Canva Design Editing

The canonical, safe way to apply edits to an existing Canva design. Every Canva skill that mutates a design should follow this exact protocol: start a transaction → perform operations → commit (with approval). Changes are draft-only until committed and are PERMANENTLY LOST if not committed.

The Transaction Protocol (always these steps, in order)

1. Canva:start-editing-transaction — pass the design_id. Remember the returned transaction_id and the pages array; both are required by later calls. ALWAYS show the user the thumbnail(s) returned here.
2. Canva:perform-editing-operations — apply edits. Pass the transaction_id, the pages array from the previous response, the page_index of the first page being changed, and an operations array. Batch multiple operations into a single call wherever possible.
3. Canva:commit-editing-transaction — save. See the approval gate below. After committing, the transaction_id is invalid; a new edit needs a new transaction.
4. Canva:cancel-editing-transaction — discard the draft instead of saving (e.g. the user rejects the preview, or you opened a transaction only to inspect the design).

Capabilities — what the API CAN and CANNOT do