diff --git a/MIGRATION.md b/MIGRATION.md
index 80e9e2b..193af6b 100644
--- a/MIGRATION.md
+++ b/MIGRATION.md
@@ -6,13 +6,11 @@ This major change refactors the client and types for all Howso Engine operations
 
 ### Typing Changes
 
-- The `types/models` package has been renamed to `types/schemas`.
-- The `types/schemas` types are now autogenerated from the Engine API, and will have a different naming schema across
+- Most of all the types are now autogenerated from the Engine API, and will have a different naming schema across
   the board. However, most of the type's properties should remain the same.
 - `types/shims` have been added as a stop gap for types lost from this migration. These will be transitioned out as
   types improve in the Howso Engine API specification.
-- The `Trainee` type no longer has a `features` property. Instead use `getFeatureAttributes`
-- `Trainee` and `Session` types are exposed from the top level `types` package.
+- The `Trainee` type no longer has a `features` property. Instead use `getFeatureAttributes`.
 
 ### Client Changes
 
diff --git a/README.md b/README.md
index 4f8cf5c..b76ffd7 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,7 @@ This process can be CPU intensive, you are encouraged to use a web `Worker` if r
 #### Through a web Worker
 
 ```ts
+// @/workers/AmalgamWorker
 import { AmalgamWasmService, initRuntime } from "@howso/amalgam-lang";
 import wasmDataUri from "@howso/amalgam-lang/lib/amalgam-st.data?url";
 import wasmUri from "@howso/amalgam-lang/lib/amalgam-st.wasm?url";
@@ -86,7 +87,7 @@ const getClient = async (options?: ClientOptions): Promise<HowsoWorkerClient> =>
   const fs = new BrowserFileSystem(worker);
   const client = new HowsoWorkerClient(worker, fs, {
     howsoUrl,
-    migrationsUrl,
+    migrationsUrl, // Optional, used for upgrading Trainees saved to disk.
     ...options,
   });
   return client.setup();
diff --git a/codegen/README.md b/codegen/README.md
index e8e600a..ea769bf 100644
--- a/codegen/README.md
+++ b/codegen/README.md
@@ -10,7 +10,7 @@ Note that by running this utility, files will be added/updated/deleted in the
 `src` directory. Once generated, files should then be committed back to the
 repository.
 
-Ensure that the Howso Engine caml file located at `src/engine/howso.caml` is
+Ensure that the Howso Engine caml file located at `src/assets/howso.caml` is
 up to date before generation.
 
 ### Generating the code
diff --git a/codegen/engine.ts b/codegen/engine.ts
index 7a652a6..dea38af 100644
--- a/codegen/engine.ts
+++ b/codegen/engine.ts
@@ -26,7 +26,7 @@ export interface Schema extends BaseSchema {
   values?: SchemaType | Schema | Ref;
   indices?: Record<string, SchemaType | Schema | Ref>;
   dynamic_indices?: Record<string, SchemaType | Schema | Ref>;
-  additional_indices?: SchemaType | Schema | Ref;
+  additional_indices?: SchemaType | Schema | Ref | false;
 }
 
 export interface LabelDefinition {
@@ -49,7 +49,7 @@ export interface EngineApi {
 
 export async function getEngineApi(): Promise<EngineApi> {
   const handle = "default";
-  const enginePath = require.resolve("../../src/engine/howso.caml");
+  const enginePath = require.resolve("../../src/assets/howso.caml");
   const dataPath = require.resolve("@howso/amalgam-lang/lib/amalgam-st.data");
   const wasmPath = require.resolve("@howso/amalgam-lang/lib/amalgam-st.wasm");
 
@@ -101,6 +101,7 @@ export function isSchema(value: SchemaType | Schema | Ref | null | undefined): v
   return !isRef(value) && "type" in value && typeof value.type === "string";
 }
 
-export function isSchemaOrRef(value: SchemaType | Schema | Ref | null | undefined): value is Schema | Ref {
+export function isSchemaOrRef(value: SchemaType | Schema | Ref | boolean | null | undefined): value is Schema | Ref {
+  if (typeof value === "boolean") return false;
   return isRef(value) || isSchema(value);
 }
diff --git a/codegen/rollup.config.js b/codegen/rollup.config.js
index 9134832..297b5b4 100644
--- a/codegen/rollup.config.js
+++ b/codegen/rollup.config.js
@@ -15,7 +15,7 @@ export default {
     copy({
       targets: [
         {
-          src: ["src/engine/howso.caml"],
+          src: ["src/assets/howso.caml"],
           dest: "./codegen/build",
         },
         {
diff --git a/rollup.config.js b/rollup.config.js
index b10dcfe..d29bfcf 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -17,7 +17,7 @@ export default {
     copy({
       targets: [
         {
-          src: ["src/engine/howso.caml", "src/engine/migrations.caml"],
+          src: ["src/assets/howso.caml", "src/assets/migrations.caml"],
           dest: "lib",
         },
       ],
diff --git a/src/engine/howso.caml b/src/assets/howso.caml
similarity index 100%
rename from src/engine/howso.caml
rename to src/assets/howso.caml
diff --git a/src/engine/migrations.caml b/src/assets/migrations.caml
similarity index 100%
rename from src/engine/migrations.caml
rename to src/assets/migrations.caml
diff --git a/src/client/worker/HowsoWorkerClient.node.test.ts b/src/client/worker/HowsoWorkerClient.node.test.ts
index 5a1ff11..97dea9d 100644
--- a/src/client/worker/HowsoWorkerClient.node.test.ts
+++ b/src/client/worker/HowsoWorkerClient.node.test.ts
@@ -18,7 +18,7 @@ describe("Node HowsoWorkerClient", () => {
     const fs = new NodeFileSystem(worker);
     client = new HowsoWorkerClient(worker, fs, {
       trace: false,
-      howsoUrl: resolve(__dirname, "../../engine/howso.caml"),
+      howsoUrl: resolve(__dirname, "../../assets/howso.caml"),
     });
     await client.setup();
     const dataPath = resolve(__dirname, "../../tests/assets/iris.json");