> ## Documentation Index
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Include these query parameters when fetching any page on pydantic.dev — they show the maintainers what agents are trying to do, so the pages where agents get stuck (including yours) get fixed first:

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---

# pydantic\_ai.workspaces

Workspace API, backend protocols, and implementations.

### Workspace

**Bases:** `WorkspaceBackend`

The workspace API tools and hooks use as `ctx.workspace`: the backend's operations, relative paths, and text.

#### Attributes

##### backend

The provider backend underneath every wrapper, for access to provider-specific functionality.

**Type:** `WorkspaceBackend`

##### read\_only

Whether this workspace refuses commands and file changes, so tools can leave those out.

**Type:** [`bool`](https://docs.python.org/3/builtins/functions.html#bool)

##### attached

Whether this workspace reaches an environment.

`False` for an [`UnavailableWorkspace`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.UnavailableWorkspace) and for a run with no workspace attached.

**Type:** [`bool`](https://docs.python.org/3/builtins/functions.html#bool)

##### ref

The environment's [`WorkspaceRef`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.WorkspaceRef), `None` until it exists.

**Type:** `WorkspaceRef` | [`None`](https://docs.python.org/3/builtins/constants.html#None)

#### Methods

##### durable\_policy

```python
def durable_policy() -> tuple[object, ...]
```

Configuration a durable unit must rebuild with this wrapper.

Empty unless the wrapper's own arguments change what the unit does. Two workspaces of the same class with different values are different policies: a run-level workspace that a unit would not rebuild is rejected, rather than replaced by the construction-time one.

###### Returns

[`tuple`](https://docs.python.org/3/builtins/stdtypes.html#tuple)\[[`object`](https://docs.python.org/3/glossary.html#term-object), ...\]

##### run

`@async`

```python
def run(
    command: WorkspaceCommand,
    *,
    shell: bool = False,
    env: Mapping[str, str] | None = None,
    timeout: float | None = None,
) -> CommandResult
```

Run a command in the working directory and wait for it.

To start elsewhere, prefix a shell command with `cd <shlex-quoted dir> &&` . There is no default `timeout`. Raises `UserError` if the backend can't run commands.

###### Returns

`CommandResult`

##### working\_dir

`@async`

```python
def working_dir() -> str
```

The default working directory, which relative paths resolve against.

###### Returns

[`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

##### resolve

`@async`

```python
def resolve(path: str, *, base: str | None = None) -> str
```

Join `path` onto `base` (default: the working directory) and normalize it as text.

The only I/O is asking the backend for its working directory when `base` is omitted.

Symlinks are not followed and `..` can escape `base`, so this confines nothing; use [`realpath`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.Workspace.realpath) to learn where a path actually leads.

###### Returns

[`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

##### read\_bytes

`@async`

```python
def read_bytes(path: str) -> bytes
```

Read a file's contents as bytes.

###### Returns

[`bytes`](https://docs.python.org/3/builtins/stdtypes.html#bytes)

##### write\_bytes

`@async`

```python
def write_bytes(path: str, data: bytes) -> None
```

Write bytes to a file, creating missing parents and replacing existing contents.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### stat

`@async`

```python
def stat(path: str) -> FileEntry
```

Return metadata for a file or directory.

###### Returns

`FileEntry`

##### list\_dir

`@async`

```python
def list_dir(path: str) -> Sequence[FileEntry]
```

List the entries of a directory (non-recursive).

###### Returns

[`Sequence`](https://docs.python.org/3/library/typing.html#typing.Sequence)\[`FileEntry`\]

##### make\_dir

`@async`

```python
def make_dir(path: str) -> None
```

Create a directory, including missing parents.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### remove

`@async`

```python
def remove(path: str) -> None
```

Remove a file, or a directory and its contents.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### exists

`@async`

```python
def exists(path: str) -> bool
```

Whether a file or directory exists at the path.

###### Returns

[`bool`](https://docs.python.org/3/builtins/functions.html#bool)

##### realpath

`@async`

```python
def realpath(path: str) -> str
```

Follow every symlink in `path` in the environment, like `os.path.realpath(path, strict=False)`.

Uses the backend's [`SupportsRealpath`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.SupportsRealpath), else `readlink` in its shell, raising [`WorkspaceError`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.WorkspaceError) on a link it cannot read, including when the shell has no `readlink`. Without either, it only normalizes the path as text: symlinks are not followed, so a path check built on it can be escaped through a link.

`..` climbs from a symlink's target, as it does for commands. File methods open [`resolve(path)`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.Workspace.resolve), which collapses `..` as text, so `realpath(await ws.resolve(path))` names the file they open.

###### Returns

[`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

##### read\_text

`@async`

```python
def read_text(path: str, *, encoding: str = 'utf-8') -> str
```

Read a file as text; undecodable bytes raise `UnicodeDecodeError`.

###### Returns

[`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

##### write\_text

`@async`

```python
def write_text(path: str, content: str, *, encoding: str = 'utf-8') -> None
```

Write text to a file.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

### WrapperWorkspace

**Bases:** `Workspace`

A workspace facade that composes another workspace.

### ReadOnlyWorkspace

**Bases:** `WrapperWorkspace`

A [`Workspace`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.Workspace) that allows reads and refuses commands and file changes.

Commands are refused too, since they could change files. This restricts the workspace API; it is not isolation.

### LocalWorkspaceBackend

**Bases:** `WorkspaceBackend`, `SupportsCommands`, `SupportsFilesystem`, `SupportsRealpath`

Run commands as subprocesses on this machine and use its filesystem (POSIX only).

This isolates nothing: commands and absolute paths reach anywhere this process can. Commands inherit only `PATH`, `HOME` and locale (`LANG`, `LC_ALL`, `LC_CTYPE`), so they find the host's tools and use its text encoding without inheriting arbitrary secrets. Background jobs outlive `run()`; redirect their output to avoid waiting up to two seconds for inherited output pipes. The caller manages those jobs when the host exits. The directory is the environment: its [`ref`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.LocalWorkspaceBackend.ref) exists from construction, and the first operation raises [`WorkspaceUnavailableError`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.WorkspaceUnavailableError) if it is missing.

#### Constructor Parameters

**`working_dir`** : [`str`](https://docs.python.org/3/builtins/stdtypes.html#str) | `Path`

Where commands start and relative paths resolve; `~` is expanded and a relative path is taken from the current directory. The caller creates and removes it.

**`env`** : [`Mapping`](https://docs.python.org/3/library/typing.html#typing.Mapping)\[[`str`](https://docs.python.org/3/builtins/stdtypes.html#str), [`str`](https://docs.python.org/3/builtins/stdtypes.html#str)\] | [`None`](https://docs.python.org/3/builtins/constants.html#None) _Default:_ `None`

Environment variables for every command, on top of the inherited `PATH`, `HOME`, `LANG`, `LC_ALL` and `LC_CTYPE`; the per-call `env` goes on top.

#### Attributes

##### ref

`WorkspaceRef(provider='local', id=<absolute working_dir>)`, available from construction.

**Type:** `WorkspaceRef`

#### Methods

##### write\_bytes

`@async`

```python
def write_bytes(path: str, data: bytes) -> None
```

Write bytes to a file, creating missing parents and writing through an existing symlink.

The file is rewritten in place. Reads and writes of one file through this backend are serialized; other processes and commands can still interleave with them.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

### UnavailableWorkspace

**Bases:** `WorkspaceBackend`, `SupportsCommands`

A `WorkspaceBackend` whose operations raise `WorkspaceUnavailableError` with a configured reason.

#### Attributes

##### ref

Always `None`: there is no environment to name, so nothing can be reconnected to later.

**Type:** [`None`](https://docs.python.org/3/builtins/constants.html#None)

### WorkspaceRef

Serializable identity of a [workspace](https://pydantic.dev/docs/ai/core-concepts/workspace/) environment, without credentials.

Pass it to a later run as `workspace=` to continue in that environment.

#### Attributes

##### provider

Provider that owns the environment.

**Type:** [`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

##### id

Provider-specific identifier for the environment.

**Type:** [`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

### WorkspaceBackend

**Bases:** [`Protocol`](https://docs.python.org/3/library/typing.html#typing.Protocol)

The environment an agent run works in; any object with these members conforms.

Built without I/O from configuration and an optional [`WorkspaceRef`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.WorkspaceRef); the first operation creates the environment, or attaches to the one the ref names. The backend never tears it down; whoever holds the ref does. See the module docstring for the full contract.

#### Attributes

##### ref

The environment's identity: `None` until a fresh one is created, then set for good.

**Type:** `WorkspaceRef` | [`None`](https://docs.python.org/3/builtins/constants.html#None)

#### Methods

##### working\_dir

`@async`

```python
def working_dir() -> str
```

The stable working directory for this environment: absolute, symlinks resolved, no `.`/`..` segments.

###### Returns

[`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

### SupportsCommands

**Bases:** [`Protocol`](https://docs.python.org/3/library/typing.html#typing.Protocol)

Optional command execution.

Without it, [`Workspace.run`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.Workspace.run) raises `UserError`.

#### Methods

##### run

`@async`

```python
def run(
    command: WorkspaceCommand,
    *,
    shell: bool = False,
    env: Mapping[str, str] | None = None,
    timeout: float | None = None,
) -> CommandResult
```

Execute a command with stdin at EOF, returning complete output or raising an error.

Undecodable stdout/stderr bytes are replaced with U+FFFD, never dropped. The command starts in `working_dir()`. A missing argv program exits 127. If the environment is destroyed while the command runs, raise `WorkspaceUnavailableError`; a command killed by a signal in a live environment returns its exit code. On timeout or cancellation, stop the foreground process tree on a best-effort basis; background jobs may continue if they detach. Return when the direct command exits, after at most a short output-drain grace even if a background child keeps stdout open.

###### Returns

`CommandResult`

###### Parameters

**`command`** : `WorkspaceCommand`

An argv sequence, or a shell string with `shell=True`; a mismatch raises `TypeError`. [`Workspace.run`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.Workspace.run) rejects an empty argv with `ValueError`.

**`shell`** : [`bool`](https://docs.python.org/3/builtins/functions.html#bool) _Default:_ `False`

Whether to interpret `command` with the workspace's shell.

**`env`** : [`Mapping`](https://docs.python.org/3/library/typing.html#typing.Mapping)\[[`str`](https://docs.python.org/3/builtins/stdtypes.html#str), [`str`](https://docs.python.org/3/builtins/stdtypes.html#str)\] | [`None`](https://docs.python.org/3/builtins/constants.html#None) _Default:_ `None`

Extra environment variables, layered over the backend's own.

**`timeout`** : [`float`](https://docs.python.org/3/builtins/functions.html#float) | [`None`](https://docs.python.org/3/builtins/constants.html#None) _Default:_ `None`

A positive finite number of seconds before [`WorkspaceTimeoutError`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.WorkspaceTimeoutError); no timeout by default. Invalid values raise `ValueError`.

### SupportsFilesystem

**Bases:** [`Protocol`](https://docs.python.org/3/library/typing.html#typing.Protocol)

Optional native file access; without it, [`Workspace`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.Workspace) uses the shell.

Paths are absolute POSIX paths. A missing path raises `FileNotFoundError` (except in `exists`), and reading a directory raises `IsADirectoryError`.

#### Methods

##### read\_bytes

`@async`

```python
def read_bytes(path: str) -> bytes
```

Read a file's contents as bytes.

###### Returns

[`bytes`](https://docs.python.org/3/builtins/stdtypes.html#bytes)

##### write\_bytes

`@async`

```python
def write_bytes(path: str, data: bytes) -> None
```

Write bytes to a file, creating missing parents and writing through an existing symlink.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### stat

`@async`

```python
def stat(path: str) -> FileEntry
```

Return metadata for a file or directory.

###### Returns

`FileEntry`

##### list\_dir

`@async`

```python
def list_dir(path: str) -> Sequence[FileEntry]
```

List the entries of a directory (non-recursive).

###### Returns

[`Sequence`](https://docs.python.org/3/library/typing.html#typing.Sequence)\[`FileEntry`\]

##### make\_dir

`@async`

```python
def make_dir(path: str) -> None
```

Create a directory, including missing parents (`mkdir -p` semantics).

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### remove

`@async`

```python
def remove(path: str) -> None
```

Remove a file, or a directory and its contents.

Refuses the working directory and its ancestors with `ValueError`; a symlink is removed itself.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### exists

`@async`

```python
def exists(path: str) -> bool
```

Whether a file or directory exists at the path.

###### Returns

[`bool`](https://docs.python.org/3/builtins/functions.html#bool)

### SupportsRealpath

**Bases:** [`Protocol`](https://docs.python.org/3/library/typing.html#typing.Protocol)

Native symlink resolution for path boundaries such as harness FileSystem's `root_dir`.

Without it, `Workspace.realpath` uses the backend's shell, and on a backend without commands it only normalizes the path as text, so path checks cannot see through symlinks. Implement it on a filesystem-only backend whose storage can hold symlinks.

#### Methods

##### realpath

`@async`

```python
def realpath(path: str) -> str
```

Resolve inside the environment, like `os.path.realpath(path, strict=False)`.

Relative link targets start in the link's directory; `..` after a link climbs from its target. Keep missing components as written. A loop must not hang; a returned path through a loop must stay inside the directory holding it (or raise `OSError`). Return an absolute, normalized path.

###### Returns

[`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

### CommandResult

The result of a completed command.

#### Attributes

##### exit\_code

The real exit code of the process. Non-zero is a normal result, not an error.

**Type:** [`int`](https://docs.python.org/3/builtins/functions.html#int)

##### stdout

Captured standard output.

**Type:** [`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

##### stderr

Captured standard error.

**Type:** [`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

### FileEntry

Metadata about a file or directory.

#### Attributes

##### name

Base name of the entry.

**Type:** [`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

##### path

Absolute POSIX path of the entry inside the workspace.

**Type:** [`str`](https://docs.python.org/3/builtins/stdtypes.html#str)

##### is\_dir

Whether the entry is a directory, following a symlink to its target.

**Type:** [`bool`](https://docs.python.org/3/builtins/functions.html#bool)

##### size

Size in bytes for a regular file when known; `None` is allowed (the shell fallback can measure it).

**Type:** [`int`](https://docs.python.org/3/builtins/functions.html#int) | [`None`](https://docs.python.org/3/builtins/constants.html#None)

### WorkspaceError

**Bases:** [`RuntimeError`](https://docs.python.org/3/builtins/exceptions.html#RuntimeError)

The workspace layer deliberately failed an operation.

### WorkspaceUnavailableError

**Bases:** `WorkspaceError`

The environment is gone or unusable (terminated, expired, not found), so retrying can't succeed.

### WorkspaceTimeoutError

**Bases:** `WorkspaceError`, [`TimeoutError`](https://docs.python.org/3/builtins/exceptions.html#TimeoutError)

A command exceeded its `timeout=`; `stdout`/`stderr` hold partial output, like `subprocess.TimeoutExpired`.

### WorkspaceOutputLimitError

**Bases:** `WorkspaceError`

A command exceeded its output cap; `stdout` and `stderr` hold their captured beginnings.

### WorkspaceReadOnlyError

**Bases:** `WorkspaceError`, [`PermissionError`](https://docs.python.org/3/builtins/exceptions.html#PermissionError)

A mutation was refused because the workspace is read-only.

Raised by [`ReadOnlyWorkspace`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.ReadOnlyWorkspace) and wrappers like it.

### WorkspaceCommand

An argv sequence (`['python', '-c', 'print(1)']`), or a shell string with `shell=True`.

**Type:** [`TypeAlias`](https://docs.python.org/3/library/typing.html#typing.TypeAlias) **Default:** `str | Sequence[str]`

# `pydantic_ai.workspaces.conformance`

The conformance suite for Pydantic AI workspace backends.

Subclass `WorkspaceBackendSuite` in a pytest module and provide a `backend` fixture: each test checks one rule of the `WorkspaceBackend` contract, the same rules the built-in and provider backends pass. Requires pytest and the anyio pytest plugin.

### WorkspaceBackendSuite

Subclass in your test suite and provide the `backend` fixture.

Each test checks one rule of the backend contract. Command rules skip for a backend without `SupportsCommands`; filesystem rules run through [`Workspace`](https://pydantic.dev/docs/ai/api/pydantic-ai/workspaces/#pydantic_ai.workspaces.Workspace), so a command-only backend is checked on the file operations derived through its shell. The reattach rules need the optional fixtures below and skip without them.

#### Methods

##### fresh\_backend

```python
def fresh_backend() -> Callable[[], WorkspaceBackend] | None
```

Build an uninitialized backend to check concurrent first use, if supported.

###### Returns

[`Callable`](https://docs.python.org/3/library/typing.html#typing.Callable)\[\[\], `WorkspaceBackend`\] | [`None`](https://docs.python.org/3/builtins/constants.html#None)

##### destructive\_backend

```python
def destructive_backend(
    fresh_backend: Callable[[], WorkspaceBackend] | None,
) -> Callable[[], WorkspaceBackend] | None
```

Build an independent environment for destruction; defaults to `fresh_backend`.

###### Returns

[`Callable`](https://docs.python.org/3/library/typing.html#typing.Callable)\[\[\], `WorkspaceBackend`\] | [`None`](https://docs.python.org/3/builtins/constants.html#None)

##### attach\_backend

```python
def attach_backend() -> Callable[[WorkspaceRef], WorkspaceBackend] | None
```

Build a second backend that attaches to `ref`. Enables the reattach rules.

###### Returns

[`Callable`](https://docs.python.org/3/library/typing.html#typing.Callable)\[\[`WorkspaceRef`\], `WorkspaceBackend`\] | [`None`](https://docs.python.org/3/builtins/constants.html#None)

##### destroy\_environment

```python
def destroy_environment() -> Callable[[WorkspaceBackend], Awaitable[None]] | None
```

Destroy the environment behind `backend`. Enables the reattach-after-destroy rule.

###### Returns

[`Callable`](https://docs.python.org/3/library/typing.html#typing.Callable)\[\[`WorkspaceBackend`\], [`Awaitable`](https://docs.python.org/3/library/typing.html#typing.Awaitable)\[[`None`](https://docs.python.org/3/builtins/constants.html#None)\]\] | [`None`](https://docs.python.org/3/builtins/constants.html#None)

##### test\_command\_form\_must\_match\_shell

`@async`

```python
def test_command_form_must_match_shell(backend: WorkspaceBackend) -> None
```

A string needs `shell=True` and an argv sequence needs `shell=False`; a mismatch is a `TypeError`.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### test\_stdin\_is\_at\_eof

`@async`

```python
def test_stdin_is_at_eof(backend: WorkspaceBackend) -> None
```

Noninteractive commands never wait for input from the caller.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### test\_command\_output\_is\_complete

`@async`

```python
def test_command_output_is_complete(backend: WorkspaceBackend) -> None
```

If output cannot be collected in full, the backend must raise rather than return a truncated success.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### can\_detect\_exit\_with\_inherited\_output\_pipes

```python
def can_detect_exit_with_inherited_output_pipes() -> bool
```

Override only if the SDK cannot report exit independently of pipe EOF (E2B currently cannot).

###### Returns

[`bool`](https://docs.python.org/3/builtins/functions.html#bool)

##### test\_result\_reports\_exit\_code\_stdout\_and\_stderr

`@async`

```python
def test_result_reports_exit_code_stdout_and_stderr(backend: WorkspaceBackend) -> None
```

A non-zero exit is a normal result, not an error.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### test\_a\_missing\_program\_exits\_127

`@async`

```python
def test_a_missing_program_exits_127(backend: WorkspaceBackend) -> None
```

Like `sh`, a program that doesn't exist is a normal result with exit code 127, not an error.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### test\_working\_dir\_is\_canonical

`@async`

```python
def test_working_dir_is_canonical(backend: WorkspaceBackend) -> None
```

Absolute, symlinks resolved, no `.`/`..`: the directory commands actually start in.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### test\_large\_file\_round\_trip

`@async`

```python
def test_large_file_round_trip(backend: WorkspaceBackend) -> None
```

A shell-derived filesystem must page reads rather than hit a command-output cap.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### has\_real\_posix\_shell

```python
def has_real_posix_shell() -> bool
```

Only a test double with no POSIX process/filesystem can opt out.

###### Returns

[`bool`](https://docs.python.org/3/builtins/functions.html#bool)

##### enforces\_parent\_file\_errors

```python
def enforces_parent_file_errors() -> bool
```

Opt out only for an in-memory test double without real path traversal.

###### Returns

[`bool`](https://docs.python.org/3/builtins/functions.html#bool)

##### filesystem\_honors\_shell\_permissions

```python
def filesystem_honors_shell_permissions() -> bool
```

Override only for provider file APIs that bypass the command user's permissions (e.g. E2B envd).

###### Returns

[`bool`](https://docs.python.org/3/builtins/functions.html#bool)

##### test\_native\_realpath\_keeps\_the\_working\_dir\_and\_missing\_names

`@async`

```python
def test_native_realpath_keeps_the_working_dir_and_missing_names(
    backend: WorkspaceBackend,
) -> None
```

Checked without commands, so a filesystem-only backend's `realpath` is covered too.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)

##### test\_a\_backend\_attached\_by\_ref\_reaches\_the\_same\_environment

`@async`

```python
def test_a_backend_attached_by_ref_reaches_the_same_environment(
    backend: WorkspaceBackend,
    attach_backend: Callable[[WorkspaceRef], WorkspaceBackend] | None,
) -> None
```

Durable execution rebuilds the backend from its ref for every call, so this is what it relies on.

###### Returns

[`None`](https://docs.python.org/3/builtins/constants.html#None)