diff --git a/src/resources/extensions/gsd/auto-post-unit.ts b/src/resources/extensions/gsd/auto-post-unit.ts
index 3bffee4b8..e0a10b4cd 100644
--- a/src/resources/extensions/gsd/auto-post-unit.ts
+++ b/src/resources/extensions/gsd/auto-post-unit.ts
@@ -39,7 +39,7 @@ import {
 } from "./auto-recovery.js";
 import { regenerateIfMissing } from "./workflow-projections.js";
 import { syncStateToProjectRoot } from "./auto-worktree.js";
-import { isDbAvailable, getTask, getSlice, getMilestone, updateTaskStatus, _getAdapter } from "./gsd-db.js";
+import { isDbAvailable, getTask, getSlice, getMilestone, updateTaskStatus, updateSliceStatus, _getAdapter } from "./gsd-db.js";
 import { renderPlanCheckboxes } from "./markdown-renderer.js";
 import { consumeSignal } from "./session-status-io.js";
 import {
@@ -161,7 +161,14 @@ export function detectRogueFileWrites(
 
     const dbRow = getSlice(mid, sid);
     if (!dbRow || dbRow.status !== "complete") {
-      rogues.push({ path: summaryPath, unitType, unitId });
+      // Auto-remediate: SUMMARY exists on disk but DB is stale — sync DB to
+      // match filesystem instead of reporting as rogue (#3633).
+      try {
+        updateSliceStatus(mid, sid, "complete", new Date().toISOString());
+      } catch {
+        // If DB update fails, fall back to rogue detection so the issue is visible
+        rogues.push({ path: summaryPath, unitType, unitId });
+      }
     }
   } else if (unitType === "plan-milestone") {
     if (!mid) return [];
diff --git a/src/resources/extensions/gsd/tests/auto-remediate-slice-status.test.ts b/src/resources/extensions/gsd/tests/auto-remediate-slice-status.test.ts
new file mode 100644
index 000000000..552096d00
--- /dev/null
+++ b/src/resources/extensions/gsd/tests/auto-remediate-slice-status.test.ts
@@ -0,0 +1,56 @@
+/**
+ * Regression test for #3673 — auto-remediate stale slice DB status
+ *
+ * When complete-slice fails after writing SUMMARY.md but before calling
+ * updateSliceStatus(), the DB stays stale and the post-unit check
+ * previously reported this as a "rogue" artifact, causing infinite
+ * re-dispatch. The fix calls updateSliceStatus() to sync the DB.
+ *
+ * This structural test verifies updateSliceStatus is imported and called
+ * in the complete-slice branch of auto-post-unit.ts.
+ */
+
+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-post-unit.ts'), 'utf-8');
+
+describe('auto-remediate stale slice status (#3673)', () => {
+  test('updateSliceStatus is imported from gsd-db', () => {
+    assert.match(source, /import\s*\{[^}]*updateSliceStatus[^}]*\}\s*from\s*["']\.\/gsd-db/,
+      'updateSliceStatus should be imported from gsd-db');
+  });
+
+  test('updateSliceStatus is called with "complete" status', () => {
+    assert.match(source, /updateSliceStatus\(mid,\s*sid,\s*["']complete["']/,
+      'updateSliceStatus should be called with "complete" status');
+  });
+
+  test('remediation is wrapped in try-catch for fallback to rogue detection', () => {
+    // The updateSliceStatus call should be in a try block with a catch
+    // that falls back to rogues.push
+    const updateIdx = source.indexOf('updateSliceStatus(mid, sid');
+    assert.ok(updateIdx > 0, 'updateSliceStatus call should exist');
+
+    // Find surrounding try-catch
+    const before = source.slice(Math.max(0, updateIdx - 200), updateIdx);
+    assert.match(before, /try\s*\{/,
+      'updateSliceStatus should be inside a try block');
+
+    const after = source.slice(updateIdx, updateIdx + 300);
+    assert.match(after, /catch/,
+      'try block should have a catch for fallback');
+  });
+
+  test('rogue detection still exists as fallback', () => {
+    // rogues.push should appear in the catch block
+    assert.match(source, /rogues\.push\(\{.*path:\s*summaryPath/,
+      'rogues.push fallback should still exist');
+  });
+});
diff --git a/src/resources/extensions/gsd/tests/rogue-file-detection.test.ts b/src/resources/extensions/gsd/tests/rogue-file-detection.test.ts
index e0fd6c00e..09110adf7 100644
--- a/src/resources/extensions/gsd/tests/rogue-file-detection.test.ts
+++ b/src/resources/extensions/gsd/tests/rogue-file-detection.test.ts
@@ -149,7 +149,7 @@ test("rogue detection: DB not available → returns empty array (graceful degrad
   }
 });
 
-test("rogue detection: slice summary on disk, no DB row → detected as rogue", () => {
+test("rogue detection: slice summary on disk, no DB row → auto-remediated (not rogue)", () => {
   const basePath = createTmpBase();
   const dbPath = join(basePath, ".gsd", "gsd.db");
   mkdirSync(join(basePath, ".gsd"), { recursive: true });
@@ -160,11 +160,10 @@ test("rogue detection: slice summary on disk, no DB row → detected as rogue",
     const summaryPath = createSliceSummaryOnDisk(basePath, "M001", "S01");
     assert.ok(existsSync(summaryPath), "Slice summary file should exist on disk");
 
+    // Fix #3633: stale slice DB status is auto-remediated via updateSliceStatus()
+    // instead of being reported as rogue, so rogues array should be empty.
     const rogues = detectRogueFileWrites("complete-slice", "M001/S01", basePath);
-    assert.equal(rogues.length, 1, "Should detect one rogue slice file");
-    assert.equal(rogues[0].path, summaryPath);
-    assert.equal(rogues[0].unitType, "complete-slice");
-    assert.equal(rogues[0].unitId, "M001/S01");
+    assert.equal(rogues.length, 0, "Should auto-remediate stale slice, not report as rogue");
   } finally {
     closeDatabase();
     rmSync(basePath, { recursive: true, force: true });