diff --git a/packages/deploy-script-support/src/writeCoreProposal.js b/packages/deploy-script-support/src/writeCoreProposal.js
index 144ef6bebff..8a489f47384 100644
--- a/packages/deploy-script-support/src/writeCoreProposal.js
+++ b/packages/deploy-script-support/src/writeCoreProposal.js
@@ -91,6 +91,8 @@ export const makeWriteCoreProposal = (
       return ns.default;
     };
 
+    const bundles = [];
+
     /**
      * Install an entrypoint.
      *
@@ -103,9 +105,14 @@ export const makeWriteCoreProposal = (
       const bundle = getBundle(entrypoint, bundlePath);
 
       // Serialise the installations.
-      mutex = E.when(mutex, () => {
+      mutex = E.when(mutex, async () => {
         // console.log('installing', { filePrefix, entrypoint, bundlePath });
-        return getBundleSpec(bundle, getBundler, opts);
+        const spec = await getBundleSpec(bundle, getBundler, opts);
+        bundles.push({
+          entrypoint,
+          ...spec,
+        });
+        return spec;
       });
       // @ts-expect-error xxx mutex type narrowing
       return mutex;
@@ -162,6 +169,18 @@ const overrideManifest = ${stringify(overrideManifest, true)};
     log(`creating ${proposalJsFile}`);
     await writeFile(proposalJsFile, trimmed);
 
+    const plan = {
+      name: filePrefix,
+      script: proposalJsFile,
+      permit: proposalPermitJsonFile,
+      bundles,
+    };
+
+    await writeFile(
+      `${filePrefix}-plan.json`,
+      `${JSON.stringify(plan, null, 2)}\n`,
+    );
+
     log(`\
 You can now run a governance submission command like:
   agd tx gov submit-proposal swingset-core-eval ${proposalPermitJsonFile} ${proposalJsFile} \\
diff --git a/packages/internal/src/node/createBundles.js b/packages/internal/src/node/createBundles.js
index d17d1bb45ea..ecc7d505b73 100644
--- a/packages/internal/src/node/createBundles.js
+++ b/packages/internal/src/node/createBundles.js
@@ -23,7 +23,7 @@ export const createBundlesFromAbsolute = async sourceBundles => {
     }
     const bundle = match[1];
 
-    const args = cacheToArgs.get(cache) || ['--to', cache];
+    const args = cacheToArgs.get(cache) || ['--cache-js', cache];
     args.push(srcPath, bundle);
     cacheToArgs.set(cache, args);
   }