diff --git a/package-lock.json b/package-lock.json
index 7da80e6..5b058d9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,7 +16,7 @@
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@@ -1967,9 +1967,9 @@
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@@ -1980,9 +1980,9 @@
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     "@rollup/rollup-win32-arm64-msvc": {
-      "version": "4.21.3",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-arm64-msvc/-/rollup-win32-arm64-msvc-4.21.3.tgz",
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+      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-arm64-msvc/-/rollup-win32-arm64-msvc-4.22.5.tgz",
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     },
     "@rollup/rollup-win32-ia32-msvc": {
-      "version": "4.21.3",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-ia32-msvc/-/rollup-win32-ia32-msvc-4.21.3.tgz",
-      "integrity": "sha512-nMIdKnfZfzn1Vsk+RuOvl43ONTZXoAPUUxgcU0tXooqg4YrAqzfKzVenqqk2g5efWh46/D28cKFrOzDSW28gTA==",
+      "version": "4.22.5",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-ia32-msvc/-/rollup-win32-ia32-msvc-4.22.5.tgz",
+      "integrity": "sha512-ElTYOh50InL8kzyUD6XsnPit7jYCKrphmddKAe1/Ytt74apOxDq5YEcbsiKs0fR3vff3jEneMM+3I7jbqaMyBg==",
       "dev": true,
       "optional": true
     },
     "@rollup/rollup-win32-x64-msvc": {
-      "version": "4.21.3",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-x64-msvc/-/rollup-win32-x64-msvc-4.21.3.tgz",
-      "integrity": "sha512-fOvu7PCQjAj4eWDEuD8Xz5gpzFqXzGlxHZozHP4b9Jxv9APtdxL6STqztDzMLuRXEc4UpXGGhx029Xgm91QBeA==",
+      "version": "4.22.5",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-x64-msvc/-/rollup-win32-x64-msvc-4.22.5.tgz",
+      "integrity": "sha512-+lvL/4mQxSV8MukpkKyyvfwhH266COcWlXE/1qxwN08ajovta3459zrjLghYMgDerlzNwLAcFpvU+WWE5y6nAQ==",
       "dev": true,
       "optional": true
     },
@@ -8853,9 +8853,9 @@
       }
     },
     "@types/emscripten": {
-      "version": "1.39.10",
-      "resolved": "https://registry.npmjs.org/@types/emscripten/-/emscripten-1.39.10.tgz",
-      "integrity": "sha512-TB/6hBkYQJxsZHSqyeuO1Jt0AB/bW6G7rHt9g7lML7SOF6lbgcHvw/Lr+69iqN0qxgXLhWKScAon73JNnptuDw==",
+      "version": "1.39.13",
+      "resolved": "https://registry.npmjs.org/@types/emscripten/-/emscripten-1.39.13.tgz",
+      "integrity": "sha512-cFq+fO/isvhvmuP/+Sl4K4jtU6E23DoivtbO4r50e3odaxAiVdbfSYRDdJ4gCdxx+3aRjhphS5ZMwIH4hFy/Cw==",
       "dev": true
     },
     "@types/eslint": {
@@ -8878,9 +8878,9 @@
       }
     },
     "@types/estree": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.5.tgz",
-      "integrity": "sha512-/kYRxGDLWzHOB7q+wtSUQlFrtcdUccpfy+X+9iMBpHK8QLLhx2wIPYuS5DYtR9Wa/YlZAbIovy7qVdB1Aq6Lyw==",
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.6.tgz",
+      "integrity": "sha512-AYnb1nQyY49te+VRAVgmzfcgjYS91mY5P0TKUDCLEM+gNnA+3T6rWITXRLYCpahpqSQbN5cE+gHpnPyXjHWxcw==",
       "dev": true
     },
     "@types/fs-extra": {
@@ -11866,28 +11866,28 @@
       }
     },
     "rollup": {
-      "version": "4.21.3",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.21.3.tgz",
-      "integrity": "sha512-7sqRtBNnEbcBtMeRVc6VRsJMmpI+JU1z9VTvW8D4gXIYQFz0aLcsE6rRkyghZkLfEgUZgVvOG7A5CVz/VW5GIA==",
-      "dev": true,
-      "requires": {
-        "@rollup/rollup-android-arm-eabi": "4.21.3",
-        "@rollup/rollup-android-arm64": "4.21.3",
-        "@rollup/rollup-darwin-arm64": "4.21.3",
-        "@rollup/rollup-darwin-x64": "4.21.3",
-        "@rollup/rollup-linux-arm-gnueabihf": "4.21.3",
-        "@rollup/rollup-linux-arm-musleabihf": "4.21.3",
-        "@rollup/rollup-linux-arm64-gnu": "4.21.3",
-        "@rollup/rollup-linux-arm64-musl": "4.21.3",
-        "@rollup/rollup-linux-powerpc64le-gnu": "4.21.3",
-        "@rollup/rollup-linux-riscv64-gnu": "4.21.3",
-        "@rollup/rollup-linux-s390x-gnu": "4.21.3",
-        "@rollup/rollup-linux-x64-gnu": "4.21.3",
-        "@rollup/rollup-linux-x64-musl": "4.21.3",
-        "@rollup/rollup-win32-arm64-msvc": "4.21.3",
-        "@rollup/rollup-win32-ia32-msvc": "4.21.3",
-        "@rollup/rollup-win32-x64-msvc": "4.21.3",
-        "@types/estree": "1.0.5",
+      "version": "4.22.5",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.22.5.tgz",
+      "integrity": "sha512-WoinX7GeQOFMGznEcWA1WrTQCd/tpEbMkc3nuMs9BT0CPjMdSjPMTVClwWd4pgSQwJdP65SK9mTCNvItlr5o7w==",
+      "dev": true,
+      "requires": {
+        "@rollup/rollup-android-arm-eabi": "4.22.5",
+        "@rollup/rollup-android-arm64": "4.22.5",
+        "@rollup/rollup-darwin-arm64": "4.22.5",
+        "@rollup/rollup-darwin-x64": "4.22.5",
+        "@rollup/rollup-linux-arm-gnueabihf": "4.22.5",
+        "@rollup/rollup-linux-arm-musleabihf": "4.22.5",
+        "@rollup/rollup-linux-arm64-gnu": "4.22.5",
+        "@rollup/rollup-linux-arm64-musl": "4.22.5",
+        "@rollup/rollup-linux-powerpc64le-gnu": "4.22.5",
+        "@rollup/rollup-linux-riscv64-gnu": "4.22.5",
+        "@rollup/rollup-linux-s390x-gnu": "4.22.5",
+        "@rollup/rollup-linux-x64-gnu": "4.22.5",
+        "@rollup/rollup-linux-x64-musl": "4.22.5",
+        "@rollup/rollup-win32-arm64-msvc": "4.22.5",
+        "@rollup/rollup-win32-ia32-msvc": "4.22.5",
+        "@rollup/rollup-win32-x64-msvc": "4.22.5",
+        "@types/estree": "1.0.6",
         "fsevents": "~2.3.2"
       }
     },
@@ -12446,9 +12446,9 @@
           }
         },
         "rollup": {
-          "version": "2.79.1",
-          "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.79.1.tgz",
-          "integrity": "sha512-uKxbd0IhMZOhjAiD5oAFp7BqvkA4Dv47qpOCtaNvng4HBwdbWtdOh8f5nZNuk2rp51PMGk3bzfWu5oayNEuYnw==",
+          "version": "2.79.2",
+          "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.79.2.tgz",
+          "integrity": "sha512-fS6iqSPZDs3dr/y7Od6y5nha8dW1YnbgtsyotCVvoFGKbERG++CVRFv1meyGDE1SNItQA8BrnCw7ScdAhRJ3XQ==",
           "dev": true,
           "requires": {
             "fsevents": "~2.3.2"
diff --git a/package.json b/package.json
index 59802b5..b23a830 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "@eslint/js": "^9.10.0",
     "@rollup/plugin-terser": "^0.4.4",
     "@rollup/plugin-typescript": "^11.1.6",
-    "@types/emscripten": "^1.39.10",
+    "@types/emscripten": "^1.39.13",
     "@types/eslint__js": "^8.42.3",
     "@types/node": "^20.16.5",
     "@types/nunjucks": "^3.2.6",
diff --git a/src/client/base.ts b/src/client/base.ts
index a1e4cdc..773c45d 100644
--- a/src/client/base.ts
+++ b/src/client/base.ts
@@ -1,9 +1,10 @@
-import type { Trainee } from "@/types";
+import type { FeatureAttributesIndex, Trainee } from "@/types";
 import { DEFAULT_ERROR_MESSAGE, HowsoError, HowsoValidationError } from "./errors";
 import type { CacheMap } from "./utilities/cache";
 
 export interface ClientCache {
   trainee: Trainee;
+  feature_attributes?: FeatureAttributesIndex;
 }
 
 export interface ExecuteResponse<R = unknown> {
diff --git a/src/client/worker/client.ts b/src/client/worker/client.ts
index 73fe542..70ab4b0 100644
--- a/src/client/worker/client.ts
+++ b/src/client/worker/client.ts
@@ -25,7 +25,7 @@ export interface ClientOptions {
 export class HowsoWorkerClient extends TraineeClient {
   public readonly fs: FileSystemClient;
   protected activeSession?: Session;
-  protected cache: CacheMap<ClientCache>;
+  protected cache: CacheMap<Required<ClientCache>>;
 
   constructor(
     protected readonly worker: Worker,
@@ -129,9 +129,7 @@ export class HowsoWorkerClient extends TraineeClient {
     if (traineeId == null) {
       throw new TypeError("A Trainee identifier is required.");
     }
-    if (!this.cache.has(traineeId)) {
-      await this.acquireTraineeResources(traineeId);
-    }
+    await this.acquireTraineeResources(traineeId); // does nothing if already cached
     const cached = this.cache.get(traineeId);
     if (cached == null) {
       throw new HowsoError(`Trainee "${traineeId}" not found.`, "not_found");
@@ -154,9 +152,9 @@ export class HowsoWorkerClient extends TraineeClient {
    * Constructs Trainee object from it's Engine metadata.
    *
    * @param traineeId The Trainee identifier.
-   * @returns The Trainee object.
+   * @returns The Trainee object and its feature attributes.
    */
-  protected async getTraineeFromEngine(traineeId: string): Promise<Trainee> {
+  protected async getTraineeFromEngine(traineeId: string): Promise<[Trainee, FeatureAttributesIndex]> {
     const [metadata, features] = await Promise.all([
       this.execute<any>(traineeId, "get_metadata", {}),
       this.execute<FeatureAttributesIndex>(traineeId, "get_feature_attributes", {}),
@@ -164,13 +162,15 @@ export class HowsoWorkerClient extends TraineeClient {
     if (!metadata?.payload) {
       throw new HowsoError(`Trainee "${traineeId}" not found.`, "not_found");
     }
-    return {
-      id: traineeId,
-      name: metadata?.payload?.name,
-      features: features?.payload,
-      persistence: metadata?.payload?.persistence ?? "allow",
-      metadata: metadata?.payload?.metadata,
-    };
+    return [
+      {
+        id: traineeId,
+        name: metadata?.payload?.name,
+        persistence: metadata?.payload?.persistence ?? "allow",
+        metadata: metadata?.payload?.metadata,
+      },
+      features?.payload,
+    ];
   }
 
   /**
@@ -257,11 +257,17 @@ export class HowsoWorkerClient extends TraineeClient {
     }
 
     const filename = this.fs.traineeFilename(traineeId);
+    const filePath = this.fs.join(this.fs.traineeDir, filename);
     if (url) {
       // Prepare the file on the virtual file system
       await this.fs.prepareFile(this.fs.traineeDir, filename, url);
     }
 
+    const fileStat = await this.fs.analyzePath(filePath);
+    if (!fileStat?.exists) {
+      throw new HowsoError(`Trainee "${traineeId}" not found.`, "not_found");
+    }
+
     // Load Trainee only if entity not already loaded
     const loaded = await this.getEntities();
     if (loaded.indexOf(traineeId) == -1) {
@@ -269,7 +275,7 @@ export class HowsoWorkerClient extends TraineeClient {
       const status = await this.dispatch({
         type: "request",
         command: "loadEntity",
-        parameters: [traineeId, this.fs.join(this.fs.traineeDir, filename)],
+        parameters: [traineeId, filePath],
       });
       if (!status.loaded) {
         throw new HowsoError(`Failed to acquire the Trainee "${traineeId}": ${status.message}`);
@@ -277,9 +283,9 @@ export class HowsoWorkerClient extends TraineeClient {
     }
 
     // Get Trainee details. Use the internal method to prevent auto resolution loops.
-    const trainee = await this.getTraineeFromEngine(traineeId);
+    const [trainee, feature_attributes] = await this.getTraineeFromEngine(traineeId);
     // Cache the Trainee
-    this.cache.set(traineeId, { trainee });
+    this.cache.set(traineeId, { trainee, feature_attributes });
   }
 
   /**
@@ -339,23 +345,14 @@ export class HowsoWorkerClient extends TraineeClient {
     // Set Trainee metadata
     const metadata = {
       name: trainee.name,
-      metadata: structuredClone(trainee.metadata || {}),
+      metadata: trainee.metadata || {},
       persistence: trainee.persistence || "allow",
     };
     await this.execute(traineeId, "set_metadata", { metadata });
 
-    // Set the feature attributes
-    const { payload: feature_attributes } = await this.execute<FeatureAttributesIndex>(
-      traineeId,
-      "set_feature_attributes",
-      {
-        feature_attributes: trainee.features || {},
-      },
-    );
-
     // Build, cache and return new trainee object
-    const newTrainee: Trainee = { id: traineeId, features: feature_attributes, ...metadata };
-    this.cache.set(traineeId, { trainee: newTrainee });
+    const newTrainee: Trainee = { id: traineeId, ...metadata };
+    this.cache.set(traineeId, { trainee: structuredClone(newTrainee), feature_attributes: {} });
     return newTrainee;
   }
 
@@ -363,11 +360,20 @@ export class HowsoWorkerClient extends TraineeClient {
    * Update a Trainee's properties.
    * @param trainee The Trainee identifier.
    */
-  public async updateTrainee(
-    /* eslint-disable-next-line @typescript-eslint/no-unused-vars */
-    trainee: Trainee,
-  ): Promise<Trainee> {
-    throw new Error("Method not implemented.");
+  public async updateTrainee(trainee: Trainee): Promise<Trainee> {
+    await this.autoResolveTrainee(trainee.id);
+
+    // Set Trainee metadata
+    const metadata = {
+      name: trainee.name,
+      metadata: trainee.metadata || {},
+      persistence: trainee.persistence || "allow",
+    };
+    await this.execute(trainee.id, "set_metadata", { metadata });
+
+    const [updatedTrainee, feature_attributes] = await this.getTraineeFromEngine(trainee.id);
+    this.cache.set(trainee.id, { trainee: structuredClone(updatedTrainee), feature_attributes });
+    return updatedTrainee;
   }
 
   /**
@@ -377,7 +383,8 @@ export class HowsoWorkerClient extends TraineeClient {
    */
   public async getTrainee(traineeId: string): Promise<Trainee> {
     await this.autoResolveTrainee(traineeId);
-    return await this.getTraineeFromEngine(traineeId); // Get latest Trainee from Engine
+    const [trainee] = await this.getTraineeFromEngine(traineeId); // Get latest Trainee from Engine
+    return trainee;
   }
 
   /**
@@ -404,8 +411,8 @@ export class HowsoWorkerClient extends TraineeClient {
     await this.execute(newTraineeId, "set_metadata", { metadata });
 
     // Get fresh copy of the trainee object
-    const newTrainee = await this.getTraineeFromEngine(newTraineeId);
-    this.cache.set(newTraineeId, { trainee: newTrainee });
+    const [newTrainee, feature_attributes] = await this.getTraineeFromEngine(newTraineeId);
+    this.cache.set(newTraineeId, { trainee: structuredClone(newTrainee), feature_attributes });
     return newTrainee;
   }
 
@@ -459,9 +466,9 @@ export class HowsoWorkerClient extends TraineeClient {
   public async setFeatureAttributes(traineeId: string, request: schemas.SetFeatureAttributesRequest) {
     const response = await super.setFeatureAttributes(traineeId, request);
     // Also update cached Trainee
-    const trainee = this.cache.get(traineeId)?.trainee;
-    if (trainee) {
-      trainee.features = response.payload;
+    const cached = this.cache.get(traineeId);
+    if (cached) {
+      cached.feature_attributes = structuredClone(response.payload);
     }
     return response;
   }
@@ -469,10 +476,10 @@ export class HowsoWorkerClient extends TraineeClient {
   public async addFeature(traineeId: string, request: schemas.AddFeatureRequest) {
     const response = await super.addFeature(traineeId, request);
     // Also update cached Trainee
-    const trainee = this.cache.get(traineeId)?.trainee;
-    if (trainee) {
+    const cached = this.cache.get(traineeId);
+    if (cached) {
       const { payload: features } = await this.getFeatureAttributes(traineeId);
-      trainee.features = features;
+      cached.feature_attributes = features;
     }
     return response;
   }
@@ -480,10 +487,10 @@ export class HowsoWorkerClient extends TraineeClient {
   public async removeFeature(traineeId: string, request: schemas.RemoveFeatureRequest) {
     const response = await super.removeFeature(traineeId, request);
     // Also update cached Trainee
-    const trainee = this.cache.get(traineeId)?.trainee;
-    if (trainee) {
+    const cached = this.cache.get(traineeId);
+    if (cached) {
       const { payload: features } = await this.getFeatureAttributes(traineeId);
-      trainee.features = features;
+      cached.feature_attributes = features;
     }
     return response;
   }
diff --git a/src/client/worker/files.ts b/src/client/worker/files.ts
index 92385e6..2c94ce2 100644
--- a/src/client/worker/files.ts
+++ b/src/client/worker/files.ts
@@ -73,6 +73,14 @@ export class FileSystemClient implements IFileSystem {
     }
   }
 
+  public async analyzePath(path: string, dontResolveLastLink?: boolean): Promise<FS.Analyze> {
+    return await this.dispatch({
+      type: "request",
+      command: "analyzePath",
+      parameters: [path, dontResolveLastLink],
+    });
+  }
+
   public async createLazyFile(
     parent: string,
     name: string,
@@ -89,7 +97,7 @@ export class FileSystemClient implements IFileSystem {
 
   public async writeFile(
     path: string,
-    data: string | DataView | ArrayBufferView,
+    data: string | ArrayBufferView,
     opts?: { flags?: string | undefined },
   ): Promise<void> {
     await this.dispatch({
diff --git a/src/types/trainee.ts b/src/types/trainee.ts
index 2e6c91e..57dbb75 100644
--- a/src/types/trainee.ts
+++ b/src/types/trainee.ts
@@ -1,5 +1,3 @@
-import { FeatureAttributes } from "./schemas";
-
 export interface TraineeIdentity {
   /**
    * The unique identifier of the Trainee.
@@ -13,11 +11,6 @@ export interface TraineeIdentity {
 }
 
 export interface Trainee extends TraineeIdentity {
-  /**
-   * Feature attributes of the Trainee.
-   */
-  features?: { [key: string]: FeatureAttributes };
-
   /**
    * The type of persistence schedule to use.
    * If allow, the trainee may be manually persisted and will be persisted automatically only when unloaded.