diff --git a/test/integration/whole-mesh-full.test.ts b/test/integration/whole-mesh-full.test.ts
index b2d666c..65d9379 100644
--- a/test/integration/whole-mesh-full.test.ts
+++ b/test/integration/whole-mesh-full.test.ts
@@ -66,7 +66,7 @@ import {
   bootstrapBinaryPath, hostBinaryPath, placeBootstrap, BOOTSTRAP_PATH, HOST_PATH,
 } from "../../src/lifecycle/place.ts";
 import { labIsUsable, destroyAll, substrateBundle, onTheMachine } from "./harness.ts";
-import type { HeldImage } from "../../src/pinning.ts";
+import { referenceFor, type HeldImage } from "../../src/pinning.ts";
 
 const capability = await labIsUsable();
 const binary = hostBinaryPath();
@@ -359,11 +359,29 @@ function bundleFor(images: HeldImage[]): string {
 function loadManifest(name: string): { manifest: string; broker: boolean } {
   const path = resolve(catalogDir, name, "module.json");
   const m = JSON.parse(readFileSync(path, "utf8")) as {
-    resources?: { type: string; image?: string; ports?: string[] }[];
+    resources?: { type: string; image?: string; artifact?: string; ports?: string[] }[];
   };
   const remap = REMAP[name] ?? {};
   for (const r of m.resources ?? []) {
     if (r.type !== "container") continue;
+    // **A container naming an artifact is a module the mesh builds, and this bed does not build.**
+    // It pre-builds the same images on the workstation and stocks them, which is the lab standing
+    // in for the builder — so it does here what the builder does: replace the artifact with the
+    // reference the machine actually holds. Without this the unresolved field travels to the
+    // machine, whose declaration language has no such field, and the whole declaration is refused.
+    //
+    // The repository is `mesh-runtime-<module>`, which is not a guess: it is what this repository's
+    // own `scripts/build-module-runtime.sh <module>` produces and what the scenarios stock by name.
+    if (typeof r.artifact === "string" && typeof r.image !== "string") {
+      const reference = referenceFor(held, `mesh-runtime-${name}`);
+      assert.ok(reference,
+        `${name} declares the "${r.artifact}" artifact and this scenario stocked no ` +
+        `mesh-runtime-${name}. The mesh would have to build it, and this bed does not build — ` +
+        `add it to the machine's images: in the scenario, or build it with ` +
+        `scripts/build-module-runtime.sh ${name}`);
+      r.image = reference;
+      delete r.artifact;
+    }
     if (typeof r.image === "string") r.image = pinned(r.image);
     if (Array.isArray(r.ports)) r.ports = r.ports.map((p) => remap[p] ?? p);
   }