canva-edit-design

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

CAN (operations on perform-editing-operations)

• Text content: replace_text (whole element), find_and_replace_text (substring)
• Text formatting (format_text): font size, weight (normal/bold), style (normal/italic), color, alignment, line height, underline, strikethrough, links, list level/marker
• Media: update_fill (replace image/video), insert_fill (add image/video), delete_element
• Layout: position_element, resize_element
• Metadata: update_title
• Autofill mapping: update_autofill_field (fixed-page designs only)

CANNOT

• Change font family/typeface (only size, weight, style)
• Add new text elements (you can only insert media, not new text boxes)
• Change background colors or gradients
• Add, remove, or reorder pages/slides
• Modify animations, transitions, or element opacity (except on newly inserted fills)
• Group/ungroup elements, or restyle shapes (only text inside shapes is editable)

When a requested change is in the CANNOT list, tell the user it must be done manually in the Canva editor — don't attempt a workaround.

Responsive pages — restricted operation set

Some pages come back marked is_responsive: true. On those pages, ONLY these operations are allowed: update_title, replace_text, update_fill, delete_element, find_and_replace_text.

Before calling perform-editing-operations, check the pages array. If any operation targets a responsive page with an unsupported op (e.g. format_text, position_element, resize_element, insert_fill), do NOT make the call — tell the user that operation isn't supported on that page and offer an alternative.

The commit approval gate (required)

commit-editing-transaction makes changes permanent. You MUST show the user exactly what changed (and the preview thumbnail) and get explicit approval before committing — e.g. "Here's the preview. Save these changes to your design?" Wait for a clear yes.

• Do NOT commit without approval.
• Do NOT tell the user changes are saved before the commit call has succeeded.
• After a successful commit, give the user a direct link to open the design in Canva.
• If a commit fails, all changes are lost — start a new transaction to retry.

Note for composing skills: a skill that already collects a single up-front approval for a batch of changes (e.g. canva-implement-feedback) should treat that approval as covering the commit and NOT ask again. Follow that skill's own confirmation rules; the gate above is the default for direct, ad-hoc edits.

Workflow

Step 1: Resolve the design

• Short link (canva.link/...) → Canva:resolve-shortlink to get the URL.
• Full Canva URL → extract the design ID (the segment after /design/).
• Raw design ID (starts with D) → use directly; do NOT search.
• Nothing provided → ask for the design ID or link.

Step 2: Start the transaction and inspect

Call Canva:start-editing-transaction. Show the thumbnail(s). Use the returned content to locate the exact element_ids you need to target. (If you only needed to look, call cancel-editing-transaction and stop.)

Step 3: Build and perform operations

Translate the user's request into concrete operations. Confirm scope first when a find_and_replace_text string could match in multiple places or contexts — ask which instances they mean. Batch all operations into one perform-editing-operations call when you can.

Step 4: Preview and commit

Show the resulting thumbnail and a plain-language list of what changed. Ask for approval, then commit-editing-transaction. Share the edit link.

Rules

• Always remember and reuse the transaction_id and pages array within a transaction.
• Never leave a transaction uncommitted without telling the user their draft was discarded.
• For destructive ops (delete_element, large find_and_replace_text), confirm scope before performing.
• Prefer one batched perform-editing-operations call over many small ones.