼 표시합니다. 공개 릴리스 CDN에서 토큰 없이 바이너리를
+내려받는 독립 설치 스크립트를 사용하세요:
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/pleaseai/gh-please/main/scripts/install.sh | bash
+```
+
+> CI에서 `gh extension install`을 그대로 쓰려면 `GH_TOKEN`(GitHub Actions의 경우 `${{ github.token }}`)을 설정해 속도 제한을 해제하세요.
+
 ### 5분 안에 시작하기
 
 ```bash
diff --git a/README.md b/README.md
index f137c43..6134cd4 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,18 @@ English | [한국어](./README.ko.md)
 gh extension install pleaseai/gh-please
 ```
 
+**CI / Docker (no authentication needed):** `gh extension install` uses the GitHub
+API, whose unauthenticated rate limit (60 req/hour per IP) is easily exhausted on
+shared CI runners — gh then reports the `HTTP 403` as an auth error. Use the
+standalone installer, which downloads the binary from the public release CDN with
+no token:
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/pleaseai/gh-please/main/scripts/install.sh | bash
+```
+
+> Prefer `gh extension install` in CI? Set `GH_TOKEN` (e.g. `${{ github.token }}` in GitHub Actions) to lift the rate limit.
+
 ### Get Started in 5 Minutes
 
 ```bash
diff --git a/docs/content/en/1.guide/1.getting-started.md b/docs/content/en/1.guide/1.getting-started.md
index 3e893b0..1dbc4c3 100644
--- a/docs/content/en/1.guide/1.getting-started.md
+++ b/docs/content/en/1.guide/1.getting-started.md
@@ -20,6 +20,30 @@ Before installing `gh-please`, make sure you have:
 gh extension install pleaseai/gh-please
 ```
 
+### Install in CI / Docker (no authentication)
+
+`gh extension install` works fine on a personal machine, but in CI or during a
+Docker build it talks to the GitHub API, whose **unauthenticated** rate limit
+(60 requests/hour per IP) is shared across runners and is easily exhausted —
+gh then reports the resulting `HTTP 403` as an authentication error.
+
+Use the standalone installer instead. It downloads the precompiled binary from
+the public release CDN, so it needs **no token** and bakes no secret into your
+image:
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/pleaseai/gh-please/main/scripts/install.sh | bash
+
+# Pin a specific version (reproducible builds) — pin the script and the binary to the same tag:
+TAG=github-v0.32.0
+curl -fsSL "https://raw.githubusercontent.com/pleaseai/gh-please/${TAG}/scripts/install.sh" | bash -s -- --version "${TAG}"
+```
+
+::callout{type="info"}
+Prefer `gh extension install` in CI? Provide a token to lift the rate limit — in
+GitHub Actions set `env: { GH_TOKEN: ${{ github.token }} }`.
+::
+
 ### Install for Development
 
 ```bash
diff --git a/docs/content/ko/1.guide/1.getting-started.md b/docs/content/ko/1.guide/1.getting-started.md
index c2fb905..12f9ed8 100644
--- a/docs/content/ko/1.guide/1.getting-started.md
+++ b/docs/content/ko/1.guide/1.getting-started.md
@@ -20,6 +20,31 @@ description: gh-please 확장 프로그램 설치 및 설정
 gh extension install pleaseai/gh-please
 ```
 
+### CI / Docker에서 설치 (인증 불필요)
+
+`gh extension install`은 개인 PC에서는 잘 동작하지만, CI나 Docker 빌드에서는
+GitHub API를 호출합니다. **비인증** 요청의 속도 제한(IP당 시간당 60회)은 러너
+간에 공유되어 쉽게 소진되며, 이때 발생하는 `HTTP 403`을 gh가 인증 오류처럼
+표시합니다.
+
+이 경우 독립 설치 스크립트를 사용하세요. 공개 릴리스 CDN에서 사전 컴파일된
+바이너리를 내려받으므로 **토큰이 필요 없고** 이미지에 비밀값을 넣지 않아도
+됩니다:
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/pleaseai/gh-please/main/scripts/install.sh | bash
+
+# 특정 버전 고정 (재현 가능한 빌드) — 스크립트와 바이너리를 같은 태그로 고정:
+TAG=github-v0.32.0
+curl -fsSL "https://raw.githubusercontent.com/pleaseai/gh-please/${TAG}/scripts/install.sh" | bash -s -- --version "${TAG}"
+```
+
+::callout{type="info"}
+CI에서 `gh extension install`을 그대로 쓰고 싶다면 토큰을 제공해 속도 제한을
+해제하세요. GitHub Actions에서는 `env: { GH_TOKEN: ${{ github.token }} }`로
+설정합니다.
+::
+
 ### 개발용 설치
 
 ```bash
diff --git a/scripts/install.sh b/scripts/install.sh
new file mode 100755
index 0000000..8c1007d
--- /dev/null
+++ b/scripts/install.sh
@@ -0,0 +1,205 @@
+#!/usr/bin/env bash
+#
+# Auth-free installer for the gh-please GitHub CLI extension.
+#
+# Why this exists:
+#   `gh extension install pleaseai/gh-please` works without authentication for
+#   a single machine, but in CI/Docker the *unauthenticated* GitHub API rate
+#   limit (60 req/hour per IP) is quickly exhausted on shared runner IPs. gh
+#   then surfaces the resulting HTTP 403 as an authentication-looking error.
+#
+#   This script bypasses api.github.com entirely. It resolves the release tag
+#   via the public `releases/latest` web redirect and downloads the precompiled
+#   binary from GitHub's release-download CDN. Neither endpoint is rate-limited
+#   like the API nor requires a token, so it works at Docker build time with no
+#   credentials baked into the image.
+#
+# Usage:
+#   curl -fsSL https://raw.githubusercontent.com/pleaseai/gh-please/main/scripts/install.sh | bash
+#   curl -fsSL .../install.sh | bash -s -- --version github-v0.32.0   # pin a version
+#
+# Environment overrides:
+#   GH_PLEASE_VERSION   Pin a release tag (same as --version).
+
+set -euo pipefail
+
+# --- Constants ---------------------------------------------------------------
+readonly OWNER="pleaseai"
+readonly REPO="gh-please"
+readonly EXT_NAME="gh-please"   # gh extension name -> `gh please`
+readonly BIN_NAME="gh-please"   # executable + release asset prefix
+readonly HOST="github.com"
+readonly RELEASES_URL="https://github.com/${OWNER}/${REPO}/releases"
+
+# --- Output helpers ----------------------------------------------------------
+# Only emit ANSI colors when stderr is a terminal. In CI/Docker (this script's
+# primary target) output is redirected to log files, where escape sequences would
+# show up as literal garbage.
+if [[ -t 2 ]]; then
+  RED='\033[0;31m'
+  GREEN='\033[0;32m'
+  YELLOW='\033[1;33m'
+  NC='\033[0m'
+else
+  RED=''
+  GREEN=''
+  YELLOW=''
+  NC=''
+fi
+
+# Temp paths cleaned up by the EXIT trap. Declared at file scope so the trap can
+# reference them after main()'s locals go out of scope. WORKDIR holds downloads;
+# STAGING holds the new extension copy until it is atomically moved into place.
+WORKDIR=""
+STAGING=""
+
+info() { printf '%b\n' "${YELLOW}==>${NC} $*"; }
+ok() { printf '%b\n' "${GREEN}✓${NC} $*"; }
+err() { printf '%b\n' "${RED}✗${NC} $*" >&2; }
+
+die() {
+  err "$*"
+  exit 1
+}
+
+# --- Platform detection ------------------------------------------------------
+# Maps `uname` output to the `{os}-{arch}` suffix used in release asset names.
+detect_platform() {
+  local os arch
+  case "$(uname -s)" in
+    Linux) os="linux" ;;
+    Darwin) os="darwin" ;;
+    *) die "Unsupported OS: $(uname -s). For Windows use 'gh extension install ${OWNER}/${REPO}'." ;;
+  esac
+
+  case "$(uname -m)" in
+    x86_64 | amd64) arch="amd64" ;;
+    arm64 | aarch64) arch="arm64" ;;
+    *) die "Unsupported architecture: $(uname -m)." ;;
+  esac
+
+  printf '%s-%s' "$os" "$arch"
+}
+
+# --- Tag resolution ----------------------------------------------------------
+# Resolves the latest tag from the `releases/latest` redirect (no API call).
+resolve_latest_tag() {
+  local redirect
+  redirect="$(curl -fsS -o /dev/null -w '%{redirect_url}' "${RELEASES_URL}/latest" || true)"
+  [[ -n "$redirect" ]] || die "Could not resolve the latest release tag from ${RELEASES_URL}/latest"
+  printf '%s' "${redirect##*/tag/}"
+}
+
+# --- Checksum verification ---------------------------------------------------
+sha256_of() {
+  if command -v sha256sum >/dev/null 2>&1; then
+    sha256sum "$1" | awk '{print $1}'
+  elif command -v shasum >/dev/null 2>&1; then
+    shasum -a 256 "$1" | awk '{print $1}'
+  else
+    die "Neither sha256sum nor shasum is available for checksum verification."
+  fi
+}
+
+verify_checksum() {
+  local binary="$1" checksums="$2" asset="$3"
+  local expected actual
+  expected="$(awk -v f="$asset" '$2 == f {print $1}' "$checksums")"
+  # Fail closed: a missing entry must abort, never silently install an unverified
+  # binary. The release workflow generates checksums for every gh-please_* asset,
+  # so an absent entry means asset-name drift or a corrupt/partial checksums file.
+  if [[ -z "$expected" ]]; then
+    die "No checksum entry found for ${asset} in checksums.txt — cannot verify binary integrity."
+  fi
+  actual="$(sha256_of "$binary")"
+  [[ "$expected" == "$actual" ]] || die "Checksum mismatch for ${asset} (expected ${expected}, got ${actual})."
+  ok "Checksum verified."
+}
+
+# --- gh data directory -------------------------------------------------------
+# Resolves the directory gh uses to store extensions (XDG data, not config).
+gh_extensions_dir() {
+  printf '%s/gh/extensions' "${XDG_DATA_HOME:-$HOME/.local/share}"
+}
+
+# Writes manifest.yml. The file location and the recorded `path` are separate so
+# the manifest can be staged in a temp dir while still pointing at the final path.
+write_manifest() {
+  local manifest_file="$1" install_path="$2" tag="$3" pinned="$4"
+  cat >"$manifest_file" <<EOF
+owner: ${OWNER}
+name: ${EXT_NAME}
+host: ${HOST}
+tag: ${tag}
+ispinned: ${pinned}
+path: ${install_path}
+EOF
+}
+
+# --- Main --------------------------------------------------------------------
+main() {
+  local version="${GH_PLEASE_VERSION:-}"
+  local pinned="false"
+
+  while [[ $# -gt 0 ]]; do
+    case "$1" in
+      --version)
+        [[ $# -ge 2 ]] || die "--version requires a tag argument."
+        version="$2"
+        shift 2
+        ;;
+      -h | --help)
+        printf 'Usage: install.sh [--version <tag>]\n'
+        exit 0
+        ;;
+      *) die "Unknown argument: $1" ;;
+    esac
+  done
+
+  command -v curl >/dev/null 2>&1 || die "curl is required but not installed."
+
+  local platform tag asset base binary checksums
+  platform="$(detect_platform)"
+
+  if [[ -n "$version" ]]; then
+    tag="$version"
+    pinned="true"
+  else
+    info "Resolving latest release..."
+    tag="$(resolve_latest_tag)"
+  fi
+
+  asset="${BIN_NAME}_${tag}_${platform}"
+  base="${RELEASES_URL}/download/${tag}"
+  info "Installing ${EXT_NAME} ${tag} (${platform})..."
+
+  WORKDIR="$(mktemp -d)"
+  trap 'rm -rf "${WORKDIR:-}" "${STAGING:-}"' EXIT
+
+  binary="${WORKDIR}/${BIN_NAME}"
+  checksums="${WORKDIR}/checksums.txt"
+
+  curl -fsSL -o "$binary" "${base}/${asset}" \
+    || die "Failed to download ${base}/${asset} (does the release have a ${platform} binary?)."
+  curl -fsSL -o "$checksums" "${base}/checksums.txt" \
+    || die "Failed to download checksums from ${base}/checksums.txt"
+
+  verify_checksum "$binary" "$checksums" "$asset"
+
+  # Stage the new copy fully, then swap it into place. This keeps any existing
+  # install intact if writing the binary or manifest fails partway through.
+  local dir
+  dir="$(gh_extensions_dir)/${EXT_NAME}"
+  STAGING="$(dirname "$dir")/.${EXT_NAME}.tmp.$$"
+  rm -rf "$STAGING"
+  mkdir -p "$STAGING"
+  install -m 0755 "$binary" "${STAGING}/${BIN_NAME}"
+  write_manifest "${STAGING}/manifest.yml" "${dir}/${BIN_NAME}" "$tag" "$pinned"
+  rm -rf "$dir"
+  mv "$STAGING" "$dir"
+
+  ok "Installed to ${dir}/${BIN_NAME}"
+  info "Run: gh please --version"
+}
+
+main "$@"