Plan 01-14 ships W3C Screen Capture monitorTypeSurfaces: 'include' (Chrome
119+) on the offscreen getDisplayMedia call, plus an A23 harness regression
assertion that verifies the constraint reaches the call site via the
existing offscreen-hooks bridge.
Scope: 1 source line + A23 wiring + Tier-1 grep gate inventory update
(lockstep extension of unit-gate + UAT A0 FORBIDDEN_HOOK_STRINGS).
Autonomous, single executor; no operator empirical checkpoint (UAT 16/16
harness coverage suffices per feedback-pre-checkpoint-bundle-gates.md).
Canonical sources:
- Plan 01-10 RESEARCH section 5 ('monitorTypeSurfaces: include' recommendation)
- Plan 01-10 RESEARCH section Pitfall-5 ('Misinterpreting displaySurface
as a hard constraint' — monitorTypeSurfaces is the picker-UI complement
to D-15's post-grant validation)
- W3C Screen Capture spec section 6.1 DisplayMediaStreamOptions
- developer.chrome.com/docs/web-platform/screen-sharing-controls
Decisions honored:
- D-01 (whole-desktop only via getDisplayMedia; reject window/tab) — the
new constraint is the picker-UI realization of D-01's intent.
- D-15 (post-grant displaySurface validation) — UNCHANGED; remains the
enforcement (this plan is belt-and-suspenders at the picker UI level).
Ceremony note: this plan replaces the prior AMENDMENT-A.md improvisation
path retired per 01-11-SUMMARY Architectural Notes. Canonical GSD ceremony
(plan -> checker -> executor -> SUMMARY).
Validations:
- gsd-sdk frontmatter.validate -> valid: true (8/8 required fields).
- gsd-sdk verify.plan-structure -> valid: true (1 task; hasFiles/hasAction
/hasVerify/hasDone all true).
- ROADMAP.md Phase 1 plans list extended with 01-14 entry.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Mark
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