Add document for specifying Python interpreter in tool installation and upgrade commands.

docs/guides/tools.md

@@ -237,6 +237,33 @@ To instead upgrade all tools:
 $ uv tool upgrade --all
 ```
 
+## Requesting Python versions
+
+By default, uv will use your default Python interpreter (the first it finds) when when running,
+installing, or upgrading tools. You can specify the Python interpreter to use with the `--python`
+option.
+
+For example, to request a specific Python version when running a tool:
+
+```console
+$ uvx --python 3.10 ruff
+```
+
+Or, when installing a tool:
+
+```console
+$ uv tool install --python 3.10 ruff
+```
+
+Or, when upgrading a tool:
+
+```console
+$ uv tool upgrade --python 3.10 ruff
+```
+
+For more details on requesting Python versions, see the
+[Python version](../concepts/python-versions.md#requesting-a-version) concept page..
+
 ## Next steps
 
 To learn more about managing tools with uv, see the [Tools concept](../concepts/tools.md) page and