Developers & agents
Twelfth Developer Resources
Twelfth exposes a read-only Model Context Protocol (MCP) server for approved assistants and automations. The public developer surface is intentionally narrow: use MCP to inspect the active workspace, its operating defaults, members and open actions without creating or changing operational records.
Workspace owners and admins create a dedicated bearer key in Twelfth under Settings → AI & agents. Each connection should have its own labelled key so access can be audited and revoked without affecting another assistant. The public MCP endpoint is https://api.twelfth.ai/mcp.
Twelfth does not currently offer a general-purpose public REST API or customer-configurable outbound webhook product. The OpenAPI description documents the public MCP transport and authentication boundary; provider webhooks used by managed integrations are documented separately so developers do not mistake them for customer endpoints.
Developer resources
- Twelfth MCP serverWhen to use it, supported jobs, endpoint and connection flow.
- Twelfth authenticationCreate, send, rotate and revoke workspace-scoped bearer keys.
- Twelfth webhooksWhat managed provider webhooks exist and what is not public.
- Twelfth OpenAPI descriptionMachine-readable description of the public MCP HTTP transport, typed errors, versioning and rate limits.
- Twelfth llms.txtAgent-readable map of Twelfth's public pages and developer resources.
- Twelfth product documentationProduct setup, workspace administration and AI connection guides.