diff --git a/src/resources/extensions/sf/guided-flow-queue.ts b/src/resources/extensions/sf/guided-flow-queue.ts
index 0fb11531d..21d667e3a 100644
--- a/src/resources/extensions/sf/guided-flow-queue.ts
+++ b/src/resources/extensions/sf/guided-flow-queue.ts
@@ -17,7 +17,8 @@ import {
   sfRoot, resolveMilestoneFile, resolveSliceFile,
   resolveSfRootFile, relSfRootFile, relSliceFile,
 } from "./paths.js";
-import { readFileSync, writeFileSync, existsSync } from "node:fs";
+import { readFileSync, existsSync } from "node:fs";
+import { atomicWriteSync } from "./atomic-write.js";
 import { nativeAddPaths, nativeCommit } from "./native-git-bridge.js";
 import { loadEffectiveSFPreferences } from "./preferences.js";
 import { loadQueueOrder, sortByQueueOrder, saveQueueOrder } from "./queue-order.js";
@@ -387,7 +388,7 @@ function removeDependsOnFromContextFiles(
     const newContent = newFm.trim()
       ? `---\n${newFm}\n---${body}`
       : body.replace(/^\n+/, "");
-    writeFileSync(contextFile, newContent, "utf-8");
+    atomicWriteSync(contextFile, newContent, "utf-8");
   }
 }
 
@@ -435,5 +436,5 @@ function syncProjectMdSequence(
   const separatorLine = lines[tableStart + 1];
   const newTable = [headerLine, separatorLine, ...newRows];
   lines.splice(tableStart, tableEnd - tableStart, ...newTable);
-  writeFileSync(projectPath, lines.join("\n"), "utf-8");
+  atomicWriteSync(projectPath, lines.join("\n"), "utf-8");
 }
diff --git a/src/resources/extensions/sf/reports.ts b/src/resources/extensions/sf/reports.ts
index 3b97b8d47..f89032274 100644
--- a/src/resources/extensions/sf/reports.ts
+++ b/src/resources/extensions/sf/reports.ts
@@ -14,11 +14,12 @@
  * Manual: /sf export --html
  */
 
-import { writeFileSync, readFileSync, mkdirSync, existsSync } from 'node:fs';
+import { readFileSync, mkdirSync, existsSync } from 'node:fs';
 import { join, basename } from 'node:path';
 import { sfRoot } from './paths.js';
 import { formatCost, formatTokenCount } from './metrics.js';
 import { formatDateShort, formatDuration } from '../shared/format-utils.js';
+import { atomicWriteSync } from './atomic-write.js';
 
 // ─── Types ────────────────────────────────────────────────────────────────────
 
@@ -83,7 +84,7 @@ export function loadReportsIndex(basePath: string): ReportsIndex | null {
 function saveReportsIndex(basePath: string, index: ReportsIndex): void {
   const dir = reportsDir(basePath);
   mkdirSync(dir, { recursive: true });
-  writeFileSync(reportsIndexPath(basePath), JSON.stringify(index, null, 2) + '\n', 'utf-8');
+  atomicWriteSync(reportsIndexPath(basePath), JSON.stringify(index, null, 2) + '\n', 'utf-8');
 }
 
 // ─── Write a report snapshot ──────────────────────────────────────────────────
@@ -121,7 +122,7 @@ export function writeReportSnapshot(args: WriteReportSnapshotArgs): string {
   const filename = `${prefix}-${timestamp}.html`;
   const filePath = join(dir, filename);
 
-  writeFileSync(filePath, args.html, 'utf-8');
+  atomicWriteSync(filePath, args.html, 'utf-8');
 
   // Load or init registry
   const existing = loadReportsIndex(args.basePath);
@@ -170,7 +171,7 @@ export function writeReportSnapshot(args: WriteReportSnapshotArgs): string {
 
 export function regenerateHtmlIndex(basePath: string, index: ReportsIndex): void {
   const html = buildIndexHtml(index);
-  writeFileSync(reportsHtmlIndexPath(basePath), html, 'utf-8');
+  atomicWriteSync(reportsHtmlIndexPath(basePath), html, 'utf-8');
 }
 
 function buildIndexHtml(index: ReportsIndex): string {