diff --git a/src/Coverage/CoverageMergeCommand.php b/src/Coverage/CoverageMergeCommand.php
index 4ebc3eb..b9dc527 100644
--- a/src/Coverage/CoverageMergeCommand.php
+++ b/src/Coverage/CoverageMergeCommand.php
@@ -505,7 +505,7 @@ private function appendGithubStepSummary(array $results, ?string $githubSummaryP
      * caller decides what to do with the return value (only `strict=true`
      * misses propagate to a non-zero exit).
      *
-     * @param array<string, array<string, mixed>> $results
+     * @param array<string, CoverageResult> $results
      */
     private function evaluateThresholdGate(
         array $results,
@@ -517,7 +517,6 @@ private function evaluateThresholdGate(
             return false;
         }
 
-        /** @var array<string, array{endpoints: list<mixed>, endpointTotal: int, endpointFullyCovered: int, endpointPartial: int, endpointUncovered: int, endpointRequestOnly: int, responseTotal: int, responseCovered: int, responseSkipped: int, responseUncovered: int}> $results */
         $evaluation = CoverageThresholdEvaluator::evaluate($results, $minEndpointPct, $minResponsePct, $strict);
 
         if ($evaluation['passed']) {
@@ -654,7 +653,7 @@ private function reportThresholdProblem(bool $strict, string $detail): array
     /**
      * @param list<string> $specs
      *
-     * @return array<string, array<string, mixed>>
+     * @return array<string, CoverageResult>
      */
     private function computeResults(array $specs, OpenApiCoverageTracker $tracker): array
     {
diff --git a/tests/Unit/Coverage/CoverageThresholdEvaluatorTest.php b/tests/Unit/Coverage/CoverageThresholdEvaluatorTest.php
index e2a03cb..9476f4d 100644
--- a/tests/Unit/Coverage/CoverageThresholdEvaluatorTest.php
+++ b/tests/Unit/Coverage/CoverageThresholdEvaluatorTest.php
@@ -7,12 +7,16 @@
 use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\TestCase;
 use Studio\OpenApiContractTesting\Coverage\CoverageThresholdEvaluator;
+use Studio\OpenApiContractTesting\Coverage\OpenApiCoverageTracker;
 
 use function explode;
 use function str_repeat;
 use function substr;
 use function trim;
 
+/**
+ * @phpstan-import-type CoverageResult from OpenApiCoverageTracker
+ */
 class CoverageThresholdEvaluatorTest extends TestCase
 {
     #[Test]
@@ -240,7 +244,7 @@ public function aligns_second_message_line_to_label_indent(): void
      * defaults match the empty/zero shape so a typo can't accidentally inflate
      * a metric.
      *
-     * @return array<string, mixed>
+     * @return CoverageResult
      */
     private static function counts(
         int $endpointFullyCovered,
diff --git a/tests/Unit/Coverage/HtmlCoverageRendererTest.php b/tests/Unit/Coverage/HtmlCoverageRendererTest.php
index 08b9ada..57e820e 100644
--- a/tests/Unit/Coverage/HtmlCoverageRendererTest.php
+++ b/tests/Unit/Coverage/HtmlCoverageRendererTest.php
@@ -8,6 +8,7 @@
 use PHPUnit\Framework\TestCase;
 use Studio\OpenApiContractTesting\Coverage\EndpointCoverageState;
 use Studio\OpenApiContractTesting\Coverage\HtmlCoverageRenderer;
+use Studio\OpenApiContractTesting\Coverage\OpenApiCoverageTracker;
 use Studio\OpenApiContractTesting\Coverage\ResponseCoverageState;
 
 use function array_unique;
@@ -16,6 +17,9 @@
 use function sort;
 use function substr_count;
 
+/**
+ * @phpstan-import-type EndpointSummary from OpenApiCoverageTracker
+ */
 class HtmlCoverageRendererTest extends TestCase
 {
     #[Test]
@@ -560,7 +564,7 @@ private static function row(
     }
 
     /**
-     * @param array<string, mixed> $endpoint
+     * @param EndpointSummary $endpoint
      */
     private function renderOne(
         string $specName,
diff --git a/tests/Unit/Coverage/JUnitCoverageRendererTest.php b/tests/Unit/Coverage/JUnitCoverageRendererTest.php
index 62a3677..efcbf84 100644
--- a/tests/Unit/Coverage/JUnitCoverageRendererTest.php
+++ b/tests/Unit/Coverage/JUnitCoverageRendererTest.php
@@ -9,11 +9,15 @@
 use SimpleXMLElement;
 use Studio\OpenApiContractTesting\Coverage\EndpointCoverageState;
 use Studio\OpenApiContractTesting\Coverage\JUnitCoverageRenderer;
+use Studio\OpenApiContractTesting\Coverage\OpenApiCoverageTracker;
 use Studio\OpenApiContractTesting\Coverage\ResponseCoverageState;
 
 use function explode;
 use function simplexml_load_string;
 
+/**
+ * @phpstan-import-type EndpointSummary from OpenApiCoverageTracker
+ */
 class JUnitCoverageRendererTest extends TestCase
 {
     #[Test]
@@ -388,7 +392,7 @@ private static function row(
     /**
      * Convenience: render a single-endpoint coverage result for a single spec.
      *
-     * @param array<string, mixed> $endpoint
+     * @param EndpointSummary $endpoint
      */
     private function renderOne(
         string $specName,
diff --git a/tests/Unit/Coverage/JsonCoverageRendererTest.php b/tests/Unit/Coverage/JsonCoverageRendererTest.php
index 9ccbed6..35ab2ef 100644
--- a/tests/Unit/Coverage/JsonCoverageRendererTest.php
+++ b/tests/Unit/Coverage/JsonCoverageRendererTest.php
@@ -10,6 +10,7 @@
 use PHPUnit\Framework\TestCase;
 use Studio\OpenApiContractTesting\Coverage\EndpointCoverageState;
 use Studio\OpenApiContractTesting\Coverage\JsonCoverageRenderer;
+use Studio\OpenApiContractTesting\Coverage\OpenApiCoverageTracker;
 use Studio\OpenApiContractTesting\Coverage\ResponseCoverageState;
 
 use function array_keys;
@@ -17,6 +18,9 @@
 use function is_array;
 use function json_decode;
 
+/**
+ * @phpstan-import-type CoverageResult from OpenApiCoverageTracker
+ */
 class JsonCoverageRendererTest extends TestCase
 {
     private const FIXED_TIMESTAMP = '2026-05-11T12:34:56+00:00';
@@ -442,7 +446,7 @@ private function renderOneValidated(): string
     }
 
     /**
-     * @return array<string, array<string, mixed>>
+     * @return array<string, CoverageResult>
      */
     private function oneSpecResults(): array
     {
diff --git a/tests/Unit/Coverage/MarkdownCoverageRendererLintTest.php b/tests/Unit/Coverage/MarkdownCoverageRendererLintTest.php
index e5851ae..40239ac 100644
--- a/tests/Unit/Coverage/MarkdownCoverageRendererLintTest.php
+++ b/tests/Unit/Coverage/MarkdownCoverageRendererLintTest.php
@@ -8,6 +8,7 @@
 use PHPUnit\Framework\TestCase;
 use Studio\OpenApiContractTesting\Coverage\EndpointCoverageState;
 use Studio\OpenApiContractTesting\Coverage\MarkdownCoverageRenderer;
+use Studio\OpenApiContractTesting\Coverage\OpenApiCoverageTracker;
 use Studio\OpenApiContractTesting\Coverage\ResponseCoverageState;
 
 use function dirname;
@@ -23,6 +24,10 @@
 use function tempnam;
 use function unlink;
 
+/**
+ * @phpstan-import-type CoverageResult from OpenApiCoverageTracker
+ * @phpstan-import-type EndpointSummary from OpenApiCoverageTracker
+ */
 final class MarkdownCoverageRendererLintTest extends TestCase
 {
     #[Test]
@@ -38,7 +43,7 @@ public function edge_cases_rendered_markdown_passes_markdownlint(): void
     }
 
     /**
-     * @return array<string, array<string, mixed>>
+     * @return array<string, CoverageResult>
      */
     private static function standardFixture(): array
     {
@@ -88,7 +93,7 @@ private static function standardFixture(): array
     }
 
     /**
-     * @return array<string, array<string, mixed>>
+     * @return array<string, CoverageResult>
      */
     private static function edgeCasesFixture(): array
     {
@@ -137,7 +142,7 @@ private static function edgeCasesFixture(): array
      * @param list<array{statusKey: string, contentTypeKey: string, state: ResponseCoverageState, hits: int, skipReason: ?string}> $responses
      * @param list<array{statusKey: string, contentTypeKey: string}> $unexpectedObservations
      *
-     * @return array<string, mixed>
+     * @return EndpointSummary
      */
     private static function endpoint(
         string $endpoint,
@@ -187,7 +192,7 @@ private static function row(
     }
 
     /**
-     * @param array<string, array<string, mixed>> $results
+     * @param array<string, CoverageResult> $results
      */
     private function assertRenderedMarkdownPassesLint(array $results): void
     {