# Complete hosted platform OAuth callback

**GET /auth/oauth/callback**

Public browser callback for PLATFORM_OAUTH_REDIRECT_URI. Validates state and browser-binding cookie, exchanges the code, reconciles Atlas roles when applicable, and either resumes Agent Engine OIDC login or redirects to the in-app next path.


## Servers
- https://agentengine.mongodb.com: https://agentengine.mongodb.com ()


## Authentication methods
- Bearer auth


## Parameters


### Query parameters

- **state** (string)
  Opaque pending-grant state

- **code** (string)
  Authorization code

- **error** (string)
  Authorization-server error

- **error_description** (string)
  Authorization-server error description



## Responses
### 302
Redirect to Agent Engine OTC callback, in-app next, or coarse error destination

#### Body: application/json (string)
string
### 409
Authorization or login finalization already in progress

#### Body: application/json (string)
string
### 503
Platform OAuth not configured

#### Body: application/json (string)
string

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