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# Docs by LangChain > Documentation for LangSmith, Fleet, and our open source packages. ## Docs - [Create Connection](https://docs.langchain.com/api-reference/agent-connections-v2/create-connection.md) - [List Connections](https://docs.langchain.com/api-reference/agent-connections-v2/list-connections.md) - [Remove Connection](https://docs.langchain.com/api-reference/agent-connections-v2/remove-connection.md) - [Authenticate](https://docs.langchain.com/api-reference/auth-service-v2/authenticate.md): Get OAuth token or start authentication flow if needed. - [Check Oauth Token Exists](https://docs.langchain.com/api-reference/auth-service-v2/check-oauth-token-exists.md): Return whether the current user has any tokens for a given provider (across agents). - [Check Workspace Slack Tokens Exist](https://docs.langchain.com/api-reference/auth-service-v2/check-workspace-slack-tokens-exist.md): Check if the workspace has any Slack tokens. - [Create Mcp Oauth Provider](https://docs.langchain.com/api-reference/auth-service-v2/create-mcp-oauth-provider.md): Create an OAuth provider via MCP auto-discovery. - [Create Oauth Provider](https://docs.langchain.com/api-reference/auth-service-v2/create-oauth-provider.md): Create a new OAuth provider manually. - [Delete Oauth Provider](https://docs.langchain.com/api-reference/auth-service-v2/delete-oauth-provider.md): Delete an OAuth provider. - [Delete Oauth Tokens For User](https://docs.langchain.com/api-reference/auth-service-v2/delete-oauth-tokens-for-user.md): Delete all tokens for the current user for the given provider (across agents). - [Delete Single Oauth Token](https://docs.langchain.com/api-reference/auth-service-v2/delete-single-oauth-token.md): Delete a specific OAuth token, revoking it at the provider first. - [Get Oauth Provider](https://docs.langchain.com/api-reference/auth-service-v2/get-oauth-provider.md): Get a specific OAuth provider. - [List Oauth Providers](https://docs.langchain.com/api-reference/auth-service-v2/