diff --git a/src/product/generation/master-workflow-renderer.ts b/src/product/generation/master-workflow-renderer.ts
index a889048..8b38e4e 100644
--- a/src/product/generation/master-workflow-renderer.ts
+++ b/src/product/generation/master-workflow-renderer.ts
@@ -27,6 +27,27 @@ interface RenderedMasterWorkflow {
   plan: MasterExecutionPlan;
 }
 
+// Workspace-aware typecheck: prefer the project's own `npm run typecheck`
+// script when one exists (the right thing for monorepos like
+// `npm run typecheck -ws` or custom build pipelines), and fall back to
+// `npx tsc --noEmit` when the project is a flat single-tsconfig repo.
+//
+// Without this guard, `npx tsc --noEmit` invoked from a monorepo root with
+// no top-level tsconfig.json (npm workspaces, packages/*/tsconfig.json
+// layout — common in MSD-style repos) finds neither input files nor a
+// config and dumps the full `tsc --help` text on stdout while exiting 1.
+// The auto-fix loop then "repairs" the workflow 7×, all failing identically
+// because the workflow command is correct in general — just wrong for this
+// repo shape.
+//
+// `npm pkg get scripts.typecheck` returns `"<command>"` when the script
+// exists and `{}` when it does not (npm v7.20.0+, shipped with Node 16+).
+// We compare against the literal `{}` so the snippet is portable across
+// any package layout. The substring `npx tsc --noEmit` is preserved so
+// downstream tools and human readers still recognize the intent.
+const TYPECHECK_COMMAND =
+  'if [ "$(npm pkg get scripts.typecheck 2>/dev/null)" != "{}" ]; then npm run typecheck; else npx tsc --noEmit; fi';
+
 const MASTER_EXPLICIT_PATTERN =
   /\b(master executor|master orchestration|smaller workflows|child workflows|several workflows|multiple workflows|break(?:ing)? (?:it )?(?:out|up)|divvy|decompos(?:e|ition)|workflow waves?)\b/i;
 
@@ -261,7 +282,7 @@ function renderMasterSource(input: {
     '      dependsOn: ["review-child-evidence"],',
     `      command: ${literal([
       'set -e',
-      'npx tsc --noEmit',
+      TYPECHECK_COMMAND,
       'npm test',
       'git diff --name-only',
       `grep -F RICKY_MASTER_REVIEW_READY ${shellQuote(`${input.artifactsDir}/review-codex.md`)}`,
@@ -462,9 +483,9 @@ function buildMasterGates(artifactsDir: string, plan: MasterExecutionPlan): Dete
     gate('skill-boundary-metadata-gate', `test -f ${artifactsDir}/skill-application-boundary.json`, 'file_exists', true, ['prepare-context'], 'pre_review'),
     gate('lead-plan-gate', `grep -F RICKY_MASTER_LEAD_PLAN_READY ${artifactsDir}/lead-plan.md`, 'output_contains', true, ['lead-plan'], 'pre_review'),
     gate('child-workflow-file-gate', plan.children.map((child) => `test -f ${child.workflowFilePath}`).join(' && '), 'file_exists', true, ['materialize-child-workflows'], 'pre_review'),
-    gate('initial-soft-validation', 'npx tsc --noEmit 2>&1 | tail -160', 'output_contains', false, ['child-workflow-file-gate'], 'pre_review'),
+    gate('initial-soft-validation', `{ ${TYPECHECK_COMMAND}; } 2>&1 | tail -160`, 'output_contains', false, ['child-workflow-file-gate'], 'pre_review'),
     gate('final-review-pass-gate', `grep -F RICKY_MASTER_REVIEW_READY ${artifactsDir}/review-codex.md`, 'output_contains', true, ['review-child-evidence'], 'final'),
-    gate('final-hard-validation', 'npx tsc --noEmit && npm test', 'exit_code', true, ['final-review-pass-gate'], 'final'),
+    gate('final-hard-validation', `{ ${TYPECHECK_COMMAND}; } && npm test`, 'exit_code', true, ['final-review-pass-gate'], 'final'),
     gate('git-diff-gate', 'git diff --name-only', 'output_contains', true, ['final-hard-validation'], 'final'),
     gate('regression-gate', 'npm test', 'exit_code', true, ['git-diff-gate'], 'regression'),
   ];
diff --git a/src/product/generation/pipeline.test.ts b/src/product/generation/pipeline.test.ts
index 2174248..fe278e4 100644
--- a/src/product/generation/pipeline.test.ts
+++ b/src/product/generation/pipeline.test.ts
@@ -58,6 +58,43 @@ describe('workflow generation pipeline', () => {
     expect(rendered.content).toContain('.run({ cwd: process.cwd() })');
   });
 
+  // Regression: master-rendered final-hard-validation used to hardcode
+  // `npx tsc --noEmit`, which dumps the full `tsc --help` text and exits 1
+  // when invoked from a monorepo root with no top-level tsconfig.json
+  // (npm workspaces with `packages/*/tsconfig.json` layout — common in
+  // MSD-style repos). The auto-fix loop then "repaired" the workflow 7×,
+  // all failing identically because the workflow command was correct in
+  // general — just wrong for that repo shape. The renderer now emits a
+  // workspace-aware shell snippet that prefers `npm run typecheck` when the
+  // project defines that script and falls back to `npx tsc --noEmit`
+  // otherwise. The fallback path keeps `npx tsc --noEmit` as a literal
+  // substring so downstream tests, evidence capture, and human readers
+  // still recognize the intent.
+  it('emits a workspace-aware typecheck command in master-rendered final-hard-validation', () => {
+    const result = generate({
+      spec: spec({
+        description:
+          'Implement nested runner, runtime policy, telemetry, evals, and insights as smaller workflows run by a master executor.',
+        constraints: ['Use independent child workflows with deterministic 80-to-100 validation.'],
+        acceptanceGates: ['npm test'],
+      }),
+      artifactPath: 'workflows/generated/runtime-master.ts',
+    });
+    expect(result.masterExecutionPlan).toBeDefined();
+    const rendered = artifact(result).content;
+
+    // The final-hard-validation step body must include both branches of the
+    // workspace-aware fallback so monorepos and flat repos both succeed.
+    expect(rendered).toContain('npm pkg get scripts.typecheck');
+    expect(rendered).toContain('npm run typecheck');
+    expect(rendered).toContain('npx tsc --noEmit');
+
+    // The bare `npx tsc --noEmit` (without the conditional guard) must not
+    // appear as the first command after `set -e` in any rendered .step body.
+    // That pattern is what would dump the tsc help text in monorepo roots.
+    expect(rendered).not.toMatch(/command: "set -e\\nnpx tsc --noEmit\\n/);
+  });
+
   it('uses a master workflow for broad target-file specs and leaves narrow specs on the existing renderer', () => {
     const broad = generate({
       spec: spec({