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Document ClientOAuthOptions.ScopeSelector usage by z0rimo · Pull Request #1869 · modelcontextprotocol/csharp-sdk · GitHub

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Document ClientOAuthOptions.ScopeSelector usage #1869

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Document ClientOAuthOptions.ScopeSelector usage #1869

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docs: document OAuth scope selection
z0rimo Sep 11, 2026
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Merge branch 'main' into docs/oauth-scope-selector-1867
z0rimo Sep 21, 2026
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23 changes: 23 additions & 0 deletions docs/concepts/transports/transports.md
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Expand Up @@ -145,6 +145,29 @@ var transport = new HttpClientTransport(new HttpClientTransportOptions
});
```

#### OAuth scope selection

When OAuth is configured through <xref:ModelContextProtocol.Client.HttpClientTransportOptions.OAuth>, <xref:ModelContextProtocol.Authentication.ClientOAuthOptions.Scopes> provides fallback scopes only when the server does not provide scope information through the `WWW-Authenticate` header or Protected Resource Metadata.

To filter or customize the scopes selected from server-provided information, use <xref:ModelContextProtocol.Authentication.ClientOAuthOptions.ScopeSelector>. The selector runs after the SDK has resolved the candidate scopes and appended `offline_access` when advertised by the authorization server. The returned scopes are used consistently for the authorization request and Dynamic Client Registration.

```csharp
using ModelContextProtocol.Authentication;

var transport = new HttpClientTransport(new HttpClientTransportOptions
{
Endpoint = new Uri("https://my-mcp-server.example.com/mcp"),
OAuth = new ClientOAuthOptions
{
RedirectUri = new Uri("http://localhost:1179/callback"),
ScopeSelector = scopes =>
scopes?.Where(scope => scope is "mcp:tools" or "mcp:resources")
}
});
```

Return `null` or an empty sequence from `ScopeSelector` to omit the `scope` parameter entirely.

#### Resuming sessions

Streamable HTTP supports session resumption. Save the session ID, server capabilities, and server info from the original session, then use <xref:ModelContextProtocol.Client.McpClient.ResumeSessionAsync*> to reconnect:
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