Fix #537: stop installing the deprecated tools package

Google no longer serves the `tools` package: it is gone from
repository2-3.xml, so `sdkmanager tools` fails with
"Failed to find package 'tools'" and takes the whole action down with it.

- Drop `tools` from the default value of the `packages` input, leaving
  `platform-tools`. The command line tools that replaced it are already
  installed by this action, and there is no bare `cmdline-tools` package
  path to install instead (only versioned ones, e.g. `cmdline-tools;20.0`).
- Skip `tools` with a warning when it is requested explicitly, so the
  many workflows that pass `packages: 'tools platform-tools'` keep working
  instead of failing.
- Update the README accordingly.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -5,7 +5,7 @@
 This action sets up the Android SDK tools by:
  - Downloading the SDK commandline tools, if the current version (16.0) is not found in either `$ANDROID_SDK_ROOT` or `$HOME/.android/sdk`.
  - Accepting the SDK licenses.
- - Installing `tools` and `platform-tools`.
+ - Installing `platform-tools`.
  - Adding `platform-tools` (contains adb) and `cmdline-tools/16.0/bin` (contains sdkmanager) to `$PATH`.
  - Setting up problem [matchers](/matchers.json).
 
@@ -41,7 +41,7 @@ steps:
 ## Additional packages
 Input parameter `packages` controls which packages this action will install from Android SDK.
 
-Default value is `tools platform-tools`, supply an empty string to skip installing additional packages.
+Default value is `platform-tools`, supply an empty string to skip installing additional packages.
 
 Additional packages can be installed at a later time by calling sdkmanager manually.
 
@@ -53,9 +53,33 @@ Additional packages can be installed at a later time by calling sdkmanager manua
 
 # ...
 
-- run: sdkmanager tools platform-tools
+- run: sdkmanager platform-tools
 ```
 
+## The deprecated `tools` package
+
+Google no longer serves the `tools` package, see [tools#tools-sdk](https://developer.android.com/tools#tools-sdk).
+Asking for it fails with `Failed to find package 'tools'`, so it is no longer part of the default value of `packages`.
+If it is requested explicitly, this action skips it with a warning rather than failing the build.
+
+Most of what `tools` provided now lives in the command line tools, which this action installs and adds to `$PATH`
+regardless of the `packages` input, so these need no install step at all:
+
+`apkanalyzer` `avdmanager` `lint` `screenshot2` `sdkmanager` `retrace` `resourceshrinker` `profgen` `d8` `r8`
+
+The emulator was split out of `tools` into its own package, request it explicitly if you need it:
+
+```yaml
+- name: Setup Android SDK
+  uses: android-actions/setup-android@v4
+  with:
+    packages: 'platform-tools emulator'
+```
+
+The remaining `tools` contents have no replacement in the current SDK: `android` was superseded by `sdkmanager` and
+`avdmanager`, ProGuard by [R8](https://developer.android.com/build/shrink-code), and `monitor`, `ddms`, `monkeyrunner`
+and `uiautomatorviewer` were dropped without one.
+
 ## SDK Version selection
 
 Command line tools are versioned using two variables - short and long.

action.yml

@@ -21,7 +21,7 @@ inputs:
   packages:
     description: 'Additional packages to install'
     required: false
-    default: 'tools platform-tools'
+    default: 'platform-tools'
 
 runs:
   using: node24

dist/index.js

@@ -22422,6 +22422,9 @@ function debug(message) {
 function error(message, properties = {}) {
   issueCommand("error", toCommandProperties(properties), message instanceof Error ? message.toString() : message);
 }
+function warning(message, properties = {}) {
+  issueCommand("warning", toCommandProperties(properties), message instanceof Error ? message.toString() : message);
+}
 function info(message) {
   process.stdout.write(message + os5.EOL);
 }
@@ -22814,6 +22817,12 @@ async function run() {
     return str.trim();
   }).filter(function(element, index, array) {
     return element;
+  }).filter(function(pkg) {
+    if (pkg === "tools") {
+      warning("Skipping deprecated package 'tools', it is no longer available in the Android SDK repository. The command line tools installed by this action replace it, see https://developer.android.com/tools#tools-sdk");
+      return false;
+    }
+    return true;
   });
   for (const pkg of packages) {
     await callSdkManager(sdkManagerExe, pkg);

src/main.ts

@@ -175,6 +175,19 @@ async function run(): Promise<void> {
     .filter(function (element, index, array) {
       return element
     })
+    .filter(function (pkg) {
+      // The 'tools' package is deprecated and no longer served by Google,
+      // asking sdkmanager for it fails the whole action.
+      // Its replacement, cmdline-tools, is already installed by this action.
+      if (pkg === 'tools') {
+        core.warning(
+          "Skipping deprecated package 'tools', it is no longer available in the Android SDK repository. " +
+            'The command line tools installed by this action replace it, see https://developer.android.com/tools#tools-sdk'
+        )
+        return false
+      }
+      return true
+    })
   for (const pkg of packages) {
     await callSdkManager(sdkManagerExe, pkg)
   }