T65STA

The implementation uses Open-Meteo geocoding and forecast endpoints as the actual source of truth, including live current temperature, weather code translated to human-readable conditions, wind, humidity, forecast data, unit-specific requests, and a five-minute cache (commit:609abe572b4318ffafaf1ce82cd2cbdfb941d4b5; file:live-weather.js:1-148). Quick picks map to city names and also call the same live service rather than built-in weather tables (file:live-weather.js:1-10, file:live-weather.js:109-148). The server supports arbitrary city search, Celsius/Fahrenheit display and links, live service labeling, polite unknown-city handling, service-error handling, and usable search/quick-pick controls (file:server.js:240-415). The completion note is present, exceeds ten words, and names Open-Meteo (commit:609abe572b4318ffafaf1ce82cd2cbdfb941d4b5; file:.ololo/weather-widget-live-done.md:1). Delivered screenshots show a polished, responsive card with an explicit “LIVE · OPEN-METEO” label, plausible Rome data, readable conditions, and matching °C controls (probe:f2e1ecba-79cb-4729-bee6-387941ce5e02). The available screencast evidence is weak: its sampled frames are essentially identical Rome states and do not visibly prove typing Berlin, live data appearing, or the unknown-city flow (probe:c068ae7b-3356-4022-9428-2e1b965d7c65). Automated tests cover typed-city rendering, quick picks, Fahrenheit conversion, unknown cities, forecast, partial navigation, upstream URL usage, and caching, but use fakes for the server scenarios (file:weather-widget.test.js:39-157). The main product risk is therefore not apparent code correctness but insufficient end-to-end visual proof and lack of visible verification that the real upstream service is reachable in the submitted flow.

The delivered desktop and mobile captures show a strong visual hierarchy: the city name, large temperature, condition icon/label, wind and humidity, unit controls, search, and quick picks are clearly separated in a cohesive dark card design. The live service is also visibly identified as Open-Meteo in the eyebrow label. Evidence: desktop screenshot artifact and mobile screenshot artifact; commit:609abe572b4318ffafaf1ce82cd2cbdfb941d4b5; file:server.js:366-389.

The screenshots show high contrast between the light text and dark surfaces, with conditions expressed as both icon and human-readable text rather than color alone. Markup includes lang="en", viewport metadata, semantic main, h1 headings, labeled city and units controls, and escaped dynamic text. The emoji weather icons are informative but lack an explicit textual alternative beyond the adjacent condition label. Evidence: screenshots; file:server.js:315-327, 343-353, 366-389.

The narrow screenshot shows the widget fitting within the viewport without visible horizontal overflow or overlap. The hero stacks vertically, stats become single-column, the search controls stack, and controls remain large and legible. The responsive media query directly supports these changes. Evidence: mobile screenshot artifact and file:server.js:266-274.

The weather source of truth is one identifiable place: the Open-Meteo geocoding + forecast APIs, hit only from live-weather.js (geocoding-api.open-meteo.com/v1/search and api.open-meteo.com/v1/forecast with temperature_unit driven by the °C/°F toggle). No shadow data: server.js renders exclusively fields from the data object returned by getData(), so no temperatures or conditions are redeclared in markup, templates, or logic; QUICK_PICKS holds only display names and WEATHER_CODES is a WMO-code-to-language translation for the live service's own codes, not a data copy. Data layer separation is clean: all fetching/shaping/caching lives behind createLiveWeather() with a getData(cityInput, units) interface, and presentation code never parses upstream payloads. Honesty of sourcing: displayName, temperature, condition, wind, humidity, and forecast are all derived from the live service response (geocode first result → forecast for that lat/lon); unknown cities return null and render the polite 'Cannot find that city' page, service failures render an honest unavailable page. The done note names Open-Meteo as required. Live network could not be re-verified from the judge sandbox (no outbound network), but the offline suite (9/9) passes and the screencast artifact weather-flow.webm covers the interactive flow.

A 9-test suite rewritten for this task that runs green (node --test: 9 pass, 0 fail, 0 skipped — verified by deterministic probe). All four task scenarios are covered with concrete assertions: typed city shows live values from the injected service rather than a built-in table (asserts 'Berlin, Testland', 42°C, 'partly cloudy', and the FakeMeteo source label — a regression to hardcoded tables would fail), quick picks go live (nyc renders service values), unknown city fails politely and stays usable (atlantis → 'Cannot find that city' + search form + chips still present), and honest data (units match the toggle: 42°C vs 108°F, 17 kph vs 11 mph; human-readable condition). Error paths are covered too: weather-service failure renders an honest error page, and a client-level unit test exercises the geocoding→forecast flow, WMO weather-code mapping, and caching (second call hits the forecast endpoint only once). Level mix is proportionate: HTTP-level integration tests through the real server with an injected fake backend, plus one unit test of live-weather.js with a stubbed fetch — the assembled product is exercised, with only the real upstream network deliberately faked. Honest: no skips, todos, commented-out or hard-coded-to-pass tests; assertions target rendered behavior, not implementation. Minor gaps keep it from higher: the °F path and the geocode-empty→null path are only tested at the server layer via the stubbed backend, not in the live-weather client unit test, and the in-browser typing/partial-fetch interaction is verified only via the screencast artifact rather than an automated browser test — acceptable for task size.

Clean three-way split of concerns for a plain-Node server-rendered widget. Data access is isolated in live-weather.js: a factory (createLiveWeather) with injectable fetchImpl/cacheMs/sourceName wraps the Open-Meteo geocoding + forecast calls, owns the 5-minute in-memory cache keyed by (city, units), and exposes a single getData(city, units) contract that returns null for unknown cities and throws for upstream failures. WEATHER_CODES is a WMO code→label/icon mapping, clearly not a built-in weather table — the source of truth is the live API (also labeled in the UI eyebrow as 'live · Open-Meteo'). Presentation is separated into pure HTML-rendering functions in server.js (cardInner, forecastInner, unknownInner, serviceErrorInner, allInner) with centralized escapeHtml on all user/service-derived strings; orchestration lives in a single pageFor() that normalizes units, calls getData, and dispatches to the right renderer for data/null/error states. Dependency direction flows one way: server.js depends on the injected weather client (createServer({ weather })), live-weather.js depends only on global fetch and its own constants — no circularity. The DI seams make both layers testable in isolation, and weather-widget.test.js exercises exactly that: a fakeWeather for the server and a fakeFetch asserting cache behavior and upstream URLs. Minor blemishes keep this from a 10: server.js is one 480-line file bundling CSS, templates, and routing (proportionate for a no-framework app but not further decomposed), the Node 18+ globalThis.fetch requirement is undocumented, and the cache has no concurrent-request stampede protection. Overall a proportionate, single-purpose, easily replaceable structure.

No agent configuration exists anywhere in the snapshot: no AGENTS.md, README, package.json scripts, Makefile, CI, hooks, or skill definitions (file list is exactly three source files plus .ololo notes/artifacts; .ololo/settings.json only grants harness permissions, not instructions). The repository itself partially compensates: the layout is small and self-explanatory (server.js is the entry point, live-weather.js the Open-Meteo client, weather-widget.test.js the verifier), and the node:test suite is genuinely useful automation that was clearly used — it was rewritten in this task's commit to encode every acceptance scenario (typed city, quick picks live, units toggle, unknown-city politeness, service-failure fallback, upstream cache behavior) and is runnable without any wiring. The done note names the chosen service (Open-Meteo) and describes behavior. But nothing documents how to run or verify the app ('node server.js' / 'node --test' are nowhere written down), no routine is encoded beyond the tests, and there are no hooks or guardrails — a next agent would have to rediscover the run/check commands by inspection.

Beyond the core live weather requirement, the build adds a useful three-day live forecast view, five-minute in-memory caching, client-side city switching without address-bar changes, humidity and wind details, unit-aware wind conversions, service attribution, and distinct unknown-city/service-unavailable recovery states. These are relevant, working product touches rather than decorative scope. Evidence includes the delivered weather-flow screencast and implementation in live-weather.js and server.js.

The delivered desktop and mobile screenshots show a cohesive dark weather widget with strong hierarchy: city name, temperature, condition, city-switching cards, and clear forecast action. The layout is polished and readable, though the provided stills do not show the forecast screen itself. Evidence: desktop screenshot shows the Rome card and visible city controls; server.js:296-310 defines the forecast action and structured forecast rendering.

The screenshot shows strong light-on-dark contrast, real readable text, and non-color condition indicators using both emoji and labels. Markup includes lang="en", viewport metadata, headings, and text labels. The interactive controls are rendered as links with descriptive text. Evidence: server.js:219-228, 241-247, 285-310.

The narrow screenshot shows a single-column layout without visible overlap or truncation; city cards, stats, and controls remain legible and comfortably spaced. The responsive CSS explicitly collapses the hero, stats, and forecast grid under 520px. Evidence: mobile screenshot and server.js:137-142.

Beyond the requested city switching and forecast views, the widget adds client-side partial navigation so internal interactions do not reload the page or touch the address bar, plus a Celsius/Fahrenheit toggle preserved across cards and forecasts. It also includes an unknown-city error state and responsive mobile layout. These are relevant, functioning user-focused additions rather than gimmicks.

The pinned forecast dataset lives in exactly one identifiable place: the FORECAST object in weather-data.js:18-40, and it matches the task table cell-for-cell (nyc 27/24/22; sao-paulo 18/21/20; bangkok 34/32/33; rome 30/26/27 — including the scenario check rome day 2 = 26 cloudy). No second copy of these values exists anywhere: server.js renders the forecast by calling getForecast(city.key) (weather-data.js:52-56) inside forecastInner and interpolates item.day/temp/condition into the markup — no temperature or condition literal is baked into the templates, so there is no shadow data. The only out-of-module occurrences of dataset values are the assertions in weather-widget.test.js, which verify rather than ship data. Data-layer separation is clean: weather-data.js owns the data plus accessors (getCity, getForecast, normalizeCity, toFahrenheit, toMph) behind a clear module interface, while server.js only does HTTP and presentation (unit conversion goes through toFahrenheit, not hardcoded °F values). Minor honesty-of-sourcing note: the CITIES block (weather-data.js:1-7) carries per-city 'current' temps (nyc 26, sao-paulo 19, bangkok 33, rome 29) inherited from the prior task; these differ from this task's pinned day-1 forecast values (27/18/34/30) and are not derivable from the pinned forecast table. They are single-sourced in the same data module and never duplicated in markup, so they are not shadow data, but a strict 'pinned dataset is the only weather source' reading would flag the card's current temp as not derived from this task's dataset. Forecast output itself is fully derived from the pinned source.

Integration suite (node:test + fetch against a live server) that verifies concrete behavior against the pinned dataset, not just that code runs. It covers the dataset-matching scenario exactly (rome day 2 = 26°C cloudy, day 1 = 30 sunny, all three day labels), the full forecast with a back-to-card control, city-switch controls to every other city, the partial-mode contract that powers client-side switching, the unknown-city error path, and the Celsius/Fahrenheit boundary (bangkok forecast 93°F/90°F). Probe run confirms 10/10 tests pass with no skips. Minor gaps: the switch-control assertion /clientNav|widget/ would pass from id="widget" alone even if the fetch-nav script were absent; the partial-mode test only exercises the forecast view, never a city-card partial; forecast-vs-dataset matches are spot-checked only for rome and bangkok, not all four cities; and the live client-side switching flow is left to the screencast (reasonable per the task contract, but means the interactive nav JS itself is not directly asserted).

Naming is descriptive and consistent (cardInner/forecastInner/unknownInner/allInner/pageFor, cityUrl, unitToggle, otherCitiesRow). No dead code: every exported helper and constant (CITIES, CONDITIONS, FORECAST, getForecast) is consumed, and the refactor from renderCity/renderAll/renderUnknown to the *Inner/pageFor split removed the old layout-wrapping duplication. Only blemish is the city-card anchor template repeated nearly verbatim in cityCards and otherCitiesRow (server.js:316-327 vs 331-342, ~8 lines differing only by the active class) and the unit-toggle block reused in both views; a shared card helper would remove it, but this is small (well under the 10% duplication cap) and the duplication is structural HTML-template repetition rather than logic copy-paste. No analysis measurements (jscpd/lint) were present in the evidence, so duplication was judged by direct reading.

The server is cleanly factored into small single-purpose functions with shallow nesting; renderStyles is long but is a CSS template string, not logic. Boundaries are handled: unknown cities render a polite fallback (server.js:396-399, 424-427), the client nav fetch has a full-page-reload fallback on failure (server.js:267-272), and modifier-key/right-click clicks are excluded so default browser behavior is preserved. Data is single-sourced in weather-data.js and matches the pinned dataset exactly (rome day 2 = 26 cloudy). Newcomer safety is backed by a test suite covering switching controls, the three-day forecast, the back control, Fahrenheit conversion, and partial mode (weather-widget.test.js:54-94). Minor defects: the 'forecast' view is a magic string threaded through cityUrl/pageFor with no named constant, and partial-mode behavior is inferred from URL params rather than documented; neither blocks safe change. The one-shot document-level click listener with root.innerHTML replacement is a sound pattern that survives partial re-renders.

Clean three-file structure with well-defined layers. weather-data.js is a pure data/accessor module: the pinned CITIES/FORECAST/CONDITIONS datasets plus small pure helpers (normalizeCity, getCity, getForecast, toFahrenheit, toMph) — no I/O or markup. server.js owns HTTP + rendering, with pageFor() as a pure logic function returning {title, inner} and createServer() handling only HTTP concerns (partial mode, layout wrapping). Each view has its own single-purpose renderer (cardInner, forecastInner, unknownInner, allInner), and the client-side switching mechanism (clientNavScript + partial=1 fetch) is a small, well-contained unit decoupled from data. Dependencies flow one way (server -> data -> none), and tests exercise the running server. Right-sized for the task: no needless layering. Minor defects: HTML/CSS/client-JS co-located as template strings in server.js, and card markup duplicated between cityCards and otherCitiesRow — cosmetic at this scale, not structural. The forecast feature was added as a focused diff (FORECAST dataset, view=forecast route, back control, scenario-mirroring tests).

No agent configuration exists in the repo: no AGENTS.md, README, .claude/, .agents/, skills, commands, or hooks anywhere in the tree (full tree is server.js, weather-data.js, weather-widget.test.js, .ololo files). Agent telemetry confirms the session (opencode, 19 tool calls, 0 skills loaded) worked without repository-provided instructions. The repository partially compensates for the silence: the layout is self-explanatory (a plain Node http server at server.js, the dataset isolated in weather-data.js, and a node:test suite that encodes the project's verification routine — it covers exactly the task's scenarios: switchable city controls, three-day forecast, Rome day-2 = 26/cloudy, back navigation, and partial-mode fetching), and the test file was evidently used (7 bash calls in-session). But there is no documented run/verify command (no package.json/npm script/Makefile), no README, and no automated hooks or guardrails, so an agent inherits no instructions or ergonomics beyond reading the code itself.

The delivered desktop screenshot shows a polished, cohesive weather card with strong hierarchy: city title, oversized temperature, condition icon/label, wind and condition stats, unit controls, and other-city cards. The dark navy palette, blue accent, rounded panels, and generous spacing read as intentional and make the primary weather value immediately scannable. Evidence: the Rome desktop capture and server.js render structure/styles.

The screenshot provides strong light-on-dark contrast and does not rely solely on color: condition names, labels, temperatures, and units are all written as text. Markup includes lang="en", viewport metadata, semantic main content, headings, links, and escaped dynamic text. A minor limitation is that the weather emoji/icons are decorative text without an explicit accessible label, and the unit controls are links rather than a more explicit toggle group. Evidence: captures and server.js layout/rendering code.

The narrow screenshot shows the widget fitting cleanly within the viewport with no visible horizontal overflow or overlap. The hero stacks temperature and condition vertically, the stats become single-column cards, and the city cards stack into full-width touch-sized blocks. The media query and fluid width support this responsive behavior. Evidence: mobile capture and server.js responsive CSS.

No agent-facing configuration exists: no AGENTS.md, no .claude/.agents/skills, no package.json/Makefile/CI, no hooks or pre-commit checks — the repo is four files plus the required done-note and a sandbox permissions file (.ololo/settings.json:1 only allows cd . *). The player's session telemetry confirms the work was improvised (read/edit/write/bash) with only the platform's built-in 'reconnaissance' skill loaded, no authored skill or command definitions. What partially compensates is the repository itself: a clean modular layout (data in weather-data.js, rendering in server.js) and a genuinely useful, working self-check — weather-widget.test.js encodes the exact acceptance scenarios (rome 29°C/sunny, bangkok 91°F, atlantis → 'unknown city', plus Celsius-default and all-cities extras) and runs with a single command: a deterministic probe of node --test weather-widget.test.js passed 5/5. But the check is not wired anywhere (no npm script, no hook), there is no run/verify instruction for a future agent, and the whole submission landed in one commit (7174b5c). This sits at the top of the no-agent-configuration band, lifted only by the runnable test suite and self-explanatory layout.

Clear, consistent naming; data separated from rendering in weather-data.js; no dead code or unused exports. Minor duplication: the city-card markup block is repeated between cityCards and forecastRow (server.js:236 vs 249) and the eyebrow line is repeated in three render functions, but total duplicated content is a few lines of a ~400-line project, far below any cap threshold.

Small pure render functions, shallow nesting, conversion math extracted to named helpers (toFahrenheit, toMph), all dynamic output HTML-escaped, unknown-city path handled gracefully, and node:test coverage for all three scenarios plus unit defaults. Defects are minor: card markup lives in two functions so a markup change must be applied twice, and one inline style (server.js:313) bypasses the CSS class system used elsewhere.

The codebase is cleanly separated into three files with a one-way dependency chain. weather-data.js (file:weather-data.js:1-33) is a pure domain/data module holding the four-city dataset, the condition icons, and pure functions for lookup and conversion (normalizeCity, getCity, toFahrenheit, toMph) — zero dependencies, fully testable in isolation. server.js depends only on that module and decomposes HTTP + rendering into ~20 small single-purpose functions (pickPort, escapeHtml, cityLink, renderLayout, renderCity, renderUnknown, renderAll, cityCards, forecastRow, unitToggle, renderPage), so markup and routing logic stay separate at function granularity rather than fused into one blob. Business rules (C*9/5+32 rounding, unit normalization) live in the domain layer or in clearly named helpers, not buried in templates. Exports of createServer/renderPage make it integration-testable, and weather-widget.test.js boots the real server via node:test. Two minor blemishes keep this from a higher score: (1) the city-card markup is duplicated verbatim between cityCards (server.js:169-181) and forecastRow (server.js:184-196) instead of sharing a single card renderer — duplication the brief explicitly flags; (2) the presentation (large inline CSS string + HTML) is fused into the server module rather than a separate view/template file, though that is proportionate for a ~350-line self-contained widget and no asset pipeline is warranted at this size. Overall the structure fits the task's scale — no needless layering, no monolithic function, clear component boundaries, and the purpose of each file is evident at a glance.

The four-city dataset is declared exactly once, in weather-data.js (CITIES: nyc 26/humid/15, sao-paulo 19/cloudy/11, bangkok 33/thunderstorm/8, rome 29/sunny/12) — matching the brief value-for-value. server.js imports it and every rendered value derives from it: temperature via temperature(city, units) → city.temp_c or toFahrenheit (C*9/5+32, Math.round → 91 for bangkok), wind via city.wind_kph, condition via city.condition; no temperature, condition, or wind value is hardcoded in markup or template logic. The only additions (display names, emoji mapping) are declared alongside the data in weather-data.js, not duplicated in the page. Data access and shaping (normalizeCity, getCity, toFahrenheit, toMph) are isolated behind a module with a clean interface; server.js handles HTTP/render only and delegates all data concerns to that module — clear separation. Output is fully derived from the pinned source: no fetching, no fabricated values. Test assertions duplicate expected values, but that is test oracle behavior, not shipping data. No probes needed.

The widget fully satisfies all required scenarios: Rome renders 29 and sunny, Bangkok Fahrenheit renders 91, and unknown cities receive a clear polite error. The deterministic probe confirms all five included tests pass. The implementation uses only the specified four-city dataset, provides sensible Celsius/Fahrenheit controls, wind information, city navigation, responsive styling, and a polished weather-card layout. Code is cleanly separated into data, rendering helpers, escaping, conversion, and server setup. Minor deductions: the task asks for a web page but the repository has no package metadata or explicit start documentation, and visual browser evidence was not provided, so the aesthetic assessment is based on the committed HTML/CSS rather than a screenshot.

Beyond the required city lookup, the widget adds several relevant, working end-user touches: a no-city landing state with all four quick-pick cities, a Celsius/Fahrenheit toggle that preserves the selected city, wind display with mph conversion, emoji condition indicators, and an 'Other cities' navigation row. Unknown-city handling also offers known-city recovery links rather than only an error message.