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9 changes: 9 additions & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -145,6 +145,15 @@ npm install -S @modelcontextprotocol/ext-apps \
zod@^4.2.0
```

Still on the v1 SDK (`@modelcontextprotocol/sdk` 1.x)? Stay on `ext-apps` 1.x,
which peers on `@modelcontextprotocol/sdk@^1.29.0`; 2.x peers on the v2
packages above instead, so `npm install @modelcontextprotocol/ext-apps` on its
own pulls in a second SDK next to yours:

```bash
npm install -S @modelcontextprotocol/ext-apps@^1 @modelcontextprotocol/sdk@^1.29.0
```

The wire protocol is unchanged between `ext-apps` 1.x and 2.x: a 2.x View works
in a 1.x host and a 2.x host renders 1.x Views. See the
[migration guide](https://apps.extensions.modelcontextprotocol.io/api/documents/migrate-to-v2.html)
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