# Extension surface catalogue Generated from executable metadata by `scripts/build-extension-surface-catalog.php`. JSON is the machine-readable source; this page is the human index. | Stable ID | Kind | Identifier | Owner | Stability | Summary | | --------------------------------------------------------- | -------------- | ------------------------------------------------------------------------------------- | ------------------------ | ------------ | ---------------------------------------------------------------------------------------------- | | `admin.contract.admin-tool-item` | contract | `Capell\Admin\Contracts\AdminTools\AdminToolItem` | `capell-app/admin` | experimental | Typed admin header tool contribution boundary. | | `admin.contract.admin-zone-contribution` | contract | `Capell\Admin\Contracts\AdminZoneContribution` | `capell-app/admin` | stable | Typed stable Admin zone contribution boundary. | | `admin.dto.admin-zone-context` | dto | `Capell\Admin\Data\AdminZoneContextData` | `capell-app/admin` | stable | Explicit Admin zone render context. | | `admin.dto.admin-zone-contribution` | dto | `Capell\Admin\Data\AdminZoneContributionData` | `capell-app/admin` | stable | Owner-aware typed Admin zone contribution. | | `admin.enum.admin-zone` | enum | `Capell\Admin\Enums\AdminZone` | `capell-app/admin` | stable | Stable Admin zone vocabulary. | | `admin.registrar.admin-zone` | registrar | `Capell\Admin\Support\Bridges\AdminBridgeRegistrar` | `capell-app/admin` | stable | Registers package contributions to stable Admin zones. | | `admin.registrar.workspace` | registrar | `Capell\Admin\Support\Bridges\AdminBridgeRegistrar` | `capell-app/admin` | stable | Registers permission-filtered role workspace tools from an Admin bridge. | | `admin.registry.admin-zone` | registry | `Capell\Admin\Support\AdminZoneRegistry` | `capell-app/admin` | stable | Deterministic, permission-aware Admin zone composition. | | `admin.registry.surface-contribution` | registry | `Capell\Admin\Support\AdminSurfaceContributionRegistry` | `capell-app/admin` | experimental | Owner-aware ordered Admin surface contributions. | | `admin.render-hook.navigation-after` | render-hook | `panels::sidebar.nav.end` | `capell-app/admin` | experimental | Admin navigation contribution hook. | | `admin.tag.admin-tool-item` | tagged-service | `capell-admin:admin-tool-items` | `capell-app/admin` | experimental | Container tag for admin header tool contributions. | | `core.action.build-publication-locale-status` | action | `Capell\Core\Actions\Publishing\BuildPublicationLocaleStatusAction` | `capell-app/core` | experimental | Typed locale-scoped publication status projection. | | `core.action.install-project-build-manifest` | action | `Capell\Core\Actions\ProjectBuild\InstallProjectBuildManifestAction` | `capell-app/core` | stable | Target-compatible ordered package installation followed by deterministic SiteSpec application. | | `core.action.project-build-signing-input` | action | `Capell\Core\Actions\ProjectBuild\CanonicalizeProjectBuildManifestSigningInputAction` | `capell-app/core` | stable | Canonical detached-signature input for portable project manifests. | | `core.action.publish-outbound-event` | action | `Capell\Core\Actions\PublishOutboundEventAction` | `capell-app/core` | experimental | Single typed outbound event publication path. | | `core.action.reporting-dispatch` | action | `Capell\Core\Actions\Reporting\DispatchSignalAction` | `capell-app/core` | experimental | Configured signal dispatch with cooldown and safe log fallback. | | `core.action.reporting-health` | action | `Capell\Core\Actions\Reporting\GetReportingHealthAction` | `capell-app/core` | experimental | Aggregate health status without incident payloads. | | `core.action.reporting-incident` | action | `Capell\Core\Actions\Reporting\GetReportingIncidentAction` | `capell-app/core` | experimental | Private redacted incident state and delivery receipts. | | `core.action.reporting-process` | action | `Capell\Core\Actions\Reporting\ProcessReportingIncidentsAction` | `capell-app/core` | experimental | Bounded retry and backup escalation processing. | | `core.action.reporting-prune` | action | `Capell\Core\Actions\Reporting\PruneReportingIncidentsAction` | `capell-app/core` | experimental | Bounded retention of resolved incidents. | | `core.action.reporting-transition` | action | `Capell\Core\Actions\Reporting\UpdateReportingIncidentAction` | `capell-app/core` | experimental | Assigned-operator acknowledgement and resolution. | | `core.action.validate-project-build-bundle` | action | `Capell\Core\Actions\ProjectBuild\ValidateProjectBuildManifestBundleAction` | `capell-app/core` | stable | Fail-closed signature and artifact validation for portable project manifests. | | `core.action.verify-project-build-signature` | action | `Capell\Core\Actions\ProjectBuild\VerifyProjectBuildManifestSignatureAction` | `capell-app/core` | stable | Ed25519 verification for portable project manifests. | | `core.action.verify-project-build-target` | action | `Capell\Core\Actions\ProjectBuild\VerifyProjectBuildTargetCompatibilityAction` | `capell-app/core` | stable | Fail-closed Capell, PHP, and platform compatibility verification for project build targets. | | `core.config.reporting` | config | `capell-reporting` | `capell-app/core` | experimental | Reporting defaults, category and exact signal policies, and opt-in transports. | | `core.config.roles-admin` | config | `capell.roles.admin` | `capell-app/core` | experimental | Configured administrator role name. | | `core.contract.blueprint-subject` | contract | `Capell\Core\Contracts\Extensions\RegistersExtensionBlueprintSubject` | `capell-app/core` | experimental | Package-owned blueprint subject contribution boundary. | | `core.contract.collects-daily-metrics` | contract | `Capell\Core\Contracts\Metrics\CollectsDailyMetrics` | `capell-app/core` | experimental | Typed daily metric collection boundary. | | `core.contract.database-platform` | contract | `Capell\Core\Contracts\Database\DatabasePlatform` | `capell-app/core` | experimental | Database family metadata and dialect boundary. | | `core.contract.database-provisioner` | contract | `Capell\Core\Contracts\Database\DatabaseProvisioner` | `capell-app/core` | experimental | Installer database provisioning boundary. | | `core.contract.database-query-dialect` | contract | `Capell\Core\Contracts\Database\DatabaseQueryDialect` | `capell-app/core` | experimental | Portable SQL expression boundary. | | `core.contract.database-schema-dialect` | contract | `Capell\Core\Contracts\Database\DatabaseSchemaDialect` | `capell-app/core` | experimental | Portable database schema capability boundary. | | `core.contract.extension-contribution` | contract | `Capell\Core\Contracts\Extensions\ExtensionContribution` | `capell-app/core` | stable | Core contribution boundary. | | `core.contract.extension-contribution-receipt` | contract | `Capell\Core\Contracts\Extensions\RecordsExtensionContributionReceipt` | `capell-app/core` | stable | Neutral runtime contribution receipt boundary. | | `core.contract.frontend-route-reservation-contributor` | contract | `Capell\Core\Contracts\FrontendRouteReservationContributor` | `capell-app/core` | experimental | Typed frontend route reservation contributions. | | `core.contract.health-check` | contract | `Capell\Core\Contracts\Extensions\ChecksExtensionHealth` | `capell-app/core` | experimental | Typed extension health checks. | | `core.contract.interaction-target-capability-contributor` | contract | `Capell\Core\Contracts\InteractionTargetCapabilityContributor` | `capell-app/core` | experimental | Typed interaction target capability contributions. | | `core.contract.metric-scope-authorizer` | contract | `Capell\Core\Contracts\Metrics\MetricScopeAuthorizer` | `capell-app/core` | experimental | Metric scope read authorization boundary. | | `core.contract.operational-health-check` | contract | `Capell\Core\Contracts\Health\HealthCheck` | `capell-app/core` | experimental | Bounded operational health check boundary. | | `core.contract.outbound-event` | contract | `Capell\Core\Contracts\Extensions\RegistersExtensionOutboundEvent` | `capell-app/core` | experimental | Package-owned outbound event contribution boundary. | | `core.contract.project-build-artifact-handler` | contract | `Capell\Core\Contracts\ProjectBuild\ProjectBuildArtifactHandler` | `capell-app/core` | stable | Package-owned project artifact verification boundary. | | `core.contract.project-build-package-installer` | contract | `Capell\Core\Contracts\ProjectBuild\ProjectBuildPackageInstaller` | `capell-app/core` | stable | Consumer-owned exact package acquisition and installed-release evidence boundary. | | `core.contract.public-render-data` | contract | `Capell\Core\Contracts\Extensions\RegistersExtensionPublicRenderData` | `capell-app/core` | experimental | Package-owned public render-data contribution marker. | | `core.contract.publication-readiness-contributor` | contract | `Capell\Core\Contracts\Publishing\PublicationReadinessContributor` | `capell-app/core` | experimental | Package-owned publication readiness checks for publishable records. | | `core.contract.reporter` | contract | `Capell\Core\Contracts\Reporting\Reporter` | `capell-app/core` | experimental | Vendor-neutral operational signal delivery boundary. | | `core.contract.site-spec-applier` | contract | `Capell\Core\Contracts\SiteSpec\SiteSpecApplier` | `capell-app/core` | stable | Package-owned SiteSpec application boundary. | | `core.dto.blueprint-subject-descriptor` | dto | `Capell\Core\Data\BlueprintSubjectDescriptorData` | `capell-app/core` | experimental | Typed blueprint subject metadata. | | `core.dto.database-index-definition` | dto | `Capell\Core\Data\Database\DatabaseIndexDefinition` | `capell-app/core` | experimental | Portable database index definition. | | `core.dto.extension-contribution` | dto | `Capell\Core\Data\Manifest\ExtensionContributionData` | `capell-app/core` | stable | Typed manifest contribution data. | | `core.dto.extension-contribution-receipt` | dto | `Capell\Core\Data\Extensions\ExtensionContributionReceiptData` | `capell-app/core` | stable | Typed runtime contribution receipt. | | `core.dto.extension-contribution-traceability` | dto | `Capell\Core\Data\Manifest\ExtensionContributionTraceabilityData` | `capell-app/core` | stable | Typed manifest runtime traceability envelope. | | `core.dto.extension-order-diagnostic` | dto | `Capell\Core\Data\Extensions\ExtensionOrderDiagnosticData` | `capell-app/core` | experimental | Structured ordering fallback diagnostic. | | `core.dto.frontend-route-reservation` | dto | `Capell\Core\Data\FrontendRouteReservationData` | `capell-app/core` | experimental | Typed frontend route reservation data. | | `core.dto.health-check-result` | dto | `Capell\Core\Data\Health\HealthCheckResultData` | `capell-app/core` | experimental | Safe typed operational health check result. | | `core.dto.health-report` | dto | `Capell\Core\Data\Health\HealthReportData` | `capell-app/core` | experimental | Deterministic operational health report. | | `core.dto.metric-collection-result` | dto | `Capell\Core\Data\Metrics\MetricCollectionResultData` | `capell-app/core` | experimental | Typed metric collection result. | | `core.dto.metric-definition` | dto | `Capell\Core\Data\Metrics\MetricDefinitionData` | `capell-app/core` | experimental | Versioned metric definition. | | `core.dto.metric-governance` | dto | `Capell\Core\Data\Metrics\MetricGovernanceData` | `capell-app/core` | experimental | Metric source and access governance. | | `core.dto.metric-identity` | dto | `Capell\Core\Data\Metrics\MetricIdentityData` | `capell-app/core` | experimental | Package-owned metric identity. | | `core.dto.metric-read-context` | dto | `Capell\Core\Data\Metrics\MetricReadContextData` | `capell-app/core` | experimental | Explicit metric read context. | | `core.dto.metric-representation` | dto | `Capell\Core\Data\Metrics\MetricRepresentationData` | `capell-app/core` | experimental | Fixed metric numeric representation. | | `core.dto.metric-sample` | dto | `Capell\Core\Data\Metrics\MetricSampleData` | `capell-app/core` | experimental | Typed daily metric sample. | | `core.dto.metric-scope` | dto | `Capell\Core\Data\Metrics\MetricScopeData` | `capell-app/core` | experimental | Portable metric scope. | | `core.dto.metric-semantics` | dto | `Capell\Core\Data\Metrics\MetricSemanticsData` | `capell-app/core` | experimental | Metric aggregation and gap semantics. | | `core.dto.metric-value` | dto | `Capell\Core\Data\Metrics\MetricValueData` | `capell-app/core` | experimental | Lossless metric numeric value. | | `core.dto.outbound-event-definition` | dto | `Capell\Core\Data\OutboundEventDefinitionData` | `capell-app/core` | experimental | Typed outbound event definition. | | `core.dto.project-build-artifact-reference` | dto | `Capell\Core\Data\ProjectBuild\ProjectBuildArtifactReferenceData` | `capell-app/core` | stable | Typed portable project build artifact reference. | | `core.dto.project-build-compatibility` | dto | `Capell\Core\Data\ProjectBuild\ProjectBuildCompatibilityData` | `capell-app/core` | stable | Typed portable project build compatibility requirements. | | `core.dto.project-build-installed-package` | dto | `Capell\Core\Data\ProjectBuild\ProjectBuildInstalledPackageData` | `capell-app/core` | stable | Verified installed package release evidence for project build consumers. | | `core.dto.project-build-manifest` | dto | `Capell\Core\Data\ProjectBuild\ProjectBuildManifestData` | `capell-app/core` | stable | Typed portable project build manifest envelope. | | `core.dto.project-build-package` | dto | `Capell\Core\Data\ProjectBuild\ProjectBuildPackageData` | `capell-app/core` | stable | Typed portable project build package reference. | | `core.dto.project-build-route` | dto | `Capell\Core\Data\ProjectBuild\ProjectBuildRouteData` | `capell-app/core` | stable | Typed portable project build route. | | `core.dto.project-build-signature` | dto | `Capell\Core\Data\ProjectBuild\ProjectBuildSignatureData` | `capell-app/core` | stable | Typed portable project build signature. | | `core.dto.project-build-site` | dto | `Capell\Core\Data\ProjectBuild\ProjectBuildSiteData` | `capell-app/core` | stable | Typed portable project build site. | | `core.dto.project-build-site-spec-reference` | dto | `Capell\Core\Data\ProjectBuild\ProjectBuildSiteSpecReferenceData` | `capell-app/core` | stable | Typed portable project build SiteSpec reference. | | `core.dto.publication-locale-status` | dto | `Capell\Core\Data\Publishing\PublicationLocaleStatusData` | `capell-app/core` | experimental | Canonical locale-scoped publication visibility status. | | `core.dto.publication-locale-status-context` | dto | `Capell\Core\Data\Publishing\PublicationLocaleStatusContextData` | `capell-app/core` | experimental | Explicit publishable record, site, language, and clock context for publication status. | | `core.dto.publication-readiness-check` | dto | `Capell\Core\Data\Publishing\PublicationReadinessCheckData` | `capell-app/core` | experimental | Typed publication readiness check result. | | `core.dto.publication-readiness-context` | dto | `Capell\Core\Data\Publishing\PublicationReadinessContextData` | `capell-app/core` | experimental | Explicit site and language context for publication readiness. | | `core.dto.reporting-health` | dto | `Capell\Core\Data\Reporting\ReportingHealthData` | `capell-app/core` | experimental | Aggregate non-cacheable health endpoint payload. | | `core.dto.reporting-incident` | dto | `Capell\Core\Data\Reporting\ReportingIncidentData` | `capell-app/core` | experimental | Immutable operational incident snapshot. | | `core.dto.reporting-redacted-signal` | dto | `Capell\Core\Data\Reporting\RedactedSignalData` | `capell-app/core` | experimental | Immutable redacted payload accepted by reporting transports. | | `core.dto.reporting-result` | dto | `Capell\Core\Data\Reporting\DispatchResultData` | `capell-app/core` | experimental | Reporting delivery, suppression and fallback outcome. | | `core.dto.reporting-signal` | dto | `Capell\Core\Data\Reporting\SignalData` | `capell-app/core` | experimental | Immutable raw operational signal input. | | `core.dto.sql-fragment` | dto | `Capell\Core\Data\Database\SqlFragment` | `capell-app/core` | experimental | Bound SQL fragment shared by database dialect contracts. | | `core.enum.database-capability` | enum | `Capell\Core\Enums\Database\DatabaseCapability` | `capell-app/core` | experimental | Portable database schema capabilities. | | `core.enum.database-date-operation` | enum | `Capell\Core\Enums\Database\DatabaseDateOperation` | `capell-app/core` | experimental | Portable database date operations. | | `core.enum.database-family` | enum | `Capell\Core\Enums\Database\DatabaseFamily` | `capell-app/core` | experimental | Supported database families. | | `core.enum.database-provisioning-result` | enum | `Capell\Core\Enums\Database\DatabaseProvisioningResult` | `capell-app/core` | experimental | Database provisioning outcomes. | | `core.enum.failure-category` | enum | `Capell\Core\Enums\Reporting\FailureCategory` | `capell-app/core` | stable | Stable operational failure category values. | | `core.enum.frontend-route-reservation-type` | enum | `Capell\Core\Enums\FrontendRouteReservationType` | `capell-app/core` | experimental | Supported frontend route reservation types. | | `core.enum.health-severity` | enum | `Capell\Core\Enums\Health\HealthSeverity` | `capell-app/core` | experimental | Operational health impact severities. | | `core.enum.health-status` | enum | `Capell\Core\Enums\Health\HealthStatus` | `capell-app/core` | experimental | Operational health outcomes. | | `core.enum.metric-aggregation` | enum | `Capell\Core\Enums\Metrics\MetricAggregation` | `capell-app/core` | experimental | Supported metric aggregations. | | `core.enum.metric-backfill-policy` | enum | `Capell\Core\Enums\Metrics\MetricBackfillPolicy` | `capell-app/core` | experimental | Supported metric backfill policies. | | `core.enum.metric-collection-status` | enum | `Capell\Core\Enums\Metrics\MetricCollectionStatus` | `capell-app/core` | experimental | Metric collection outcomes. | | `core.enum.metric-definition-status` | enum | `Capell\Core\Enums\Metrics\MetricDefinitionStatus` | `capell-app/core` | experimental | Metric definition lifecycle states. | | `core.enum.metric-gap-policy` | enum | `Capell\Core\Enums\Metrics\MetricGapPolicy` | `capell-app/core` | experimental | Supported metric gap policies. | | `core.enum.metric-reader-type` | enum | `Capell\Core\Enums\Metrics\MetricReaderType` | `capell-app/core` | experimental | Metric reader identity types. | | `core.enum.metric-scope-type` | enum | `Capell\Core\Enums\Metrics\MetricScopeType` | `capell-app/core` | experimental | Supported portable metric scopes. | | `core.enum.metric-semantic` | enum | `Capell\Core\Enums\Metrics\MetricSemantic` | `capell-app/core` | experimental | Supported metric semantic types. | | `core.enum.metric-sensitivity` | enum | `Capell\Core\Enums\Metrics\MetricSensitivity` | `capell-app/core` | experimental | Metric sensitivity classifications. | | `core.enum.metric-source` | enum | `Capell\Core\Enums\Metrics\MetricSource` | `capell-app/core` | experimental | Metric source kinds. | | `core.enum.metric-unit` | enum | `Capell\Core\Enums\MetricUnitEnum` | `capell-app/core` | experimental | Supported metric units. | | `core.enum.metric-value-type` | enum | `Capell\Core\Enums\Metrics\MetricValueType` | `capell-app/core` | experimental | Lossless metric value representations. | | `core.enum.metric-visibility` | enum | `Capell\Core\Enums\Metrics\MetricVisibility` | `capell-app/core` | experimental | Metric visibility boundaries. | | `core.enum.reporting-incident-status` | enum | `Capell\Core\Enums\Reporting\IncidentStatus` | `capell-app/core` | experimental | Open, acknowledged, escalated and resolved incident states. | | `core.enum.reporting-severity` | enum | `Capell\Core\Enums\Reporting\Severity` | `capell-app/core` | stable | Stable PSR log-level severity values. | | `core.enum.reporting-status` | enum | `Capell\Core\Enums\Reporting\DispatchStatus` | `capell-app/core` | experimental | Signal dispatch outcomes. | | `core.event.outbound-event-published` | event | `Capell\Core\Events\OutboundEventPublished` | `capell-app/core` | experimental | Announced outbound event with typed payload. | | `core.event.package-installed` | event | `Capell\Core\Events\PackageInstalled` | `capell-app/core` | stable | Package lifecycle completion event. | | `core.facade.capell-core` | facade | `Capell\Core\Facades\CapellCore` | `capell-app/core` | experimental | Runtime package and model registry facade. | | `core.facade.capell-database` | facade | `Capell\Core\Facades\CapellDatabase` | `capell-app/core` | experimental | Static database platform resolution facade. | | `core.internal.project-build-manifest-migration` | internal | `Capell\Core\Contracts\ProjectBuild\ProjectBuildManifestMigration` | `capell-app/core` | internal | Core-owned portable manifest migration boundary. | | `core.internal.registry-builder` | internal | `Capell\Core\Actions\Extensions\BuildExtensionContractRegistryAction` | `capell-app/core` | internal | Internal executable contribution index. | | `core.registry.blueprint-subject` | registry | `Capell\Core\Support\BlueprintSubjectRegistry` | `capell-app/core` | experimental | Runtime blueprint subject registry. | | `core.registry.database-platform` | registry | `Capell\Core\Support\Database\DatabasePlatformRegistry` | `capell-app/core` | experimental | Single runtime database platform resolution seam. | | `core.registry.extension-order-resolver` | registry | `Capell\Core\Support\Extensions\ExtensionOrderResolver` | `capell-app/core` | experimental | Deterministic shared extension ordering resolver. | | `core.registry.operational-health-check` | registry | `Capell\Core\Support\Health\HealthCheckRegistry` | `capell-app/core` | experimental | Deterministic operational health check registry. | | `core.registry.outbound-event` | registry | `Capell\Core\Support\OutboundEventRegistry` | `capell-app/core` | experimental | Boot-time outbound event definition registry. | | `core.registry.project-build-artifact-handler` | registry | `Capell\Core\Support\ProjectBuild\ProjectBuildArtifactHandlerRegistry` | `capell-app/core` | stable | Runtime registry for portable project build artifact handlers. | | `core.registry.publication-readiness` | registry | `Capell\Core\Support\Publishing\PublicationReadinessRegistry` | `capell-app/core` | experimental | Ordered runtime publication readiness contributor registry. | | `core.schema.project-build-manifest-v1` | schema | `Capell\Core\Support\ProjectBuild\ProjectBuildManifestSchema` | `capell-app/core` | experimental | Closed JSON Schema for portable project build manifests. | | `core.support.log-channel-reporter` | support | `Capell\Core\Support\Reporting\LogChannelReporter` | `capell-app/core` | experimental | Structured JSON delivery through the configured Laravel log channel. | | `core.tag.database-platform` | tagged-service | `capell.database.platform` | `capell-app/core` | experimental | Container tag for database platform adapters. | | `core.tag.extension-health` | tagged-service | `capell.extension-health-checks` | `capell-app/core` | experimental | Container tag for extension health checks. | | `core.tag.frontend-route-reservation-contributor` | tagged-service | `capell.frontend-route-reservation-contributor` | `capell-app/core` | experimental | Container tag for frontend route reservation contributors. | | `core.tag.interaction-target-capability-contributor` | tagged-service | `capell.interaction-target-capability-contributor` | `capell-app/core` | experimental | Container tag for interaction target capability contributors. | | `core.tag.operational-health-check` | tagged-service | `capell.health-checks` | `capell-app/core` | experimental | Container tag for bounded operational health checks. | | `core.tag.project-build-artifact-handler` | tagged-service | `capell.project-build.artifact-handler` | `capell-app/core` | stable | Container tag for project build artifact handlers. | | `core.tag.publication-readiness-contributor` | tagged-service | `capell.publication-readiness-contributor` | `capell-app/core` | experimental | Container tag for publication readiness contributors. | | `core.tag.site-spec-applier` | tagged-service | `capell.site-spec.applier` | `capell-app/core` | stable | Container tag for SiteSpec appliers. | | `core.testing.extension-harness` | testing | `Capell\Core\Testing\ExtensionTestHarness` | `capell-app/core` | stable | Manifest assertions plus real provider-bucket and receipt conformance checks. | | `core.dto.extension-position` | value-object | `Capell\Core\Support\Extensions\ExtensionPosition` | `capell-app/core` | experimental | Filament-neutral relative extension position. | | `frontend.contract.component-contributor` | contract | `Capell\Frontend\Contracts\FrontendComponentContributor` | `capell-app/frontend` | experimental | Typed frontend component contribution boundary. | | `frontend.contract.public-render-data-contributor` | contract | `Capell\Frontend\Contracts\PublicRenderDataContributor` | `capell-app/frontend` | experimental | Typed public render-data contribution boundary. | | `frontend.contract.widget-resource-usage-contributor` | contract | `Capell\Frontend\Contracts\FrontendWidgetResourceUsageContributor` | `capell-app/frontend` | experimental | Typed widget resource usage contribution boundary. | | `frontend.dto.component-contribution` | dto | `Capell\Frontend\Data\FrontendComponentContributionData` | `capell-app/frontend` | experimental | Named component contribution for a frontend runtime target. | | `frontend.dto.package-dependency` | dto | `Capell\Frontend\Data\Assets\FrontendPackageDependencyData` | `capell-app/frontend` | experimental | Typed frontend package dependency declaration. | | `frontend.dto.public-render-data-cache-dependency` | dto | `Capell\Frontend\Data\PublicRenderDataCacheDependencyData` | `capell-app/frontend` | experimental | Typed public render-data model dependency. | | `frontend.dto.public-render-data-contribution` | dto | `Capell\Frontend\Data\PublicRenderDataContributionData` | `capell-app/frontend` | experimental | Validated public render-data value. | | `frontend.dto.public-render-data-contribution-metadata` | dto | `Capell\Frontend\Data\PublicRenderDataContributionMetadataData` | `capell-app/frontend` | experimental | Cheap public render-data fingerprint and dependency metadata. | | `frontend.dto.widget-resource-usage` | dto | `Capell\Frontend\Data\Assets\FrontendWidgetResourceUsageData` | `capell-app/frontend` | experimental | Typed widget resource usage data. | | `frontend.enum.component-target` | enum | `Capell\Frontend\Enums\FrontendComponentTarget` | `capell-app/frontend` | experimental | Supported frontend component runtime targets. | | `frontend.enum.package-dependency-type` | enum | `Capell\Frontend\Enums\FrontendPackageDependencyType` | `capell-app/frontend` | experimental | Supported frontend package dependency installation types. | | `frontend.registry.package-dependency` | registry | `Capell\Frontend\Support\Assets\FrontendPackageDependencyRegistry` | `capell-app/frontend` | experimental | Registry for frontend package dependency declarations. | | `frontend.registry.public-render-data-cache-dependency` | registry | `Capell\Frontend\Support\Cache\PublicRenderDataCacheDependencyRegistry` | `capell-app/frontend` | experimental | Host-scoped public render-data cache dependency index. | | `frontend.registry.public-render-data-contributor` | registry | `Capell\Frontend\Support\Render\PublicRenderDataContributorRegistry` | `capell-app/frontend` | experimental | Deterministic public render-data contributor composition. | | `frontend.registry.render-hook` | registry | `Capell\Frontend\Support\Render\RenderHookRegistry` | `capell-app/frontend` | experimental | Owner-aware ordered Frontend render hooks. | | `frontend.tag.component-contributor` | tagged-service | `capell.frontend.component-contributor` | `capell-app/frontend` | experimental | Container tag for frontend component contributors. | | `frontend.tag.public-render-data-contributor` | tagged-service | `capell.frontend.public-render-data-contributor` | `capell-app/frontend` | experimental | Container tag for public render-data contributors. | | `frontend.tag.widget-resource-usage-contributor` | tagged-service | `capell.frontend.widget-resource-usage-contributor` | `capell-app/frontend` | experimental | Container tag for widget resource usage contributors. | | `marketplace.contract.composer-change-publisher` | contract | `Capell\Marketplace\Contracts\MarketplaceComposerChangePublisher` | `capell-app/marketplace` | experimental | Typed optional Composer change publication boundary. | | `marketplace.dto.composer-publication-request` | dto | `Capell\Marketplace\Data\MarketplaceComposerPublicationRequestData` | `capell-app/marketplace` | experimental | Typed Composer publication request data. | | `marketplace.dto.composer-publication-result` | dto | `Capell\Marketplace\Data\MarketplaceComposerPublicationResultData` | `capell-app/marketplace` | experimental | Typed Composer publication result data. | | `marketplace.tag.composer-change-publisher` | tagged-service | `capell.marketplace.composer-change-publisher` | `capell-app/marketplace` | experimental | Container tag for optional Composer change publishers. | ## Contract test references - `core.testing.extension-harness`: [ExtensionConformanceTest.php](https://github.com/capell-app/capell/blob/b052f23730ac6dcd3bf6a7470a4e95c12f06b443/tests/Feature/ExtensionConformanceTest.php#L24), [ExtensionConformanceFailureTest.php](https://github.com/capell-app/capell/blob/b052f23730ac6dcd3bf6a7470a4e95c12f06b443/tests/Feature/ExtensionConformanceFailureTest.php#L26) Stable entries have a direct contract test ID in the JSON catalogue. Experimental entries may change before the first public release. Internal entries are not extension APIs. Compatibility enforcement is active in `stable-extension-api-baseline.json`; drift requires an explicit compatibility decision and is never silently reformatted away.