[sqnico]

Why

People need to write a message now and deliver it later, including while Buzz is closed. The modern app has no composer scheduling flow or scheduled queue in Drafts & sent.

What

• Add a split Send button with Later today, Tomorrow, Monday, and Custom time choices, up to 120 days ahead.
• Add a calendar and editable time picker, an explicit time zone, and a confirmation with a link to scheduled messages. The draft clears only after durable acceptance.
• Put Scheduled inside the existing Drafts & sent page. Add edit, reschedule, send-now, save-to-drafts, and delete actions, plus a clock/count in the sidebar.
• Give Drafts, Scheduled, and Sent their own search labels and retained search text. Search matches message text and destination within the selected tab.

How

The existing message builder prepares formatting, mentions, uploaded attachments, and thread references. The host signs the exact future event and uses one fixed authenticated relay endpoint. A session-owned service verifies queued signatures and preserves revisions and retry IDs.

The sidebar and page share one queue read, subscription, and timer. Overdue messages and failed reads retry with bounded backoff. The UI reuses Dialog, Calendar, Combobox, Menu, SearchField, and the split-button recipe.

The first commit adds the service and host boundary; the second adds the composer and management UI. No standalone scheduling plugin is needed.

Risk and limitations

• Requires the companion relay change and its default-off capability. Older relays keep ordinary sending behavior. Enable the bundled Drafts & sent plugin to manage the queue.
• Drafts remain local to this device. Cross-device draft sync and recurring schedules are not included.
• Draft conversion supports text, formatting, mentions, and root-thread replies. It refuses attachments, nested reply parents, media targets, explicit model/effort settings, and unaddressed slash commands. The original stays scheduled when conversion is refused.
• Editing a queued message changes its text or time; its original destination, mention bindings, and attachment tags remain fixed.
• Attachment uploads must finish before scheduling. New uploads were not tested against object storage in the isolated manual environment.
• Server retries can deliver late; the message keeps its selected signed timestamp. No production deployment or activation is included.

Testing

The running modified macOS app was exercised against an isolated local HTTPS relay during UI iteration. The feature flow was checked in Chromium and WebKit. The final rebase added Pi/MCP and Windows OAuth changes without altering the feature patches; mandatory types, related tests, design guards, and native Clippy passed afterward. The author confirmed successful testing of the current build on November 10, 2026.

• pnpm exec playwright test --config tests/browser/playwright.config.mjs scheduled-messages.spec.mjs drafts-in-progress.spec.mjs --project chromium --project webkit --no-deps: representative flows pass in both engines, including refusal/retry, draft preservation/reload, cross-year layout at 100%/150%, Finnish time selection, queue edits, rescheduling, search, and save-to-drafts. Later focused reruns checked the locale fix and visible menu capture.
• BUZZ_SCHEDULED_TEST_RELAY=<isolated loopback relay> pnpm exec vitest run src/features/relay/scheduled-messages.live.test.ts: passed with verified local HTTPS; delivery completed after the scheduling session closed.
• An existing team-mentions status test now controls its directory-search debounce instead of racing a real timer under suite load. Assertions and timeouts are unchanged.
• Focused coverage checks signature/owner boundaries, stable retries, stale revisions, newer composer drafts, delayed queue refresh, tab isolation, and refusal of unsafe draft conversion. All mandatory pre-commit and pre-push checks passed without bypasses, including the related test suite, design guards, and native Clippy.
• Browser cases added: 5 scenarios per engine. They prove real picker focus/input behavior, rendered geometry, and composer/page wiring. State matrices stay in unit tests. A locale parsing probe reproduced the English-parser failure; canonical-time picker selections now pass in both engines; existing browser cases were retained.

Screenshots use fictional local fixtures and the actual shared UI components.

Schedule a message

Manage scheduled messages

Bigger picture

Companion relay: block/buzz#9323. Deploy its migration and reservation-aware probes with scheduling off before enabling delivery. Human acceptance is complete. Keep this PR in draft until hosted CI completes; its current run requires maintainer approval: https://github.com/block/buzz-app/actions/runs/42857875690.

Readiness checklist: buzz-review-completed (agent review, agent exercise, and human testing complete; hosted CI remains pending).

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