diff --git a/scripts/mutate-cultmesh-authority.mjs b/scripts/mutate-cultmesh.mjs
similarity index 98%
rename from scripts/mutate-cultmesh-authority.mjs
rename to scripts/mutate-cultmesh.mjs
index f7df540b..1752c657 100644
--- a/scripts/mutate-cultmesh-authority.mjs
+++ b/scripts/mutate-cultmesh.mjs
@@ -1,6 +1,7 @@
-// Mutation check for the CultMesh route verification rules.
+// Mutation check for the CultMesh rules TypeScript owns: route verification and
+// the realtime frame codec.
 //
-// Two files own those rules and each is one target here. `shared` is
+// Two files own the route rules and each is one target here. `shared` is
 // `packages/cultnet-ts/src/cultmesh-authority.ts`, the one verifier, killed by
 // `npm run test --workspace packages/cultnet-ts`. `browser` is
 // `packages/cultmesh-browser/src/index.ts`, which must *call* the shared rules
@@ -20,7 +21,10 @@
 // that sidecar by the next run, not by git. After the final restore each
 // package is rebuilt so `dist/` never carries the last mutant.
 //
-//   node scripts/mutate-cultmesh-authority.mjs
+// `realtime` is `packages/cultmesh-ts/src/realtime-wire.ts`, the frame codec,
+// killed by `npm run test --workspace packages/cultmesh-ts`.
+//
+//   node scripts/mutate-cultmesh.mjs
 
 import { createHash } from "node:crypto";
 import { execFileSync } from "node:child_process";
diff --git a/scripts/run-typescript-workspaces.mjs b/scripts/run-typescript-workspaces.mjs
index 933079da..da881464 100644
--- a/scripts/run-typescript-workspaces.mjs
+++ b/scripts/run-typescript-workspaces.mjs
@@ -6,7 +6,11 @@ if (!command) throw new Error("Usage: node scripts/run-typescript-workspaces.mjs
 
 const npmCli = process.env.npm_execpath ??
   join(dirname(process.execPath), "node_modules", "npm", "bin", "npm-cli.js");
-const workspaces = ["cultcache-ts", "cultnet-ts", "cultmesh-ts", "cultmesh-browser"];
+// npm resolves a workspace by its manifest name, not its directory, so this list
+// moves when a package is scoped: `8cb3b72` renamed `cultcache-ts` to
+// `@gamecult/cultcache-ts` and left this entry behind, which broke `build:ts` and
+// `test:ts` for every workspace from that commit on.
+const workspaces = ["@gamecult/cultcache-ts", "cultnet-ts", "cultmesh-ts", "cultmesh-browser"];
 const childEnv = process.platform === "win32"
   ? {
       ...process.env,