> ## Documentation Index > Fetch the complete documentation index at: https://docs.runaether.dev/llms.txt > Use this file to discover all available pages before exploring further. # Connect an MCP server with OAuth > Starts your own connection to a server that authenticates with OAuth, or its reconnection: discovers its authorization server, chooses Aether's client identity there, and returns the authorization URL to send your browser to. The authorization server returns the browser to the web app, which finishes the connection with finishMcpServerOAuth in your session, then goes to return_to when the request named it (the Aether mobile app's deep link), otherwise to the Integrations tab. ## OpenAPI ````yaml api-reference/openapi.v1.json POST /mcp-servers/{mcpServerID}/connection/oauth openapi: 3.1.0 info: title: Aether Public API version: 0.1.0 description: >- The versioned, public Aether REST API. Authenticate with an `aether_` platform API key or a session token. servers: - url: https://api.runaether.dev/v1 security: - bearerAuth: [] paths: /mcp-servers/{mcpServerID}/connection/oauth: post: tags: - mcp-servers summary: Connect an MCP server with OAuth description: >- Starts your own connection to a server that authenticates with OAuth, or its reconnection: discovers its authorization server, chooses Aether's client identity there, and returns the authorization URL to send your browser to. The authorization server returns the browser to the web app, which finishes the connection with finishMcpServerOAuth in your session, then goes to return_to when the request named it (the Aether mobile app's deep link), otherwise to the Integrations tab. operationId: startMcpServerOAuth parameters: - in: path name: mcpServerID required: true schema: format: uuid type: string requestBody: content: application/json: schema: $ref: '#/components/schemas/StartMcpServerOAuthRequest' required: true responses: '200': content: application/json: schema: $ref: '#/components/schemas/McpServerOAuthAuthorization' description: OK '400': content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' description: Bad Request '401': content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' description: Unauthorized '403': content: application/json: schema: anyOf: - $ref: '#/components/schemas/ErrorResponse' - $ref: '#/components/schemas/OrgAuthorizationErrorResponse' description: Forbidden '404': content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' description: Not Found '409': content: application/json: schema: $ref: '#/components/schemas/McpServerErrorResponse' description: Conflict '422': content: application/json: schema: anyOf: - $ref: '#/components/schemas/ErrorResponse' - $ref: '#/components/schemas/McpServerErrorResponse' description: Unprocessable Entity '500': content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' description: Internal Server Error '503': content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' description: Service Unavailable components: schemas: StartMcpServerOAuthRequest: additionalProperties: false properties: return_to: description: >- Where the web app's callback page sends the browser with the outcome once it has finished the connection: the Aether mobile app's deep link. Omitted, the page returns to the Integrations tab. enum: - aether://mcp-connected type: string url: description: >- The server URL the connection is started for, as the catalog showed it. Refused with mcp_connection_server_changed when the server's URL is now another. maxLength: 2048 minLength: 1 type: string required: - url type: object McpServerOAuthAuthorization: additionalProperties: false properties: authorization_url: format: uri type: string required: - authorization_url type: object ErrorResponse: additionalProperties: false properties: code: type: string error: minLength: 1 type: string errors: items: $ref: '#/components/schemas/ErrorDetail' type: array required: - error type: object OrgAuthorizationErrorResponse: additionalProperties: false properties: code: enum: - org_membership_required - org_role_insufficient - org_suspended - account_deleting type: string error: minLength: 1 type: string required: - error - code type: object McpServerErrorResponse: additionalProperties: false properties: code: enum: - mcp_server_key_invalid - mcp_server_key_reserved - mcp_server_key_taken - mcp_server_key_taken_on_agent - mcp_server_display_name_invalid - mcp_server_url_invalid - mcp_server_runtime_invalid - mcp_server_package_invalid - mcp_server_version_unpinned - mcp_server_args_invalid - mcp_server_env_invalid - mcp_server_kind_change_refused - mcp_server_address_refused - mcp_server_unreachable - mcp_server_not_mcp - mcp_server_auth_unsupported - mcp_server_auth_discovery_failed - mcp_server_response_too_large - mcp_credential_policy_required - mcp_credential_policy_not_applicable - mcp_credential_policy_org_unavailable - mcp_server_api_key_not_applicable - mcp_connection_static_secret_not_accepted - mcp_connection_secret_invalid - mcp_connection_server_changed - mcp_server_aether_managed - mcp_connection_github_not_connected - mcp_connection_org_not_offered - mcp_server_headers_invalid - mcp_connection_oauth_not_accepted - mcp_oauth_not_advertised - mcp_oauth_pkce_unsupported - mcp_oauth_app_required - mcp_oauth_registration_failed - mcp_server_plugin_bundled - mcp_repo_config_invalid - mcp_oauth_app_issuer_invalid - mcp_oauth_app_invalid - mcp_oauth_app_auth_method_unsupported - mcp_server_directory_managed - mcp_server_not_from_directory - mcp_server_directory_moved - integration_not_in_directory - integration_shape_changed - mcp_server_switched_off type: string error: minLength: 1 type: string required: - error - code type: object ErrorDetail: additionalProperties: false properties: location: description: >- Where the error occurred, e.g. 'body.items[3].tags' or 'path.thing-id' type: string message: description: Error message text type: string value: description: The value at the given location type: object securitySchemes: bearerAuth: bearerFormat: JWT scheme: bearer type: http ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.