diff --git a/prometeu-packer/build.gradle.kts b/prometeu-packer/build.gradle.kts
new file mode 100644
index 00000000..416c0cab
--- /dev/null
+++ b/prometeu-packer/build.gradle.kts
@@ -0,0 +1,7 @@
+plugins {
+    id("gradle.java-library-conventions")
+}
+
+dependencies {
+    implementation(project(":prometeu-infra"))
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/PackerOperationClass.java b/prometeu-packer/src/main/java/p/packer/api/PackerOperationClass.java
new file mode 100644
index 00000000..bd8b608c
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/PackerOperationClass.java
@@ -0,0 +1,7 @@
+package p.packer.api;
+
+public enum PackerOperationClass {
+    READ_ONLY,
+    REGISTRY_MUTATION,
+    WORKSPACE_MUTATION
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/PackerOperationStatus.java b/prometeu-packer/src/main/java/p/packer/api/PackerOperationStatus.java
new file mode 100644
index 00000000..25f50786
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/PackerOperationStatus.java
@@ -0,0 +1,7 @@
+package p.packer.api;
+
+public enum PackerOperationStatus {
+    SUCCESS,
+    PARTIAL,
+    FAILED
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/PackerProjectContext.java b/prometeu-packer/src/main/java/p/packer/api/PackerProjectContext.java
new file mode 100644
index 00000000..3290afcc
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/PackerProjectContext.java
@@ -0,0 +1,17 @@
+package p.packer.api;
+
+import java.nio.file.Path;
+import java.util.Objects;
+
+public record PackerProjectContext(
+        String projectId,
+        Path rootPath) {
+
+    public PackerProjectContext {
+        projectId = Objects.requireNonNull(projectId, "projectId").trim();
+        rootPath = Objects.requireNonNull(rootPath, "rootPath").toAbsolutePath().normalize();
+        if (projectId.isBlank()) {
+            throw new IllegalArgumentException("projectId must not be blank");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/assets/PackerAssetDetails.java b/prometeu-packer/src/main/java/p/packer/api/assets/PackerAssetDetails.java
new file mode 100644
index 00000000..f5a03313
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/assets/PackerAssetDetails.java
@@ -0,0 +1,24 @@
+package p.packer.api.assets;
+
+import p.packer.api.diagnostics.PackerDiagnostic;
+
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+
+public record PackerAssetDetails(
+        PackerAssetSummary summary,
+        String outputFormat,
+        String outputCodec,
+        Map<String, List<Path>> inputsByRole,
+        List<PackerDiagnostic> diagnostics) {
+
+    public PackerAssetDetails {
+        Objects.requireNonNull(summary, "summary");
+        outputFormat = Objects.requireNonNullElse(outputFormat, "unknown").trim();
+        outputCodec = Objects.requireNonNullElse(outputCodec, "unknown").trim();
+        inputsByRole = Map.copyOf(Objects.requireNonNull(inputsByRole, "inputsByRole"));
+        diagnostics = List.copyOf(Objects.requireNonNull(diagnostics, "diagnostics"));
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/assets/PackerAssetIdentity.java b/prometeu-packer/src/main/java/p/packer/api/assets/PackerAssetIdentity.java
new file mode 100644
index 00000000..5e247dda
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/assets/PackerAssetIdentity.java
@@ -0,0 +1,20 @@
+package p.packer.api.assets;
+
+import java.nio.file.Path;
+import java.util.Objects;
+
+public record PackerAssetIdentity(
+        Integer assetId,
+        String assetUuid,
+        String assetName,
+        Path assetRoot) {
+
+    public PackerAssetIdentity {
+        assetUuid = assetUuid == null ? null : assetUuid.trim();
+        assetName = Objects.requireNonNull(assetName, "assetName").trim();
+        assetRoot = Objects.requireNonNull(assetRoot, "assetRoot").toAbsolutePath().normalize();
+        if (assetName.isBlank()) {
+            throw new IllegalArgumentException("assetName must not be blank");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/assets/PackerAssetState.java b/prometeu-packer/src/main/java/p/packer/api/assets/PackerAssetState.java
new file mode 100644
index 00000000..a530c36e
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/assets/PackerAssetState.java
@@ -0,0 +1,7 @@
+package p.packer.api.assets;
+
+public enum PackerAssetState {
+    MANAGED,
+    ORPHAN,
+    INVALID
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/assets/PackerAssetSummary.java b/prometeu-packer/src/main/java/p/packer/api/assets/PackerAssetSummary.java
new file mode 100644
index 00000000..1ebb01f4
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/assets/PackerAssetSummary.java
@@ -0,0 +1,20 @@
+package p.packer.api.assets;
+
+import java.util.Objects;
+
+public record PackerAssetSummary(
+        PackerAssetIdentity identity,
+        PackerAssetState state,
+        String assetFamily,
+        boolean preloadEnabled,
+        boolean hasDiagnostics) {
+
+    public PackerAssetSummary {
+        Objects.requireNonNull(identity, "identity");
+        Objects.requireNonNull(state, "state");
+        assetFamily = Objects.requireNonNullElse(assetFamily, "unknown").trim();
+        if (assetFamily.isBlank()) {
+            assetFamily = "unknown";
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/diagnostics/PackerDiagnostic.java b/prometeu-packer/src/main/java/p/packer/api/diagnostics/PackerDiagnostic.java
new file mode 100644
index 00000000..c6848ede
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/diagnostics/PackerDiagnostic.java
@@ -0,0 +1,22 @@
+package p.packer.api.diagnostics;
+
+import java.nio.file.Path;
+import java.util.Objects;
+
+public record PackerDiagnostic(
+        PackerDiagnosticSeverity severity,
+        PackerDiagnosticCategory category,
+        String message,
+        Path evidencePath,
+        boolean blocking) {
+
+    public PackerDiagnostic {
+        Objects.requireNonNull(severity, "severity");
+        Objects.requireNonNull(category, "category");
+        message = Objects.requireNonNull(message, "message").trim();
+        evidencePath = evidencePath == null ? null : evidencePath.toAbsolutePath().normalize();
+        if (message.isBlank()) {
+            throw new IllegalArgumentException("message must not be blank");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/diagnostics/PackerDiagnosticCategory.java b/prometeu-packer/src/main/java/p/packer/api/diagnostics/PackerDiagnosticCategory.java
new file mode 100644
index 00000000..a2a9e6ce
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/diagnostics/PackerDiagnosticCategory.java
@@ -0,0 +1,9 @@
+package p.packer.api.diagnostics;
+
+public enum PackerDiagnosticCategory {
+    STRUCTURAL,
+    HYGIENE,
+    VERSIONING,
+    MIGRATION,
+    BUILD
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/diagnostics/PackerDiagnosticSeverity.java b/prometeu-packer/src/main/java/p/packer/api/diagnostics/PackerDiagnosticSeverity.java
new file mode 100644
index 00000000..30ad2c10
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/diagnostics/PackerDiagnosticSeverity.java
@@ -0,0 +1,7 @@
+package p.packer.api.diagnostics;
+
+public enum PackerDiagnosticSeverity {
+    INFO,
+    WARNING,
+    ERROR
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/doctor/PackerDoctorMode.java b/prometeu-packer/src/main/java/p/packer/api/doctor/PackerDoctorMode.java
new file mode 100644
index 00000000..2e07dc3c
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/doctor/PackerDoctorMode.java
@@ -0,0 +1,6 @@
+package p.packer.api.doctor;
+
+public enum PackerDoctorMode {
+    MANAGED_WORLD,
+    EXPANDED_WORKSPACE
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/doctor/PackerDoctorRequest.java b/prometeu-packer/src/main/java/p/packer/api/doctor/PackerDoctorRequest.java
new file mode 100644
index 00000000..6aaf1f04
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/doctor/PackerDoctorRequest.java
@@ -0,0 +1,16 @@
+package p.packer.api.doctor;
+
+import p.packer.api.PackerProjectContext;
+
+import java.util.Objects;
+
+public record PackerDoctorRequest(
+        PackerProjectContext project,
+        PackerDoctorMode mode,
+        boolean includeSafeFixes) {
+
+    public PackerDoctorRequest {
+        Objects.requireNonNull(project, "project");
+        Objects.requireNonNull(mode, "mode");
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/doctor/PackerDoctorResult.java b/prometeu-packer/src/main/java/p/packer/api/doctor/PackerDoctorResult.java
new file mode 100644
index 00000000..d1bb7321
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/doctor/PackerDoctorResult.java
@@ -0,0 +1,24 @@
+package p.packer.api.doctor;
+
+import p.packer.api.PackerOperationStatus;
+import p.packer.api.diagnostics.PackerDiagnostic;
+
+import java.util.List;
+import java.util.Objects;
+
+public record PackerDoctorResult(
+        PackerOperationStatus status,
+        String summary,
+        List<PackerDiagnostic> diagnostics,
+        List<String> safeFixes) {
+
+    public PackerDoctorResult {
+        Objects.requireNonNull(status, "status");
+        summary = Objects.requireNonNull(summary, "summary").trim();
+        diagnostics = List.copyOf(Objects.requireNonNull(diagnostics, "diagnostics"));
+        safeFixes = List.copyOf(Objects.requireNonNull(safeFixes, "safeFixes"));
+        if (summary.isBlank()) {
+            throw new IllegalArgumentException("summary must not be blank");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/doctor/PackerDoctorService.java b/prometeu-packer/src/main/java/p/packer/api/doctor/PackerDoctorService.java
new file mode 100644
index 00000000..060d4728
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/doctor/PackerDoctorService.java
@@ -0,0 +1,9 @@
+package p.packer.api.doctor;
+
+import p.packer.api.PackerOperationClass;
+
+public interface PackerDoctorService {
+    PackerOperationClass operationClass();
+
+    PackerDoctorResult doctor(PackerDoctorRequest request);
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/events/PackerEvent.java b/prometeu-packer/src/main/java/p/packer/api/events/PackerEvent.java
new file mode 100644
index 00000000..254e951d
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/events/PackerEvent.java
@@ -0,0 +1,31 @@
+package p.packer.api.events;
+
+import java.time.Instant;
+import java.util.List;
+import java.util.Objects;
+
+public record PackerEvent(
+        String projectId,
+        String operationId,
+        long sequence,
+        PackerEventKind kind,
+        Instant timestamp,
+        String summary,
+        PackerProgress progress,
+        List<String> affectedAssets) {
+
+    public PackerEvent {
+        projectId = Objects.requireNonNull(projectId, "projectId").trim();
+        operationId = Objects.requireNonNull(operationId, "operationId").trim();
+        Objects.requireNonNull(kind, "kind");
+        timestamp = Objects.requireNonNull(timestamp, "timestamp");
+        summary = Objects.requireNonNull(summary, "summary").trim();
+        affectedAssets = List.copyOf(Objects.requireNonNull(affectedAssets, "affectedAssets"));
+        if (projectId.isBlank() || operationId.isBlank() || summary.isBlank()) {
+            throw new IllegalArgumentException("projectId, operationId, and summary must not be blank");
+        }
+        if (sequence < 0L) {
+            throw new IllegalArgumentException("sequence must not be negative");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/events/PackerEventKind.java b/prometeu-packer/src/main/java/p/packer/api/events/PackerEventKind.java
new file mode 100644
index 00000000..ac2279b6
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/events/PackerEventKind.java
@@ -0,0 +1,15 @@
+package p.packer.api.events;
+
+public enum PackerEventKind {
+    ASSET_DISCOVERED,
+    ASSET_CHANGED,
+    DIAGNOSTICS_UPDATED,
+    BUILD_STARTED,
+    BUILD_FINISHED,
+    CACHE_HIT,
+    CACHE_MISS,
+    PREVIEW_READY,
+    ACTION_APPLIED,
+    ACTION_FAILED,
+    PROGRESS_UPDATED
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/events/PackerEventSink.java b/prometeu-packer/src/main/java/p/packer/api/events/PackerEventSink.java
new file mode 100644
index 00000000..e9fc9313
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/events/PackerEventSink.java
@@ -0,0 +1,11 @@
+package p.packer.api.events;
+
+@FunctionalInterface
+public interface PackerEventSink {
+    void publish(PackerEvent event);
+
+    static PackerEventSink noop() {
+        return ignored -> {
+        };
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/events/PackerProgress.java b/prometeu-packer/src/main/java/p/packer/api/events/PackerProgress.java
new file mode 100644
index 00000000..9ffc19f8
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/events/PackerProgress.java
@@ -0,0 +1,12 @@
+package p.packer.api.events;
+
+public record PackerProgress(
+        double value,
+        boolean indeterminate) {
+
+    public PackerProgress {
+        if (!indeterminate && (value < 0.0 || value > 1.0)) {
+            throw new IllegalArgumentException("value must be between 0.0 and 1.0 when determinate");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationPreview.java b/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationPreview.java
new file mode 100644
index 00000000..0472a05d
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationPreview.java
@@ -0,0 +1,35 @@
+package p.packer.api.mutations;
+
+import p.packer.api.PackerOperationStatus;
+import p.packer.api.diagnostics.PackerDiagnostic;
+
+import java.util.List;
+import java.util.Objects;
+
+public record PackerMutationPreview(
+        PackerOperationStatus status,
+        String summary,
+        String operationId,
+        PackerMutationRequest request,
+        List<PackerProposedAction> proposedActions,
+        List<PackerDiagnostic> diagnostics,
+        List<String> blockers,
+        boolean highRisk) {
+
+    public PackerMutationPreview {
+        Objects.requireNonNull(status, "status");
+        summary = Objects.requireNonNull(summary, "summary").trim();
+        operationId = Objects.requireNonNull(operationId, "operationId").trim();
+        Objects.requireNonNull(request, "request");
+        proposedActions = List.copyOf(Objects.requireNonNull(proposedActions, "proposedActions"));
+        diagnostics = List.copyOf(Objects.requireNonNull(diagnostics, "diagnostics"));
+        blockers = List.copyOf(Objects.requireNonNull(blockers, "blockers"));
+        if (summary.isBlank() || operationId.isBlank()) {
+            throw new IllegalArgumentException("summary and operationId must not be blank");
+        }
+    }
+
+    public boolean canApply() {
+        return blockers.isEmpty();
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationRequest.java b/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationRequest.java
new file mode 100644
index 00000000..3d437901
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationRequest.java
@@ -0,0 +1,23 @@
+package p.packer.api.mutations;
+
+import p.packer.api.PackerProjectContext;
+
+import java.nio.file.Path;
+import java.util.Objects;
+
+public record PackerMutationRequest(
+        PackerProjectContext project,
+        PackerMutationType type,
+        String assetReference,
+        Path targetRoot) {
+
+    public PackerMutationRequest {
+        Objects.requireNonNull(project, "project");
+        Objects.requireNonNull(type, "type");
+        assetReference = Objects.requireNonNull(assetReference, "assetReference").trim();
+        targetRoot = targetRoot == null ? null : targetRoot.toAbsolutePath().normalize();
+        if (assetReference.isBlank()) {
+            throw new IllegalArgumentException("assetReference must not be blank");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationResult.java b/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationResult.java
new file mode 100644
index 00000000..2436ce0e
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationResult.java
@@ -0,0 +1,26 @@
+package p.packer.api.mutations;
+
+import p.packer.api.PackerOperationStatus;
+import p.packer.api.diagnostics.PackerDiagnostic;
+
+import java.util.List;
+import java.util.Objects;
+
+public record PackerMutationResult(
+        PackerOperationStatus status,
+        String summary,
+        String operationId,
+        List<PackerProposedAction> appliedActions,
+        List<PackerDiagnostic> diagnostics) {
+
+    public PackerMutationResult {
+        Objects.requireNonNull(status, "status");
+        summary = Objects.requireNonNull(summary, "summary").trim();
+        operationId = Objects.requireNonNull(operationId, "operationId").trim();
+        appliedActions = List.copyOf(Objects.requireNonNull(appliedActions, "appliedActions"));
+        diagnostics = List.copyOf(Objects.requireNonNull(diagnostics, "diagnostics"));
+        if (summary.isBlank() || operationId.isBlank()) {
+            throw new IllegalArgumentException("summary and operationId must not be blank");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationService.java b/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationService.java
new file mode 100644
index 00000000..97af4c8b
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationService.java
@@ -0,0 +1,11 @@
+package p.packer.api.mutations;
+
+import p.packer.api.PackerOperationClass;
+
+public interface PackerMutationService {
+    PackerOperationClass operationClass();
+
+    PackerMutationPreview preview(PackerMutationRequest request);
+
+    PackerMutationResult apply(PackerMutationPreview preview);
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationType.java b/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationType.java
new file mode 100644
index 00000000..0e9203d5
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/mutations/PackerMutationType.java
@@ -0,0 +1,10 @@
+package p.packer.api.mutations;
+
+public enum PackerMutationType {
+    REGISTER_ASSET,
+    ADOPT_ASSET,
+    FORGET_ASSET,
+    REMOVE_ASSET,
+    QUARANTINE_ASSET,
+    RELOCATE_ASSET
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/mutations/PackerProposedAction.java b/prometeu-packer/src/main/java/p/packer/api/mutations/PackerProposedAction.java
new file mode 100644
index 00000000..15b04014
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/mutations/PackerProposedAction.java
@@ -0,0 +1,20 @@
+package p.packer.api.mutations;
+
+import p.packer.api.PackerOperationClass;
+
+import java.util.Objects;
+
+public record PackerProposedAction(
+        PackerOperationClass operationClass,
+        String verb,
+        String target) {
+
+    public PackerProposedAction {
+        Objects.requireNonNull(operationClass, "operationClass");
+        verb = Objects.requireNonNull(verb, "verb").trim();
+        target = Objects.requireNonNull(target, "target").trim();
+        if (verb.isBlank() || target.isBlank()) {
+            throw new IllegalArgumentException("verb and target must not be blank");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/workspace/GetAssetDetailsRequest.java b/prometeu-packer/src/main/java/p/packer/api/workspace/GetAssetDetailsRequest.java
new file mode 100644
index 00000000..bfe30543
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/workspace/GetAssetDetailsRequest.java
@@ -0,0 +1,18 @@
+package p.packer.api.workspace;
+
+import p.packer.api.PackerProjectContext;
+
+import java.util.Objects;
+
+public record GetAssetDetailsRequest(
+        PackerProjectContext project,
+        String assetReference) {
+
+    public GetAssetDetailsRequest {
+        Objects.requireNonNull(project, "project");
+        assetReference = Objects.requireNonNull(assetReference, "assetReference").trim();
+        if (assetReference.isBlank()) {
+            throw new IllegalArgumentException("assetReference must not be blank");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/workspace/GetAssetDetailsResult.java b/prometeu-packer/src/main/java/p/packer/api/workspace/GetAssetDetailsResult.java
new file mode 100644
index 00000000..49584579
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/workspace/GetAssetDetailsResult.java
@@ -0,0 +1,25 @@
+package p.packer.api.workspace;
+
+import p.packer.api.PackerOperationStatus;
+import p.packer.api.assets.PackerAssetDetails;
+import p.packer.api.diagnostics.PackerDiagnostic;
+
+import java.util.List;
+import java.util.Objects;
+
+public record GetAssetDetailsResult(
+        PackerOperationStatus status,
+        String summary,
+        PackerAssetDetails details,
+        List<PackerDiagnostic> diagnostics) {
+
+    public GetAssetDetailsResult {
+        Objects.requireNonNull(status, "status");
+        summary = Objects.requireNonNull(summary, "summary").trim();
+        Objects.requireNonNull(details, "details");
+        diagnostics = List.copyOf(Objects.requireNonNull(diagnostics, "diagnostics"));
+        if (summary.isBlank()) {
+            throw new IllegalArgumentException("summary must not be blank");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/workspace/InitWorkspaceRequest.java b/prometeu-packer/src/main/java/p/packer/api/workspace/InitWorkspaceRequest.java
new file mode 100644
index 00000000..b1354290
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/workspace/InitWorkspaceRequest.java
@@ -0,0 +1,13 @@
+package p.packer.api.workspace;
+
+import p.packer.api.PackerProjectContext;
+
+import java.util.Objects;
+
+public record InitWorkspaceRequest(
+        PackerProjectContext project) {
+
+    public InitWorkspaceRequest {
+        Objects.requireNonNull(project, "project");
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/workspace/InitWorkspaceResult.java b/prometeu-packer/src/main/java/p/packer/api/workspace/InitWorkspaceResult.java
new file mode 100644
index 00000000..4b0ae31f
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/workspace/InitWorkspaceResult.java
@@ -0,0 +1,25 @@
+package p.packer.api.workspace;
+
+import p.packer.api.PackerOperationStatus;
+import p.packer.api.diagnostics.PackerDiagnostic;
+
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Objects;
+
+public record InitWorkspaceResult(
+        PackerOperationStatus status,
+        String summary,
+        Path registryPath,
+        List<PackerDiagnostic> diagnostics) {
+
+    public InitWorkspaceResult {
+        Objects.requireNonNull(status, "status");
+        summary = Objects.requireNonNull(summary, "summary").trim();
+        registryPath = Objects.requireNonNull(registryPath, "registryPath").toAbsolutePath().normalize();
+        diagnostics = List.copyOf(Objects.requireNonNull(diagnostics, "diagnostics"));
+        if (summary.isBlank()) {
+            throw new IllegalArgumentException("summary must not be blank");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/workspace/ListAssetsRequest.java b/prometeu-packer/src/main/java/p/packer/api/workspace/ListAssetsRequest.java
new file mode 100644
index 00000000..68f4122e
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/workspace/ListAssetsRequest.java
@@ -0,0 +1,13 @@
+package p.packer.api.workspace;
+
+import p.packer.api.PackerProjectContext;
+
+import java.util.Objects;
+
+public record ListAssetsRequest(
+        PackerProjectContext project) {
+
+    public ListAssetsRequest {
+        Objects.requireNonNull(project, "project");
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/workspace/ListAssetsResult.java b/prometeu-packer/src/main/java/p/packer/api/workspace/ListAssetsResult.java
new file mode 100644
index 00000000..538edc0f
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/workspace/ListAssetsResult.java
@@ -0,0 +1,25 @@
+package p.packer.api.workspace;
+
+import p.packer.api.PackerOperationStatus;
+import p.packer.api.assets.PackerAssetSummary;
+import p.packer.api.diagnostics.PackerDiagnostic;
+
+import java.util.List;
+import java.util.Objects;
+
+public record ListAssetsResult(
+        PackerOperationStatus status,
+        String summary,
+        List<PackerAssetSummary> assets,
+        List<PackerDiagnostic> diagnostics) {
+
+    public ListAssetsResult {
+        Objects.requireNonNull(status, "status");
+        summary = Objects.requireNonNull(summary, "summary").trim();
+        assets = List.copyOf(Objects.requireNonNull(assets, "assets"));
+        diagnostics = List.copyOf(Objects.requireNonNull(diagnostics, "diagnostics"));
+        if (summary.isBlank()) {
+            throw new IllegalArgumentException("summary must not be blank");
+        }
+    }
+}
diff --git a/prometeu-packer/src/main/java/p/packer/api/workspace/PackerWorkspaceService.java b/prometeu-packer/src/main/java/p/packer/api/workspace/PackerWorkspaceService.java
new file mode 100644
index 00000000..0d2fe4a7
--- /dev/null
+++ b/prometeu-packer/src/main/java/p/packer/api/workspace/PackerWorkspaceService.java
@@ -0,0 +1,13 @@
+package p.packer.api.workspace;
+
+import p.packer.api.PackerOperationClass;
+
+public interface PackerWorkspaceService {
+    PackerOperationClass operationClass();
+
+    InitWorkspaceResult initWorkspace(InitWorkspaceRequest request);
+
+    ListAssetsResult listAssets(ListAssetsRequest request);
+
+    GetAssetDetailsResult getAssetDetails(GetAssetDetailsRequest request);
+}
diff --git a/prometeu-packer/src/test/java/p/packer/testing/PackerFixtureCatalogTest.java b/prometeu-packer/src/test/java/p/packer/testing/PackerFixtureCatalogTest.java
new file mode 100644
index 00000000..75d38857
--- /dev/null
+++ b/prometeu-packer/src/test/java/p/packer/testing/PackerFixtureCatalogTest.java
@@ -0,0 +1,21 @@
+package p.packer.testing;
+
+import org.junit.jupiter.api.Test;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+final class PackerFixtureCatalogTest {
+    @Test
+    void exposesWorkspaceFixturesForFuturePackerTests() {
+        final Path emptyWorkspace = PackerFixtureLocator.fixtureRoot("workspaces/empty");
+        final Path managedWorkspace = PackerFixtureLocator.fixtureRoot("workspaces/managed-basic");
+
+        assertTrue(Files.isDirectory(emptyWorkspace));
+        assertTrue(Files.isDirectory(managedWorkspace));
+        assertTrue(Files.isRegularFile(managedWorkspace.resolve("assets/.prometeu/index.json")));
+        assertTrue(Files.isRegularFile(managedWorkspace.resolve("assets/ui/atlas/asset.json")));
+    }
+}
diff --git a/prometeu-packer/src/test/java/p/packer/testing/PackerFixtureLocator.java b/prometeu-packer/src/test/java/p/packer/testing/PackerFixtureLocator.java
new file mode 100644
index 00000000..e05545db
--- /dev/null
+++ b/prometeu-packer/src/test/java/p/packer/testing/PackerFixtureLocator.java
@@ -0,0 +1,23 @@
+package p.packer.testing;
+
+import java.net.URL;
+import java.nio.file.Path;
+import java.util.Objects;
+
+public final class PackerFixtureLocator {
+    private PackerFixtureLocator() {
+    }
+
+    public static Path fixtureRoot(String relativePath) {
+        final String normalized = Objects.requireNonNull(relativePath, "relativePath").replace('\\', '/');
+        final URL resource = PackerFixtureLocator.class.getClassLoader().getResource("fixtures/" + normalized);
+        if (resource == null) {
+            throw new IllegalArgumentException("fixture not found: " + normalized);
+        }
+        try {
+            return Path.of(resource.toURI()).toAbsolutePath().normalize();
+        } catch (Exception exception) {
+            throw new IllegalStateException("unable to resolve fixture: " + normalized, exception);
+        }
+    }
+}
diff --git a/prometeu-packer/src/test/resources/fixtures/workspaces/empty/.gitkeep b/prometeu-packer/src/test/resources/fixtures/workspaces/empty/.gitkeep
new file mode 100644
index 00000000..8b137891
--- /dev/null
+++ b/prometeu-packer/src/test/resources/fixtures/workspaces/empty/.gitkeep
@@ -0,0 +1 @@
+
diff --git a/prometeu-packer/src/test/resources/fixtures/workspaces/managed-basic/assets/.prometeu/index.json b/prometeu-packer/src/test/resources/fixtures/workspaces/managed-basic/assets/.prometeu/index.json
new file mode 100644
index 00000000..b6b75c4f
--- /dev/null
+++ b/prometeu-packer/src/test/resources/fixtures/workspaces/managed-basic/assets/.prometeu/index.json
@@ -0,0 +1,11 @@
+{
+  "schema_version": 1,
+  "next_asset_id": 2,
+  "assets": [
+    {
+      "asset_id": 1,
+      "asset_uuid": "fixture-uuid-1",
+      "root": "ui/atlas"
+    }
+  ]
+}
diff --git a/prometeu-packer/src/test/resources/fixtures/workspaces/managed-basic/assets/ui/atlas/asset.json b/prometeu-packer/src/test/resources/fixtures/workspaces/managed-basic/assets/ui/atlas/asset.json
new file mode 100644
index 00000000..66c95444
--- /dev/null
+++ b/prometeu-packer/src/test/resources/fixtures/workspaces/managed-basic/assets/ui/atlas/asset.json
@@ -0,0 +1,15 @@
+{
+  "schema_version": 1,
+  "name": "ui_atlas",
+  "type": "image_bank",
+  "inputs": {
+    "sprites": ["sprites/confirm.png"]
+  },
+  "output": {
+    "format": "TILES/indexed_v1",
+    "codec": "RAW"
+  },
+  "preload": {
+    "enabled": true
+  }
+}
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 823a09bb..9358a877 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -5,6 +5,7 @@ plugins {
 rootProject.name = "prometeu-studio"
 
 include("prometeu-infra")
+include("prometeu-packer")
 
 include("prometeu-compiler:frontends:prometeu-frontend-pbs")
 include("prometeu-compiler:prometeu-compiler-core")