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feat(server): OAuth scope challenge support (step-up auth) #1624

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feat(server): OAuth scope challenge support (step-up auth) #1624

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feat(server): add OAuth scope challenge support (step-up auth)
SamMorrowDrums Mar 4, 2026
b7c3ad1
chore: add changeset for scope challenge feature
SamMorrowDrums Mar 4, 2026
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Merge branch 'main' into scope-challenge-server-sdk
KKonstantinov Mar 4, 2026
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19 changes: 19 additions & 0 deletions .changeset/scope-challenge-server.md
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---
'@modelcontextprotocol/server': minor
'@modelcontextprotocol/node': minor
---

Add server-side OAuth scope challenge support (step-up auth) per MCP spec §10.1.

Servers can now declare required OAuth scopes per tool and the Streamable HTTP transport
automatically returns HTTP 403 with `WWW-Authenticate` headers when a client's token
lacks sufficient scopes, triggering the client's existing re-authorization flow.

New APIs:
- `ToolScopeConfig` type for declaring `required` and `accepted` scopes per tool
- `ScopeChallengeConfig` transport option with `resourceMetadataUrl`
- `McpServer.registerTool()` accepts a `scopes` option (`string[]` or `ToolScopeConfig`)
- `McpServer.setToolScopes()` for decoupled/centralized scope declaration
- `McpServer.getToolScopes()` to query resolved scope config
- `setScopeResolver()` on both `WebStandardStreamableHTTPServerTransport` and `NodeStreamableHTTPServerTransport`
- Auto-wiring of scope resolver in `McpServer.connect()`
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