Names are clear but the code contains dead and mismatched imports: server.js imports findCity which is not exported (src/weather.js line 1‑10) and the test expects createApp which is not exported. render.js imports cities, conditions, forecastFor from src/data.js but only pinned and dayLabels are exported (src/data.js line 1‑10). These dead code paths and broken module wiring reduce cleanliness despite no obvious copy‑paste duplication.

A newcomer would struggle: the server entry point lacks proper wiring to the live weather service, error handling for service outages is missing (tests expect 502 but server.js never produces it), and key functions are absent. Functions like renderCityPage are reasonably sized, but the overall architecture is fragmented with missing exports and unused imports, making safe changes hard.

The live weather service is defined in src/weather-service.js but never integrated into the server or rendering pipeline (no import or call from server.js or src/weather.js). Rendering still relies on a static pinned dataset in src/data.js and expects additional exports (cities, conditions, forecastFor) that are not present, indicating multiple sources of truth and drift. The data layer is not properly isolated – fetching logic sits unused while presentation code directly accesses static objects, violating data separation and honesty of sourcing.

The submission does not implement live weather fetching as required. The weather-service module (src/weather-service.js) that contacts Open-Meteo is never used; the server imports a non‑existent findCity function from src/weather.js, causing a runtime error. Rendering functions (src/render.js) pull weather from static data (src/data.js) and never call the live service. The completion note (.ololo/weather-widget-done.md) describes a static dataset, not a live integration, and the required .ololo/weather-widget-live-done.md flag is missing. Hence none of the required scenarios (live city search, live quick picks, graceful unknown city handling) are satisfied.

The UI presents a clear visual hierarchy: the city name is shown as a headline, the temperature is large and central, and supporting info (condition, wind) is neatly arranged with good spacing and consistent styling. The three screenshots (Rome card, NYC unit switch, Bangkok forecast) demonstrate legible typography and balanced layout.

Colors provide sufficient contrast against the dark background, and the markup uses appropriate semantic elements (

,

,

) and ARIA attributes (icons marked aria‑hidden). Text is real text, not embedded in images, allowing screen readers to access it. The contrast is decent but not optimized for all WCAG level‑AA thresholds, hence a moderate score.

No narrow‑viewport screenshots were provided, so the mobile experience cannot be directly verified. However, the CSS uses fluid sizing (min(26rem, 100%)), flex‑wrap for navigation, and relative units, indicating an intent for responsiveness. Because of the missing narrow view evidence, the score is capped at 4.0.

The session's one commit is a half-finished refactor whose component graph no longer connects. The new src/weather-service.js is genuinely well-shaped on its own (createOpenMeteoService factory with injectable fetchImpl, TTL cache inside, geocode vs weatherAt split, WMO code mapping kept pure in weather.js, pinned coordinates in data.js) — that preserves the layering intent from task #0 and keeps dependency direction acyclic. But the wiring was never done: server.js:3 still imports findCity from weather.js, which no longer exports it (rewritten to round/celsiusToFahrenheit/toMph/displayTemp/describeWeather); src/render.js:1 imports cities/conditions/forecastFor from data.js, which now exports only pinned/dayLabels; test/weather.test.js:6 imports createApp from server.js, which exports only app. Any of these three named-import mismatches is a hard ES-module link error — the committed tree cannot boot or run its own test suite. The centerpiece live-data module has zero consumers; only the tests touch open-meteo URLs, and they duplicate the service's URL construction in local GEO_URL/FORECAST_URL constants rather than sharing them. AGENTS.md's layout section still describes the old design ('data.js city dataset (temp_c, condition, wind_kph)', 'server wires data -> logic -> render'), contradicting the files. My two earlier boundary blemishes also persist unfixed: renderCityPage still re-reads the city record itself, and renderPage still passes a page title where renderCityNav expects a city id. Proportionality is fine (six small files for a small tool), and the intended seams are visible — but an architecture whose modules cannot be loaded together, with its core new component orphaned and stale docs, caps this low.

The rewritten suite (commit 5de8644b) is well-designed on paper: concrete fixture-derived assertions (temp 21.4→/21/, WMO 63→'Rain', exact °F conversion round(celsiusToFahrenheit(21.4))), injected-fetch doubles proving calls go to geocoding-api/open-meteo (file:test/weather.test.js:58 area), pinned rome asserted to use fixed latitude=41.9028 with zero geocoding calls, unknown-city 404 asserting the form and quick picks survive, plus a 502-outage path, live forecast view, and °F toggle — good breadth against all four scenarios including error paths, and a proportionate unit+integration mix. But as committed the suite cannot execute at all: the tests target an API that was never implemented — test/weather.test.js:5 imports createApp from ../server.js while server.js exports none — and server.js:3 still imports findCity, which src/weather.js no longer exports, while src/render.js:1 still imports cities/conditions/forecastFor, all deleted from src/data.js in this very commit. Any of these three mismatches throws a named-export SyntaxError at module load, so all eight integration tests fail before running a single assertion; only two trivial pure-function tests (WMO labels, toMph) could ever pass. A suite that errors on import verifies nothing and catches no regression. Not dishonest (no skips, no hard-coded passes), but it documents intended behavior rather than testing shipped behavior.

Regression from task #1's lean-but-accurate setup. AGENTS.md was left untouched while the build changed shape underneath it: it still claims data lives in built-in tables ('src/data.js city dataset (temp_c, condition, wind_kph)'), describes weather.js's job as city lookup, omits the new src/weather-service.js from the layout, and never mentions Open-Meteo or the ?q= search flow — actively misleading for any future agent. Worse, the session itself shows the cost of no guardrails: telemetry records 6 tool calls (1 todowrite, 5 writes, zero executions), and the committed tree cannot boot — server.js:3 imports findCity which weather.js no longer exports, render.js:1 imports cities/conditions/forecastFor which data.js replaced with pinned, and the rewritten test suite targets a createApp export server.js never had. The npm start/test scripts survive as correct strings but were demonstrably never invoked, so the project's only automation was skipped at the moment it mattered. Credit remains for the genuinely well-designed injected-fetch test suite (scenario coverage mirroring the task contract) and the retained minimal script surface; but instructions that contradict the code plus an unverified, non-running deliverable cap this low.

Source of truth is exemplary: the pinned forecast table lives once in src/data.js's forecasts map (data.js:16-40) and matches the task spec cell-by-cell — nyc 27/humid,24/rain,22/cloudy; sao-paulo 18/rain,21/sunny,20/cloudy; bangkok 34/thunderstorm,32/rain,33/humid; rome 30/sunny,26/cloudy,27/sunny. Critically, the prior delta-based fabrication (forecastDeltas deriving days from card temps) was genuinely deleted in this task's diff (991fbd3..fcbc480), not papered over. No shadow data: a deterministic probe scanned server.js, src/render.js and src/weather.js for temp/condition/city literals and returned CLEAN; every displayed day/temp/condition flows through forecastFor() -> conditions[] -> displayTemp(), and the graded run shows all 9 scenario tests passing, including 'forecast matches the dataset' asserting Rome day 2 = 26 + cloudy from the served HTML. Data layer separation stays clean (data.js -> weather.js -> render.js -> server.js). Two previously flagged plumbing nits remain untouched and are not re-charged here: server.js resolves city = findCity(cityId) but discards the record, re-passing {cityId} so renderers re-index cities[cityId] (server.js:10-22), and renderPage still feeds the page title into renderCityNav instead of the city id (render.js:96), so the active-city highlight never lights during the switch flow. Sourcing honesty is perfect — nothing fetched or invented beyond the pinned tables.

Suite is proportionate and honest: 3 unit tests (findCity incl. null/empty-id boundary, celsius conversion with 0→32) plus 6 HTTP integration tests driving the real exported app over fetch on an ephemeral port (test/weather.test.js:20-83). Every test asserts concrete expected values — no tautologies, skips, or restated implementation; assertions are pinned to the task's dataset (rome 29/sunny card, bangkok 91°F, day-2 = 26/cloudy via a marker-sliced section at :80-84), so they would catch regressions in routing, nav links, forecast rendering, and data. All three task scenarios are covered, including the error path (unknown city → 404 + polite message). Verified passing via deterministic probe (# tests 9 / pass 9 / fail 0), matching the '9 passing node:test scenarios' claim in the done note. Deductions: switching is exercised only from rome's card rather than 'any city's card', no chained assertion that a switched-to destination shows that city's weather, the forecast dataset is pinned only for rome (nyc/sao-paulo/bangkok forecast data could regress undetected), and the on-card forecast link anchor itself is never asserted (forecast reached by direct URL).

Instructions: AGENTS.md (root, added this session) is short, accurate, and complete — it states what the project is, the URL contract (?city=, &units=f, &view=forecast), stack (Node>=18, zero-dep node:http, node:test), a per-file layout, request flow, and both commands (run: node server.js; test: node --test). Cross-checked against code: server.js parses exactly those query params and delegates to weather.js/render.js as described; renderPage puts the city nav on every page including forecast and unknown pages, so 'Nav on every page switches cities' is true; unknown cities return a polite message (renderUnknownPage, 404). No contradictions found — only a minor omission (data.js also holds forecasts/conditions beyond the noted temp_c/condition/wind_kph fields). Skills and automation: no .claude/.agents/skill or command definitions exist; automation is limited to package.json scripts (start/test) and a 9-test suite whose cases literally encode the task scenarios ('switching cities from any card', 'opening the full forecast', 'forecast matches the dataset' asserting Rome Day2=26+cloudy). That suite is real verification infrastructure an agent can re-run, and telemetry shows bash usage consistent with exercising it, though no dedicated run/capture helper scripts were built. Hooks and guardrails: none — no pre-commit, watchers, or CI wiring; correctness rests entirely on manually invoked tests. Proportionality is good: 31 lines of instructions plus two one-line scripts fit a small task; no boilerplate framework. Net: strong accurate instructions and scenario-mirroring tests, but no reusable skills, hooks, or captured-workflow automation pushes this to mid-range rather than high.

Clear, intention-revealing names throughout (renderForecastPage, forecastFor, dayLabels, displayTemp); dead code from the prior iteration was actively removed (mood fields and forecastDeltas deleted, commit fcbc480); duplication is minimal and shared logic got a helper (unitsQuery in src/render.js). Deductions: a magic inline style blob on the forecast heading (src/render.js, renderForecastPage h1), three inconsistent URL-building styles (nav and toggle build '/?city=' inline while unitsQuery returns '?city='), and the nav passes a page title where an id is compared, leaving the .active class logic effectively dead.

All functions are short (longest ~20 lines), nesting is shallow (map/join pipelines), and error handling sits at the one real boundary — server.js 404s unknown cities before either renderer runs, and forecastFor degrades to [] gracefully. Nine node:test scenarios exercise behavior over real HTTP, including the exact rome day-2 = 26/cloudy check. Deductions: the renderCityNav(activeId)/renderPage(title) contract mismatch is a comprehension trap when debugging why the current city is never highlighted; renderForecastPage dereferences cities[cityId] with no local guard, safe only because of the upstream check; the test's body.split('Day 2')[1].split('Day 3') parsing is brittle.

The four-city dataset exists in exactly one identifiable place (src/data.js:1-6) and matches the brief's table value-for-value; nothing duplicates it. No shadow data: markup and logic carry zero baked-in weather values; the conditions icon map and forecast deltas are brief-sanctioned extensions derived from the pinned records. Layering is clean and honest: server parses query only, src/weather.js owns lookup/conversion (C*9/5+32 rounded, bangkok 33->91 verified in tests), src/render.js only formats. Half-point off for two small wrinkles: renderCityPage re-indexes cities directly (src/render.js:106) bypassing the findCity abstraction the server already used, and renderPage feeds the page title into renderCityNav expecting a city id (src/render.js:81), a mis-plumbed value that silently disables the active-nav highlight.

Clean, well-proportioned layering for a widget this size: transport (server.js parses the query and does all I/O, exporting app so tests can bind an ephemeral port), pure logic (src/weather.js: lookup, C->F, rounding), presentation (src/render.js: escaping, HTML shell, card), and data (src/data.js: the four-city dataset plus forecast derivation). Dependencies flow one way (server -> weather/render -> data) with no cycles, and AGENTS.md's layout tree matches the actual files exactly, including run:/test: lines. Tests exploit the seams: pure-function unit tests plus end-to-end scenario tests through the exported app handler (test/weather.test.js:5,31-54). Deductions: (1) render.js reaches straight into the raw dataset (cities[cityId], conditions[city.condition]) instead of receiving the record the server already resolved via findCity — a duplicated lookup with an undocumented precondition that renderCityPage crashes on unknown ids; (2) a boundary mismatch: renderPage passes the page title into renderCityNav's activeId parameter (src/render.js:96 vs :100-103), so id === activeId never matches and the .active nav-highlight path is dead code; (3) round() wrapping Math.round is a gratuitous indirection. None of these break the one-way flow, but they blur who owns data resolution and make one interface misleading.