Read Canvas State Summary
Structural summary of the canvas: page index + node counts, no DSL payload.
The cheap-to-consume sibling of GET .../state (whose DSL can run to
hundreds of KB on big canvases). Computed from the SAME projection as the
full read — same optimizer chain, same per-page node reachability counts —
and it counts as a read for revision-pin purposes: revision is the same
read-lane token the full read returns, safe to pin as expected_revision.
Page ids are the same session-scoped p_* short refs the full read mints
(the mapping table is persisted), so they round-trip into the write verbs.
Authorizations
API key from Settings > Developer > REST API
Headers
Calendar-dated API version pin. New integrations should pin 2026-05-01 to opt into the newest response shapes. For back-compat the server also accepts requests with no header and resolves them to the current default (today: 2026-04-12); that default advances on each sunset date. Any unsupported value returns 400 unsupported_version.
2026-04-12, 2026-05-01 "2026-05-01"
Path Parameters
Response
Successful Response
The response is of type Response Canvasactionsreadsummary · object.