diff --git a/packages/pstack/src/check.test.ts b/packages/pstack/src/check.test.ts
index 69ab7dec97a59..a4b77fff4a312 100644
--- a/packages/pstack/src/check.test.ts
+++ b/packages/pstack/src/check.test.ts
@@ -5,11 +5,12 @@ import * as NodePath from "node:path";
 import * as NodeURL from "node:url";
 import { describe, expect, it } from "vite-plus/test";
 import { checkPack } from "./check.ts";
-import { fileFingerprint, packFiles, type UpstreamManifest } from "./files.ts";
+import { fileFingerprint, packFiles, readManifest, type UpstreamManifest } from "./files.ts";
 import {
   parsePstackRoleDefaults,
   pstackContentHash,
   pstackPackEntries,
+  PSTACK_PACKAGED_PRUNED_DIR,
   PSTACK_SKILL_PREFIX,
   PSTACK_LAYOUT_VERSION,
 } from "./index.ts";
@@ -201,6 +202,28 @@ describe("pack interface", () => {
     expect(() => pstackPackEntries(pack.root)).not.toThrow();
   });
 
+  it("delivers a complete pack when packaging pruned the statechart test corpus", () => {
+    using pack = fixture();
+    pack.write("upstream/skills/statechart/scripts/statechart.ts", "export {};\n");
+    pack.write(`upstream/${PSTACK_PACKAGED_PRUNED_DIR}/corpus/Counter/chart.mmd`, "chart\n");
+    pack.seal();
+    expect(checkPack(pack.root)).toEqual([]);
+    NodeFS.rmSync(NodePath.join(pack.root, "upstream", PSTACK_PACKAGED_PRUNED_DIR), {
+      recursive: true,
+    });
+    const entries = pstackPackEntries(pack.root);
+    expect(entries.map(({ packPath }) => packPath)).toContain(
+      "skills/statechart/scripts/statechart.ts",
+    );
+    expect(entries.filter(({ sourcePath }) => !NodeFS.existsSync(sourcePath))).toEqual([]);
+  });
+
+  it("prunes a corpus the shipped snapshot actually carries", () => {
+    const pruned = (packPath: string) => packPath.startsWith(`${PSTACK_PACKAGED_PRUNED_DIR}/`);
+    expect(Object.keys(readManifest(packageDir).files).some(pruned)).toBe(true);
+    expect(pstackPackEntries(packageDir).some(({ packPath }) => pruned(packPath))).toBe(false);
+  });
+
   it("invalidates the delivery stamp from the adapter layout", () => {
     using pack = fixture();
     expect(pstackContentHash(pack.root)).not.toBe(pstackContentHash(pack.root, 2));
diff --git a/packages/pstack/src/index.ts b/packages/pstack/src/index.ts
index 2fa542c84258c..969570a50b795 100644
--- a/packages/pstack/src/index.ts
+++ b/packages/pstack/src/index.ts
@@ -8,7 +8,12 @@ export { parsePstackRoleDefaults, PSTACK_PANEL_ROLES, type PstackRoleDefault } f
 export const PSTACK_SKILL_PREFIX = "pstack:";
 export const PSTACK_LAYOUT_VERSION = 3;
 
-const isRuntimePackFile = (packPath: string) => NodePath.posix.basename(packPath) !== ".gitignore";
+/** Upstream test corpus that packaged desktop builds delete; the runtime pack never needs it. */
+export const PSTACK_PACKAGED_PRUNED_DIR = "skills/statechart/scripts/test";
+
+const isRuntimePackFile = (packPath: string) =>
+  NodePath.posix.basename(packPath) !== ".gitignore" &&
+  !packPath.startsWith(`${PSTACK_PACKAGED_PRUNED_DIR}/`);
 
 /** Files relative to a source root containing upstream/ and UPSTREAM.json. */
 export function pstackPackEntries(sourceRoot: string): ReadonlyArray<{
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 0ad25945372d1..f0d22816be2db 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -2428,6 +2428,9 @@ importers:
       '@t3tools/contracts':
         specifier: workspace:*
         version: link:../packages/contracts
+      '@t3tools/pstack':
+        specifier: workspace:*
+        version: link:../packages/pstack
       '@t3tools/shared':
         specifier: workspace:*
         version: link:../packages/shared
diff --git a/scripts/build-desktop-artifact.test.ts b/scripts/build-desktop-artifact.test.ts
index c653113088f7d..c17e129fca354 100644
--- a/scripts/build-desktop-artifact.test.ts
+++ b/scripts/build-desktop-artifact.test.ts
@@ -71,6 +71,7 @@ import {
   ReleasePackageManifestError,
   releasePackageFiles,
 } from "./update-release-package-versions.ts";
+import { pstackPackEntries } from "@t3tools/pstack";
 import * as HostProcess from "@t3tools/shared/HostProcess";
 import { symlinksSupported } from "@t3tools/shared/testing/symlinks";
 
@@ -1377,10 +1378,17 @@ it.layer(NodeServices.layer)("build-desktop-artifact", (it) => {
         path.join(import.meta.dirname, "../packages/pstack/upstream"),
         path.join(packagedPstackDir, "upstream"),
       );
+      yield* fs.copy(
+        path.join(import.meta.dirname, "../packages/pstack/UPSTREAM.json"),
+        path.join(packagedPstackDir, "UPSTREAM.json"),
+      );
       yield* prunePackagedPstackTestFixtures(packagedPstackDir);
       const scriptsDir = path.join(packagedPstackDir, "upstream/skills/statechart/scripts");
       assert.isFalse(yield* fs.exists(path.join(scriptsDir, "test")));
       assert.isTrue(yield* fs.exists(path.join(scriptsDir, "statechart.ts")));
+      for (const { sourcePath } of pstackPackEntries(packagedPstackDir)) {
+        assert.isTrue(yield* fs.exists(sourcePath), sourcePath);
+      }
       yield* stageSelfContainedPlatformPackages(
         path.join(import.meta.dirname, "../apps/server/node_modules"),
         path.join(fixture.packagedAppDir, "resources/node_modules"),
diff --git a/scripts/build-desktop-artifact.ts b/scripts/build-desktop-artifact.ts
index b1fc34f126fdb..fcb905dab3904 100644
--- a/scripts/build-desktop-artifact.ts
+++ b/scripts/build-desktop-artifact.ts
@@ -16,6 +16,7 @@ import {
   type DirectoryRecord,
 } from "@electron/asar";
 
+import { PSTACK_PACKAGED_PRUNED_DIR } from "@t3tools/pstack";
 import { fromYaml } from "@t3tools/shared/schemaYaml";
 import * as HostProcess from "@t3tools/shared/HostProcess";
 import { clerkFrontendApiHostnameFromPublishableKey } from "@t3tools/shared/relayAuth";
@@ -3106,7 +3107,7 @@ export const prunePackagedPstackTestFixtures = Effect.fn("prunePackagedPstackTes
   function* (pstackDir: string) {
     const fs = yield* FileSystem.FileSystem;
     const path = yield* Path.Path;
-    const fixtureDir = path.join(pstackDir, "upstream/skills/statechart/scripts/test");
+    const fixtureDir = path.join(pstackDir, "upstream", PSTACK_PACKAGED_PRUNED_DIR);
     yield* fs.remove(fixtureDir, { recursive: true, force: true });
   },
 );
diff --git a/scripts/package.json b/scripts/package.json
index d5f34a0756f33..fadf0ac9087e3 100644
--- a/scripts/package.json
+++ b/scripts/package.json
@@ -11,6 +11,7 @@
     "@electron/asar": "^4.3.0",
     "@electron/osx-sign": "2.7.0",
     "@t3tools/contracts": "workspace:*",
+    "@t3tools/pstack": "workspace:*",
     "@t3tools/shared": "workspace:*",
     "@t3tools/tailscale": "workspace:*",
     "agent-device": "0.21.32",