fastmcp/docs/python-sdk/fastmcp-utilities-mcp_server_config-v1-environments-uv.mdx
Jeremiah Lowin 9b248a15b3
Update repository references for transfer to prefecthq (#3207)
* Update repository references from jlowin/fastmcp to prefecthq/fastmcp

* Retrigger CI after repo transfer

* chore: Update SDK documentation

* Only run deep triage on bug issues for jlowin

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Co-authored-by: marvin-context-protocol[bot] <225465937+marvin-context-protocol[bot]@users.noreply.github.com>
2026-02-18 10:33:56 -05:00

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---
title: uv
sidebarTitle: uv
---
# `fastmcp.utilities.mcp_server_config.v1.environments.uv`
## Classes
### `UVEnvironment` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/utilities/mcp_server_config/v1/environments/uv.py#L14" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
Configuration for Python environment setup.
**Methods:**
#### `build_command` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/utilities/mcp_server_config/v1/environments/uv.py#L49" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
build_command(self, command: list[str]) -> list[str]
```
Build complete uv run command with environment args and command to execute.
**Args:**
- `command`: Command to execute (e.g., ["fastmcp", "run", "server.py"])
**Returns:**
- Complete command ready for subprocess.run, including "uv" prefix if needed.
- If no environment configuration is set, returns the command unchanged.
#### `prepare` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/utilities/mcp_server_config/v1/environments/uv.py#L109" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
prepare(self, output_dir: Path | None = None) -> None
```
Prepare the Python environment using uv.
**Args:**
- `output_dir`: Directory where the persistent uv project will be created.
If None, creates a temporary directory for ephemeral use.