diff --git a/src/resources/extensions/gsd/auto-dispatch.ts b/src/resources/extensions/gsd/auto-dispatch.ts
index 6c738df9e..1a9313496 100644
--- a/src/resources/extensions/gsd/auto-dispatch.ts
+++ b/src/resources/extensions/gsd/auto-dispatch.ts
@@ -130,6 +130,32 @@ export function setRewriteCount(basePath: string, count: number): void {
   writeFileSync(filePath, JSON.stringify({ count, updatedAt: new Date().toISOString() }) + "\n");
 }
 
+// ─── Run-UAT dispatch counter (per-slice) ────────────────────────────────
+// Caps run-uat dispatches to prevent infinite replay when verification
+// commands fail before writing a verdict (#3624).
+const MAX_UAT_ATTEMPTS = 3;
+
+function uatCountPath(basePath: string, mid: string, sid: string): string {
+  return join(gsdRoot(basePath), "runtime", `uat-count-${mid}-${sid}.json`);
+}
+
+export function getUatCount(basePath: string, mid: string, sid: string): number {
+  try {
+    const data = JSON.parse(readFileSync(uatCountPath(basePath, mid, sid), "utf-8"));
+    return typeof data.count === "number" ? data.count : 0;
+  } catch {
+    return 0;
+  }
+}
+
+export function incrementUatCount(basePath: string, mid: string, sid: string): number {
+  const count = getUatCount(basePath, mid, sid) + 1;
+  const filePath = uatCountPath(basePath, mid, sid);
+  mkdirSync(join(gsdRoot(basePath), "runtime"), { recursive: true });
+  writeFileSync(filePath, JSON.stringify({ count, updatedAt: new Date().toISOString() }) + "\n");
+  return count;
+}
+
 // ─── Helpers ─────────────────────────────────────────────────────────────
 
 /**
@@ -203,6 +229,16 @@ export const DISPATCH_RULES: DispatchRule[] = [
       const needsRunUat = await checkNeedsRunUat(basePath, mid, state, prefs);
       if (!needsRunUat) return null;
       const { sliceId, uatType } = needsRunUat;
+
+      // Cap run-uat dispatch attempts to prevent infinite replay (#3624)
+      const attempts = incrementUatCount(basePath, mid, sliceId);
+      if (attempts > MAX_UAT_ATTEMPTS) {
+        return {
+          action: "stop" as const,
+          reason: `run-uat for ${mid}/${sliceId} has been dispatched ${attempts - 1} times without producing a verdict. Verification commands may be broken — fix the UAT spec or manually write an ASSESSMENT verdict.`,
+          level: "warning" as const,
+        };
+      }
       const uatFile = resolveSliceFile(basePath, mid, sliceId, "UAT")!;
       const uatContent = await loadFile(uatFile);
       return {
diff --git a/src/resources/extensions/gsd/tests/run-uat-replay-cap.test.ts b/src/resources/extensions/gsd/tests/run-uat-replay-cap.test.ts
new file mode 100644
index 000000000..0d4b80b65
--- /dev/null
+++ b/src/resources/extensions/gsd/tests/run-uat-replay-cap.test.ts
@@ -0,0 +1,51 @@
+/**
+ * Regression test for #3624 — cap run-uat dispatch attempts
+ *
+ * When verification commands fail before writing a verdict, the run-uat
+ * dispatch rule fires repeatedly in an infinite loop. The fix adds a
+ * MAX_UAT_ATTEMPTS constant and calls incrementUatCount before dispatch
+ * to cap the number of attempts.
+ *
+ * Structural verification test — reads source to confirm MAX_UAT_ATTEMPTS
+ * and incrementUatCount exist.
+ */
+
+import { describe, test } from 'node:test';
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const source = readFileSync(join(__dirname, '..', 'auto-dispatch.ts'), 'utf-8');
+
+describe('run-uat replay cap (#3624)', () => {
+  test('MAX_UAT_ATTEMPTS constant is defined', () => {
+    assert.match(source, /const MAX_UAT_ATTEMPTS\s*=\s*\d+/,
+      'MAX_UAT_ATTEMPTS constant should be defined');
+  });
+
+  test('incrementUatCount function is exported', () => {
+    assert.match(source, /export function incrementUatCount\(/,
+      'incrementUatCount should be an exported function');
+  });
+
+  test('getUatCount function is exported', () => {
+    assert.match(source, /export function getUatCount\(/,
+      'getUatCount should be an exported function');
+  });
+
+  test('incrementUatCount is called before dispatch in rule', () => {
+    // incrementUatCount should be called before the dispatch return
+    const ruleSection = source.slice(source.indexOf('checkNeedsRunUat'));
+    assert.match(ruleSection, /incrementUatCount\(/,
+      'incrementUatCount should be called in the dispatch rule');
+  });
+
+  test('attempts are compared against MAX_UAT_ATTEMPTS', () => {
+    assert.match(source, /attempts\s*>\s*MAX_UAT_ATTEMPTS/,
+      'dispatch should check attempts > MAX_UAT_ATTEMPTS');
+  });
+});