diff --git a/src/Admin/DiviTab.php b/src/Admin/DiviTab.php
index 3fdff5d..f016240 100644
--- a/src/Admin/DiviTab.php
+++ b/src/Admin/DiviTab.php
@@ -225,6 +225,13 @@ final class DiviTab implements AdminTab
         if ($status->source === ReleaseStatus::SOURCE_CODE) {
             return __('Diese Version ist im Plugin als getestet hinterlegt.', 'wp-lit-mcp');
         }
+        if ($status->source === ReleaseStatus::SOURCE_AUTO) {
+            return __(
+                // phpcs:ignore Generic.Files.LineLength.TooLong -- WordPress.WP.I18n forbids splitting the text argument.
+                'Automatisch freigegeben: Alle Divi-Stellen, die LIT MCP nutzt, stimmen mit der geprüften Referenz überein.',
+                'wp-lit-mcp'
+            );
+        }
 
         $user = get_userdata((int) ($status->release['user_id'] ?? 0));
         $releasedAt = (int) strtotime((string) ($status->release['released_at'] ?? ''));
diff --git a/src/Integrations/Divi/Release/CompatibilityMatrix.php b/src/Integrations/Divi/Release/CompatibilityMatrix.php
new file mode 100644
index 0000000..424d658
--- /dev/null
+++ b/src/Integrations/Divi/Release/CompatibilityMatrix.php
@@ -0,0 +1,136 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Release;
+
+defined('ABSPATH') || exit;
+
+/**
+ * The release state of every Divi feature (E1). A feature the constructor did not get is incompatible (fail
+ * closed), so of() always answers. The overall state of the matrix is its worst feature state.
+ */
+final class CompatibilityMatrix
+{
+    public const MISSING = 'Für diese Fähigkeit liegt kein Prüfergebnis vor.';
+
+    /** @var array<string, FeatureStatus> keyed by DiviFeature value, in DiviFeature::cases() order */
+    private array $features = [];
+
+    /** @param array<string, FeatureStatus> $features keyed by DiviFeature value */
+    public function __construct(array $features)
+    {
+        foreach (DiviFeature::cases() as $feature) {
+            $status = $features[$feature->value] ?? null;
+            $this->features[$feature->value] = $status instanceof FeatureStatus && $status->feature === $feature
+                ? $status
+                : new FeatureStatus($feature, ReleaseState::Incompatible, [self::MISSING]);
+        }
+    }
+
+    public static function allReleased(string $source = ReleaseStatus::SOURCE_CODE): self
+    {
+        return self::uniform(ReleaseState::Released, [], $source);
+    }
+
+    public static function allIncompatible(string $problem): self
+    {
+        return self::uniform(ReleaseState::Incompatible, [$problem]);
+    }
+
+    /**
+     * Every feature in $state – the matrix of a status built without one (ReleaseStatus' constructor).
+     *
+     * @param list<string> $problems
+     */
+    public static function uniform(ReleaseState $state, array $problems = [], ?string $source = null): self
+    {
+        $released = $state === ReleaseState::Released;
+        $features = [];
+        foreach (DiviFeature::cases() as $feature) {
+            $features[$feature->value] = new FeatureStatus(
+                $feature,
+                $state,
+                $released ? [] : $problems,
+                $released ? ($source ?? ReleaseStatus::SOURCE_CODE) : null
+            );
+        }
+
+        return new self($features);
+    }
+
+    /** @return list<DiviFeature> The features that write (ReleaseGate::assertWritable(), ReleaseStatus::writable()). */
+    public static function writeFeatures(): array
+    {
+        return array_values(array_filter(
+            DiviFeature::cases(),
+            static fn (DiviFeature $feature): bool => $feature->isWrite()
+        ));
+    }
+
+    public function of(DiviFeature $feature): FeatureStatus
+    {
+        return $this->features[$feature->value];
+    }
+
+    /** @param list<DiviFeature> $features */
+    public function usable(array $features): bool
+    {
+        foreach ($features as $feature) {
+            if (! $this->of($feature)->usable()) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    /** @return list<FeatureStatus> */
+    public function unusable(): array
+    {
+        return array_values(array_filter(
+            $this->features,
+            static fn (FeatureStatus $status): bool => ! $status->usable()
+        ));
+    }
+
+    /** Incompatible before untested before released. */
+    public function state(): ReleaseState
+    {
+        $states = array_map(static fn (FeatureStatus $status): ReleaseState => $status->state, $this->features);
+
+        return match (true) {
+            in_array(ReleaseState::Incompatible, $states, true) => ReleaseState::Incompatible,
+            in_array(ReleaseState::Untested, $states, true) => ReleaseState::Untested,
+            default => ReleaseState::Released,
+        };
+    }
+
+    /** The common source of a fully released matrix; null when not all released or the sources differ. */
+    public function source(): ?string
+    {
+        $sources = array_unique(array_map(
+            static fn (FeatureStatus $status): string => (string) $status->source,
+            $this->features
+        ));
+
+        return $this->state() === ReleaseState::Released && count($sources) === 1 ? (string) reset($sources) : null;
+    }
+
+    /** @return list<string> Every problem label once, in feature order. */
+    public function problems(): array
+    {
+        $problems = [];
+        foreach ($this->features as $status) {
+            $problems = array_merge($problems, $status->problems);
+        }
+
+        return array_values(array_unique($problems));
+    }
+
+    /** @return list<array{id: string, label: string, state: string, problems: list<string>, source: ?string}> */
+    public function toArray(): array
+    {
+        return array_values(array_map(static fn (FeatureStatus $status): array => $status->toArray(), $this->features));
+    }
+}
diff --git a/src/Integrations/Divi/Release/FeatureStatus.php b/src/Integrations/Divi/Release/FeatureStatus.php
new file mode 100644
index 0000000..29b3775
--- /dev/null
+++ b/src/Integrations/Divi/Release/FeatureStatus.php
@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Release;
+
+defined('ABSPATH') || exit;
+
+/** The release state of one Divi feature (E1): released (with its source), untested or incompatible. */
+final class FeatureStatus
+{
+    /**
+     * @param list<string> $problems Labels of the problems behind the state (Problem::$label).
+     * @param string|null  $source   For a released feature: ReleaseStatus::SOURCE_CODE, SOURCE_DATABASE or
+     *                               SOURCE_AUTO; null otherwise.
+     */
+    public function __construct(
+        public readonly DiviFeature $feature,
+        public readonly ReleaseState $state,
+        public readonly array $problems = [],
+        public readonly ?string $source = null
+    ) {
+    }
+
+    public function usable(): bool
+    {
+        return $this->state === ReleaseState::Released;
+    }
+
+    /** @return array{id: string, label: string, state: string, problems: list<string>} For refusals (D6). */
+    public function summary(): array
+    {
+        return [
+            'id' => $this->feature->value,
+            'label' => $this->feature->label(),
+            'state' => $this->state->value,
+            'problems' => $this->problems,
+        ];
+    }
+
+    /**
+     * @return array{id: string, label: string, state: string, problems: list<string>, source: ?string}
+     *         For lit-site-status and the admin tab.
+     */
+    public function toArray(): array
+    {
+        return $this->summary() + ['source' => $this->source];
+    }
+}
diff --git a/src/Integrations/Divi/Release/ManifestCheck.php b/src/Integrations/Divi/Release/ManifestCheck.php
index f765077..a91fe1f 100644
--- a/src/Integrations/Divi/Release/ManifestCheck.php
+++ b/src/Integrations/Divi/Release/ManifestCheck.php
@@ -13,8 +13,9 @@ use Throwable;
 defined('ABSPATH') || exit;
 
 /**
- * The checks of all adapter manifests (spec §4.3), as label => check. Code checks (calls with the argument count
- * the adapter passes, constants) and mirror checks decide the release gate; registration checks (post types,
+ * The checks of all adapter manifests (spec §4.3), as label => check for reports, and as problems with their Divi
+ * features for the release matrix (problems(), E1). Code checks (calls with the argument count the adapter passes
+ * and their signature, constants) and mirror checks decide the release gate; registration checks (post types,
  * taxonomies, block types) depend on the request context (stage3 finding 6) and only show in reports.
  *
  * Not final so the resolver can be tested with a mock.
@@ -32,7 +33,8 @@ class ManifestCheck
 
     /**
      * @param array<string, Manifest>|null     $manifests  null = DiviAdapters::manifests().
-     * @param array<string, string>|null       $expected   Mirror ID => sha256; null = DiviReference::expected().
+     * @param array<string, string>|null       $expected   Mirror ID or "sig:<symbol>" => sha256;
+     *                                                     null = DiviReference::expected().
      * @param (Closure(Mirror): ?string)|null  $current    Hash of the installed mirror, null = unreadable;
      *                                                     null = SourceFingerprint in the Divi theme directory.
      * @param (Closure(string): bool)|null     $knowsBlock null = DiviModules::knowsBlock().
@@ -71,12 +73,7 @@ class ManifestCheck
         $checks = [];
         foreach ($this->manifests as $manifest) {
             foreach ($manifest->mirrors as $mirror) {
-                $label = sprintf('%s: Nachbau von %s – %s', $manifest->area, $mirror->label(), $mirror->what);
-                $checks[$label] = function () use ($mirror): bool {
-                    $expected = ($this->expected ??= DiviReference::expected())[$mirror->id] ?? null;
-
-                    return $expected !== null && ($this->current)($mirror) === $expected;
-                };
+                $checks[self::mirrorLabel($manifest, $mirror)] = fn (): bool => $this->matches($mirror);
             }
         }
 
@@ -111,12 +108,7 @@ class ManifestCheck
     {
         $failed = [];
         foreach ($checks as $label => $check) {
-            try {
-                $ok = (bool) $check();
-            } catch (Throwable) {
-                $ok = false;
-            }
-            if (! $ok) {
+            if (! self::passes($check)) {
                 $failed[] = (string) $label;
             }
         }
@@ -124,6 +116,67 @@ class ManifestCheck
         return $failed;
     }
 
+    /** @return list<Problem> Code and mirror problems with their features – what the release matrix is built of. */
+    public function problems(): array
+    {
+        return array_merge($this->codeProblems(), $this->mirrorProblems());
+    }
+
+    /**
+     * Calls (missing or other argument count: call; no reference: reference-missing; other signature: signature)
+     * and constants. Reflection only – cheap enough for every request.
+     *
+     * @return list<Problem>
+     */
+    public function codeProblems(): array
+    {
+        $problems = [];
+        foreach ($this->manifests as $manifest) {
+            foreach ($manifest->calls as $call) {
+                $problem = $this->callProblem($manifest, $call);
+                if ($problem !== null) {
+                    $problems[] = $problem;
+                }
+            }
+            foreach ($manifest->constants as $constant) {
+                if (! defined($constant->name)) {
+                    $problems[] = new Problem(
+                        $manifest->area . ': ' . $constant->label(),
+                        $manifest->featuresOf($constant),
+                        Problem::CONSTANT
+                    );
+                }
+            }
+        }
+
+        return $problems;
+    }
+
+    /**
+     * Mirrors that differ from their reference, cannot be read or have no reference – kind mirror in every case:
+     * a mirror repeats how Divi writes, so it never runs unverified, whatever the release. Reads Divi files; the
+     * resolver caches the result.
+     *
+     * @return list<Problem>
+     */
+    public function mirrorProblems(): array
+    {
+        $problems = [];
+        foreach ($this->manifests as $manifest) {
+            foreach ($manifest->mirrors as $mirror) {
+                if (! self::passes(fn (): bool => $this->matches($mirror))) {
+                    $problems[] = new Problem(
+                        self::mirrorLabel($manifest, $mirror),
+                        $manifest->featuresOf($mirror),
+                        Problem::MIRROR
+                    );
+                }
+            }
+        }
+
+        return $problems;
+    }
+
     /** The function or method exists and takes the number of arguments the adapter passes. */
     public static function accepts(Call $call): bool
     {
@@ -145,6 +198,53 @@ class ManifestCheck
                 && ($reflection->isVariadic() || $reflection->getNumberOfParameters() >= $call->args));
     }
 
+    private function callProblem(Manifest $manifest, Call $call): ?Problem
+    {
+        $label = $manifest->area . ': ' . $call->label();
+        $features = $manifest->featuresOf($call);
+        if (! self::passes(static fn (): bool => self::accepts($call))) {
+            return new Problem($label, $features, Problem::CALL);
+        }
+
+        $expected = $this->expected()[DiviReference::signatureKey($call)] ?? null;
+        if ($expected === null) {
+            return new Problem($label . ' – Referenz der Signatur fehlt', $features, Problem::REFERENCE_MISSING);
+        }
+
+        return self::passes(static fn (): bool => SignatureFingerprint::of($call) === $expected)
+            ? null
+            : new Problem($label . ' – Signatur geändert', $features, Problem::SIGNATURE);
+    }
+
+    /** The mirror's reference exists and the installed source has the same fingerprint. */
+    private function matches(Mirror $mirror): bool
+    {
+        $expected = $this->expected()[$mirror->id] ?? null;
+
+        return $expected !== null && ($this->current)($mirror) === $expected;
+    }
+
+    /** @return array<string, string> */
+    private function expected(): array
+    {
+        return $this->expected ??= DiviReference::expected();
+    }
+
+    private static function mirrorLabel(Manifest $manifest, Mirror $mirror): string
+    {
+        return sprintf('%s: Nachbau von %s – %s', $manifest->area, $mirror->label(), $mirror->what);
+    }
+
+    /** @param callable(): bool $check A check that throws failed. */
+    private static function passes(callable $check): bool
+    {
+        try {
+            return (bool) $check();
+        } catch (Throwable) {
+            return false;
+        }
+    }
+
     private static function installed(Mirror $mirror): ?string
     {
         $dir = DiviEnvironment::themeDir();
diff --git a/src/Integrations/Divi/Release/Problem.php b/src/Integrations/Divi/Release/Problem.php
new file mode 100644
index 0000000..438b831
--- /dev/null
+++ b/src/Integrations/Divi/Release/Problem.php
@@ -0,0 +1,90 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Release;
+
+defined('ABSPATH') || exit;
+
+/**
+ * One failed manifest check and the Divi features it concerns (Manifest::featuresOf()). The kind decides how the
+ * resolver weighs it (E1): call, mirror and constant lock their features for every Divi version, released or not;
+ * signature and reference-missing only matter for a version without release (automatic release). A problem without
+ * features concerns every feature (fail closed).
+ */
+final class Problem
+{
+    public const CALL = 'call';
+    public const SIGNATURE = 'signature';
+    public const MIRROR = 'mirror';
+    public const CONSTANT = 'constant';
+    public const REFERENCE_MISSING = 'reference-missing';
+    public const RESOLVER = 'resolver';
+
+    private const KINDS = [
+        self::CALL,
+        self::SIGNATURE,
+        self::MIRROR,
+        self::CONSTANT,
+        self::REFERENCE_MISSING,
+        self::RESOLVER,
+    ];
+    private const HARD = [self::CALL, self::MIRROR, self::CONSTANT, self::RESOLVER];
+
+    /**
+     * @param string            $label    German, e.g. "Seiten: et_x()" (the labels of ManifestCheck).
+     * @param list<DiviFeature> $features
+     * @param string            $kind     One of the constants above.
+     */
+    public function __construct(
+        public readonly string $label,
+        public readonly array $features,
+        public readonly string $kind
+    ) {
+    }
+
+    /** Locks its features whatever the release (the code no longer fits Divi or a mirror differs). */
+    public function isHard(): bool
+    {
+        return in_array($this->kind, self::HARD, true);
+    }
+
+    public function concerns(DiviFeature $feature): bool
+    {
+        return $this->features === [] || in_array($feature, $this->features, true);
+    }
+
+    /** @return array{label: string, kind: string, features: list<string>} For the transient. */
+    public function toArray(): array
+    {
+        return [
+            'label' => $this->label,
+            'kind' => $this->kind,
+            'features' => array_map(static fn (DiviFeature $feature): string => $feature->value, $this->features),
+        ];
+    }
+
+    /** The problem of toArray(), or null for anything else (an unknown kind or feature included). */
+    public static function fromArray(mixed $row): ?self
+    {
+        if (
+            ! is_array($row)
+            || ! is_string($row['label'] ?? null)
+            || ! in_array($row['kind'] ?? null, self::KINDS, true)
+            || ! is_array($row['features'] ?? null)
+        ) {
+            return null;
+        }
+
+        $features = [];
+        foreach ($row['features'] as $value) {
+            $feature = is_string($value) ? DiviFeature::tryFrom($value) : null;
+            if ($feature === null) {
+                return null;
+            }
+            $features[] = $feature;
+        }
+
+        return new self($row['label'], $features, $row['kind']);
+    }
+}
diff --git a/src/Integrations/Divi/Release/ReleaseGate.php b/src/Integrations/Divi/Release/ReleaseGate.php
index 3d21383..102a3c4 100644
--- a/src/Integrations/Divi/Release/ReleaseGate.php
+++ b/src/Integrations/Divi/Release/ReleaseGate.php
@@ -24,7 +24,9 @@ final class ReleaseGate
 
     private static ?int $probe = null;
 
-    /** Spec §9: a status that cannot be determined locks writes like an incompatible Divi (and is logged). */
+    private const UNRESOLVED = 'Der Freigabe-Zustand ließ sich nicht ermitteln (Details im PHP-Error-Log).';
+
+    /** Spec §9: a status that cannot be determined locks every feature as incompatible (and is logged). */
     public static function status(): ReleaseStatus
     {
         if (self::$status !== null) {
@@ -35,12 +37,7 @@ final class ReleaseGate
             self::$status = (self::$resolver ?? static fn (): ReleaseStatus => (new ReleaseResolver())->resolve())();
         } catch (Throwable $e) {
             Log::failure('divi release status', $e);
-            self::$status = new ReleaseStatus(
-                ReleaseState::Incompatible,
-                '',
-                null,
-                ['Der Freigabe-Zustand ließ sich nicht ermitteln (Details im PHP-Error-Log).']
-            );
+            self::$status = ReleaseStatus::of('', CompatibilityMatrix::allIncompatible(self::UNRESOLVED));
         }
 
         return self::$status;
diff --git a/src/Integrations/Divi/Release/ReleaseResolver.php b/src/Integrations/Divi/Release/ReleaseResolver.php
index 02b82f0..30eff1d 100644
--- a/src/Integrations/Divi/Release/ReleaseResolver.php
+++ b/src/Integrations/Divi/Release/ReleaseResolver.php
@@ -10,13 +10,24 @@ use LIT\MCP\Plugin;
 defined('ABSPATH') || exit;
 
 /**
- * Computes the release status (spec §5.2–§5.4): code checks live (cheap), mirror checks cached in a transient under
- * stateKey() – Divi version, plugin version, fingerprints.json and the modification times of the mirrored Divi
- * files, so a Divi update or hotfix is checked again at once.
+ * Computes the release status (spec §5.2–§5.4) as a matrix of Divi features (E1). Code and signature checks run
+ * live (Reflection, cheap; a hotfix without a new version number is seen at once), mirror checks are cached in a
+ * transient under stateKey() – Divi version, plugin version, fingerprints.json (mirror and signature references) and
+ * the modification times of the mirrored Divi files.
+ *
+ * Per feature: a hard problem (call, mirror, constant) makes it incompatible, released version or not. A released
+ * version (DiviReleases::TESTED, source code; ReleaseStore, source database) releases every other feature – its
+ * release covers signatures. Otherwise, with the automatic release on (filter lit_mcp_divi_auto_release, default
+ * true) and a known version: a changed signature makes the feature incompatible, a missing reference untested,
+ * no problem releases it (source auto). Without the automatic release every other feature is untested.
  */
 final class ReleaseResolver
 {
     public const CACHE = 'lit_mcp_divi_state';
+    public const AUTO_RELEASE_FILTER = 'lit_mcp_divi_auto_release';
+
+    /** Version of the transient's layout; an entry without it (the list of labels before) is a miss. */
+    private const CACHE_FORMAT = 2;
 
     /**
      * @param (Closure(): ?string)|null      $version  null = DiviEnvironment::version().
@@ -34,22 +45,17 @@ final class ReleaseResolver
     {
         $version = ($this->version ?? DiviEnvironment::version(...))() ?? '';
         $check = $this->check ?? new ManifestCheck();
-        $problems = array_merge(
-            ManifestCheck::failed($check->codeChecks()),
-            $this->mirrorProblems($check, $version)
-        );
+        $problems = array_merge($check->codeProblems(), $this->mirrorProblems($check, $version));
 
-        if ($problems !== []) {
-            return new ReleaseStatus(ReleaseState::Incompatible, $version, null, $problems);
-        }
         if (in_array($version, DiviReleases::TESTED, true)) {
-            return ReleaseStatus::released($version);
+            return ReleaseStatus::of($version, self::matrix($problems, ReleaseStatus::SOURCE_CODE, false));
+        }
+        $entry = $version === '' ? null : ($this->store ?? new ReleaseStore())->find($version, Plugin::VERSION);
+        if ($entry !== null) {
+            return ReleaseStatus::of($version, self::matrix($problems, ReleaseStatus::SOURCE_DATABASE, false), $entry);
         }
-        $entry = ($this->store ?? new ReleaseStore())->find($version, Plugin::VERSION);
 
-        return $entry !== null
-            ? new ReleaseStatus(ReleaseState::Released, $version, ReleaseStatus::SOURCE_DATABASE, [], $entry)
-            : new ReleaseStatus(ReleaseState::Untested, $version);
+        return ReleaseStatus::of($version, self::matrix($problems, null, $version !== '' && self::automatic()));
     }
 
     /** What the cached mirror results and a check report are valid for. */
@@ -69,17 +75,111 @@ final class ReleaseResolver
         return hash('sha256', implode('|', $parts));
     }
 
-    /** @return list<string> */
+    /** Only a literal true switches the automatic release on (fail closed). */
+    private static function automatic(): bool
+    {
+        return apply_filters(self::AUTO_RELEASE_FILTER, true) === true;
+    }
+
+    /**
+     * @param list<Problem> $problems
+     * @param string|null   $source    SOURCE_CODE or SOURCE_DATABASE for a released version, else null.
+     * @param bool          $automatic The automatic release applies (no release, known version, filter on).
+     */
+    private static function matrix(array $problems, ?string $source, bool $automatic): CompatibilityMatrix
+    {
+        $features = [];
+        foreach (DiviFeature::cases() as $feature) {
+            $concerning = array_values(array_filter(
+                $problems,
+                static fn (Problem $problem): bool => $problem->concerns($feature)
+            ));
+            $features[$feature->value] = self::feature($feature, $concerning, $source, $automatic);
+        }
+
+        return new CompatibilityMatrix($features);
+    }
+
+    /** @param list<Problem> $problems The problems concerning $feature. */
+    private static function feature(
+        DiviFeature $feature,
+        array $problems,
+        ?string $source,
+        bool $automatic
+    ): FeatureStatus {
+        $hard = array_filter($problems, static fn (Problem $problem): bool => $problem->isHard());
+        if ($hard !== []) {
+            return new FeatureStatus($feature, ReleaseState::Incompatible, self::labels($hard));
+        }
+        if ($source !== null) {
+            return new FeatureStatus($feature, ReleaseState::Released, [], $source);
+        }
+        if (! $automatic) {
+            return new FeatureStatus($feature, ReleaseState::Untested, self::labels($problems));
+        }
+
+        $changed = array_filter($problems, static fn (Problem $problem): bool => $problem->kind === Problem::SIGNATURE);
+        if ($changed !== []) {
+            return new FeatureStatus($feature, ReleaseState::Incompatible, self::labels($changed));
+        }
+
+        return $problems === []
+            ? new FeatureStatus($feature, ReleaseState::Released, [], ReleaseStatus::SOURCE_AUTO)
+            : new FeatureStatus($feature, ReleaseState::Untested, self::labels($problems));
+    }
+
+    /**
+     * @param array<int, Problem> $problems
+     * @return list<string>
+     */
+    private static function labels(array $problems): array
+    {
+        return array_values(array_map(static fn (Problem $problem): string => $problem->label, $problems));
+    }
+
+    /** @return list<Problem> */
     private function mirrorProblems(ManifestCheck $check, string $version): array
     {
         $key = ($this->stateKey ?? self::stateKey(...))($version);
-        $cached = get_transient(self::CACHE);
-        if (is_array($cached) && ($cached['key'] ?? null) === $key && is_array($cached['problems'] ?? null)) {
-            return array_values(array_filter($cached['problems'], 'is_string'));
+        $cached = self::cached(get_transient(self::CACHE), $key);
+        if ($cached !== null) {
+            return $cached;
         }
 
-        $problems = ManifestCheck::failed($check->mirrorChecks());
-        set_transient(self::CACHE, ['key' => $key, 'problems' => $problems], DAY_IN_SECONDS);
+        $problems = $check->mirrorProblems();
+        set_transient(
+            self::CACHE,
+            [
+                'format' => self::CACHE_FORMAT,
+                'key' => $key,
+                'problems' => array_map(static fn (Problem $problem): array => $problem->toArray(), $problems),
+            ],
+            DAY_IN_SECONDS
+        );
+
+        return $problems;
+    }
+
+    /** @return list<Problem>|null null = miss: none, another key, the old format or any unreadable row. */
+    private static function cached(mixed $entry, string $key): ?array
+    {
+        if (
+            ! is_array($entry)
+            || ($entry['format'] ?? null) !== self::CACHE_FORMAT
+            || ($entry['key'] ?? null) !== $key
+            || ! is_array($entry['problems'] ?? null)
+        ) {
+            return null;
+        }
+
+        $problems = [];
+        foreach ($entry['problems'] as $row) {
+            $problem = Problem::fromArray($row);
+            if ($problem === null) {
+                return null;
+            }
+            $problems[] = $problem;
+        }
 
         return $problems;
     }
diff --git a/src/Integrations/Divi/Release/ReleaseStatus.php b/src/Integrations/Divi/Release/ReleaseStatus.php
index 0cb6db0..54d7780 100644
--- a/src/Integrations/Divi/Release/ReleaseStatus.php
+++ b/src/Integrations/Divi/Release/ReleaseStatus.php
@@ -10,11 +10,15 @@ use WP_Error;
 
 defined('ABSPATH') || exit;
 
-/** Whether LIT MCP may write with the installed Divi (spec §5.2), with the texts of spec §5.6. */
+/**
+ * The release of the installed Divi (spec §5.2): the matrix of its features (E1) and, for callers that know no
+ * features, the overall state (the worst feature state) with every problem, and the texts of spec §5.6.
+ */
 final class ReleaseStatus
 {
     public const SOURCE_CODE = 'code';
     public const SOURCE_DATABASE = 'database';
+    public const SOURCE_AUTO = 'auto';
 
     private const UNTESTED = 'Achtung: %s ist auf dieser Website noch nicht für LIT MCP freigegeben. Schreibende '
         . 'Divi-Werkzeuge sind gesperrt, bis ein Administrator unter Einstellungen → LIT MCP → Divi die Prüfung '
@@ -27,19 +31,35 @@ final class ReleaseStatus
         . 'Divi-Werkzeuge funktionieren weiter.';
     private const NOTICE = 'Achtung: %s ist für LIT MCP %s; Lesen funktioniert, Schreiben ist gesperrt.';
 
+    public readonly CompatibilityMatrix $matrix;
+
     /**
+     * Without $matrix every feature is in $state (CompatibilityMatrix::uniform()); with one, use of().
+     *
      * @param string                    $version  Divi version, '' when unknown (Divi is not the active template).
-     * @param string|null               $source   SOURCE_CODE or SOURCE_DATABASE for a released version.
+     * @param string|null               $source   SOURCE_CODE, SOURCE_DATABASE or SOURCE_AUTO for a released version.
      * @param list<string>              $problems Failed code and mirror checks (ManifestCheck labels).
      * @param array<string, mixed>|null $release  The database entry of a SOURCE_DATABASE release.
+     * @throws LogicException When $matrix is in another state than $state.
      */
     public function __construct(
         public readonly ReleaseState $state,
         public readonly string $version,
         public readonly ?string $source = null,
         public readonly array $problems = [],
-        public readonly ?array $release = null
+        public readonly ?array $release = null,
+        ?CompatibilityMatrix $matrix = null
     ) {
+        if ($matrix !== null && $matrix->state() !== $state) {
+            throw new LogicException('the matrix is ' . $matrix->state()->value . ', not ' . $state->value);
+        }
+        $this->matrix = $matrix ?? CompatibilityMatrix::uniform($state, $problems, $source);
+    }
+
+    /** @param array<string, mixed>|null $release The database entry of a SOURCE_DATABASE release. */
+    public static function of(string $version, CompatibilityMatrix $matrix, ?array $release = null): self
+    {
+        return new self($matrix->state(), $version, $matrix->source(), $matrix->problems(), $release, $matrix);
     }
 
     public static function released(string $version, string $source = self::SOURCE_CODE): self
@@ -47,9 +67,10 @@ final class ReleaseStatus
         return new self(ReleaseState::Released, $version, $source);
     }
 
+    /** Every writing feature is usable – for callers that know no feature (DiviToolGate, DiviContentComposer). */
     public function writable(): bool
     {
-        return $this->state === ReleaseState::Released;
+        return $this->matrix->usable(CompatibilityMatrix::writeFeatures());
     }
 
     public function versionLabel(): string
diff --git a/tests/Support/ReleaseMatrices.php b/tests/Support/ReleaseMatrices.php
new file mode 100644
index 0000000..9225040
--- /dev/null
+++ b/tests/Support/ReleaseMatrices.php
@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Support;
+
+use LIT\MCP\Integrations\Divi\Release\CompatibilityMatrix;
+use LIT\MCP\Integrations\Divi\Release\DiviFeature;
+use LIT\MCP\Integrations\Divi\Release\FeatureStatus;
+use LIT\MCP\Integrations\Divi\Release\ReleaseState;
+use LIT\MCP\Integrations\Divi\Release\ReleaseStatus;
+
+/** Release statuses for tests: every feature released except the named ones. */
+final class ReleaseMatrices
+{
+    /** @param list<DiviFeature> $locked */
+    public static function matrix(array $locked, ReleaseState $state = ReleaseState::Untested): CompatibilityMatrix
+    {
+        $features = [];
+        foreach (DiviFeature::cases() as $feature) {
+            $features[$feature->value] = in_array($feature, $locked, true)
+                ? new FeatureStatus(
+                    $feature,
+                    $state,
+                    $state === ReleaseState::Incompatible ? ['Seiten: et_x() – Signatur geändert'] : []
+                )
+                : new FeatureStatus($feature, ReleaseState::Released, [], ReleaseStatus::SOURCE_CODE);
+        }
+
+        return new CompatibilityMatrix($features);
+    }
+
+    /** @param list<DiviFeature> $locked */
+    public static function status(
+        array $locked,
+        ReleaseState $state = ReleaseState::Untested,
+        string $version = '5.3.0'
+    ): ReleaseStatus {
+        return ReleaseStatus::of($version, self::matrix($locked, $state));
+    }
+}
diff --git a/tests/Unit/Admin/DiviTabTest.php b/tests/Unit/Admin/DiviTabTest.php
index d5e0ba4..22210fc 100644
--- a/tests/Unit/Admin/DiviTabTest.php
+++ b/tests/Unit/Admin/DiviTabTest.php
@@ -215,6 +215,15 @@ final class DiviTabTest extends TestCase
         self::assertStringNotContainsString('Freigabe zurückziehen', $html);
     }
 
+    public function testAnAutomaticReleaseSaysSoAndOffersNeitherReleaseNorWithdrawal(): void
+    {
+        $html = $this->rendered(ReleaseStatus::released('5.99.0', ReleaseStatus::SOURCE_AUTO), self::report());
+
+        self::assertStringContainsString('Automatisch freigegeben', $html);
+        self::assertStringNotContainsString('freigeben</button>', $html);
+        self::assertStringNotContainsString('Freigabe zurückziehen', $html);
+    }
+
     public function testADatabaseReleaseCanBeWithdrawn(): void
     {
         $status = new ReleaseStatus(ReleaseState::Released, '5.3.0', ReleaseStatus::SOURCE_DATABASE, [], [
diff --git a/tests/Unit/Integrations/Divi/Release/CompatibilityMatrixTest.php b/tests/Unit/Integrations/Divi/Release/CompatibilityMatrixTest.php
new file mode 100644
index 0000000..75703a2
--- /dev/null
+++ b/tests/Unit/Integrations/Divi/Release/CompatibilityMatrixTest.php
@@ -0,0 +1,137 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Divi\Release;
+
+use LIT\MCP\Integrations\Divi\Release\CompatibilityMatrix;
+use LIT\MCP\Integrations\Divi\Release\DiviFeature;
+use LIT\MCP\Integrations\Divi\Release\FeatureStatus;
+use LIT\MCP\Integrations\Divi\Release\ReleaseState;
+use PHPUnit\Framework\TestCase;
+
+final class CompatibilityMatrixTest extends TestCase
+{
+    public function testAFeatureWithoutResultIsIncompatible(): void
+    {
+        $matrix = new CompatibilityMatrix([
+            'page-read' => new FeatureStatus(DiviFeature::PageRead, ReleaseState::Released, [], 'code'),
+            // Under the wrong key: does not count for page-write.
+            'page-write' => new FeatureStatus(DiviFeature::PageRead, ReleaseState::Released, [], 'code'),
+        ]);
+
+        self::assertTrue($matrix->of(DiviFeature::PageRead)->usable());
+        foreach ([DiviFeature::PageWrite, DiviFeature::ThemeBuilderWrite] as $feature) {
+            $status = $matrix->of($feature);
+            self::assertSame(ReleaseState::Incompatible, $status->state);
+            self::assertSame([CompatibilityMatrix::MISSING], $status->problems);
+        }
+        self::assertCount(count(DiviFeature::cases()) - 1, $matrix->unusable());
+    }
+
+    public function testAllReleasedAndAllIncompatible(): void
+    {
+        $released = CompatibilityMatrix::allReleased('database');
+        $broken = CompatibilityMatrix::allIncompatible('kaputt');
+
+        foreach (DiviFeature::cases() as $feature) {
+            self::assertTrue($released->of($feature)->usable());
+            self::assertSame('database', $released->of($feature)->source);
+            self::assertSame(ReleaseState::Incompatible, $broken->of($feature)->state);
+            self::assertSame(['kaputt'], $broken->of($feature)->problems);
+            self::assertNull($broken->of($feature)->source);
+        }
+        self::assertSame([], $released->unusable());
+        self::assertSame('code', CompatibilityMatrix::allReleased()->source());
+    }
+
+    public function testTheStateIsTheWorstFeatureAndEveryProblemIsListedOnce(): void
+    {
+        $matrix = self::matrix([
+            'page-write' => [ReleaseState::Untested, ['a']],
+            'tb-write' => [ReleaseState::Incompatible, ['b', 'a']],
+        ]);
+
+        self::assertSame(ReleaseState::Incompatible, $matrix->state());
+        self::assertSame(['a', 'b'], $matrix->problems());
+        self::assertNull($matrix->source());
+        self::assertSame(ReleaseState::Untested, self::matrix(['catalog' => [ReleaseState::Untested, []]])->state());
+        self::assertSame(ReleaseState::Released, self::matrix([])->state());
+    }
+
+    public function testTheSourceOfAReleasedMatrixIsCommonOrNull(): void
+    {
+        self::assertSame('auto', self::matrix([])->source());
+
+        $mixed = new CompatibilityMatrix(array_merge(
+            self::features([]),
+            ['roles' => new FeatureStatus(DiviFeature::Roles, ReleaseState::Released, [], 'code')]
+        ));
+        self::assertSame(ReleaseState::Released, $mixed->state());
+        self::assertNull($mixed->source());
+    }
+
+    public function testUsableAndUnusable(): void
+    {
+        $matrix = self::matrix(['catalog' => [ReleaseState::Untested, []]]);
+
+        self::assertTrue($matrix->usable([DiviFeature::PageWrite, DiviFeature::PageRead]));
+        self::assertFalse($matrix->usable([DiviFeature::PageWrite, DiviFeature::Catalog]));
+        self::assertTrue($matrix->usable([]));
+        self::assertSame(
+            [DiviFeature::Catalog],
+            array_map(static fn (FeatureStatus $status): DiviFeature => $status->feature, $matrix->unusable())
+        );
+    }
+
+    public function testTheWriteFeaturesAreTheWritingCases(): void
+    {
+        self::assertSame(
+            array_values(array_filter(DiviFeature::cases(), static fn (DiviFeature $f): bool => $f->isWrite())),
+            CompatibilityMatrix::writeFeatures()
+        );
+        self::assertContains(DiviFeature::PageWrite, CompatibilityMatrix::writeFeatures());
+        self::assertNotContains(DiviFeature::PageRead, CompatibilityMatrix::writeFeatures());
+    }
+
+    public function testToArrayListsEveryFeatureInCaseOrder(): void
+    {
+        $rows = self::matrix(['tb-write' => [ReleaseState::Incompatible, ['b']]])->toArray();
+
+        self::assertSame(
+            array_map(static fn (DiviFeature $feature): string => $feature->value, DiviFeature::cases()),
+            array_column($rows, 'id')
+        );
+        self::assertContains(
+            ['id' => 'tb-write', 'label' => DiviFeature::ThemeBuilderWrite->label(), 'state' => 'incompatible',
+                'problems' => ['b'], 'source' => null],
+            $rows
+        );
+    }
+
+    /**
+     * @param array<string, array{ReleaseState, list<string>}> $locked
+     * @return array<string, FeatureStatus>
+     */
+    private static function features(array $locked): array
+    {
+        $features = [];
+        foreach (DiviFeature::cases() as $feature) {
+            [$state, $problems] = $locked[$feature->value] ?? [ReleaseState::Released, []];
+            $features[$feature->value] = new FeatureStatus(
+                $feature,
+                $state,
+                $problems,
+                $state === ReleaseState::Released ? 'auto' : null
+            );
+        }
+
+        return $features;
+    }
+
+    /** @param array<string, array{ReleaseState, list<string>}> $locked */
+    private static function matrix(array $locked): CompatibilityMatrix
+    {
+        return new CompatibilityMatrix(self::features($locked));
+    }
+}
diff --git a/tests/Unit/Integrations/Divi/Release/FeatureStatusTest.php b/tests/Unit/Integrations/Divi/Release/FeatureStatusTest.php
new file mode 100644
index 0000000..a2a356b
--- /dev/null
+++ b/tests/Unit/Integrations/Divi/Release/FeatureStatusTest.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Divi\Release;
+
+use LIT\MCP\Integrations\Divi\Release\DiviFeature;
+use LIT\MCP\Integrations\Divi\Release\FeatureStatus;
+use LIT\MCP\Integrations\Divi\Release\ReleaseState;
+use PHPUnit\Framework\TestCase;
+
+final class FeatureStatusTest extends TestCase
+{
+    public function testOnlyAReleasedFeatureIsUsable(): void
+    {
+        self::assertTrue((new FeatureStatus(DiviFeature::PageRead, ReleaseState::Released, [], 'auto'))->usable());
+        self::assertFalse((new FeatureStatus(DiviFeature::PageRead, ReleaseState::Untested))->usable());
+        self::assertFalse((new FeatureStatus(DiviFeature::PageRead, ReleaseState::Incompatible, ['x']))->usable());
+    }
+
+    public function testSummaryForRefusalsAndToArrayWithTheSource(): void
+    {
+        $status = new FeatureStatus(DiviFeature::PresetWrite, ReleaseState::Incompatible, ['Designsystem: x()']);
+
+        self::assertSame(
+            ['id' => 'preset-write', 'label' => DiviFeature::PresetWrite->label(), 'state' => 'incompatible',
+                'problems' => ['Designsystem: x()']],
+            $status->summary()
+        );
+        self::assertSame($status->summary() + ['source' => null], $status->toArray());
+    }
+}
diff --git a/tests/Unit/Integrations/Divi/Release/ManifestCheckTest.php b/tests/Unit/Integrations/Divi/Release/ManifestCheckTest.php
index dbcea6c..046aa85 100644
--- a/tests/Unit/Integrations/Divi/Release/ManifestCheckTest.php
+++ b/tests/Unit/Integrations/Divi/Release/ManifestCheckTest.php
@@ -7,9 +7,13 @@ namespace LIT\MCP\Tests\Unit\Integrations\Divi\Release;
 use ArrayObject;
 use Brain\Monkey\Functions;
 use LIT\MCP\Integrations\Divi\Release\Call;
+use LIT\MCP\Integrations\Divi\Release\ConstantRequirement;
+use LIT\MCP\Integrations\Divi\Release\DiviFeature;
 use LIT\MCP\Integrations\Divi\Release\Manifest;
 use LIT\MCP\Integrations\Divi\Release\ManifestCheck;
 use LIT\MCP\Integrations\Divi\Release\Mirror;
+use LIT\MCP\Integrations\Divi\Release\Problem;
+use LIT\MCP\Integrations\Divi\Release\SignatureFingerprint;
 use LIT\MCP\Tests\Unit\TestCase;
 use RuntimeException;
 
@@ -131,4 +135,101 @@ final class ManifestCheckTest extends TestCase
             ManifestCheck::failed($checks)
         );
     }
+
+    /** A manifest with one requirement per problem kind; the default feature is page-read. */
+    private function featureCheck(?\Closure $current = null): ManifestCheck
+    {
+        $manifest = new Manifest(
+            Manifest::PAGES,
+            calls: [
+                new Call('strlen', 1),
+                new Call('str_replace', 3, [DiviFeature::PageWrite]),
+                new Call('trim', 1),
+                new Call('lit_mcp_missing_function', 0, [DiviFeature::PageWrite, DiviFeature::ThemeBuilderWrite]),
+            ],
+            constants: [
+                new ConstantRequirement('PHP_VERSION'),
+                new ConstantRequirement('LIT_MCP_MISSING_CONSTANT', [DiviFeature::Catalog]),
+            ],
+            postTypes: ['lit_mcp_missing_type'],
+            mirrors: [
+                new Mirror('same', 'a.php', 'a', null, 'gleich'),
+                new Mirror('changed', 'b.php', 'b', null, 'geändert', [DiviFeature::ThemeBuilderWrite]),
+                new Mirror('no-expectation', 'd.php', 'd', null, 'ohne Soll'),
+            ],
+            features: [DiviFeature::PageRead]
+        );
+        $hashes = ['same' => 'h1', 'changed' => 'hX', 'no-expectation' => 'h4'];
+
+        return new ManifestCheck(
+            ['A' => $manifest],
+            [
+                'same' => 'h1',
+                'changed' => 'h2',
+                'sig:strlen' => (string) SignatureFingerprint::of(new Call('strlen', 1)),
+                'sig:str_replace' => 'a different signature',
+            ],
+            $current ?? static fn (Mirror $mirror): ?string => $hashes[$mirror->id] ?? null,
+            static fn (string $name): bool => false
+        );
+    }
+
+    /**
+     * @param list<Problem> $problems
+     * @return list<array{label: string, kind: string, features: list<string>}>
+     */
+    private static function rows(array $problems): array
+    {
+        return array_map(static fn (Problem $problem): array => $problem->toArray(), $problems);
+    }
+
+    public function testCodeProblemsNameKindAndFeaturesOfEveryFailedCall(): void
+    {
+        self::assertSame(
+            [
+                ['label' => 'Seiten: str_replace() – Signatur geändert', 'kind' => 'signature',
+                    'features' => ['page-write']],
+                ['label' => 'Seiten: trim() – Referenz der Signatur fehlt', 'kind' => 'reference-missing',
+                    'features' => ['page-read']],
+                ['label' => 'Seiten: lit_mcp_missing_function()', 'kind' => 'call',
+                    'features' => ['page-write', 'tb-write']],
+                ['label' => 'Seiten: Konstante LIT_MCP_MISSING_CONSTANT', 'kind' => 'constant',
+                    'features' => ['catalog']],
+            ],
+            self::rows($this->featureCheck(static function (): never {
+                self::fail('code problems never read Divi files');
+            })->codeProblems())
+        );
+    }
+
+    public function testAMirrorWithoutReferenceIsAMirrorProblemLikeAChangedOne(): void
+    {
+        self::assertSame(
+            [
+                ['label' => 'Seiten: Nachbau von b() – geändert', 'kind' => 'mirror', 'features' => ['tb-write']],
+                ['label' => 'Seiten: Nachbau von d() – ohne Soll', 'kind' => 'mirror', 'features' => ['page-read']],
+            ],
+            self::rows($this->featureCheck()->mirrorProblems())
+        );
+    }
+
+    public function testAnUnreadableMirrorIsAMirrorProblem(): void
+    {
+        $problems = $this->featureCheck(static function (): never {
+            throw new RuntimeException('Divi file gone');
+        })->mirrorProblems();
+
+        self::assertSame(['mirror', 'mirror', 'mirror'], array_column(self::rows($problems), 'kind'));
+    }
+
+    public function testProblemsAreCodeThenMirrorsAndRegistrationIsNone(): void
+    {
+        $check = $this->featureCheck();
+
+        self::assertEquals(array_merge($check->codeProblems(), $check->mirrorProblems()), $check->problems());
+        self::assertNotContains(
+            'Seiten: Post-Typ lit_mcp_missing_type',
+            array_column(self::rows($check->problems()), 'label')
+        );
+    }
 }
diff --git a/tests/Unit/Integrations/Divi/Release/ProblemTest.php b/tests/Unit/Integrations/Divi/Release/ProblemTest.php
new file mode 100644
index 0000000..78020ce
--- /dev/null
+++ b/tests/Unit/Integrations/Divi/Release/ProblemTest.php
@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Divi\Release;
+
+use LIT\MCP\Integrations\Divi\Release\DiviFeature;
+use LIT\MCP\Integrations\Divi\Release\Problem;
+use PHPUnit\Framework\TestCase;
+
+final class ProblemTest extends TestCase
+{
+    public function testOnlyCallMirrorConstantAndResolverAreHard(): void
+    {
+        $hard = [];
+        foreach (['call', 'signature', 'mirror', 'constant', 'reference-missing', 'resolver'] as $kind) {
+            $hard[$kind] = (new Problem('x', [DiviFeature::PageWrite], $kind))->isHard();
+        }
+
+        self::assertSame(
+            ['call' => true, 'signature' => false, 'mirror' => true, 'constant' => true,
+                'reference-missing' => false, 'resolver' => true],
+            $hard
+        );
+    }
+
+    public function testConcernsItsFeaturesAndWithoutFeaturesEveryFeature(): void
+    {
+        $problem = new Problem('x', [DiviFeature::PageWrite, DiviFeature::ThemeBuilderWrite], Problem::CALL);
+        self::assertTrue($problem->concerns(DiviFeature::ThemeBuilderWrite));
+        self::assertFalse($problem->concerns(DiviFeature::PageRead));
+
+        $unassigned = new Problem('x', [], Problem::CALL);
+        foreach (DiviFeature::cases() as $feature) {
+            self::assertTrue($unassigned->concerns($feature), $feature->value);
+        }
+    }
+
+    public function testRoundTripsThroughTheCacheFormat(): void
+    {
+        $problem = new Problem('Seiten: Nachbau von a() – x', [DiviFeature::PageWrite], Problem::MIRROR);
+
+        self::assertSame(
+            ['label' => 'Seiten: Nachbau von a() – x', 'kind' => 'mirror', 'features' => ['page-write']],
+            $problem->toArray()
+        );
+        self::assertEquals($problem, Problem::fromArray($problem->toArray()));
+    }
+
+    public function testFromArrayRefusesAnythingElse(): void
+    {
+        foreach ([
+            'no array' => 'Seiten: x()',
+            'no label' => ['kind' => 'call', 'features' => []],
+            'unknown kind' => ['label' => 'x', 'kind' => 'other', 'features' => []],
+            'unknown feature' => ['label' => 'x', 'kind' => 'call', 'features' => ['page-delete']],
+            'features no list' => ['label' => 'x', 'kind' => 'call', 'features' => 'page-write'],
+        ] as $case => $row) {
+            self::assertNull(Problem::fromArray($row), $case);
+        }
+    }
+}
diff --git a/tests/Unit/Integrations/Divi/Release/ReleaseGateTest.php b/tests/Unit/Integrations/Divi/Release/ReleaseGateTest.php
index 7cc7a42..8225b3d 100644
--- a/tests/Unit/Integrations/Divi/Release/ReleaseGateTest.php
+++ b/tests/Unit/Integrations/Divi/Release/ReleaseGateTest.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace LIT\MCP\Tests\Unit\Integrations\Divi\Release;
 
 use LIT\MCP\Abilities\WriteFailed;
+use LIT\MCP\Integrations\Divi\Release\DiviFeature;
 use LIT\MCP\Integrations\Divi\Release\DiviLocked;
 use LIT\MCP\Integrations\Divi\Release\ReleaseGate;
 use LIT\MCP\Integrations\Divi\Release\ReleaseState;
@@ -109,6 +110,11 @@ final class ReleaseGateTest extends TestCase
         }
 
         self::assertSame(ReleaseState::Incompatible, $status->state);
+        self::assertCount(count(DiviFeature::cases()), $status->matrix->unusable(), 'every feature is locked');
+        self::assertSame(
+            ['Der Freigabe-Zustand ließ sich nicht ermitteln (Details im PHP-Error-Log).'],
+            $status->matrix->of(DiviFeature::PageRead)->problems
+        );
         self::assertStringContainsString('theme API gone', (string) file_get_contents($log));
         unlink($log);
         $this->expectException(DiviLocked::class);
diff --git a/tests/Unit/Integrations/Divi/Release/ReleaseResolverTest.php b/tests/Unit/Integrations/Divi/Release/ReleaseResolverTest.php
index 9df4bcc..59ee1f3 100644
--- a/tests/Unit/Integrations/Divi/Release/ReleaseResolverTest.php
+++ b/tests/Unit/Integrations/Divi/Release/ReleaseResolverTest.php
@@ -4,10 +4,14 @@ declare(strict_types=1);
 
 namespace LIT\MCP\Tests\Unit\Integrations\Divi\Release;
 
+use Brain\Monkey\Filters;
 use Brain\Monkey\Functions;
+use LIT\MCP\Integrations\Divi\Release\DiviFeature;
 use LIT\MCP\Integrations\Divi\Release\ManifestCheck;
+use LIT\MCP\Integrations\Divi\Release\Problem;
 use LIT\MCP\Integrations\Divi\Release\ReleaseResolver;
 use LIT\MCP\Integrations\Divi\Release\ReleaseState;
+use LIT\MCP\Integrations\Divi\Release\ReleaseStatus;
 use LIT\MCP\Integrations\Divi\Release\ReleaseStore;
 use LIT\MCP\Plugin;
 use LIT\MCP\Tests\Unit\TestCase;
@@ -15,13 +19,21 @@ use Mockery;
 
 final class ReleaseResolverTest extends TestCase
 {
+    private const UNKNOWN = '5.99.0';
+
     /** @var array<string, mixed> */
     private array $transients = [];
 
+    private int $mirrorRuns = 0;
+
+    private int $codeRuns = 0;
+
     protected function setUp(): void
     {
         parent::setUp();
         $this->transients = [];
+        $this->mirrorRuns = 0;
+        $this->codeRuns = 0;
         Functions\when('get_transient')->alias(fn (string $key): mixed => $this->transients[$key] ?? false);
         Functions\when('set_transient')->alias(function (string $key, mixed $value): bool {
             $this->transients[$key] = $value;
@@ -31,8 +43,9 @@ final class ReleaseResolverTest extends TestCase
     }
 
     /**
-     * @param array<string, callable(): bool> $code
-     * @param array<string, callable(): bool> $mirrors
+     * @param list<Problem>             $code
+     * @param list<Problem>             $mirrors
+     * @param array<string, mixed>|null $entry
      */
     private function resolver(
         string $version,
@@ -41,8 +54,16 @@ final class ReleaseResolverTest extends TestCase
         ?array $entry = null
     ): ReleaseResolver {
         $check = Mockery::mock(ManifestCheck::class);
-        $check->allows('codeChecks')->andReturn($code);
-        $check->allows('mirrorChecks')->andReturn($mirrors);
+        $check->allows('codeProblems')->andReturnUsing(function () use ($code): array {
+            ++$this->codeRuns;
+
+            return $code;
+        });
+        $check->allows('mirrorProblems')->andReturnUsing(function () use ($mirrors): array {
+            ++$this->mirrorRuns;
+
+            return $mirrors;
+        });
         $store = Mockery::mock(ReleaseStore::class);
         $store->allows('find')->with($version, Plugin::VERSION)->andReturn($entry);
 
@@ -54,54 +75,246 @@ final class ReleaseResolverTest extends TestCase
         );
     }
 
-    public function testATestedVersionWithGreenChecksIsReleasedFromCode(): void
+    /** @param list<DiviFeature> $features */
+    private static function problem(string $kind, array $features, string $label = 'Seiten: et_x()'): Problem
+    {
+        return new Problem($label, $features, $kind);
+    }
+
+    /** @return array<string, string> Feature value => state, for every feature. */
+    private static function states(ReleaseStatus $status): array
+    {
+        $states = [];
+        foreach (DiviFeature::cases() as $feature) {
+            $states[$feature->value] = $status->matrix->of($feature)->state->value;
+        }
+
+        return $states;
+    }
+
+    /**
+     * @param array<string, string> $except Feature value => state.
+     * @return array<string, string>
+     */
+    private static function allBut(string $state, array $except = []): array
+    {
+        $states = [];
+        foreach (DiviFeature::cases() as $feature) {
+            $states[$feature->value] = $except[$feature->value] ?? $state;
+        }
+
+        return $states;
+    }
+
+    public function testATestedVersionWithoutProblemsIsReleasedFromCode(): void
     {
         $status = $this->resolver('5.2.1')->resolve();
 
         self::assertSame(ReleaseState::Released, $status->state);
         self::assertSame('code', $status->source);
+        self::assertSame(self::allBut('released'), self::states($status));
+        self::assertSame('code', $status->matrix->of(DiviFeature::PageWrite)->source);
     }
 
-    public function testAnUnknownVersionIsUntestedUnlessTheDatabaseReleasedIt(): void
+    public function testAReleaseCoversChangedSignaturesAndMissingReferences(): void
     {
-        self::assertSame(ReleaseState::Untested, $this->resolver('5.3.0')->resolve()->state);
+        $status = $this->resolver('5.2.1', [
+            self::problem(Problem::SIGNATURE, [DiviFeature::PageWrite]),
+            self::problem(Problem::REFERENCE_MISSING, [DiviFeature::Catalog]),
+        ])->resolve();
 
-        $released = $this->resolver('5.3.0', entry: ['user_id' => 1, 'released_at' => 'd'])->resolve();
-        self::assertSame(ReleaseState::Released, $released->state);
-        self::assertSame('database', $released->source);
+        self::assertSame(self::allBut('released'), self::states($status));
+        self::assertTrue($status->writable());
+        self::assertSame([], $status->problems);
     }
 
-    public function testAFailedCheckMakesEvenATestedVersionIncompatible(): void
+    public function testAHardProblemLocksItsFeaturesEvenForATestedVersion(): void
     {
-        $status = $this->resolver('5.2.1', ['Seiten: et_x()' => static fn (): bool => false])->resolve();
+        $status = $this->resolver('5.2.1', [
+            self::problem(Problem::CALL, [DiviFeature::PageWrite], 'Seiten: et_x()'),
+            self::problem(Problem::CONSTANT, [DiviFeature::Catalog], 'Katalog: Konstante X'),
+        ])->resolve();
 
+        self::assertSame(
+            self::allBut('released', ['page-write' => 'incompatible', 'catalog' => 'incompatible']),
+            self::states($status)
+        );
+        self::assertSame(['Seiten: et_x()'], $status->matrix->of(DiviFeature::PageWrite)->problems);
         self::assertSame(ReleaseState::Incompatible, $status->state);
-        self::assertSame(['Seiten: et_x()'], $status->problems);
+        self::assertSame(['Seiten: et_x()', 'Katalog: Konstante X'], $status->problems);
+        self::assertFalse($status->writable());
     }
 
-    public function testMirrorResultsAreCachedByStateKey(): void
+    public function testAProblemWithoutFeaturesLocksEveryFeature(): void
     {
-        $calls = 0;
-        $mirrors = ['Theme Builder: Nachbau von y()' => static function () use (&$calls): bool {
-            ++$calls;
+        $status = $this->resolver('5.2.1', [self::problem(Problem::CALL, [])])->resolve();
 
-            return false;
-        }];
+        self::assertSame(self::allBut('incompatible'), self::states($status));
+    }
+
+    /** Review focus 2: a changed mirror locks exactly its features – released version or automatic release. */
+    public function testAChangedMirrorLocksExactlyItsFeatures(): void
+    {
+        $mirror = self::problem(
+            Problem::MIRROR,
+            [DiviFeature::ThemeBuilderWrite, DiviFeature::LibraryWrite],
+            'Theme Builder: Nachbau von y() – z'
+        );
+        $expected = ['tb-write' => 'incompatible', 'library-write' => 'incompatible'];
+
+        self::assertSame(
+            self::allBut('released', $expected),
+            self::states($this->resolver('5.2.1', mirrors: [$mirror])->resolve())
+        );
+        $automatic = $this->resolver(self::UNKNOWN, mirrors: [$mirror])->resolve();
+        self::assertSame(self::allBut('released', $expected), self::states($automatic));
+        self::assertSame(
+            ['Theme Builder: Nachbau von y() – z'],
+            $automatic->matrix->of(DiviFeature::ThemeBuilderWrite)->problems
+        );
+    }
+
+    public function testAnUnknownVersionWithoutProblemsIsReleasedAutomatically(): void
+    {
+        $status = $this->resolver(self::UNKNOWN)->resolve();
+
+        self::assertSame(self::allBut('released'), self::states($status));
+        self::assertSame('auto', $status->source);
+        self::assertSame('auto', $status->matrix->of(DiviFeature::PresetWrite)->source);
+        self::assertTrue($status->writable());
+    }
+
+    /** Review focus 3: the automatic release needs every signature unchanged. */
+    public function testAChangedSignatureMakesItsFeatureIncompatibleUnderAutomaticRelease(): void
+    {
+        $status = $this->resolver(self::UNKNOWN, [
+            self::problem(Problem::SIGNATURE, [DiviFeature::PresetWrite], 'Designsystem: x() – Signatur geändert'),
+        ])->resolve();
+
+        self::assertSame(self::allBut('released', ['preset-write' => 'incompatible']), self::states($status));
+        self::assertSame(
+            ['Designsystem: x() – Signatur geändert'],
+            $status->matrix->of(DiviFeature::PresetWrite)->problems
+        );
+        self::assertFalse($status->writable());
+    }
+
+    public function testAMissingReferenceMakesItsFeatureUntestedUnderAutomaticRelease(): void
+    {
+        $status = $this->resolver(self::UNKNOWN, [
+            self::problem(Problem::REFERENCE_MISSING, [DiviFeature::Roles], 'Seiten: r() – Referenz fehlt'),
+            self::problem(Problem::REFERENCE_MISSING, [DiviFeature::PageRead]),
+            self::problem(Problem::SIGNATURE, [DiviFeature::PageRead]),
+        ])->resolve();
+
+        self::assertSame(
+            self::allBut('released', ['roles' => 'untested', 'page-read' => 'incompatible']),
+            self::states($status)
+        );
+        self::assertSame(
+            ['Seiten: r() – Referenz fehlt'],
+            $status->matrix->of(DiviFeature::Roles)->problems
+        );
+    }
+
+    /** Review focus 1: unknown version with the automatic release switched off. */
+    public function testWithoutAutomaticReleaseAnUnknownVersionIsUntestedUnlessSomethingHardFailed(): void
+    {
+        Filters\expectApplied(ReleaseResolver::AUTO_RELEASE_FILTER)->once()->with(true)->andReturn(false);
+
+        $status = $this->resolver(self::UNKNOWN, [
+            self::problem(Problem::SIGNATURE, [DiviFeature::PresetWrite]),
+            self::problem(Problem::CALL, [DiviFeature::Catalog]),
+        ])->resolve();
+
+        self::assertSame(self::allBut('untested', ['catalog' => 'incompatible']), self::states($status));
+        self::assertNull($status->matrix->of(DiviFeature::PageRead)->source);
+    }
+
+    public function testOnlyALiteralTrueSwitchesTheAutomaticReleaseOn(): void
+    {
+        Filters\expectApplied(ReleaseResolver::AUTO_RELEASE_FILTER)->once()->andReturn(1);
+
+        self::assertSame(self::allBut('untested'), self::states($this->resolver(self::UNKNOWN)->resolve()));
+    }
+
+    public function testADatabaseReleaseReleasesEveryFeatureWithoutHardProblems(): void
+    {
+        $entry = ['user_id' => 1, 'released_at' => 'd'];
+        $status = $this->resolver(self::UNKNOWN, [
+            self::problem(Problem::SIGNATURE, [DiviFeature::PageWrite]),
+            self::problem(Problem::REFERENCE_MISSING, [DiviFeature::Catalog]),
+        ], [self::problem(Problem::MIRROR, [DiviFeature::LibraryWrite])], $entry)->resolve();
+
+        self::assertSame(self::allBut('released', ['library-write' => 'incompatible']), self::states($status));
+        self::assertSame('database', $status->matrix->of(DiviFeature::PageWrite)->source);
+        self::assertSame($entry, $status->release);
+    }
+
+    public function testWithoutDiviNothingIsReleasedAutomatically(): void
+    {
+        $status = $this->resolver('')->resolve();
+
+        self::assertSame(ReleaseState::Untested, $status->state);
+        self::assertSame(self::allBut('untested'), self::states($status));
+    }
+
+    public function testCodeProblemsRunOnEveryResolveMirrorProblemsOncePerStateKey(): void
+    {
+        $mirrors = [self::problem(Problem::MIRROR, [DiviFeature::ThemeBuilderWrite], 'Theme Builder: Nachbau von y()')];
 
         $first = $this->resolver('5.2.1', mirrors: $mirrors)->resolve();
         $second = $this->resolver('5.2.1', mirrors: $mirrors)->resolve();
 
-        self::assertSame(1, $calls, 'the second resolve reads the transient');
-        self::assertSame(ReleaseState::Incompatible, $second->state);
+        self::assertSame(2, $this->codeRuns, 'code and signature checks are live');
+        self::assertSame(1, $this->mirrorRuns, 'the second resolve reads the transient');
+        self::assertSame(self::states($first), self::states($second));
         self::assertSame($first->problems, $second->problems);
-        self::assertSame('key-5.2.1', $this->transients[ReleaseResolver::CACHE]['key']);
+        self::assertSame(
+            ['format' => 2, 'key' => 'key-5.2.1', 'problems' => [
+                ['label' => 'Theme Builder: Nachbau von y()', 'kind' => 'mirror', 'features' => ['tb-write']],
+            ]],
+            $this->transients[ReleaseResolver::CACHE]
+        );
 
         $this->resolver('5.2.2', mirrors: $mirrors)->resolve();
-        self::assertSame(2, $calls, 'another state key checks again');
+        self::assertSame(2, $this->mirrorRuns, 'another state key checks again');
     }
 
-    public function testWithoutDiviTheVersionIsEmptyAndUntested(): void
+    /** Review focus 1: an old or broken transient is never trusted. */
+    public function testAnOldOrBrokenCacheEntryIsAMiss(): void
     {
-        self::assertSame(ReleaseState::Untested, $this->resolver('')->resolve()->state);
+        $mirrors = [self::problem(Problem::MIRROR, [DiviFeature::PageWrite])];
+        $entries = [
+            'format 1' => ['key' => 'key-5.2.1', 'problems' => []],
+            'other format' => ['format' => 3, 'key' => 'key-5.2.1', 'problems' => []],
+            'unknown feature' => ['format' => 2, 'key' => 'key-5.2.1', 'problems' => [
+                ['label' => 'x', 'kind' => 'mirror', 'features' => ['page-delete']],
+            ]],
+            'no list' => ['format' => 2, 'key' => 'key-5.2.1', 'problems' => 'none'],
+            'garbage' => 'x',
+        ];
+
+        foreach ($entries as $case => $entry) {
+            $this->transients[ReleaseResolver::CACHE] = $entry;
+            $runs = $this->mirrorRuns;
+
+            $status = $this->resolver('5.2.1', mirrors: $mirrors)->resolve();
+
+            self::assertSame($runs + 1, $this->mirrorRuns, $case);
+            self::assertFalse($status->matrix->of(DiviFeature::PageWrite)->usable(), $case);
+        }
+    }
+
+    public function testTheCacheHoldsProblemsSoAReleaseCountsAtOnce(): void
+    {
+        Filters\expectApplied(ReleaseResolver::AUTO_RELEASE_FILTER)->andReturn(false);
+
+        $before = $this->resolver(self::UNKNOWN)->resolve();
+        $after = $this->resolver(self::UNKNOWN, entry: ['user_id' => 1, 'released_at' => 'd'])->resolve();
+
+        self::assertSame(ReleaseState::Untested, $before->state);
+        self::assertSame(ReleaseState::Released, $after->state);
+        self::assertSame(1, $this->mirrorRuns);
     }
 }
diff --git a/tests/Unit/Integrations/Divi/Release/ReleaseStatusTest.php b/tests/Unit/Integrations/Divi/Release/ReleaseStatusTest.php
index 0a5c83e..6ac7efb 100644
--- a/tests/Unit/Integrations/Divi/Release/ReleaseStatusTest.php
+++ b/tests/Unit/Integrations/Divi/Release/ReleaseStatusTest.php
@@ -4,8 +4,11 @@ declare(strict_types=1);
 
 namespace LIT\MCP\Tests\Unit\Integrations\Divi\Release;
 
+use LIT\MCP\Integrations\Divi\Release\CompatibilityMatrix;
+use LIT\MCP\Integrations\Divi\Release\DiviFeature;
 use LIT\MCP\Integrations\Divi\Release\ReleaseState;
 use LIT\MCP\Integrations\Divi\Release\ReleaseStatus;
+use LIT\MCP\Tests\Support\ReleaseMatrices;
 use LIT\MCP\Tests\Unit\TestCase;
 use LogicException;
 
@@ -83,4 +86,50 @@ final class ReleaseStatusTest extends TestCase
             $status->toArray()
         );
     }
+
+    public function testWithoutMatrixEveryFeatureIsInTheGivenState(): void
+    {
+        $untested = new ReleaseStatus(ReleaseState::Untested, '5.3.0');
+        $broken = new ReleaseStatus(ReleaseState::Incompatible, '5.3.0', null, ['x']);
+        $released = ReleaseStatus::released('5.2.1', ReleaseStatus::SOURCE_DATABASE);
+
+        foreach (DiviFeature::cases() as $feature) {
+            self::assertSame(ReleaseState::Untested, $untested->matrix->of($feature)->state);
+            self::assertSame(['x'], $broken->matrix->of($feature)->problems);
+            self::assertSame('database', $released->matrix->of($feature)->source);
+        }
+    }
+
+    public function testOfTakesStateSourceAndProblemsFromTheMatrix(): void
+    {
+        $status = ReleaseStatus::of(
+            '5.99.0',
+            ReleaseMatrices::matrix([DiviFeature::Catalog], ReleaseState::Incompatible),
+            ['user_id' => 1]
+        );
+
+        self::assertSame(ReleaseState::Incompatible, $status->state);
+        self::assertNull($status->source);
+        self::assertSame(['Seiten: et_x() – Signatur geändert'], $status->problems);
+        self::assertSame(['user_id' => 1], $status->release);
+        self::assertSame('auto', ReleaseStatus::of('5.99.0', CompatibilityMatrix::allReleased('auto'))->source);
+    }
+
+    public function testWritableAsksOnlyTheWritingFeatures(): void
+    {
+        $readLocked = ReleaseMatrices::status([DiviFeature::Catalog, DiviFeature::PageRead]);
+        self::assertSame(ReleaseState::Untested, $readLocked->state);
+        self::assertTrue($readLocked->writable());
+
+        foreach (CompatibilityMatrix::writeFeatures() as $feature) {
+            self::assertFalse(ReleaseMatrices::status([$feature])->writable(), $feature->value);
+        }
+    }
+
+    public function testAMatrixInAnotherStateThanTheStatusIsRefused(): void
+    {
+        $this->expectException(LogicException::class);
+
+        new ReleaseStatus(ReleaseState::Released, '5.2.1', 'code', [], null, CompatibilityMatrix::allIncompatible('x'));
+    }
 }