feat: add configurable OAuth redirect uri

[joshrutkowski]

Add support for custom redirect URI to support multiple remote MCP servers and requirement where an MCP server may require a hardcoded port. When not assigned in the mcp configuration, the current experience is preserved (randomly assigned port)

Issue #, if available: Request to be able to specify port/have dedicated port for redirect_uri since currently it was randomly assigned and this cannot be supported by the OAuth provider.

Description of changes:

Adds ability to specify a default OAuth redirect uri, per mcp server (similar to Gemini CLI)

Example configuration

{

  "mcpServers": {

    "stripe": {

      "type": "http",

      "url": "https://mcp.stripe.com",

      "oauth": {

        "redirectUri": "127.0.0.1:7777"

      }

    },

    "vercel": {

      "type": "http",

      "url": "https://mcp.vercel.com",

      "oauth": {

        "redirectUri": "127.0.0.1:7778"

      }

    }

  }

}

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[joshrutkowski]

Another commit incoming - need to rework this in the event of multiple remote MCPs, I see this

- Mcp error: -32002: Address already in use (os error 48)

[brandonskiser]

nit - import OAuthConfig

[brandonskiser]

Assuming we want this to more or less match what you linked w/ gemini - https://github.com/google-gemini/gemini-cli/blob/main/docs/tools/mcp-server.md#oauth-configuration-properties

There's already a top-level oauth_scopes unfortunately which could've been included in here, but I think it does make sense to add any and all future OAuth related config items here going forward

[joshrutkowski]

If i have some time this week, I can refactor oauth_scopes to be inside this config to consolidate this going forward

[brandonskiser]

Thank you!