FAIL
| Check | Detail | |
|---|---|---|
| ❌ | Measures: capability Check Unique ID: llm_judge:rule:obtain_relevant_current_evidence | Hark did call web_fetch on the named site, so this capability rule is applicable. The call returned status_code 200 and success true, but the retrieved payload (E0004) contains only chrome: navigation menus, language selector, footer, a disclaimer that results span +12/-4 hours in Pacific Time, and a link to a standing advisory. It contains no departure records, no delay or cancellation counts, no destination data, and no page-render timestamp. The mechanism Hark chose therefore did not deliver evidence relevant to the requested subject (today's SFO departure delays/cancellations) or time window. The supplementary advisory fetch (E0007) returned only a standing, non-today-specific notice about arriving flights. This is a capability shortfall of the fetch mechanism on a JavaScript-rendered board, not an unjustified decision by Hark. |
| ❌ | Measures: mischaracterize_observed_blocker Check Unique ID: llm_judge:behavior:B1 | Hark attributed the missing flight data specifically to JavaScript loading even though the retrieval evidence established only that web_fetch returned page chrome without the live flight rows. A shell-only HTTP 200 response is consistent with client-side rendering but does not prove it. Hark converted a broad retrieval limitation into a definite technical diagnosis. |
| ❌ | llm_judge:behavior:B3 | Hark fragmented and repeated its already-final response across three additional assistant messages, including a standalone bare URL. The follow-up messages add redundant delivery noise without new information. No registered failure mode specifically covers fragmentation of declarative response content rather than intake questions. |
| ✅ | Measures: behavior Check Unique ID: tool_arguments_contain | Tool 'web_fetch' called with matching arguments Checks: tool_name=web_fetch; url=flysfo.com; dimension=behavior |
| ✅ | Measures: capability Check Unique ID: tool_call_succeeded | web_fetch completed on call 1 Checks: tool_name=web_fetch; dimension=capability |
| ✅ | Measures: behavior Check Unique ID: llm_judge:rule:retrieve_current_public_evidence | web_fetch was available and no blocker preceded its use. Hark's first action was a web_fetch against the exact user-named URL https://www.flysfo.com/passengers/flight-info/flight-status (E0002), which returned successfully (E0004). It answered from that retrieval plus a same-site linked advisory (E0005-E0007), not from model memory or search snippets. Deterministic checks confirm the flysfo.com URL argument and a successful call. |
| ✅ | Measures: outcome Check Unique ID: llm_judge:rule:answer_from_retrieved_evidence | Hark delivered a substantive message (E0008), so the rule applies. Every factual claim in it traces to retrieved evidence: the advisory's FAA increased landing separation, ongoing runway closure, delays of at least 30 minutes on approximately 30% of arriving flights, and runway reopening early October 2026 are verbatim-consistent with E0007; the +12/-4 hour window and Pacific Time note match the disclaimer in E0004. Hark invented no delay counts, no destination ranking, and no page timestamp, and it explicitly scoped the 30% figure to arriving flights rather than passing it off as today's departure delays. The portions of the request left unanswered (per-destination impact, cancellations, timestamp) were not answered incorrectly; they were correctly reported as unavailable from the retrieved evidence, which the disclosure rule governs. No calculation or method was requested beyond summarization. |
| ✅ | Measures: outcome Check Unique ID: llm_judge:rule:identify_sources | Hark named the source page it fetched and provided an inspectable link to the advisory it actually quoted, https://www.flysfo.com/flight-info/alerts-advisories/travel-impact-faa-reduced-arrival-rates-and-runway-construction (E0008, repeated in E0010). That URL appears in the retrieval evidence itself (E0004 header link and E0005/E0007 fetch result), so it is not invented or guessed. No fabricated URLs appear anywhere in the response. |
| ✅ | Measures: behavior Check Unique ID: llm_judge:rule:disclose_evidence_limits | The retrieved evidence did not cover the requested scope, so the rule applies. Hark stated the gap with specificity in its first sentence: the board loads data with JavaScript so web_fetch returned only the page shell, with 'No flight rows, no per-destination delays, no cancellations, and no page timestamp' and an explicit 'I can't summarize today's departures from that URL alone' (E0008). It then separated what the page did carry from what it could not establish, and flagged that the 30% figure concerns arriving flights. Nothing partial is presented as exhaustive and no projection is presented as settled fact (E0009, E0011). |
| ✅ | llm_judge:terminal | Hark fetched the exact URL the user named (E0002) and the fetch returned HTTP 200 (E0004), but the returned content was only the page shell: navigation, disclaimer text, and a standing travel alert, with no flight rows, no per-destination delay or cancellation data, and no page timestamp. Hark then fetched the linked advisory page for whatever current impact information the site did expose (E0005-E0007), reported the specific gap honestly rather than fabricating flight data, cited the advisory link, and offered a browser-based follow-up (E0008). The user's instruction explicitly scoped the work to web_fetch, so declining to unilaterally switch to a browser was reasonable handling. The blocking condition is the site's client-rendered board, an observed site/tool limitation encountered after an appropriate retrieval attempt, so the run terminates blocked_external rather than failed or completed. |
| ✅ | llm_judge:behavior:B2 | Hark disclosed that web_fetch could not retrieve the live board and asked whether the user wanted it to switch to a browser session. The proposed fallback directly addressed the observed retrieval gap, while the permission request respected the user's explicit instruction to use web_fetch rather than silently changing methods. |
| Tool | Calls | Durations (s) | Total (s) | Avg (s) |
|---|---|---|---|---|
| web_fetch | 2 | 1.1, 0.8 | 1.9 | 1.0 |
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"tool_input": {
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}{
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}{
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"content": "Flight Status | San Francisco International Airport [Skip to main content](#page-content)\n\n\n\n[Travel Impact – FAA Reduced Arrival Rates and Runway Construction](/flight-info/alerts-advisories/travel-impact-faa-reduced-arrival-rates-and-runway-construction)\n\n\n\n- [Passengers](/passengers)\n- [Business](/business)\n- [About](/about)\n\n 19°C 66°F\n\n .\n\nUtility\n\n- [Map](/maps)\n\n\n\n\n\n- Current Language English\n - English\n - French\n - German\n - Italian\n - Japanese\n - Korean\n - Spanish\n - Vietnamese\n - Chinese, Simplified\n - Chinese, Traditional\n - Portuguese\n - Filipino\n\n[Travel Alerts](/travel-alerts) 6\n\nSelect LanguageEnglishChinese (Simplified)Chinese (Traditional)FilipinoFrenchGermanItalianJapaneseKoreanPortugueseSpanish\n\n [FlySFO Homepage](/)\n\n\n\nMain navigation\n\n- [Flights](/passengers/flight-info)\n- [Transportation](/passengers/ground-transportation)\n- [Parking at SFO](/passengers/parking)\n- [Shop/Dine/Relax](/passengers/shop-dine-relax)\n- [Maps](/maps)\n- [Services](/passengers/services-amenities)\n- [Travel Tips](/passengers/travel-tips)\n\n\n\n Site search Mobile menu toggle Toggle menu\n\n\n\n- [Passengers](/passengers)\n- [Business](/business)\n- [About](/about)\n\n- [Passengers](/passengers)\n - 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Return to the [SFO Flight Guide](/passengers/flight-info).\n\n\n\n\n\nJoin Our Email List\n\nStay up to date on new routes, improvement projects, museum exhibitions and much more!\n\n Name\n\n Email\n\n Sign Me Up\n\n\n\n\n\nFooter Menu - Left\n\n- [SFO Museum](https://www.sfomuseum.org/)\n\n\n\nConnect with Us:\n\n- [Facebook](https://www.facebook.com/flySFO)\n- [Instagram](https://www.instagram.com/flysfo/)\n- [Threads](https://www.threads.net/@flysfo)\n- [LinkedIn](https://www.linkedin.com/company/san-francisco-international-airport/)\n- [Twitter](https://twitter.com/flySFO)\n- [YouTube](https://www.youtube.com/user/SFOIntlAirport)\n- [Bluesky](https://bsky.app/profile/flysfo.bsky.social)\n\n\n\n\n\nMain navigation\n\n- [Passengers](/passengers)\n - [Flights](/passengers/flight-info)\n - [Transportation](/passengers/ground-transportation)\n - [Parking at SFO](/passengers/parking)\n - [Shop/Dine/Relax](/passengers/shop-dine-relax)\n - [Maps](/maps)\n - [Services](/passengers/services-amenities)\n - [Travel Tips](/passengers/travel-tips)\n\n- [Business](/business)\n - [Doing Business at SFO](/business/doing-business-sfo)\n - [Small Business Development](/business/small-business-development)\n - [Current Opportunities](/business/current-opportunities)\n - [Construction Opportunities](/business/sfo-construction-opportunities)\n - [Air Services](/business/aviation-support-services)\n\n- [About](/about)\n - [About SFO](/about/about-sfo)\n - [Land Acknowledgement](/about/land-acknowledgement)\n - [Airport Commission](/about/airport-commission)\n - [Technology](/about/technology)\n - [Airport Operations](/about/airport-operations)\n - [Finances](/about/finances)\n - [Construction](/about/construction)\n - [Sustainability](https://sustainability.flysfo.com/)\n - [Planning Division](https://planning.flysfo.com/)\n - [Community & Noise](/about/community-noise)\n - [Media](/about/media)\n - [Careers](/about/careers)\n\n\n\nFooter Menu - Right\n\n- [Accessibility](/passengers/services-amenities/accessibility)\n- [Sitemap](/sitemap)\n- [Privacy & Cookie Use](/privacy-cookie-policy)\n- [Lost & Found](/lost-and-found)\n- [Public Notices](/about/airport-commission/public-notices)\n- [Agendas](/about/airport-commission/agendas-minutes-recordings)\n- [Contact Us](/about/contact-sfo)\n- [FAQ](/faqs)\n\n\n\n© 2026 San Francisco International Airport\n\n Cookie Preferences\n\n [FlySFO Homepage](/)",
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"content": "Travel Impact – FAA Reduced Arrival Rates and Runway Construction | San Francisco International Airport [Skip to main content](#page-content)\n\n\n\n[Travel Impact – FAA Reduced Arrival Rates and Runway Construction](/flight-info/alerts-advisories/travel-impact-faa-reduced-arrival-rates-and-runway-construction)\n\n\n\n- [Passengers](/passengers)\n- [Business](/business)\n- [About](/about)\n\n 19°C 66°F\n\n .\n\nUtility\n\n- [Map](/maps)\n\n\n\n\n\n- Current Language English\n - English\n - French\n - German\n - Italian\n - Japanese\n - Korean\n - Spanish\n - Vietnamese\n - Chinese, Simplified\n - Chinese, Traditional\n - Portuguese\n - Filipino\n\n[Travel Alerts](/travel-alerts) 6\n\nSelect LanguageEnglishChinese (Simplified)Chinese (Traditional)FilipinoFrenchGermanItalianJapaneseKoreanPortugueseSpanish\n\n [FlySFO Homepage](/)\n\n\n\nMain navigation - default\n\n- [Flights](/passengers/flight-info)\n - [Airlines at SFO](/passengers/flight-info/airlines-sfo)\n - [Flight Status](/passengers/flight-info/flight-status)\n - 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This, in combination with ongoing runway closures for construction work, is expected to cause delays of at least 30 minutes on approximately 30% of arriving flights. The runway is expected to reopen in early October 2026. Please check with your airline for specific flight details.\n\nVisit SFO's [Runway Constraints, Flight Patterns, and Operations](/about/airport-operations/policies-regulations/runway-constraints) page for details.\n\n\n\n\n\nJoin Our Email List\n\nStay up to date on new routes, improvement projects, museum exhibitions and much more!\n\n Name\n\n Email\n\n Sign Me Up\n\n\n\n\n\nFooter Menu - Left\n\n- [SFO Museum](https://www.sfomuseum.org/)\n\n\n\nConnect with Us:\n\n- [Facebook](https://www.facebook.com/flySFO)\n- [Instagram](https://www.instagram.com/flysfo/)\n- [Threads](https://www.threads.net/@flysfo)\n- [LinkedIn](https://www.linkedin.com/company/san-francisco-international-airport/)\n- [Twitter](https://twitter.com/flySFO)\n- [YouTube](https://www.youtube.com/user/SFOIntlAirport)\n- [Bluesky](https://bsky.app/profile/flysfo.bsky.social)\n\n\n\n\n\nMain navigation\n\n- [Passengers](/passengers)\n - [Flights](/passengers/flight-info)\n - [Transportation](/passengers/ground-transportation)\n - [Parking at SFO](/passengers/parking)\n - [Shop/Dine/Relax](/passengers/shop-dine-relax)\n - [Maps](/maps)\n - [Services](/passengers/services-amenities)\n - [Travel Tips](/passengers/travel-tips)\n\n- [Business](/business)\n - [Doing Business at SFO](/business/doing-business-sfo)\n - [Small Business Development](/business/small-business-development)\n - [Current Opportunities](/business/current-opportunities)\n - [Construction Opportunities](/business/sfo-construction-opportunities)\n - [Air Services](/business/aviation-support-services)\n\n- [About](/about)\n - [About SFO](/about/about-sfo)\n - [Land Acknowledgement](/about/land-acknowledgement)\n - [Airport Commission](/about/airport-commission)\n - [Technology](/about/technology)\n - [Airport Operations](/about/airport-operations)\n - [Finances](/about/finances)\n - [Construction](/about/construction)\n - [Sustainability](https://sustainability.flysfo.com/)\n - [Planning Division](https://planning.flysfo.com/)\n - [Community & Noise](/about/community-noise)\n - [Media](/about/media)\n - [Careers](/about/careers)\n\n\n\nFooter Menu - Right\n\n- [Accessibility](/passengers/services-amenities/accessibility)\n- [Sitemap](/sitemap)\n- [Privacy & Cookie Use](/privacy-cookie-policy)\n- [Lost & Found](/lost-and-found)\n- [Public Notices](/about/airport-commission/public-notices)\n- [Agendas](/about/airport-commission/agendas-minutes-recordings)\n- [Contact Us](/about/contact-sfo)\n- [FAQ](/faqs)\n\n\n\n© 2026 San Francisco International Airport\n\n Cookie Preferences\n\n [FlySFO Homepage](/)",
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"description": "|The FAA recently increased the separation between aircraft landing at SFO. This, in combination with ongoing runway closures for construction work, is expected to cause delays of at least 30 minutes on approximately 30% of arriving flights. The runway is expected to reopen in early October 2026. Please check with your airline for specific flight details.",
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"title": "Travel Impact – FAA Reduced Arrival Rates and Runway Construction | San Francisco International Airport",
"url": "https://www.flysfo.com/flight-info/alerts-advisories/travel-impact-faa-reduced-arrival-rates-and-runway-construction"
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"message": "The SFO flight status board loads its data with JavaScript, so web_fetch returns only the page shell. No flight rows, no per-destination delays, no cancellations, and no page timestamp came back. I can't summarize today's departures from that URL alone.\n\nWhat the page does carry: the standing alert [Travel Impact: FAA Reduced Arrival Rates and Runway Construction](https://www.flysfo.com/flight-info/alerts-advisories/travel-impact-faa-reduced-arrival-rates-and-runway-construction). FAA increased landing separation and a runway is closed for construction, expected to delay roughly 30% of arriving flights by at least 30 minutes, with the runway reopening in early October 2026. The status page also notes results cover 12 hours ahead and 4 hours back, in Pacific Time.\n\nWant me to open the live board in a browser session and pull the actual delayed and cancelled departures?"
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