diff --git a/AGENTS.md b/AGENTS.md
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+++ b/AGENTS.md
@@ -2948,3 +2948,107 @@ cargo build -p markbase-core                              # ✅ 0 error (no feat
 ```
 
 **版本**：1.34（SMB Server Phase 2 Build Fix）
+
+---
+
+## SMB VFS 功能完成（2026-06-20）⭐⭐⭐⭐⭐
+
+**完成时间**：约 2 小时
+**新增代码量**：311 行 + 85 行（CLI）
+**Git commits**：`51ca0c4`, `d1467f0`, `3986fb2`
+
+### 实施内容 ⭐⭐⭐⭐⭐
+
+| 功能 | 状态 | 实现方式 |
+|------|------|---------|
+| `set_len()` | ✅ 完成 | SMB SET_INFO compound (FileEndOfFileInformation class 14) |
+| `set_stat()` | ✅ 完成 | SMB SET_INFO compound (FileBasicInformation class 4) for timestamps |
+| **Streaming write** | ✅ 完成 | `Tree::create_file_writer` + `FileWriter::write_chunk` / `finish` |
+| `auto_reconnect` | ✅ 完成 | `ClientConfig.auto_reconnect = true` (new_with_options param) |
+| **Multi-user CLI** | ✅ 完成 | `--user name:password` (repeatable) |
+| **S3 VFS backend** | ✅ 完成 | `--s3 --s3-endpoint --s3-bucket --s3-access-key --s3-secret-key` |
+| Streaming read | ❌ Deferred | `FileDownload<'a>` lifetime incompatible with `SmbVfsFile` |
+| SMB3 encryption | ❌ N/A | smb-server v1 limitation (AES-CCM/GCM out of scope) |
+
+### 关键实现 ⭐⭐⭐⭐⭐
+
+**set_len() compound**（smb_fs.rs）:
+```rust
+CREATE → SET_INFO (FileEndOfFileInformation, size as 8-byte LE) → CLOSE
+```
+
+**set_stat() compound**（smb_fs.rs）:
+```rust
+CREATE → SET_INFO (FileBasicInformation, 40-byte buffer: creation/access/write/change times + attributes) → CLOSE
+```
+
+**Streaming write**（smb_fs.rs）:
+```rust
+// On first write, create FileWriter
+let tree_arc = Arc::new(self.tree.clone());
+let conn = client.connection_mut().clone();
+let writer = tree_arc.create_file_writer(conn, &path)?;
+self.file_writer = Some(writer);
+
+// write() → write_chunk()
+writer.write_chunk(buf)?;
+
+// flush() → finish()
+writer.finish()?;
+```
+
+### CLI 使用示例 ⭐⭐⭐⭐⭐
+
+**本地文件系统**（默认）:
+```bash
+cargo run --features smb-server -- smb-start \
+  --port 4445 \
+  --share-name myshare \
+  --root /path/to/data \
+  --user alice:pass1 --user bob:pass2
+```
+
+**S3 VFS 后端**:
+```bash
+cargo run --features smb-server -- smb-start \
+  --s3 \
+  --s3-endpoint https://s3.amazonaws.com \
+  --s3-bucket mybucket \
+  --s3-access-key AKIAIOSFODNN7EXAMPLE \
+  --s3-secret-key wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY \
+  --s3-region us-east-1 \
+  --root demo/ \
+  --share-name s3share
+```
+
+### 测试验证 ✅
+
+```bash
+cargo build -p markbase-core --features smb-server  # ✅ 0 error
+cargo test -p markbase-core --lib --features smb-server  # ✅ 229 passed, 0 failed
+```
+
+### 相关文件
+
+**修改文件**:
+```
+markbase-core/src/vfs/smb_fs.rs (+311 lines)
+  ├── systemtime_to_filetime() helper
+  ├── SmbVfs::new_with_options(auto_reconnect param)
+  ├── SmbVfsFile::set_len() compound
+  ├── SmbVfsFile::set_stat() compound
+  ├── SmbVfsFile::file_writer: Option<FileWriter>
+  ├── SmbVfsFile::write() streaming
+  ├── SmbVfsFile::flush() FileWriter::finish()
+  └── SmbVfsFile::drop() cleanup
+
+markbase-core/src/cli/tools/smb_server.rs (+85 lines)
+  ├── --user name:password (repeatable)
+  ├── --s3 flag + endpoint/bucket/credentials params
+  └── S3Vfs backend integration
+```
+
+---
+
+**最后更新**：2026-06-20
+**版本**：1.35（SMB VFS 功能完成）