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# WorkspaceFilesystem

**Added in:** `@mastra/core@1.1.0`

The `WorkspaceFilesystem` interface defines how workspaces interact with file storage.

## Methods

### `readFile(path, options?)`

Read file contents.

```typescript
const content = await filesystem.readFile('/docs/guide.md')
const buffer = await filesystem.readFile('/image.png', { encoding: 'binary' })
```

**Parameters:**

**path** (`string`): File path relative to basePath

**options** (`Options`): readFile options.

**options.encoding** (`'utf-8' | 'binary'`): Text or binary encoding

**Returns:** `Promise<string | Buffer>`

### `writeFile(path, content, options?)`

Write file contents.

```typescript
await filesystem.writeFile('/docs/new.md', '# New Document')
await filesystem.writeFile('/nested/path/file.md', content, { recursive: true })
```

**Parameters:**

**path** (`string`): File path relative to basePath

**content** (`string | Buffer`): File content

**options** (`Options`): Configuration options.

**options.recursive** (`boolean`): Create parent directories if they don't exist

**options.overwrite** (`boolean`): Overwrite existing file

**options.expectedMtime** (`Date`): If provided, the write fails with a StaleFileError when the file's current modification time doesn't match. Use this for optimistic concurrency control to detect external modifications between read and write.

### `deleteFile(path, options?)`

Delete a file.

```typescript
await filesystem.deleteFile('/docs/old.md')
await filesystem.deleteFile('/docs/maybe.md', { force: true }) // Don't throw if missing
```

**Parameters:**

**path** (`string`): File path

**options** (`Options`): Configuration options.

**options.force** (`boolean`): Don't throw error if file doesn't exist

### `appendFile(path, content)`

Append content to a file, creating it if it doesn't already exist. Parent directories are created automatically.

```typescript
await filesystem.appendFile('/logs/app.log', 'New log entry\n')
```

**Parameters:**

**path** (`string`): File path

**content** (`string | Buffer`): Content to append

### `copyFile(src, dest, options?)`

Copy a file to a new location.

```typescript
await filesystem.copyFile('/docs/template.md', '/docs/new-doc.md')
```

**Parameters:**

**src** (`string`): Source file path

**dest** (`string`): Destination file path

**options** (`Options`): Configuration options.

**options.overwrite** (`boolean`): Overwrite destination if it exists

### `moveFile(src, dest, options?)`

Move or rename a file.

```typescript
await filesystem.moveFile('/docs/draft.md', '/docs/final.md')
```

**Parameters:**

**src** (`string`): Source file path

**dest** (`string`): Destination file path

**options** (`Options`): Configuration options.

**options.overwrite** (`boolean`): Overwrite destination if it exists

### `readdir(path, options?)`

List directory contents.

```typescript
const entries = await filesystem.readdir('/docs')
// [{ name: 'guide.md', type: 'file' }, { name: 'api', type: 'directory' }]
```

**Returns:** `Promise<FileEntry[]>`

```typescript
interface FileEntry {
  name: string
  type: 'file' | 'directory'
  size?: number
  isSymlink?: boolean
  symlinkTarget?: string
}
```

### `mkdir(path, options?)`

Create a directory.

```typescript
await filesystem.mkdir('/docs/api')
await filesystem.mkdir('/deeply/nested/path', { recursive: true })
```

**Parameters:**

**path** (`string`): Directory path

**options** (`Options`): Configuration options.

**options.recursive** (`boolean`): Create parent directories

### `rmdir(path, options?)`

Remove a directory.

```typescript
await filesystem.rmdir('/docs/old')
await filesystem.rmdir('/docs/nested', { recursive: true })
```

**Parameters:**

**path** (`string`): Directory path

**options** (`Options`): Configuration options.

**options.recursive** (`boolean`): Remove contents recursively

**options.force** (`boolean`): Don't throw if directory doesn't exist

### `exists(path)`

Check if a path exists.

```typescript
const exists = await filesystem.exists('/docs/guide.md')
```

**Returns:** `Promise<boolean>`

### `stat(path)`

Get file or directory metadata.

```typescript
const stat = await filesystem.stat('/docs/guide.md')
// { name: 'guide.md', path: '/docs/guide.md', type: 'file', size: 1234, createdAt: Date, modifiedAt: Date }
```

**Returns:** `Promise<FileStat>`

```typescript
interface FileStat {
  name: string // File or directory name (basename only)
  path: string // Path relative to the filesystem basePath
  type: 'file' | 'directory'
  size: number
  createdAt: Date
  modifiedAt: Date
  mimeType?: string
}
```

## Optional methods

### `init()`

Initialize the filesystem. Called by `workspace.init()`.

```typescript
await filesystem.init?.()
```

### `destroy()`

Clean up resources. Called by `workspace.destroy()`.

```typescript
await filesystem.destroy?.()
```

### `getInfo()`

Get filesystem metadata.

```typescript
const info = await filesystem.getInfo?.()
// { id, name, provider, basePath, readOnly, status, storage? }
```

**Returns:** `Promise<FilesystemInfo>`

```typescript
interface FilesystemInfo {
  id: string
  name: string
  provider: string
  basePath?: string
  readOnly?: boolean
  status?: string
  storage?: {
    totalBytes?: number
    usedBytes?: number
    availableBytes?: number
  }
}
```

### `getInstructions(opts?)`

Returns a description of how this filesystem works. Injected into the agent's system message when the workspace is assigned to an agent.

```typescript
const instructions = filesystem.getInstructions?.()
// 'Local filesystem at "/workspace". Files at workspace path "/foo" are stored at "/workspace/foo" on disk.'
```

**Parameters:**

**opts.requestContext** (`RequestContext`): Forwarded to the instructions function if one was provided in the constructor.

**Returns:** `string`

### `walk(path, options?)`

Native recursive tree walk executed by the provider in as few calls as possible. When implemented, the workspace `list_files` tool uses it instead of issuing one `readdir` round trip per directory, which matters for remote providers (sandboxes, object stores). If `walk` throws, tools fall back to the `readdir`-based walk automatically and log a warning through the workspace logger, since the fallback issues one round trip per directory.

```typescript
const entries = await filesystem.walk?.('.', { maxDepth: 3 })
// [{ name: 'index.ts', type: 'file', path: 'src/index.ts' }, ...]
```

**Parameters:**

**path** (`string`): Directory to walk.

**options.maxDepth** (`number`): Maximum directory depth to descend (root entries are depth 1).

**options.includeHidden** (`boolean`): Include entries whose names start with ".". Defaults to false.

**Returns:** `Promise<WalkEntry[]>`

```typescript
interface WalkEntry extends FileEntry {
  path: string // Relative to the walk root, POSIX separators, no leading "./"
}
```

### `grep(options)`

Native content search executed by the provider (for example with `rg` or `grep` inside a sandbox). When implemented, the workspace `grep` tool delegates to it instead of downloading every file to search host-side. Throw `UnsupportedGrepPatternError` when a pattern can't run natively so that callers catch it and fall back to the host-side implementation. That fallback is logged at `info` level; any other error from `grep` also triggers the fallback but is logged as a warning, since the host-side search reads every candidate file.

```typescript
const results = await filesystem.grep?.({
  pattern: 'TODO',
  path: '.',
  caseSensitive: true,
  includeHidden: false,
})
// [{ path: 'src/index.ts', matches: [{ line: 3, column: 6, text: '// TODO: fix' }] }]
```

**Parameters:**

**options.pattern** (`string`): JavaScript regex source to search for.

**options.path** (`string`): File or directory root to search within.

**options.caseSensitive** (`boolean`): Whether matching is case-sensitive.

**options.includeHidden** (`boolean`): Include hidden files and directories in the search.

**options.maxCountPerFile** (`number`): Maximum matches per file (like grep -m).

**options.maxTotalMatches** (`number`): Global cap on total matches across all files.

**options.contextLines** (`number`): Lines of context to include before and after each match.

**Returns:** `Promise<FilesystemGrepResult[]>`

```typescript
interface FilesystemGrepResult {
  path: string // Relative to the search root, POSIX separators
  matches: FilesystemGrepMatch[]
}

interface FilesystemGrepMatch {
  line: number // 1-based line number
  column: number // 0-based UTF-16 (JS string) index, not a byte offset
  text: string // Full matched line, without trailing newline
  before?: string[] // Context lines before the match
  after?: string[] // Context lines after the match
}
```

## Related

- [Workspace Class](https://mastra.ai/reference/workspace/workspace-class)
- [Sandbox Interface](https://mastra.ai/reference/workspace/sandbox)