diff --git a/src/StaticPHP/Command/Dev/DumpStagesCommand.php b/src/StaticPHP/Command/Dev/DumpStagesCommand.php
new file mode 100644
index 00000000..4b20fe21
--- /dev/null
+++ b/src/StaticPHP/Command/Dev/DumpStagesCommand.php
@@ -0,0 +1,157 @@
+<?php
+
+declare(strict_types=1);
+
+namespace StaticPHP\Command\Dev;
+
+use StaticPHP\Command\BaseCommand;
+use StaticPHP\Registry\PackageLoader;
+use Symfony\Component\Console\Attribute\AsCommand;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputOption;
+
+#[AsCommand('dev:dump-stages', 'Dump all package stages with their file locations for quick indexing')]
+class DumpStagesCommand extends BaseCommand
+{
+    protected bool $no_motd = true;
+
+    public function configure(): void
+    {
+        $this->addArgument('packages', InputArgument::OPTIONAL, 'Comma-separated list of packages to dump, e.g. "openssl,zlib,curl". Dumps all packages if omitted.');
+        $this->addArgument('output', InputArgument::OPTIONAL, 'Output file path', ROOT_DIR . '/dump-stages.json');
+        $this->addOption('relative', 'r', InputOption::VALUE_NONE, 'Output file paths relative to ROOT_DIR');
+    }
+
+    public function handle(): int
+    {
+        $outputFile = $this->getArgument('output');
+        $useRelative = (bool) $this->getOption('relative');
+
+        $filterPackages = null;
+        if ($packagesArg = $this->getArgument('packages')) {
+            $filterPackages = array_flip(parse_comma_list($packagesArg));
+        }
+
+        $result = [];
+
+        foreach (PackageLoader::getPackages() as $name => $pkg) {
+            if ($filterPackages !== null && !isset($filterPackages[$name])) {
+                continue;
+            }
+            $entry = [
+                'type' => $pkg->getType(),
+                'stages' => [],
+                'before_stages' => [],
+                'after_stages' => [],
+            ];
+
+            // Resolve main stages
+            foreach ($pkg->getStages() as $stageName => $callable) {
+                $location = $this->resolveCallableLocation($callable);
+                if ($location !== null && $useRelative) {
+                    $location['file'] = $this->toRelativePath($location['file']);
+                }
+                $entry['stages'][$stageName] = $location;
+            }
+
+            $result[$name] = $entry;
+        }
+
+        // Resolve before/after stage external callbacks
+        foreach (PackageLoader::getAllBeforeStages() as $pkgName => $stages) {
+            if ($filterPackages !== null && !isset($filterPackages[$pkgName])) {
+                continue;
+            }
+            foreach ($stages as $stageName => $callbacks) {
+                foreach ($callbacks as [$callable, $onlyWhen]) {
+                    $location = $this->resolveCallableLocation($callable);
+                    if ($location !== null && $useRelative) {
+                        $location['file'] = $this->toRelativePath($location['file']);
+                    }
+                    $entry_data = $location ?? [];
+                    if ($onlyWhen !== null) {
+                        $entry_data['only_when_package_resolved'] = $onlyWhen;
+                    }
+                    $result[$pkgName]['before_stages'][$stageName][] = $entry_data;
+                }
+            }
+        }
+
+        foreach (PackageLoader::getAllAfterStages() as $pkgName => $stages) {
+            if ($filterPackages !== null && !isset($filterPackages[$pkgName])) {
+                continue;
+            }
+            foreach ($stages as $stageName => $callbacks) {
+                foreach ($callbacks as [$callable, $onlyWhen]) {
+                    $location = $this->resolveCallableLocation($callable);
+                    if ($location !== null && $useRelative) {
+                        $location['file'] = $this->toRelativePath($location['file']);
+                    }
+                    $entry_data = $location ?? [];
+                    if ($onlyWhen !== null) {
+                        $entry_data['only_when_package_resolved'] = $onlyWhen;
+                    }
+                    $result[$pkgName]['after_stages'][$stageName][] = $entry_data;
+                }
+            }
+        }
+
+        $json = json_encode($result, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
+        file_put_contents($outputFile, $json . PHP_EOL);
+
+        $this->output->writeln('<info>Dumped stages for ' . count($result) . " package(s) to: {$outputFile}</info>");
+        return static::SUCCESS;
+    }
+
+    /**
+     * Resolve the file, start line, class and method name of a callable using reflection.
+     *
+     * @return null|array{file: string, line: false|int, class: string, method: string}
+     */
+    private function resolveCallableLocation(mixed $callable): ?array
+    {
+        try {
+            if (is_array($callable) && count($callable) === 2) {
+                $ref = new \ReflectionMethod($callable[0], $callable[1]);
+                return [
+                    'class' => $ref->getDeclaringClass()->getName(),
+                    'method' => $ref->getName(),
+                    'file' => (string) $ref->getFileName(),
+                    'line' => $ref->getStartLine(),
+                ];
+            }
+            if ($callable instanceof \Closure) {
+                $ref = new \ReflectionFunction($callable);
+                $scopeClass = $ref->getClosureScopeClass();
+                return [
+                    'class' => $scopeClass !== null ? $scopeClass->getName() : '{closure}',
+                    'method' => '{closure}',
+                    'file' => (string) $ref->getFileName(),
+                    'line' => $ref->getStartLine(),
+                ];
+            }
+            if (is_string($callable) && str_contains($callable, '::')) {
+                [$class, $method] = explode('::', $callable, 2);
+                $ref = new \ReflectionMethod($class, $method);
+                return [
+                    'class' => $ref->getDeclaringClass()->getName(),
+                    'method' => $ref->getName(),
+                    'file' => (string) $ref->getFileName(),
+                    'line' => $ref->getStartLine(),
+                ];
+            }
+        } catch (\ReflectionException) {
+            // ignore
+        }
+        return null;
+    }
+
+    private function toRelativePath(string $absolutePath): string
+    {
+        $root = rtrim(ROOT_DIR, '/') . '/';
+        if (str_starts_with($absolutePath, $root)) {
+            return substr($absolutePath, strlen($root));
+        }
+        return $absolutePath;
+    }
+}
diff --git a/src/StaticPHP/ConsoleApplication.php b/src/StaticPHP/ConsoleApplication.php
index 8608f761..4afa221c 100644
--- a/src/StaticPHP/ConsoleApplication.php
+++ b/src/StaticPHP/ConsoleApplication.php
@@ -6,6 +6,7 @@ namespace StaticPHP;
 
 use StaticPHP\Command\BuildLibsCommand;
 use StaticPHP\Command\BuildTargetCommand;
+use StaticPHP\Command\Dev\DumpStagesCommand;
 use StaticPHP\Command\Dev\EnvCommand;
 use StaticPHP\Command\Dev\IsInstalledCommand;
 use StaticPHP\Command\Dev\LintConfigCommand;
@@ -67,6 +68,7 @@ class ConsoleApplication extends Application
             new EnvCommand(),
             new LintConfigCommand(),
             new PackLibCommand(),
+            new DumpStagesCommand(),
         ]);
 
         // add additional commands from registries
diff --git a/src/StaticPHP/Package/Package.php b/src/StaticPHP/Package/Package.php
index 64b9f2e4..fd59e98b 100644
--- a/src/StaticPHP/Package/Package.php
+++ b/src/StaticPHP/Package/Package.php
@@ -128,6 +128,16 @@ abstract class Package
         $this->stages[$name] = $stage;
     }
 
+    /**
+     * Get all defined stages for this package.
+     *
+     * @return array<string, callable>
+     */
+    public function getStages(): array
+    {
+        return $this->stages;
+    }
+
     /**
      * Check if the package has a specific stage defined.
      *
diff --git a/src/StaticPHP/Registry/PackageLoader.php b/src/StaticPHP/Registry/PackageLoader.php
index ca195ff0..573ad7da 100644
--- a/src/StaticPHP/Registry/PackageLoader.php
+++ b/src/StaticPHP/Registry/PackageLoader.php
@@ -240,6 +240,26 @@ class PackageLoader
         }
     }
 
+    /**
+     * Get all registered before-stage callbacks (raw).
+     *
+     * @return array<string, array<string, list<array{0: callable, 1: ?string}>>>
+     */
+    public static function getAllBeforeStages(): array
+    {
+        return self::$before_stages;
+    }
+
+    /**
+     * Get all registered after-stage callbacks (raw).
+     *
+     * @return array<string, array<string, list<array{0: callable, 1: ?string}>>>
+     */
+    public static function getAllAfterStages(): array
+    {
+        return self::$after_stages;
+    }
+
     public static function getBeforeStageCallbacks(string $package_name, string $stage): iterable
     {
         // match condition