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maxisbey merged 1 commit into from
Jun 30, 2026
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Point pre-release install pins at 2.0.0b1 #3039

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4 changes: 2 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -41,10 +41,10 @@ Python 3.10+.
## Installation

```bash
uv add "mcp[cli]==2.0.0a3" # or: pip install "mcp[cli]==2.0.0a3"
uv add "mcp[cli]==2.0.0b1" # or: pip install "mcp[cli]==2.0.0b1"
```

The pin matters while v2 is in pre-release: an unpinned install resolves to the latest stable v1.x, which this README does not describe. Check [PyPI](https://pypi.org/project/mcp/#history) for the newest pre-release, and use `uv run --with "mcp==2.0.0a3"` for one-off commands.
The pin matters while v2 is in pre-release: an unpinned install resolves to the latest stable v1.x, which this README does not describe. Check [PyPI](https://pypi.org/project/mcp/#history) for the newest pre-release, and use `uv run --with "mcp==2.0.0b1"` for one-off commands.

## A server in 15 lines

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8 changes: 4 additions & 4 deletions docs/index.md
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Expand Up @@ -21,21 +21,21 @@ Python 3.10+.
=== "uv"

```bash
uv add "mcp[cli]==2.0.0a3"
uv add "mcp[cli]==2.0.0b1"
```

=== "pip"

```bash
pip install "mcp[cli]==2.0.0a3"
pip install "mcp[cli]==2.0.0b1"
```

The `[cli]` extra gives you the `mcp` command; you'll want it for development.

!!! warning "Pin the version while v2 is in alpha"
!!! warning "Pin the version while v2 is in beta"
Installers never select a pre-release unless you name one, so an unpinned `uv add "mcp[cli]"`
gives you the latest **v1.x** release, which this documentation does not describe. Check
[PyPI](https://pypi.org/project/mcp/#history) for the newest alpha before you copy the line
[PyPI](https://pypi.org/project/mcp/#history) for the newest beta before you copy the line
above. See [Installation](installation.md) for the details.

## Example
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10 changes: 5 additions & 5 deletions docs/installation.md
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Expand Up @@ -2,27 +2,27 @@

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

These docs describe **v2**, which is in alpha, so the version pin is not optional yet:
These docs describe **v2**, which is in beta, so the version pin is not optional yet:

=== "uv"

```bash
uv add "mcp[cli]==2.0.0a3"
uv add "mcp[cli]==2.0.0b1"
```

=== "pip"

```bash
pip install "mcp[cli]==2.0.0a3"
pip install "mcp[cli]==2.0.0b1"
```

!!! warning "Why the pin"
Installers never select a pre-release unless you name one, so an unpinned `uv add "mcp[cli]"`
gives you the latest **v1.x** release, which these docs do not describe. Check the
[release history](https://pypi.org/project/mcp/#history) for the newest alpha before you copy
[release history](https://pypi.org/project/mcp/#history) for the newest beta before you copy
the line above.

The same applies to one-off commands: `uv run --with "mcp==2.0.0a3" ...`, not `uv run --with mcp ...`.
The same applies to one-off commands: `uv run --with "mcp==2.0.0b1" ...`, not `uv run --with mcp ...`.

If your *package* depends on `mcp`, add a `<2` upper bound (for example `mcp>=1.27,<2`) before
the stable v2 lands so the major version bump doesn't surprise you.
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