# Requirements: Mokosh

**Defined:** 2026-05-15
**Core Value:** When an operator hits a bug, one click produces a self-contained
archive that lets support reproduce what happened — in under 5 s, no server, no
password leaks.

All requirements below are extracted from the SPEC `Тз расширение фаза1.md`.
The intel files `.planning/intel/requirements.md`, `.planning/intel/constraints.md`,
and `.planning/intel/decisions.md` carry the verbatim wording, source citations,
and technical bindings; this file is the GSD-shaped projection of those facts.

## v1 Requirements

Requirements for the Phase 1 SPEC. Each maps to one phase in ROADMAP.md.

### Video

- [x] **REQ-video-ring-buffer**: The extension maintains an in-memory ring
  buffer containing the most recent 30 seconds of captured video. AMENDED in
  Phase 01: video is acquired via `navigator.mediaDevices.getDisplayMedia()`
  invoked from the offscreen document (with `chrome.offscreen.Reason.DISPLAY_MEDIA`),
  NOT `chrome.tabCapture` as originally specified. The captured stream is
  screen-or-window-scoped per the operator's one-time selection in Chrome's
  native picker, and continues unchanged across tab switches. Encoding is
  `video/webm; codecs=vp9` @ 400 000 bps. Ring-buffer mechanism FURTHER
  AMENDED in Phase 01 fix-a3 (debug session webm-playback-freeze, resolved
  2026-05-15): the original D-09..D-11 single-continuous-`MediaRecorder` +
  age-trim approach was retired in favor of D-13 restart-segments — the
  recorder stop()/start()s every 10 s on the same `MediaStream`, keeping
  the last 3 self-contained ~10 s WebM segments (3 × 10 s = 30 s window).
  Each segment carries its own EBML header + seed VP9 keyframe and is
  independently decodable, eliminating the orphan-P-frame freeze observed
  with the trim approach. Bindings: DEC-003 (AMENDED), DEC-009,
  CON-video-window, CON-video-codec, CON-display-capture-binding (replaces
  RETIRED CON-tab-capture-binding). CON-webm-header-retention RETIRED in
  favor of D-13 per-segment header isolation.
  - SPEC §10 acceptance criteria: #2, #3 — green 2026-05-15 (D-12 ffprobe
    gate). #7 (last_30sec.webm plays back in a browser) — **REOPENED
    2026-05-16**: D-13's concat-of-self-contained-segments architecture
    produces a multi-EBML-header file that standards-compliant Matroska
    parsers (mpv, ffmpeg, Chrome's HTMLMediaElement) play only as the
    first segment (~9.94 s) and silently drop segments 2 and 3. The
    2026-05-15 "operator-confirmed clean Chrome playback" assessment was
    insufficient — it checked playback ran without freezing but did not
    measure total duration. Plan 01-08 (WebM remux via ts-ebml +
    webm-muxer) will replace `mergeVideoSegments`'s file-concat with a
    real single-EBML-headered remux, restoring SPEC §10 #7. See
    `.planning/debug/d13-multi-ebml-concat-unplayable.md` for the
    byte-level root-cause evidence.

### DOM Capture

- [x] **REQ-rrweb-dom-buffer**: The extension records DOM events via rrweb
  (`rrweb.record()`) running in the Content Script over a rolling 10-minute
  window, capped at 5 000 events (oldest dropped on overflow). Sensitive
  fields are masked via rrweb v2 `maskInputFn` covering `input[type=password]`
  and `[data-sensitive="true"]`. Bindings: DEC-004, CON-rrweb-window,
  CON-sensitive-data-masking.
  - SPEC §10 acceptance criteria: #4.
  COMPLETED Phase 3 (2026-05-20): Plan 03-01 ships A29 — UAT harness empirical
  verification that rrweb's `record()` (wired at src/content/index.ts:285) emits
  Meta + FullSnapshot + IncrementalSnapshot EventType-enum members on a synthetic
  probe page (form + table + modal). 4 EventType checks GREEN; rrweb/session.json
  from the assembled archive contains > 0 events. Probe HTML in
  tests/uat/extension-page-harness.html (NO textarea per rrweb 2.0.0-alpha.4
  issue #1596). A29 GREEN: cc13f31. UAT harness 33/33 GREEN. T5 override applied
  per saved memory feedback-trust-harness-over-manual-uat.md (harness coverage
  canonical for SPEC §10 #4; operator UAT retired by explicit delegation).
  VERIFICATION at .planning/phases/03-spec-10-smoke-verification-dom-event-log-verification/03-VERIFICATION.md.

### Event Logging

- [x] **REQ-user-event-log**: The extension logs user and runtime events over
  a rolling 10-minute window. Captured types: `click` (records target selector
  and element text), `input` (excludes password fields), `navigation`
  (`popstate`, `hashchange`, page transitions), `js_error` (`window.onerror`,
  `window.onunhandledrejection`), `network_error` (`fetch` / `XMLHttpRequest`
  with response code >= 400). Each entry conforms to the verbatim
  `CON-event-log-schema`. Bindings: CON-event-log-window, CON-event-log-schema,
  CON-sensitive-data-masking.
  - SPEC §10 acceptance criteria: #5, #8.
  COMPLETED Phase 3 (2026-05-20): Plan 03-02 ships A30 — UAT harness empirical
  verification of all 5 UserEvent.type literal values (click, input, navigation,
  js_error, network_error) via synthetic triggers injected through
  chrome.scripting.executeScript ISOLATED-world into the content-script realm
  on a fresh https://example.com probe tab (cs-injection-world pattern; works
  around chrome-extension://-no-content-script per Chrome match-pattern spec).
  6-check A30 GREEN (1 SAVE ack + 1 entry-present + 5 type-presence checks);
  logs/events.json from the assembled archive contains at least one entry of
  each type. A30 GREEN: 116432a. UAT harness 33/33 GREEN. T5 override applied
  per saved memory feedback-trust-harness-over-manual-uat.md (harness coverage
  canonical for SPEC §10 #5; operator UAT retired by explicit delegation).
  §10 #8 (password-filter) covered by Plan 03-03 A31 (PARTIAL per D-P3-02
  charter — REQ-password-confidentiality remains Out of Scope v1).
  VERIFICATION at .planning/phases/03-spec-10-smoke-verification-dom-event-log-verification/03-VERIFICATION.md.

### Export

- [x] **REQ-screenshot-on-export**: On "Save archive" click, the extension
  captures a PNG screenshot of the active tab via
  `chrome.tabs.captureVisibleTab()` and includes it as `screenshot.png` in the
  archive. Binding: DEC-008.
  COMPLETED Phase 2 (2026-05-20): `captureScreenshot()` in src/background/index.ts
  invoked at SAVE entry; archive layout A28 set-equality verifies `screenshot.png`
  presence in the zip (UAT harness 29/29 GREEN). Shipped in Phase 1 via Plan
  01-09 SAVE flow; Phase 2 closure verifies layout contract.

- [x] **REQ-popup-ui**: The extension exposes a minimal popup with a single
  button labeled "Сохранить отчёт об ошибке" and a sub-label "Последние 30 сек
  видео + 10 мин лога". Button state machine:
  `idle → "Сохраняю..." → "Готово! ✓" → idle` (3 s revert). On click:
  (1) capture screenshot, (2) request video buffer + event log from SW,
  (3) request rrweb snapshots from Content Script, (4) assemble archive,
  (5) trigger download, (6) display "Готово! ✓". Russian strings are part of
  the contract and preserved verbatim.
  COMPLETED Phase 2 (2026-05-20): SAVE-only popup state machine shipped end-to-end
  via Plan 01-09 (state machine + Russian i18n strings via chrome.i18n.getMessage
  with `|| <en-const>` fallback per Plan 01-12 pattern). Phase 2 verifies the
  end-to-end SAVE → assembly → Blob URL download path via UAT harness A24 + A25
  (Puppeteer-driven). 171/171 vitest GREEN.

- [x] **REQ-archive-layout**: The archive is named
  `session_report_YYYY-MM-DD_HH-MM-SS.zip` and contains exactly:
  ```
  session_report_2025-05-15_14-32-10.zip
  ├── video/
  │   └── last_30sec.webm
  ├── rrweb/
  │   └── session.json
  ├── logs/
  │   └── events.json
  ├── screenshot.png
  └── meta.json
  ```
  Binding: CON-archive-layout.
  - SPEC §10 acceptance criteria: #7.
  COMPLETED Phase 2 (2026-05-20): archive assembly shipped Phase 1 via Plan 01-08
  (webm-remux + JSZip); Phase 2 verifies the 5-entry layout via UAT harness A28
  set-equality (jszip-parsed; not order-dependent). 29/29 UAT GREEN.

- [x] **REQ-meta-json-schema**: `meta.json` inside the archive conforms to the
  verbatim schema (D-P2-02 + D-P2-03 cutover; replaces the 7-field
  `url: string` shape per audit P1 #10 amendment 2026-05-20):
  ```json
  {
    "schemaVersion": "2",
    "timestamp": "2025-05-15T14:32:10Z",
    "urls": ["https://example.com/", "https://app.example.com/dashboard"],
    "userAgent": "Chrome/...",
    "extensionVersion": "1.0.0",
    "videoBufferSeconds": 30,
    "logDurationMinutes": 10,
    "totalEvents": 143
  }
  ```
  All 8 fields required. Acceptance:
  - `schemaVersion === '2'` (marks the D-P2-02 url→urls cutover; future
    schema bumps increment)
  - `timestamp` ISO-8601 with `Z` suffix
  - `urls` is a `string[]` whose entries each match
    `/^(https?|chrome-extension):\/\//` (per CONTEXT.md `<specifics>`
    filter rules — exclude chrome://, about:, devtools://, file://). Empty
    array IS permitted per F2 (whole-desktop-no-tab session is a
    meaningful operator state); non-empty arrays validate each entry.
  - `urls` is deduplicated; ordering is first-seen-first across the
    rolling recording window
  - `extensionVersion` matches semver
  - `totalEvents` is a non-negative integer
  - exactly 8 keys; no extras
  Binding: CON-meta-json-schema (this REQ-text supersedes the original
  CON-meta-json-schema 7-field shape — the original is preserved in the
  SPEC for provenance; this REQ documents the Phase 2 cutover).
  COMPLETED Phase 2 (2026-05-20): SessionMetadata in src/shared/types.ts has the
  8-field shape with `urls: string[]` + `schemaVersion: string` (no `url` field);
  src/background/tab-url-tracker.ts (246 LOC) dedupes/filters tab URLs with first-seen
  ordering; createArchive in src/background/index.ts emits all 8 fields with
  `schemaVersion: '2'`. Verified by UAT harness A26 (8-field strict) + A27 (multi-tab
  urls[] strict mode with tabs permission) + tests/build/strict-meta-json-validation.test.ts
  (8 tests) + tests/background/meta-json-urls-schema.test.ts (5 tests).

### Manifest & Install

- [x] **REQ-manifest-permissions**: `manifest.json` declares exactly the
  permission set in DEC-011 + Amendment 1 (`desktopCapture` per D-01,
  `activeTab`, `tabs` per Amendment 1, `downloads`, `scripting`, `storage`,
  `offscreen`, `notifications`; `host_permissions: ["<all_urls>"]`) and requests
  a user gesture for `desktopCapture` via getDisplayMedia on activation.
  Binding: DEC-011 + Amendment 1 (added `tabs` per Phase 2 D-P2-02 meta.urls
  requirement 2026-05-20), CON-manifest-permissions.
  Phase 2 verification (2026-05-20): manifest.json permissions array intact incl.
  `tabs` entry (tests/i18n/manifest-i18n.test.ts pin); permissions validation passes
  in pre-checkpoint bundle gates (5/5 PASS).
  COMPLETED Phase 1 Plan 01-12 (2026-05-20): manifest:name + :description +
  :action.default_title migrated to `__MSG_*__` placeholders + default_locale='en';
  manifest validation PASS in pre-checkpoint bundle gates (`tests/i18n/manifest-i18n.test.ts`
  shape + `tests/i18n/locale-parity.test.ts` en↔ru parity); permissions baseline
  UNCHANGED (Plan 01-12 added ZERO new permissions). Operator brand-fit ack 2026-05-20.
  - SPEC §10 acceptance criteria: #1.

- [x] **REQ-install-clean**: The extension installs in Chrome without errors
  via the unpacked-extension load flow. COMPLETED Phase 1 Plan 01-12 (2026-05-20):
  fresh `npm run build` produces clean dist/; load unpacked into Chrome shows
  manifest:name "Mokosh — Session Capture" (EN) or "Mokosh — Запись сессии" (RU)
  with no permission warnings, no remote-font CSP errors (0 `googleapis` /
  0 `https://fonts` in dist/ verified by `tests/build/no-remote-fonts.test.ts`),
  branded Loom-mark icons rendering at 16/48/128 sizes (8-bit RGBA), and
  16 i18n keys per locale with en↔ru parity. Operator brand-fit ack 2026-05-20
  "all good" on the empirical load.
  - SPEC §10 acceptance criteria: #1.

### Performance & Security

- [x] **REQ-archive-export-latency**: From the moment the user clicks the
  export button, the ZIP archive lands in the "Downloads" folder in under
  5 seconds. Binding: CON-archive-export-latency.
  - SPEC §10 acceptance criteria: #6.
  COMPLETED Phase 2 (2026-05-20): Plan 02-02 migrated download from base64 data:
  URL (which exceeded Chrome's ~2 MB data-URL cap for real payloads) to
  offscreen-minted Blob URL (`blob:chrome-extension://...`) via
  `URL.createObjectURL` per D-P2-01 (closes audit P0-6). chrome.downloads.onChanged
  listener revokes the URL on state.current==='complete' | 'interrupted'.
  Verified empirically by UAT harness A25 — Puppeteer-driven real-Chrome <5s
  SAVE→zip latency assertion (29/29 UAT GREEN).

- [ ] **REQ-password-confidentiality**: Passwords do not appear in rrweb
  snapshots OR the user event log. Masking is enforced via rrweb v2
  `maskInputFn` AND explicit value filtering in the event logger for password
  fields. Binding: CON-sensitive-data-masking.
  - SPEC §10 acceptance criteria: #8.

## v2 Requirements

Deferred to a future phase per SPEC §9 ("Что НЕ входит в Фазу 1"). Tracked
but not in current roadmap.

### Server & Diagnostics

- **SRV-01**: Upload captured archives to a remote server.
- **SRV-02**: AI-driven diagnostics of captured sessions.
- **SRV-03**: Automatic ticket creation from captured reports.
- **SRV-04**: Analytics dashboard summarising captured sessions.

### Capture

- **CAP-01**: Audio recording in addition to video.

## Out of Scope

Explicitly excluded in Phase 1. Documented to prevent scope creep.

| Feature | Reason |
|---------|--------|
| Server upload | SPEC §9 — Phase 2 work. Phase 1 is local-only via `chrome.downloads`. |
| AI diagnostics | SPEC §9 — Phase 2 work. |
| Automatic ticketing | SPEC §9 — Phase 2 work. |
| Analytics dashboard | SPEC §9 — Phase 2 work. |
| Audio recording | SPEC §9 — Phase 2 work. |
| `chrome.storage` / IndexedDB persistence of rolling buffers | CON-buffer-storage — buffers are in-memory only in Phase 1. |
| Recording inactive tabs | CON-tab-capture-binding — `chrome.tabCapture` is active-tab-bound by design. |

## Phase 1 Acceptance Criteria (SPEC §10 verbatim)

For traceability, all SPEC §10 acceptance criteria are listed once here, each
cross-referenced to its supporting REQ-* entries. The developer-facing success
metric for the whole project is "all 9 pass".

1. The extension installs in Chrome without errors. → REQ-install-clean,
   REQ-manifest-permissions
2. The video buffer runs continuously on any tab. → REQ-video-ring-buffer
3. The buffer always contains no more than 30 seconds of video. →
   REQ-video-ring-buffer
4. rrweb records DOM events without errors on typical pages (forms, tables,
   modal windows). → REQ-rrweb-dom-buffer
5. The event log captures clicks, navigation, and network errors. →
   REQ-user-event-log
6. On button press, the archive is downloaded to "Downloads" in < 5 seconds. →
   REQ-archive-export-latency
7. The archive opens; `last_30sec.webm` plays back in a browser. →
   REQ-archive-layout, REQ-video-ring-buffer
8. Passwords do not appear in the log or rrweb snapshots. →
   REQ-password-confidentiality
9. Extension RAM consumption does not exceed 50 MB in the background. →
   CON-ram-ceiling (NFR, not a functional REQ).

## Traceability

Which phase covers which requirement. See ROADMAP.md for phase details.

| Requirement | Phase | Status |
|-------------|-------|--------|
| REQ-video-ring-buffer | Phase 1 | Complete 2026-05-20 (Plans 01-08 WebM remux + 01-14 monitorTypeSurfaces; verified via gsd-verifier audit; fixture `tests/fixtures/last_30sec.webm` ffprobe + ffmpeg dry-run GREEN; Chrome playback confirmed) |
| REQ-rrweb-dom-buffer | Phase 2 (originally) → **Phase 3** (post-2026-05-20 re-phasing) | Complete 2026-05-20 (Phase 3 Plan 03-01 A29 GREEN — 4 EventType-enum checks against rrweb/session.json from probe-HTML-driven archive; UAT harness 33/33 GREEN; T5 override per saved memory feedback-trust-harness-over-manual-uat.md) |
| REQ-user-event-log | Phase 2 (originally) → **Phase 3** (post-2026-05-20 re-phasing) | Complete 2026-05-20 (Phase 3 Plan 03-02 A30 GREEN — 5 UserEvent.type presence checks against logs/events.json via cs-injection-world pattern; UAT harness 33/33 GREEN; T5 override per saved memory feedback-trust-harness-over-manual-uat.md) |
| REQ-password-confidentiality | Phase 2 (originally) → **Out of Scope (v1)** | DEFERRED per 2026-05-20 charter shift ("we don't care about privacy hardening. At least here.") — archive flow is internal-only (no external transmission); P0-5 password masking re-classified as Phase 4 optional hardening or v2 work |
| REQ-popup-ui | Phase 3 (originally) → **Phase 2** (renumbered) | Pending (largely shipped via Plan 01-09 SAVE-only popup + Plan 01-12 i18n; residual gaps in Phase 2) |
| REQ-screenshot-on-export | Phase 3 (originally) → **Phase 2** (renumbered) | Pending |
| REQ-archive-layout | Phase 3 (originally) → **Phase 2** (renumbered) | Pending (substantively shipped via Plans 01-08 webm-remux + JSZip; verification in Phase 2) |
| REQ-meta-json-schema | Phase 2 | Pending (implementation landed via Plan 02-03; harness validation deferred to Plan 02-04) |
| REQ-archive-export-latency | Phase 3 (originally) → **Phase 2** (renumbered) | Pending |
| REQ-manifest-permissions | Phase 3 (originally) → Phase 1 closure via Plan 01-12 i18n migration | Complete (2026-05-20 — manifest __MSG_*__ + default_locale='en' + 16 i18n keys per locale; permissions DEC-011 baseline unchanged; operator brand-fit ack) |
| REQ-install-clean | Phase 4 (originally) → Phase 1 closure via Plan 01-12 design integration | Complete (2026-05-20 — fresh build + load unpacked clean; zero remote-font CSP errors; branded icons rendering; en+ru manifest:name resolution; operator brand-fit ack) |

**Coverage:**
- v1 requirements: 11 total
- Mapped to phases: 10 (REQ-password-confidentiality deferred to Out of Scope v1 per 2026-05-20)
- Unmapped: 0 ✓
- Out of Scope: 1 (REQ-password-confidentiality)

**2026-05-20 re-phasing note:** Original Phase 2 ("Stabilize DOM + event-capture
privacy") REMOVED entirely. REQ-rrweb-dom-buffer + REQ-user-event-log
verification ABSORBED by new Phase 3 (SPEC §10 smoke + DOM/event-log). All
subsequent phases renumbered: old 3 → new 2, old 4 → new 3, old 5 → new 4.

Note on CON-ram-ceiling (SPEC §10 #9): tracked as a non-functional constraint
verified in Phase 4 (smoke verification) rather than as a standalone
functional REQ, per the intel synthesis. Phase 4 success criteria include the
RAM-ceiling check.

---
*Requirements defined: 2026-05-15*
*Updated 2026-05-20 — Phase 3 closed (REQ-rrweb-dom-buffer + REQ-user-event-log marked Complete via gsd-verifier Phase 3 aggregator; §10 #8 PARTIAL per D-P3-02 + A31 GREEN existing-minimum verification; §10 #9 awaits operator chrome://memory-internals per D-P3-04 + A32 informational scaffolding shipped; UAT harness 29 → 33 GREEN; T5 overrides applied for §10 #4/#5/#8 PARTIAL per saved memory feedback-trust-harness-over-manual-uat.md). VERIFICATION.md at .planning/phases/03-spec-10-smoke-verification-dom-event-log-verification/03-VERIFICATION.md.*
*Earlier update: 2026-05-20 — REQ-meta-json-schema amended for Plan 02-03 (D-P2-02 + D-P2-03 8-field cutover: `url: string` → `urls: string[]`; new `schemaVersion: "2"` field; F2 empty-array permission). Traceability table entry flipped to "Pending (implementation landed via Plan 02-03; harness validation deferred to Plan 02-04)".*
*Earlier update: 2026-05-20 — Plan 01-10 closure (welcome tab; first-install activation; canonical mark + canonical tokens + canonical chrome.i18n welcomeHero; 24/24 UAT GREEN; operator cycle-2 ack "All good"). Plan 01-10 introduced no new functional REQs; it consumed REQ-video-ring-buffer (already Complete via Plan 01-07) by adding the first-install operator-facing activation surface that complements the always-on capture pipeline. Phase 1 final functional plan delivered; final-closure marker flip pending (REQUIREMENTS / ROADMAP / STATE markers + optional /gsd-verify-work 1).*
*Earlier update: 2026-05-20 — REQ-install-clean + REQ-manifest-permissions marked Complete on Plan 01-12 closure (design integration + manifest i18n + operator brand-fit ack)*
*Earlier update: 2026-05-15 — REQ-video-ring-buffer marked Complete on Phase 1 (Plan 01-07) closure*
