{
  "$schema": "https://verifymcp.io/schemas/changelog.json",
  "server": "com-extralingo-extralingo",
  "component": "www",
  "generated_at": "2026-11-05T13:30:45.787Z",
  "tracking_since": "2026-10-03",
  "counts": {
    "critical": 0,
    "security": 21,
    "functional": 0,
    "cosmetic": 0
  },
  "events": [
    {
      "id": "chg_01a19a7d-fbfd-7e61-a627-51d1ca55bfc0",
      "kind": "check.verdict",
      "family": "stability",
      "subject_kind": "check",
      "subject": "stability",
      "subject_child": "",
      "from_code": "stability.building_history",
      "to_code": "stability.stable",
      "from_value": "0.97",
      "to_value": "pass",
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-11-02",
      "occurred_at": "2026-11-02 04:21:50.165152+00",
      "observed_since": "2026-11-01",
      "source": "scan",
      "summary": "Stability (0.97 → pass)",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a19a7d-fbfd-7e61-a627-51d1ca55bfc0"
    },
    {
      "id": "chg_01a1577d-4559-7edf-a589-372dd8123f35",
      "kind": "check.verdict",
      "family": "transport",
      "subject_kind": "check",
      "subject": "transport",
      "subject_child": "",
      "from_code": "transport.unreachable",
      "to_code": "transport.verified",
      "from_value": "fail",
      "to_value": "pass",
      "materiality": "security",
      "direction": "improvement",
      "score_delta": null,
      "detail": {
        "transport": "streamable-http"
      },
      "occurred_on": "2026-10-20",
      "occurred_at": "2026-10-20 04:06:29.853201+00",
      "observed_since": "2026-10-19",
      "source": "scan",
      "summary": "Transport (fail → pass)",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a1577d-4559-7edf-a589-372dd8123f35"
    },
    {
      "id": "chg_01a15256-dd48-77fe-85ab-0c68745b7c4d",
      "kind": "check.verdict",
      "family": "transport",
      "subject_kind": "check",
      "subject": "transport",
      "subject_child": "",
      "from_code": "transport.verified",
      "to_code": "transport.unreachable",
      "from_value": "pass",
      "to_value": "fail",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {
        "transport": "streamable-http"
      },
      "occurred_on": "2026-10-19",
      "occurred_at": "2026-10-19 04:06:26.867187+00",
      "observed_since": "2026-10-18",
      "source": "scan",
      "summary": "Transport (pass → fail)",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a15256-dd48-77fe-85ab-0c68745b7c4d"
    },
    {
      "id": "chg_01a10514-28af-7e00-af97-bb89c0026798",
      "kind": "check.verdict",
      "family": "tool-safety-injection",
      "subject_kind": "check",
      "subject": "tool-safety-injection",
      "subject_child": "",
      "from_code": "toolsafety.injection_markers",
      "to_code": "toolsafety.injection_clean",
      "from_value": "fail",
      "to_value": "pass",
      "materiality": "security",
      "direction": "improvement",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Injection markers (fail → pass)",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28af-7e00-af97-bb89c0026798"
    },
    {
      "id": "chg_01a10514-28b2-7d21-bc27-44a676f711ca",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "ask_school_question",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "ask_school_question"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “ask_school_question” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28b2-7d21-bc27-44a676f711ca"
    },
    {
      "id": "chg_01a10514-28b7-7970-8696-f93284eeb232",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "calculate_trip_price",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "calculate_trip_price"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “calculate_trip_price” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28b7-7970-8696-f93284eeb232"
    },
    {
      "id": "chg_01a10514-28bb-7969-ae00-7bc29503e095",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "create_booking",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "create_booking"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “create_booking” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28bb-7969-ae00-7bc29503e095"
    },
    {
      "id": "chg_01a10514-28c3-714c-899e-c0d8cdb6eb73",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "email_trip",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "email_trip"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “email_trip” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28c3-714c-899e-c0d8cdb6eb73"
    },
    {
      "id": "chg_01a10514-28c5-782f-a78e-89b006376ff6",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "get_accommodation_details",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "get_accommodation_details"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “get_accommodation_details” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28c5-782f-a78e-89b006376ff6"
    },
    {
      "id": "chg_01a10514-28c7-74fa-9f1d-d9994b2aae71",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "get_course_details",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "get_course_details"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “get_course_details” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28c7-74fa-9f1d-d9994b2aae71"
    },
    {
      "id": "chg_01a10514-28c9-786a-86cd-7f77d2e0cf6c",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "get_school",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "get_school"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “get_school” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28c9-786a-86cd-7f77d2e0cf6c"
    },
    {
      "id": "chg_01a10514-28cd-750c-90b3-4e57ae435f85",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "get_school_filters",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "get_school_filters"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “get_school_filters” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28cd-750c-90b3-4e57ae435f85"
    },
    {
      "id": "chg_01a10514-28ce-7644-98e4-8c339c0f662c",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "get_trip",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "get_trip"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “get_trip” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28ce-7644-98e4-8c339c0f662c"
    },
    {
      "id": "chg_01a10514-28cf-756f-8154-af9968cd952b",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "list_accommodations",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "list_accommodations"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “list_accommodations” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28cf-756f-8154-af9968cd952b"
    },
    {
      "id": "chg_01a10514-28d1-7845-83b1-78bf0e31cb32",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "list_courses",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "list_courses"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “list_courses” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28d1-7845-83b1-78bf0e31cb32"
    },
    {
      "id": "chg_01a10514-28d3-76ba-8e46-377468300a0b",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "list_starting_dates",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "list_starting_dates"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “list_starting_dates” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28d3-76ba-8e46-377468300a0b"
    },
    {
      "id": "chg_01a10514-28d4-77af-b23a-79676f513ac4",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "request_discussion",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "request_discussion"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “request_discussion” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28d4-77af-b23a-79676f513ac4"
    },
    {
      "id": "chg_01a10514-28d7-71de-8d88-05b55c8695d3",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "request_quote",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "request_quote"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “request_quote” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28d7-71de-8d88-05b55c8695d3"
    },
    {
      "id": "chg_01a10514-28da-73e3-ba30-04cea73d25eb",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "save_trip",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "save_trip"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “save_trip” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28da-73e3-ba30-04cea73d25eb"
    },
    {
      "id": "chg_01a10514-28dc-7b45-8346-c551b8aa57a0",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "search_destinations",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "search_destinations"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “search_destinations” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28dc-7b45-8346-c551b8aa57a0"
    },
    {
      "id": "chg_01a10514-28de-7ae3-9c17-a53db8b41072",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "search_language_schools",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "search_language_schools"
      },
      "occurred_on": "2026-10-04",
      "occurred_at": "2026-10-04 04:02:49.600064+00",
      "observed_since": "2026-10-03",
      "source": "scan",
      "summary": "Tool “search_language_schools” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/com-extralingo-extralingo/www#chg-chg_01a10514-28de-7ae3-9c17-a53db8b41072"
    }
  ],
  "days": [
    {
      "date": "2026-11-02",
      "total": 81,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-11-01",
      "total": 81,
      "delta": 1,
      "tracked": true,
      "explained": false,
      "beyond_event_horizon": false,
      "attribution": {
        "category": "Stability & Change Management",
        "from": 93,
        "to": 97,
        "delta": 4,
        "others": [],
        "accrual": {
          "code": "stability.building_history",
          "from_days": 28,
          "to_days": 29
        },
        "partial": false,
        "compared_to": "2026-10-31",
        "summary": "No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes."
      },
      "event_count": 0
    },
    {
      "date": "2026-10-30",
      "total": 80,
      "delta": 1,
      "tracked": true,
      "explained": false,
      "beyond_event_horizon": false,
      "attribution": {
        "category": "Stability & Change Management",
        "from": 87,
        "to": 90,
        "delta": 3,
        "others": [],
        "accrual": {
          "code": "stability.building_history",
          "from_days": 26,
          "to_days": 27
        },
        "partial": false,
        "compared_to": "2026-10-29",
        "summary": "No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes."
      },
      "event_count": 0
    },
    {
      "date": "2026-10-28",
      "total": 79,
      "delta": 1,
      "tracked": true,
      "explained": false,
      "beyond_event_horizon": false,
      "attribution": {
        "category": "Stability & Change Management",
        "from": 80,
        "to": 83,
        "delta": 3,
        "others": [],
        "accrual": {
          "code": "stability.building_history",
          "from_days": 24,
          "to_days": 25
        },
        "partial": false,
        "compared_to": "2026-10-27",
        "summary": "No change was recorded against any check on this day. Stability & Change Management went from 80 to 83. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 25 at this one. The score rises as the window fills, whether or not the server changes."
      },
      "event_count": 0
    },
    {
      "date": "2026-10-26",
      "total": 78,
      "delta": 1,
      "tracked": true,
      "explained": false,
      "beyond_event_horizon": false,
      "attribution": {
        "category": "Stability & Change Management",
        "from": 73,
        "to": 77,
        "delta": 4,
        "others": [],
        "accrual": {
          "code": "stability.building_history",
          "from_days": 22,
          "to_days": 23
        },
        "partial": false,
        "compared_to": "2026-10-25",
        "summary": "No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes."
      },
      "event_count": 0
    },
    {
      "date": "2026-10-23",
      "total": 77,
      "delta": 1,
      "tracked": true,
      "explained": false,
      "beyond_event_horizon": false,
      "attribution": {
        "category": "Stability & Change Management",
        "from": 63,
        "to": 67,
        "delta": 4,
        "others": [],
        "accrual": {
          "code": "stability.building_history",
          "from_days": 19,
          "to_days": 20
        },
        "partial": false,
        "compared_to": "2026-10-22",
        "summary": "No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes."
      },
      "event_count": 0
    },
    {
      "date": "2026-10-21",
      "total": 76,
      "delta": 1,
      "tracked": true,
      "explained": false,
      "beyond_event_horizon": false,
      "attribution": {
        "category": "Stability & Change Management",
        "from": 57,
        "to": 60,
        "delta": 3,
        "others": [],
        "accrual": {
          "code": "stability.building_history",
          "from_days": 17,
          "to_days": 18
        },
        "partial": false,
        "compared_to": "2026-10-20",
        "summary": "No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes."
      },
      "event_count": 0
    },
    {
      "date": "2026-10-20",
      "total": 75,
      "delta": 10,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    }
  ]
}