# Capabilities operations

> Runtime support discovery for capability-aware branching.



2 operations. Names, descriptions, and behavior flags come from the canonical contract.

## Operations

- [`capabilities.get`](/document-api/reference/capabilities/get) (read): Query runtime capabilities supported by the current document engine.
- [`capabilities.check`](/document-api/reference/capabilities/check) (read): Check an exact HTML or Markdown insert, replace, or detailed projection against the current document without mutating it.