# Installation

The Python SDK is on PyPI as [`mcp`](https://pypi.org/project/mcp/). It requires **Python 3.10+**.

These docs describe **v2**, the current stable release line:

=== "uv"

    ```bash
    uv add "mcp[cli]"
    ```

=== "pip"

    ```bash
    pip install "mcp[cli]"
    ```

!!! note "Coming from v1?"
    v2 is a major version with breaking changes; the **[Migration Guide](../migration.md)**
    covers every one. If your *package* depends on `mcp` and isn't ready to migrate, keep a
    `<2` upper bound (for example `mcp>=1.28,<2`) so an unpinned resolve stays on the 1.x line.

## What gets installed

You don't need to know any of this to use the SDK, but if you're wondering what each dependency is for:

* `mcp-types`: every protocol type (requests, results, content blocks) as its own package, versioned in lockstep with the SDK. Every `from mcp_types import ...` in these docs is this package.
* [`anyio`](https://anyio.readthedocs.io/): the async runtime. The whole SDK is written against anyio, so it runs on either `asyncio` or `trio`.
* [`pydantic`](https://docs.pydantic.dev/): what every `mcp_types` model is built on, plus all schema generation and validation.
* [`httpx2`](https://pypi.org/project/httpx2/): the HTTP client behind the Streamable HTTP and SSE *client* transports, with server-sent events support built in.
* [`starlette`](https://www.starlette.io/), [`uvicorn`](https://www.uvicorn.org/), [`sse-starlette`](https://pypi.org/project/sse-starlette/), and [`python-multipart`](https://pypi.org/project/python-multipart/): the HTTP *server* transports.
* [`jsonschema`](https://pypi.org/project/jsonschema/): validates a tool's structured output against its declared output schema.
* [`pyjwt[crypto]`](https://pyjwt.readthedocs.io/): OAuth token handling for authorization.
* [`opentelemetry-api`](https://opentelemetry-python.readthedocs.io/): just the lightweight API, so the SDK's tracing middleware costs nothing unless you install an OpenTelemetry SDK and exporter yourself.
* [`typing-extensions`](https://typing-extensions.readthedocs.io/) and [`typing-inspection`](https://pypi.org/project/typing-inspection/): modern typing features on Python 3.10.
* [`pywin32`](https://pypi.org/project/pywin32/): Windows only, used for `stdio` subprocess management.

## Optional extras

* `mcp[cli]` adds [`typer`](https://typer.tiangolo.com/) and [`python-dotenv`](https://pypi.org/project/python-dotenv/) for the `mcp` command-line tool (`mcp dev`, `mcp run`, `mcp install`). You'll want this during development; you may not need it in a deployed server.
* `mcp[rich]` adds [`rich`](https://rich.readthedocs.io/) for nicer server logs.