Two directions, and they use different machinery.
Outward - the platform calls something. That is the connector registry: typed operations with declared inputs and outputs, invoked from a process step, from a durable workflow, or by an AI agent through the bridge into the tool plane. One registry, one credential story, one audit path.
Inward - something calls the platform. That is the API surface and the MCP endpoint, which is how an external AI client works against the platform's own operations under the caller's own authority.
The pages
- Connectors - what ships, how an operation is declared, credentials and retries.
- Custom connectors - adding one, and what you get for free by declaring it properly.
- MCP - the tool endpoint, in both directions.