diff --git a/changelog.d/gsta208-ship-receipt-session-kind.md b/changelog.d/gsta208-ship-receipt-session-kind.md
index 2de4746d9..e8873cb0f 100644
--- a/changelog.d/gsta208-ship-receipt-session-kind.md
+++ b/changelog.d/gsta208-ship-receipt-session-kind.md
@@ -4,4 +4,4 @@
 - **`bin/gstack-ship-receipt`** starts `gstack-session-kind` with `runScriptSync`.
 
 ### Tests
-- `test/gstack-ship-receipt.test.ts`: a receipt written without a session kind takes it from `gstack-session-kind`.
+- `test/ship-receipt-session-kind.test.ts` (windows-free-tests too): a receipt written without a session kind records what `gstack-session-kind` prints.
diff --git a/scripts/lib/windows-curation.ts b/scripts/lib/windows-curation.ts
index 04e37cac3..d0ba7ee73 100644
--- a/scripts/lib/windows-curation.ts
+++ b/scripts/lib/windows-curation.ts
@@ -405,6 +405,7 @@ export const KNOWN_WINDOWS_SAFE: Array<{ file: string; reason: string }> = [
   { file: 'test/gstack-wtree-windows-paths.test.ts', reason: '#3101: runs bin/gstack-wtree through explicit bash in an os.tmpdir linked worktree with forward-slash paths; never executes a shebang; the drive-letter simulation is skipIf win32' },
   { file: 'test/setup-hook-syntax-gate.test.ts', reason: '#3088/#3100: runs bin/gstack-hook-check and the setup hook sections through explicit bash with forward-slash paths; never executes a shebang. Its Bun drive-path spelling is the Windows bug it guards' },
   { file: 'test/bun-config-shell-bins.test.ts', reason: '#3415: runs the record bins through lib/script-invocation.ts (Git Bash on Windows) with MSYS path conversion off, the case it guards; its bun and cygpath stand-ins and simulated-OSTYPE cases are skipIf win32' },
+  { file: 'test/ship-receipt-session-kind.test.ts', reason: '#3541: runs gstack-ship-receipt write through lib/script-invocation.ts, which must reach the bash gstack-session-kind through Git Bash; os.tmpdir git fixture only' },
   { file: 'test/path-spelling.test.ts', reason: 'sources bin/gstack-path-spelling.sh through explicit bash and checks lib/path-spelling.ts; on Windows it exercises the real Git Bash spellings' },
   { file: 'test/state-root-parity.test.ts', reason: 'runs the bash twin and lib/state-root.ts over an env table with PATH empty; no shebang execution, raw-string comparison is platform-neutral' },
   { file: 'test/generator-eexist.test.ts',
diff --git a/test/gstack-ship-receipt.test.ts b/test/gstack-ship-receipt.test.ts
index 9eddd5710..7e0eb68c8 100644
--- a/test/gstack-ship-receipt.test.ts
+++ b/test/gstack-ship-receipt.test.ts
@@ -72,21 +72,6 @@ describe('gstack-ship-receipt write', () => {
     expect(rewritten).toContain('## Summary');
   });
 
-  test('without --session-kind or GSTACK_SESSION_KIND, session_kind comes from gstack-session-kind (#3541)', () => {
-    const repo = fixture();
-    makePr(repo, 'pr-a', { expects: '1.2.4.0' });
-    expect(restamp(repo, ['--version', '1.2.4.0']).status).toBe(EXIT.ok);
-    repo.git('commit', '-qam', 'stamp');
-    const body = path.join(repo.root, 'body.md');
-    fs.writeFileSync(body, '## Summary\n\nProse.\n');
-    const env = { GSTACK_SESSION_KIND: '' };
-    const kind = runBin(repo, 'gstack-session-kind', [], env);
-    expect(kind.status, kind.err).toBe(0);
-    const w = runBin(repo, 'gstack-ship-receipt', ['write', '--pr', '44', '--base', 'main', '--body', body, '--json'], env);
-    expect(w.status, w.err).toBe(EXIT.ok);
-    expect(JSON.parse(w.out).session_kind).toBe(kind.out.trim());
-  });
-
   test('refuses an invalid receipt before writing (RECEIPT_INVALID) and a non-integer --pr', () => {
     const repo = fixture();
     const body = path.join(repo.root, 'body.md');
diff --git a/test/ship-receipt-session-kind.test.ts b/test/ship-receipt-session-kind.test.ts
new file mode 100644
index 000000000..48defdd94
--- /dev/null
+++ b/test/ship-receipt-session-kind.test.ts
@@ -0,0 +1,56 @@
+/**
+ * #3541 (the /ship half): `gstack-ship-receipt write` with no --session-kind
+ * and no GSTACK_SESSION_KIND asks bin/gstack-session-kind, a bash script.
+ * Spawned by path it never starts on Windows (no shebangs), so every receipt
+ * written there carried no session_kind.
+ *
+ * Windows-safe by construction: both bins launch through
+ * lib/script-invocation.ts (Git Bash on win32), state lives under os.tmpdir().
+ */
+import { afterEach, beforeEach, expect, test } from 'bun:test';
+import * as fs from 'node:fs';
+import * as os from 'node:os';
+import * as path from 'node:path';
+import { spawnSync } from 'node:child_process';
+import { runScriptSync } from '../lib/script-invocation';
+
+const ROOT = path.resolve(import.meta.dir, '..');
+
+let tmp = '', repo = '', env: NodeJS.ProcessEnv = {};
+
+beforeEach(() => {
+  tmp = fs.realpathSync(fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-receipt-kind-')));
+  repo = path.join(tmp, 'repo');
+  fs.mkdirSync(repo);
+  const gitconfig = path.join(tmp, 'gitconfig');
+  fs.writeFileSync(gitconfig, '');
+  env = {
+    ...process.env, HOME: tmp, USERPROFILE: tmp, GSTACK_STATE_ROOT: path.join(tmp, 'state'), GSTACK_HOME: path.join(tmp, 'state'), GSTACK_SESSION_KIND: '',
+    GIT_CONFIG_GLOBAL: gitconfig, GIT_CONFIG_NOSYSTEM: '1', GIT_DIR: undefined, GIT_WORK_TREE: undefined, GIT_INDEX_FILE: undefined,
+  };
+  const git = (...args: string[]) => {
+    const r = spawnSync('git', args, { cwd: repo, env, encoding: 'utf8', timeout: 30_000 });
+    expect(r.status, r.stderr).toBe(0);
+  };
+  git('init', '-q', '-b', 'main');
+  fs.writeFileSync(path.join(repo, 'a.txt'), 'a\n');
+  git('add', 'a.txt');
+  git('-c', 'user.email=fixture@example.test', '-c', 'user.name=Fixture', '-c', 'commit.gpgsign=false', 'commit', '-qm', 'fixture');
+  git('update-ref', 'refs/remotes/origin/main', 'HEAD');
+  git('switch', '-q', '-c', 'feat');
+});
+
+afterEach(() => fs.rmSync(tmp, { recursive: true, force: true }));
+
+test('write without a session kind records what gstack-session-kind prints (#3541)', () => {
+  const kind = runScriptSync(path.join(ROOT, 'bin', 'gstack-session-kind'), [], { cwd: repo, env, encoding: 'utf8', timeout: 30_000 });
+  expect(kind.status, kind.stderr).toBe(0);
+  const body = path.join(tmp, 'body.md');
+  fs.writeFileSync(body, '## Summary\n');
+  const w = runScriptSync(path.join(ROOT, 'bin', 'gstack-ship-receipt'), ['write', '--pr', '1', '--base', 'main', '--body', body, '--json'], {
+    cwd: repo, env, encoding: 'utf8', timeout: 120_000,
+  });
+  expect(w.error).toBeUndefined();
+  expect(w.status, w.stderr).toBe(0);
+  expect(JSON.parse(w.stdout).session_kind).toBe(kind.stdout.trim());
+}, 150_000);