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Notion (DCR) is a bundled OAuth2 provider in authsome. Notion via the Model Context Protocol endpoint. For the standard OAuth flow against api.notion.com, use notion.

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At a glance

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Prerequisites

Notion’s MCP endpoint (mcp.notion.com) supports Dynamic Client Registration. You do not need to register an OAuth app. Authsome registers a client automatically.

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Log in

The first time, authsome opens a local form at http://127.0.0.1:7998 to collect your client_id and client_secret. They are encrypted in your vault and reused on every subsequent login. A second browser window then opens to https://mcp.notion.com/authorize for the authorization step. Verify:

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Multiple accounts

Pass --connection <name> on login and on every read command to keep two or more accounts on the same provider side by side. See Multiple connections per provider for the full pattern.

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Use the token

Run the agent under the proxy (recommended).
Under the proxy, authsome sets NOTION_ACCESS_TOKEN=authsome-proxy-managed in the child’s environment and injects the real token into outbound requests to mcp.notion.com. The child process never sees the actual value. Refresh tokens are never exported.

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Override the bundled definition

User-registered files always win over bundled definitions.

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What’s next

Run agents with the proxy

Inject the access token into outbound requests without exposing it.

Multiple connections per provider

Keep two or more accounts on the same provider side by side.

OAuth providers

All bundled OAuth providers.