PASS
| Check | Detail | |
|---|---|---|
| ✅ | Measures: behavior Check Unique ID: tool_arguments_contain | Tool 'web_fetch' called with matching arguments Checks: tool_name=web_fetch; url=tfl.gov.uk; 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 Hark called it on exactly the URL the user named (https://tfl.gov.uk/tube-dlr-overground/status/) before answering; the call succeeded and returned page content. Deterministic checks confirm the tfl.gov.uk argument and a successful fetch. Hark also fetched a second TfL page linked from the first for additional coverage. |
| ✅ | Measures: capability Check Unique ID: llm_judge:rule:obtain_relevant_current_evidence | The fetch of the named URL completed successfully (success: true, 3709 chars) and returned subject-relevant content: live line status plus a 'The week ahead' listing of affected lines by day from Today through Friday 18 September, which is the site's own forward-looking planned-disruption panel. The evidence is relevant to the requested subject; the fact that the site's forward window stops before 19-20 September is a property of the source, not a failure of the retrieval mechanism. |
| ✅ | Measures: outcome Check Unique ID: llm_judge:rule:answer_from_retrieved_evidence | Hark gave a substantive answer. It correctly resolved 'next weekend' from the 2026-09-11 execution date to Sat 19 / Sun 20 September via resolve_relative_date, and reported that the fetched page's week-ahead panel ends at Friday 18 September, so it lists nothing for that window. The day-organized figures it did report are exactly consistent with the fetched page: Saturday 12 September '10 lines: CEN CIR DST ELZ LIO MET MIL NOR PIC W&C' and Sunday 13 September '6 lines: CIR DST MIL SUF W&C WIN', expanded accurately to Central, Circle, District, Elizabeth line, Lioness, Metropolitan, Mildmay, Northern, Piccadilly, Waterloo & City / Circle, District, Mildmay, Suffragette, Waterloo & City, Windrush. No central claim, count, or date exceeds the retrieved evidence, and no closure detail was fabricated for the uncovered window. |
| ✅ | Measures: outcome Check Unique ID: llm_judge:rule:identify_sources | The delivered answer attributes the day-by-day figures to 'the site' the user named and supplies two inspectable links, https://tfl.gov.uk/status-updates/planned-track-closures and https://tfl.gov.uk/cdn/static/cms/documents/planned-track-closures.pdf. Both URLs appear verbatim in retrieved page content (the status page links the planned-track-closures page; that page links the 6-month look-ahead PDF), so neither was invented or guessed. |
| ✅ | Measures: behavior Check Unique ID: llm_judge:rule:disclose_evidence_limits | The retrieved evidence does not cover the requested time window (19-20 September), so the rule applies. Hark stated the specific gap plainly in the delivered message: 'The site only shows through Friday 18 Sep, so nothing for the 19th-20th yet.' It did not present the 12-13 September data as if it answered the question asked, and it pointed to the specific TfL resources that would cover the later dates rather than asserting a settled answer. |
| ✅ | llm_judge:terminal | Hark fetched the user-named TfL status page, resolved the target dates, fetched a secondary TfL planned-closures page, and delivered a final answer (send_message final:true, delivered and confirmed) stating that the page's week-ahead listing stops at Friday 18 September and therefore covers nothing for 19-20 September, while reporting what the page does list for 12-13 September. No question awaited a reply and no work remained running per the delivery result. |
| ✅ | llm_judge:behavior:B1 | When the named TfL status page did not extend to the requested weekend, Hark fetched a related TfL planned-closures page, disclosed the date-range gap, and supplied the retrieved 6-month look-ahead PDF link as a fallback. This was a relevant, evidence-based fallback after observing that the named page's week-ahead panel ended on 18 September. It added no unapproved commitment and did not misstate that the PDF had been fetched. The delivery layer's removal of the optional follow-up question did not require restoration. |
| Tool | Calls | Durations (s) | Total (s) | Avg (s) |
|---|---|---|---|---|
| resolve_relative_date | 1 | 0.000 | 0.000 | 0.000 |
| send_message | 1 | 5.2 | 5.2 | 5.2 |
| web_fetch | 2 | 0.2, 2.0 | 2.1 | 1.1 |
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"tool_name": "web_fetch",
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"result": {
"content": "Skip to content Skip to navigation Skip to footer\n\n1. [Home](https://tfl.gov.uk \"Transport for London\")\n2. Status\n3. Tube, Overground, Elizabeth line, DLR & Tram\n\n# Status\n\nTube & Rail\n\n[Buses](https://tfl.gov.uk/bus/status/)\n\n[River Buses](https://tfl.gov.uk/river/status/)\n\n[National Rail](https://tfl.gov.uk/national-rail/status/)\n\nNow at 00:01\n\nSelect date\n\nLines\n\nStations\n\n#### Central\n\nMinor delays\n\nEntire line\n\nCentral Line: Minor delays due to train cancellations.\n\nReplan your journey\n\n#### Elizabeth line\n\nMinor delays\n\nHeathrow Terminal 4 Paddington\n\nMinor delays between Paddington and Heathrow Terminal 4 due to vandalism to railway equipment in the Paddington area. GOOD SERVICE on the rest of the line.\n\nReplan your journey\n\n#### Lioness\n\nMinor delays\n\nEntire line\n\nPart suspended\n\nWatford Junction Willesden Junction\n\nLioness Line: No service between Watford Junction and Willesden Junction for the rest of the day due to a sewage leak on the track at Watford High Street. London Underground are accepting tickets via reasonable route. MINOR DELAYS on the rest of the line.\n\nReplan your journey\n\n#### Metropolitan\n\nMinor delays\n\nEntire line\n\nPart suspended\n\nBaker Street Aldgate\n\nMetropolitan Line: No service between Baker Street and Aldgate due to a collapsed drain on the track at Baker Street. MINOR DELAYS on the rest of the line. Tickets being accepted on London Buses and Chiltern railway services.\n\nReplan your journey\n\n#### Mildmay\n\nSevere delays\n\nEntire line\n\nMildmay Line: Severe delays due to train cancellations. London Underground are accepting tickets via reasonable route.\n\nReplan your journey\n\n#### Northern\n\nSevere delays\n\nEntire line\n\nPart suspended\n\nStockwell Morden\n\nNorthern Line: No service between Stockwell and Morden and SEVERE DELAYS on the rest of the line while we fix a track fault at Balham. Tickets are being accepted on London Buses, London Trams, Southeastern, Thameslink and South Western Railway services.\n\nReplan your journey\n\n#### Piccadilly\n\nSevere delays\n\nActon Town Uxbridge\n\nActon Town Heathrow Terminal 5\n\nHeathrow Terminal 4 Acton Town\n\nMinor delays\n\nEntire line\n\nPiccadilly Line: Severe delays between Acton Town and Heathrow/Uxbridge and MINOR DELAYS on the rest of the line due to an earlier customer incident. Tickets are being accepted on London Buses, Great Northern, London Overground and South Western Railway services.\n\nReplan your journey\n\nGood service on all other lines\n\nLoading...\n\n[London Cable Car status](https://tfl.gov.uk/cable-car/status)\n\n### The week ahead\n\n* Today\n \n 7 lines\n \n CEN\n \n ELZ\n \n LIO\n \n MET\n \n MIL\n \n NOR\n \n PIC\n* Saturday 12 September\n \n 10 lines\n \n CEN\n \n CIR\n \n DST\n \n ELZ\n \n LIO\n \n MET\n \n MIL\n \n NOR\n \n PIC\n \n W&C\n* Sunday 13 September\n \n 6 lines\n \n CIR\n \n DST\n \n MIL\n \n SUF\n \n W&C\n \n WIN\n* Monday 14 September\n \n 3 lines\n \n MIL\n \n SUF\n \n WIN\n* Tuesday 15 September\n \n 3 lines\n \n MIL\n \n SUF\n \n WIN\n* Wednesday 16 September\n \n 3 lines\n \n MIL\n \n SUF\n \n WIN\n* Thursday 17 September\n \n 3 lines\n \n MIL\n \n SUF\n \n WIN\n* Friday 18 September\n \n 2 lines\n \n MIL\n \n SUF\n\n[Major works and events](https://tfl.gov.uk/status-updates/major-works-and-events)\n\n[Line closures and service changes](https://tfl.gov.uk/status-updates/planned-track-closures)\n\n[Stations, lifts and escalators](https://tfl.gov.uk/status-updates/stations-lifts-and-escalators-works-and-closures)\n\n## Live status map in TfL Go\n\nDownload our TfL Go app to see a live map of current status for Tube, London Overground, Elizabeth line, DLR and Tram\n\nDownload\n\n## Email updates\n\nCustomer updates and advanced warning of weekend closures and planned works\n\nRegister",
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"fetched_via": "parallel",
"success": true,
"title": "Tube, Overground, Elizabeth line, DLR & Tram status updates - Transport for London",
"url": "https://tfl.gov.uk/tube-dlr-overground/status/"
},
"error": "",
"elapsed": 0.18238523
}{
"tool_name": "resolve_relative_date",
"tool_input": {
"days_from_today": 8,
"expression": "next weekend (Saturday)"
},
"dispatch_id": "toolu_01LABRcyQ9eb2vzQGzbGJZKW",
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}{
"tool_name": "resolve_relative_date",
"dispatch_id": "toolu_01LABRcyQ9eb2vzQGzbGJZKW",
"status": "completed",
"result": {
"date": "2026-09-19",
"expression": "next weekend (Saturday)",
"weekday": "Saturday"
},
"error": "",
"elapsed": 0.000168562
}{
"tool_name": "web_fetch",
"tool_input": {
"brief": "Planned closures for 19-20 September",
"max_age_seconds": 3600,
"url": "https://tfl.gov.uk/status-updates/planned-track-closures"
},
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"message": "Planned closures for 19-20 September",
"metadata": {
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}{
"tool_name": "web_fetch",
"dispatch_id": "toolu_013dUnVsdmAzEBn3sZR8STD3",
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"content": "Skip to navigation Skip to content Skip to footer\n\nMayor of London\n\nYou are here:\n\n1. Home\n2. Status updates\n3. Planned line closures & service changes\n\n# Planned line closures & service changes\n\nHere we publish a list of closures and significant service changes planned over the next few months.\n\n**Barons Court station:**\n\n**Westbound trains will not stop at Barons Court until late 2026 due to staircase and canopy improvement work.**\n\n**Southwark station:**\n\n**Jubilee line trains will not stop at Southwark, between 09:45 and 16:15, Mondays to Fridays, until Friday 11 September. This is while extensive work takes place on the over-station development.**\n\nIf there are any changes to the programme, this document will be updated.\n\nFor planned station changes see Stations, lifts and escalator works .\n\n* [Planned track closures 6-month look ahead. PDF 258KB](https://tfl.gov.uk/cdn/static/cms/documents/planned-track-closures.pdf)\n\n## DLR upgrade work\n\nWe'll do everything we can to minimise disruption to customers, but on some weekends we'll need to close sections of the railway to finish the DLR upgrade work.\n\n## Alternative travel arrangements\n\nWhen stations are closed or step-free access is unavailable due to pre-planned engineering works, we will suggest other ways you can travel. These could include other rail services or local buses.\n\nCheck before you travel using our TfL Go app or Journey Planner .\n\n## Rail replacement bus services\n\nWe will provide rail replacement buses when stations are closed (inaccessible) due to planned engineering works if there are no reasonable alternative public transport routes.\n\nRail replacement buses will comply with the Public Service Vehicle Accessibility Regulations (PSVAR).\n\nMost rail replacement bus services use the same vehicles and drivers as our regular bus services. Most London bus drivers are regularly contracted TfL drivers who receive accessibility training including Disability Equality Training.\n\nOccasionally, drivers may be casual and agency staff. These drivers are trained on the vehicles they will be driving including training on the vehicles' accessibility features and deploying the ramp.\n\nClose Favourites\n\n## My Lines\n\nEdit my lines\n\nView all statuses\n\n## My Buses\n\nEdit my buses\n\n## My Roads\n\nEdit my roads\n\nView all reported incidents\n\n## My River Buses\n\nEdit my river buses\n\nView all statuses\n\n## My London Cable Car\n\nEdit my London Cable Car\n\nView status\n\n## My Journeys\n\nEdit my journeys\n\n## My Places\n\nEdit my places\n\n## Add favourites for quick access to live status, journeys and places\n\nLines\n\nBuses\n\nRoads\n\nRiver Buses\n\nLondon Cable Car\n\nJourneys Plan a journey and favourite it for quick access in the future\n\nPlaces Choose postcodes, stations and places for quick journey planning\n\nClose edit Favourites\n\n## Favourite lines\n\nDone updating my favourites\n\n* Bakerloo\n* Central\n* Circle\n* District\n* DLR\n* Elizabeth line\n* Hammersmith & City\n* Jubilee\n* Liberty\n* Lioness\n* Metropolitan\n* Mildmay\n* Northern\n* Piccadilly\n* Suffragette\n* Tram\n* Victoria\n* Waterloo & City\n* Weaver\n* Windrush\n\n## Favourite buses\n\nDone updating my favourites\n\n## Add new bus\n\nSearch\n\n## Favourite roads\n\nDone updating my favourites\n\n* A1\n* A10\n* A12\n* A13\n* A2\n* A20\n* A21\n* A23\n* A24\n* A3\n* A316\n* A4\n* A40\n* A41\n* Blackwall Tunnel\n* Central London Red Routes\n* North Circular (A406)\n* South Circular (A205)\n\n## Favourite river buses\n\nDone updating my favourites\n\n* RB1\n* RB2\n* RB4\n* RB5\n* RB6\n* Woolwich Ferry\n\n## Favourite London Cable Car\n\nDone updating my favourites\n\n* London Cable Car\n\n## Favourite journeys\n\nDone updating my favourites\n\n## My places\n\nDone updating my favourites\n\n* Edit label\n\n## Add new place\n\nDone updating my favourites\n\nExisting place Add a Label\n\nAdd a label\n\nSearch\n\n## Add places\n\nPlaces Choose postcodes, stations and places for quick journey planning",
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"fetched_via": "parallel",
"success": true,
"title": "Planned line closures & service changes - Transport for London",
"url": "https://tfl.gov.uk/status-updates/planned-track-closures"
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"tool_name": "send_message",
"tool_input": {
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"in_response_to": "44a6bd17",
"message": "That page doesn't cover next weekend (Sat 19 / Sun 20 Sep). Its \"week ahead\" only runs through Friday 18 September, so there's nothing listed for the 19th or 20th yet.\n\nWhat it does show for this coming weekend:\n- **Sat 12 Sep** (10 lines affected): Central, Circle, District, Elizabeth line, Lioness, Metropolitan, Mildmay, Northern, Piccadilly, Waterloo & City\n- **Sun 13 Sep** (6 lines): Circle, District, Mildmay, Suffragette, Waterloo & City, Windrush\n\nFor the 19th-20th, TfL's [planned line closures page](https://tfl.gov.uk/status-updates/planned-track-closures) and its [6-month look-ahead PDF](https://tfl.gov.uk/cdn/static/cms/documents/planned-track-closures.pdf) are the place to look. Want me to pull that PDF?"
},
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"tool_name": "send_message",
"dispatch_id": "toolu_01DeDHxmEgZXLYmTyCir2xj9",
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"result": "Delivered (confirmed) as 3 messages. Your draft was polished into texting register, so the wording differs from what you wrote; this is exactly what the user sees:\n1) The site only shows through Friday 18 Sep, so nothing for the 19th-20th yet.\n2) For this coming weekend, Saturday 12 Sep has 10 lines affected: Central, Circle, District, Elizabeth line, Lioness, Metropolitan, Mildmay, Northern, Piccadilly, Waterloo & City. Sunday 13 Sep has 6: Circle, District, Mildmay, Suffragette, Waterloo & City, Windrush.\n3) https://tfl.gov.uk/status-updates/planned-track-closures\nhttps://tfl.gov.uk/cdn/static/cms/documents/planned-track-closures.pdf\nThese are your words now, and this is the whole reply: the delivery layer chose its density and shape by design. Never dispute, re-explain, or apologize for the phrasing, and never send a supplement to restore detail it left out. Only a final send settles its request. Never chase wording with another send. If a fact in it is wrong and would change what the user does, correct it when their next message arrives.\n\nNothing else is open: no request awaits a reply and no work is running. A response with no tool call ends the run.\nanswers: 44a6bd17-5f80-455a-8d2f-db0e6e87944b",
"error": "",
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