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Remove hardcoded prefab-ui version from pinning warnings (#3708)

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Jeremiah Lowin 2026-03-30 11:09:26 -04:00 • committed by GitHub
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8
docs/apps/overview.mdx
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@ -29,13 +29,7 @@ This installs [Prefab UI](https://prefab.prefect.io), the component library used
</Note>
<Warning>
FastMCP pins a **minimum** version of `prefab-ui` for compatibility but intentionally does **not** pin an upper bound. Prefab is a rapidly evolving library with frequent breaking changes. If you are deploying to production, you **must** pin `prefab-ui` to a specific version in your own dependencies:
```
prefab-ui==0.15.0
```
Without a pin, a `pip install --upgrade` or fresh deploy could pull a newer Prefab version that changes component APIs, breaking your app. FastMCP's minimum ensures baseline compatibility; your pin ensures stability.
FastMCP pins a **minimum** version of `prefab-ui` for compatibility but intentionally does **not** pin an upper bound. Prefab is a rapidly evolving library with frequent breaking changes. If you are deploying to production, you **must** pin `prefab-ui` to a specific version in your own dependencies. Without a pin, a fresh deploy could pull a newer Prefab version that changes component APIs, breaking your app.
</Warning>
## Which Approach?

2
docs/apps/prefab.mdx
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@ -11,7 +11,7 @@ import { VersionBadge } from '/snippets/version-badge.mdx'
<VersionBadge version="3.1.0" />
<Warning>
[Prefab](https://prefab.prefect.io) is in early, active development — breaking changes can occur with any release. FastMCP pins a minimum version of `prefab-ui` for compatibility but does not pin an upper bound. If you are deploying to production, **pin `prefab-ui` to a specific version** in your own dependencies (e.g. `prefab-ui==0.15.0`).
[Prefab](https://prefab.prefect.io) is in early, active development — breaking changes can occur with any release. FastMCP pins a minimum version of `prefab-ui` for compatibility but does not pin an upper bound. If you are deploying to production, **pin `prefab-ui` to a specific version** in your own dependencies.
</Warning>
[Prefab UI](https://prefab.prefect.io) is the component library behind all FastMCP app features. You describe layouts, charts, tables, and forms in Python, and Prefab compiles them to interactive UIs that render in the host's conversation.