diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88f8337c..bc916eca 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how
 * fix(lint): match behavior of declare linter to checkdoc (#272)
 * fix(test): ERT test fails on Emacs 30+ (cc1f4e15b7b40b986ad1a93f6e40d121340598de)
 * fix(test): eask options should not be passed to buttercup (#281)
+* feat(core): Lazy install on required packages (#284)
 
 ## 0.10.x
 > Released Jun 13, 2024
diff --git a/docs/content/Development-API/_index.en.md b/docs/content/Development-API/_index.en.md
index 31d4bc95..20aeb244 100644
--- a/docs/content/Development-API/_index.en.md
+++ b/docs/content/Development-API/_index.en.md
@@ -249,7 +249,7 @@ Initialize packages for use.
 
 Scope that temporary makes archives available.
 
-`ARCHIVES` can either be a string or a list of strings.
+The argument `ARCHIVES` can either be a string or a list of strings.
 
 ```elisp
 (eask-with-archives "melpa"
@@ -260,6 +260,21 @@ Scope that temporary makes archives available.
 💡 This is handy when you need certain packages from certain archives.
 {{< /hint >}}
 
+## 🔍 Function: eask-archive-install-packages (`archives` `names`)
+
+Install packages with archives setup.
+
+The arugment `names` can be a symbol or list of symbols.
+
+```elisp
+(eask-archive-install-packages '("gnu" "melpa")
+                               'el2org)  ; accept list
+```
+
+{{< hint info >}}
+💡 This only installs packages if they are missing.
+{{< /hint >}}
+
 ## 🔍 Function: eask-package-desc (`name` &optional `current`)
 
 Build package descriptor for a package.
@@ -975,7 +990,7 @@ Return size of the current package.
 Create execution with the responsive message output.
 
 ```elisp
-(eask-with-progress 
+(eask-with-progress
   "Downloading files... "
   (eask-with-verbosity 'debug  ; Often used with `eask-with-verbosity'
     ;; Execute some operations..
diff --git a/docs/content/Development-API/_index.zh-tw.md b/docs/content/Development-API/_index.zh-tw.md
index a7b9cc7f..84397c7c 100644
--- a/docs/content/Development-API/_index.zh-tw.md
+++ b/docs/content/Development-API/_index.zh-tw.md
@@ -179,7 +179,7 @@ $ eask init
 💡 我們不經常呼叫它，因為我們不希望直接執行另一個命令！
 {{< /hint >}}
 
-## 🔍 Function: eask-import (`url`)
+## 🔍 函式: eask-import (`url`)
 
 從 url 載入並評估腳本。
 
@@ -246,7 +246,7 @@ $ eask init
 
 臨時使存檔可用的範圍。
 
-`ARCHIVES` 可以是字符串或字符串列表。
+參數 `archives` 可以是字串或字串列表。
 
 ```elisp
 (eask-with-archives "melpa"
@@ -254,7 +254,22 @@ $ eask init
 ```
 
 {{< hint info >}}
-💡 當您需要某些檔案中的某些包時，這很方便。
+💡 當您需要某些存檔中的特定套件時，這非常方便。
+{{< /hint >}}
+
+## 🔍 函式: eask-archive-install-packages (`archives` `names`)
+
+使用 archives 設定安裝套件。
+
+參數 `names` 可以是符號或符號列表。
+
+```elisp
+(eask-archive-install-packages '("gnu" "melpa")
+                               'el2org)  ; 接受列表
+```
+
+{{< hint info >}}
+💡 這只會在套件遺失時安裝套件。
 {{< /hint >}}
 
 ## 🔍 函式: eask-package-desc (`name` &optional `current`)
@@ -965,7 +980,7 @@ This will kill Emacs process.
 使用響應消息輸出創建執行。
 
 ```elisp
-(eask-with-progress 
+(eask-with-progress
   "檔案下載中s... "
   (eask-with-verbosity 'debug  ; 通常與 `eask-with-verbosity` 一起使用
     ;; 執行一些操作..
@@ -1011,6 +1026,6 @@ This will kill Emacs process.
 
 返回可能的包名稱。
 
-## 🔍 Function: eask-guess-entry-point ()
+## 🔍 函式: eask-guess-entry-point ()
 
 返回可能的包的入口點。
diff --git a/lisp/_prepare.el b/lisp/_prepare.el
index 55765a33..73275280 100644
--- a/lisp/_prepare.el
+++ b/lisp/_prepare.el
@@ -569,8 +569,8 @@ scope of the dependencies (it's either `production' or `development')."
   (eask-defvc< 27 (eask-pkg-init))  ; XXX: remove this after we drop 26.x
   (when eask-depends-on-recipe-p
     (eask-log "Installing required external packages...")
-    (eask-with-archives '("gnu" "melpa")
-      (eask-package-install 'package-build))
+    (eask-archive-install-packages '("gnu" "melpa")
+                                   'package-build)
     (eask-with-progress
       "Building temporary archives (this may take a while)... "
       (eask-with-verbosity 'debug (github-elpa-build))
@@ -656,6 +656,14 @@ Argument BODY are forms for execution."
          "done ✓"))
      ,@body))
 
+(defun eask-archive-install-packages (archives names)
+  "Install package NAMES with ARCHIVES setup."
+  (eask-defvc< 27 (eask-pkg-init))  ; XXX: remove this after we drop 26.x
+  (when-let* ((names (eask-listify names))
+              ((cl-some (lambda (pkg) (not (package-installed-p pkg))) names)))
+    (eask-with-archives archives
+      (eask--package-mapc #'eask-package-install names))))
+
 (defun eask-package-installable-p (pkg)
   "Return non-nil if package (PKG) is installable."
   (assq (eask-intern pkg) package-archive-contents))
diff --git a/lisp/core/cat.el b/lisp/core/cat.el
index ab5938a9..6640f9e7 100644
--- a/lisp/core/cat.el
+++ b/lisp/core/cat.el
@@ -25,8 +25,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives "melpa"
-    (eask-package-install 'e2ansi))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'e2ansi)
   (eask-msg "")
 
   ;; Start the task
diff --git a/lisp/core/docs.el b/lisp/core/docs.el
index 8bc8de57..dd4cd83b 100644
--- a/lisp/core/docs.el
+++ b/lisp/core/docs.el
@@ -43,8 +43,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'el2org))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'el2org)
 
   ;; Start building...
   (require 'el2org)
diff --git a/lisp/core/loc.el b/lisp/core/loc.el
index a19455cb..62c82cd7 100644
--- a/lisp/core/loc.el
+++ b/lisp/core/loc.el
@@ -36,14 +36,14 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'markdown-mode))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'markdown-mode)
 
   (require 'markdown-mode)
   ;; Start LOC
   (if-let* ((files (or (eask-expand-file-specs (eask-args))
                        (eask-package-files)))
-           (eask-output (get-buffer-create "*eask-output*")))
+            (eask-output (get-buffer-create "*eask-output*")))
       (with-current-buffer eask-output
         (erase-buffer)
         (progn  ; Print header
diff --git a/lisp/core/package.el b/lisp/core/package.el
index d5bb43ba..e10dc29a 100644
--- a/lisp/core/package.el
+++ b/lisp/core/package.el
@@ -74,8 +74,8 @@ Argument VERSION is a string represent the version number of this package."
     (ignore-errors (make-directory eask-dist-path t))
 
     (eask-defvc< 27 (eask-pkg-init))  ; XXX: remove this after we drop 26.x
-    (eask-with-archives '("gnu" "melpa")
-      (eask-package-install 'package-build))
+    (eask-archive-install-packages '("gnu" "melpa")
+                                   'package-build)
     (eask-load "extern/package-build")  ; override
 
     (let* ((version (eask-package-version))
diff --git a/lisp/format/elfmt.el b/lisp/format/elfmt.el
index 234de463..5ac0f810 100644
--- a/lisp/format/elfmt.el
+++ b/lisp/format/elfmt.el
@@ -46,8 +46,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives '("gnu" "melpa" "jcs-elpa")
-    (eask-package-install 'elfmt))
+  (eask-archive-install-packages '("gnu" "melpa" "jcs-elpa")
+                                 'elfmt)
   (setq eask-format-elfmt--version (eask-package--version-string 'elfmt))
 
   ;; Start formatting
diff --git a/lisp/format/elisp-autofmt.el b/lisp/format/elisp-autofmt.el
index eedb2332..9a729c58 100644
--- a/lisp/format/elisp-autofmt.el
+++ b/lisp/format/elisp-autofmt.el
@@ -46,8 +46,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'elisp-autofmt))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'elisp-autofmt)
   (setq eask-format-elisp-autofmt--version (eask-package--version-string 'elisp-autofmt))
 
   ;; Start formatting
diff --git a/lisp/generate/ignore.el b/lisp/generate/ignore.el
index ff337b66..ece2c2c3 100644
--- a/lisp/generate/ignore.el
+++ b/lisp/generate/ignore.el
@@ -44,8 +44,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives "melpa"
-    (eask-package-install 'gitignore-templates))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'gitignore-templates)
 
   ;; Start the task
   (require 'gitignore-templates)
diff --git a/lisp/generate/license.el b/lisp/generate/license.el
index 5cd7ab8a..a9deffeb 100644
--- a/lisp/generate/license.el
+++ b/lisp/generate/license.el
@@ -48,8 +48,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives "melpa"
-    (eask-package-install 'license-templates))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'license-templates)
 
   ;; Start the task
   (require 'license-templates)
diff --git a/lisp/generate/test/buttercup.el b/lisp/generate/test/buttercup.el
index 6ef83ca1..3f3d726f 100644
--- a/lisp/generate/test/buttercup.el
+++ b/lisp/generate/test/buttercup.el
@@ -41,9 +41,8 @@
 " test-file name test-file))))))
 
 (eask-start
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'buttercup)
-    (eask-package-install 'f))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 '(buttercup f))
   (require 'buttercup)
   (require 'f)
   (eask-generate-test-buttercup--init (eask-guess-package-name)))
diff --git a/lisp/generate/test/ecukes.el b/lisp/generate/test/ecukes.el
index a03fabd5..f165df7b 100644
--- a/lisp/generate/test/ecukes.el
+++ b/lisp/generate/test/ecukes.el
@@ -15,8 +15,8 @@
         nil t))
 
 (eask-start
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'ecukes))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'ecukes)
   (require 'ecukes-new)
   (ecukes-new))
 
diff --git a/lisp/generate/test/ert-runner.el b/lisp/generate/test/ert-runner.el
index 645447da..6c113a77 100644
--- a/lisp/generate/test/ert-runner.el
+++ b/lisp/generate/test/ert-runner.el
@@ -31,8 +31,8 @@
 " name))))
 
 (eask-start
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'ert-runner))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'ert-runner)
   (advice-add 'ert-runner/run :override #'ignore)
   (load-library "ert-runner")
   (load-library "f")
diff --git a/lisp/init/cask.el b/lisp/init/cask.el
index 1d245372..4226277e 100644
--- a/lisp/init/cask.el
+++ b/lisp/init/cask.el
@@ -206,9 +206,8 @@ Optional argument CONTENTS is used for nested directives.  e.g. development."
 
 (eask-start
   ;; Preparation
-  (eask-with-archives `("gnu" "melpa" "jcs-elpa")
-    (eask-package-install 'package-build)
-    (eask-package-install 'cask))
+  (eask-archive-install-packages '("gnu" "melpa" "jcs-elpa")
+                                 '(package-build cask))
 
   ;; Start Converting
   (require 'cask)
diff --git a/lisp/init/eldev.el b/lisp/init/eldev.el
index 5363a3f8..8c6c5de3 100644
--- a/lisp/init/eldev.el
+++ b/lisp/init/eldev.el
@@ -77,8 +77,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives "melpa"
-    (eask-package-install 'eldev))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'eldev)
 
   ;; Start Converting
   (require 'eldev)
diff --git a/lisp/init/keg.el b/lisp/init/keg.el
index 03c7b323..1d2d455f 100644
--- a/lisp/init/keg.el
+++ b/lisp/init/keg.el
@@ -125,8 +125,8 @@ If no found the Keg file, returns nil."
 
 (eask-start
   ;; Preparation
-  (eask-with-archives "melpa"
-    (eask-package-install 'keg))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'keg)
 
   ;; Start Converting
   (require 'keg)
diff --git a/lisp/lint/elisp-lint.el b/lisp/lint/elisp-lint.el
index 9506761f..dc5de0b0 100644
--- a/lisp/lint/elisp-lint.el
+++ b/lisp/lint/elisp-lint.el
@@ -52,8 +52,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'elisp-lint))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'elisp-lint)
   (setq eask-lint-elisp-lint--version (eask-package--version-string 'elisp-lint))
 
   ;; Start Linting
diff --git a/lisp/lint/elsa.el b/lisp/lint/elsa.el
index b04dccbc..a3a19a16 100644
--- a/lisp/lint/elsa.el
+++ b/lisp/lint/elsa.el
@@ -60,8 +60,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'elsa))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'elsa)
   (setq eask-lint-elsa--version (eask-package--version-string 'elsa))
 
   ;; Start Linting
diff --git a/lisp/lint/package.el b/lisp/lint/package.el
index 866eb20f..3fdaa56a 100644
--- a/lisp/lint/package.el
+++ b/lisp/lint/package.el
@@ -59,8 +59,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'package-lint))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'package-lint)
   (setq eask-lint-package--version (eask-package--version-string 'package-lint))
 
   ;; Start Linting
diff --git a/lisp/lint/regexps.el b/lisp/lint/regexps.el
index a631d6e0..78d46b34 100644
--- a/lisp/lint/regexps.el
+++ b/lisp/lint/regexps.el
@@ -60,8 +60,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives "gnu"
-    (eask-package-install 'relint))
+  (eask-archive-install-packages '("gnu")
+                                 'relint)
   (setq eask-lint-regexps--relint-version (eask-package--version-string 'relint))
 
   ;; Start Linting
diff --git a/lisp/test/buttercup.el b/lisp/test/buttercup.el
index d403fd57..264a244e 100644
--- a/lisp/test/buttercup.el
+++ b/lisp/test/buttercup.el
@@ -16,8 +16,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'buttercup))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'buttercup)
 
   ;; Start Testing
   (require 'buttercup)
diff --git a/lisp/test/ecukes.el b/lisp/test/ecukes.el
index 2c096455..ebbc3e0b 100644
--- a/lisp/test/ecukes.el
+++ b/lisp/test/ecukes.el
@@ -29,8 +29,8 @@ Modified from function `ecukes-cli/run'."
 
 (eask-start
   ;; Preparation
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'ecukes))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'ecukes)
 
   ;; Start Testing
   (require 'ecukes)
diff --git a/lisp/test/ert-runner.el b/lisp/test/ert-runner.el
index 0019ff06..feb167d3 100644
--- a/lisp/test/ert-runner.el
+++ b/lisp/test/ert-runner.el
@@ -21,8 +21,8 @@
               (setq ert-runner-verbose t))))
 
 (eask-start
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'ert-runner))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 'ert-runner)
   (require 'ert-runner))
 
 ;;; test/ert-runner.el ends here
diff --git a/lisp/test/melpazoid.el b/lisp/test/melpazoid.el
index eb5bd9d8..85bbc23d 100644
--- a/lisp/test/melpazoid.el
+++ b/lisp/test/melpazoid.el
@@ -30,9 +30,8 @@
 
 (eask-start
   ;; Preparation
-  (eask-with-archives '("gnu" "melpa")
-    (eask-package-install 'package-lint)
-    (eask-package-install 'pkg-info))
+  (eask-archive-install-packages '("gnu" "melpa")
+                                 '(package-lint pkg-info))
 
   ;; Start Testing
   (let* ((dirs (or (eask-args) `(,default-directory))))