# M16-GAP-00221 Status

status: done
task: armature.collection_add operator LOCAL_EXACT slice
updated: 2026-08-22 America/New_York

scope:

- The minimal fixture contains one armature bone assigned to `WebGapArmatureCollectionAddExisting`.
- Desktop runs `ARMATURE_OT_collection_add` with `poll=true` and `FINISHED`, creating the `Bones` collection as index 1 and preserving the existing bone membership through save/reopen.
- The existing Main reader exposes both bone collections and their member IDs; no new reader field, data-block, editor, or browser behavior was added.

evidence:

- The generator, desktop checker, npm comparator, direct comparator, and task-context checks passed. Repeated checker runs recognize the persisted collection and remain idempotent.
- WASM/Main observes the same collection names, indices, and memberships, preserves them across save/reopen, and rejects malformed Blend input without Main mutation.
- Chromium-only policy was preserved; no Firefox/WebKit run was made.

nextTask: `M16-GAP-00222`