diff --git a/just/npm.just b/just/npm.just
index cedceda..6f8b09c 100644
--- a/just/npm.just
+++ b/just/npm.just
@@ -37,7 +37,7 @@ npm-test-trap-sandbox:
     npm test --prefix tools/trap-sandbox/
 
 # Run Node-based tool integration tests.
-npm-test-integration: npm-test-integration-mcp-bridge npm-test-integration-trap-sandbox
+npm-test-integration: stage npm-test-integration-mcp-bridge npm-test-integration-trap-sandbox
 
 npm-test-integration-mcp-bridge:
     npm run test:integration --prefix tools/mcp-bridge
diff --git a/tools/mcp-bridge/test-integration/harness.ts b/tools/mcp-bridge/test-integration/harness.ts
index d4ed622..e3e906d 100644
--- a/tools/mcp-bridge/test-integration/harness.ts
+++ b/tools/mcp-bridge/test-integration/harness.ts
@@ -1,4 +1,5 @@
 import { spawn } from "node:child_process";
+import { existsSync } from "node:fs";
 import { mkdtemp, rm } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { dirname, join } from "node:path";
@@ -142,10 +143,15 @@ export function startCraftos(
         args.push("--id", String(opts.computerId));
       }
       if (opts.mountRepo) {
+        if (!existsSync(join(REPO_ROOT, ".stage/apis"))) {
+          throw new Error(
+            ".stage/ is missing — run `just stage` (or use `just test-integration`) before the integration tests.",
+          );
+        }
         args.push(
           "--mount-ro", `/trapos=${REPO_ROOT}`,
-          "--mount-ro", `/apis=${join(REPO_ROOT, "apis")}`,
-          "--mount-ro", `/programs=${join(REPO_ROOT, "programs")}`,
+          "--mount-ro", `/apis=${join(REPO_ROOT, ".stage/apis")}`,
+          "--mount-ro", `/programs=${join(REPO_ROOT, ".stage/programs")}`,
         );
       }
       if (process.platform === "darwin") {
diff --git a/tools/trap-sandbox/test-integration/harness.ts b/tools/trap-sandbox/test-integration/harness.ts
index 6da11d0..fc7ec7f 100644
--- a/tools/trap-sandbox/test-integration/harness.ts
+++ b/tools/trap-sandbox/test-integration/harness.ts
@@ -1,5 +1,6 @@
 import { spawn } from "node:child_process";
 import { createServer } from "node:http";
+import { existsSync } from "node:fs";
 import { mkdtemp, rm } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { dirname, join } from "node:path";
@@ -148,14 +149,19 @@ export function startCraftos(
     const dataDir = await mkdtemp(join(tmpdir(), "trap-sandbox-it-"));
     const watchdog = setTimeout(() => controller.abort(), timeoutMs);
     try {
+      if (!existsSync(join(REPO_ROOT, ".stage/apis"))) {
+        throw new Error(
+          ".stage/ is missing — run `just stage` (or use `just test-integration`) before the integration tests.",
+        );
+      }
       const args: string[] = [
         "--directory", dataDir,
         "--headless",
         "--mount-ro", `/staging=${LUA_DIR}`,
         "--mount-ro", `/trapos=${REPO_ROOT}`,
-        "--mount-ro", `/apis=${join(REPO_ROOT, "apis")}`,
-        "--mount-ro", `/servers=${join(REPO_ROOT, "servers")}`,
-        "--mount-ro", `/programs=${join(REPO_ROOT, "programs")}`,
+        "--mount-ro", `/apis=${join(REPO_ROOT, ".stage/apis")}`,
+        "--mount-ro", `/servers=${join(REPO_ROOT, ".stage/servers")}`,
+        "--mount-ro", `/programs=${join(REPO_ROOT, ".stage/programs")}`,
       ];
       if (opts.computerId !== undefined) {
         args.push("--id", String(opts.computerId));