{
  "$schema": "https://verifymcp.io/schemas/changelog.json",
  "server": "tax-terminal-filing",
  "component": "v1-hosted-mcp",
  "generated_at": "2026-11-05T10:50:24.587Z",
  "tracking_since": "2026-10-20",
  "counts": {
    "critical": 0,
    "security": 21,
    "functional": 0,
    "cosmetic": 0
  },
  "events": [
    {
      "id": "chg_01a17927-c82d-7a30-ad23-34f9356534a9",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "create_filing_session",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "create_filing_session"
      },
      "occurred_on": "2026-10-26",
      "occurred_at": "2026-10-26 17:00:12.667526+00",
      "observed_since": "2026-10-25",
      "source": "scan",
      "summary": "Tool “create_filing_session” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a17927-c82d-7a30-ad23-34f9356534a9"
    },
    {
      "id": "chg_01a17927-c831-7e44-86d1-0de1703d547a",
      "kind": "server.instructions_changed",
      "family": "",
      "subject_kind": "server",
      "subject": "instructions",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-10-26",
      "occurred_at": "2026-10-26 17:00:12.667526+00",
      "observed_since": "2026-10-25",
      "source": "scan",
      "summary": "The server rewrote its instructions, which are the text every model session reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a17927-c831-7e44-86d1-0de1703d547a"
    },
    {
      "id": "chg_01a177b1-5eea-7c22-b31c-97f0a0d2b497",
      "kind": "capture.status_changed",
      "family": "",
      "subject_kind": "server",
      "subject": "capture",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": "verified",
      "to_value": "auth_gated",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {
        "to": "auth_gated",
        "from": "verified"
      },
      "occurred_on": "2026-10-26",
      "occurred_at": "2026-10-26 10:11:15.237586+00",
      "observed_since": "2026-10-25",
      "source": "scan",
      "summary": "Endpoint reachability (reachable → behind authorisation)",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a177b1-5eea-7c22-b31c-97f0a0d2b497"
    },
    {
      "id": "chg_01a177b1-5ee6-7a9b-89e7-6b97fd7d53e6",
      "kind": "check.reason",
      "family": "auth-oauth",
      "subject_kind": "check",
      "subject": "auth-oauth",
      "subject_child": "",
      "from_code": "auth.none_destructive",
      "to_code": "auth.challenge_only",
      "from_value": "fail",
      "to_value": "fail",
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-10-26",
      "occurred_at": "2026-10-26 10:11:15.237586+00",
      "observed_since": "2026-10-25",
      "source": "scan",
      "summary": "Authorization (The endpoint enforces authorisation, but returns a challenge with no valid RFC 9728 metadata, so a client cannot discover where to get a token.)",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a177b1-5ee6-7a9b-89e7-6b97fd7d53e6"
    },
    {
      "id": "chg_01a177b1-5ed2-7976-950f-969166fdf8b8",
      "kind": "check.unverifiable",
      "family": "stability",
      "subject_kind": "check",
      "subject": "stability",
      "subject_child": "",
      "from_code": "stability.churn",
      "to_code": "stability.insufficient_history",
      "from_value": "fail",
      "to_value": "unverified",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-10-26",
      "occurred_at": "2026-10-26 10:11:15.237586+00",
      "observed_since": "2026-10-25",
      "source": "scan",
      "summary": "Stability (fail → unverified)",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a177b1-5ed2-7976-950f-969166fdf8b8"
    },
    {
      "id": "chg_01a177b1-5ed6-7761-a36a-81dda1a2a7b2",
      "kind": "check.unverifiable",
      "family": "tool-safety-injection",
      "subject_kind": "check",
      "subject": "tool-safety-injection",
      "subject_child": "",
      "from_code": "toolsafety.injection_clean",
      "to_code": "toolsafety.auth_gated",
      "from_value": "pass",
      "to_value": "unverified",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-10-26",
      "occurred_at": "2026-10-26 10:11:15.237586+00",
      "observed_since": "2026-10-25",
      "source": "scan",
      "summary": "Tool safety (pass → unverified)",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a177b1-5ed6-7761-a36a-81dda1a2a7b2"
    },
    {
      "id": "chg_01a177b1-5ed8-71a4-b565-36146f5df0c1",
      "kind": "check.unverifiable",
      "family": "transport",
      "subject_kind": "check",
      "subject": "transport",
      "subject_child": "",
      "from_code": "transport.verified",
      "to_code": "transport.auth_gated",
      "from_value": "pass",
      "to_value": "unverified",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {
        "transport": "streamable-http"
      },
      "occurred_on": "2026-10-26",
      "occurred_at": "2026-10-26 10:11:15.237586+00",
      "observed_since": "2026-10-25",
      "source": "scan",
      "summary": "Transport (pass → unverified)",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a177b1-5ed8-71a4-b565-36146f5df0c1"
    },
    {
      "id": "chg_01a177b1-5eda-7dba-96e0-b8c49938388d",
      "kind": "check.verdict",
      "family": "hsts",
      "subject_kind": "check",
      "subject": "hsts",
      "subject_child": "",
      "from_code": "headers.hsts_present",
      "to_code": "headers.hsts_absent",
      "from_value": "pass",
      "to_value": "fail",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-10-26",
      "occurred_at": "2026-10-26 10:11:15.237586+00",
      "observed_since": "2026-10-25",
      "source": "scan",
      "summary": "HSTS header (pass → fail)",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a177b1-5eda-7dba-96e0-b8c49938388d"
    },
    {
      "id": "chg_01a16d64-2a47-7291-9385-b0a297512459",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "continue_filing_session",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "continue_filing_session"
      },
      "occurred_on": "2026-10-24",
      "occurred_at": "2026-10-24 10:10:43.37232+00",
      "observed_since": "2026-10-23",
      "source": "scan",
      "summary": "Tool “continue_filing_session” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a16d64-2a47-7291-9385-b0a297512459"
    },
    {
      "id": "chg_01a16d64-2a47-7d5c-83c9-5eaf1287296c",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "create_filing_session",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "create_filing_session"
      },
      "occurred_on": "2026-10-24",
      "occurred_at": "2026-10-24 10:10:43.37232+00",
      "observed_since": "2026-10-23",
      "source": "scan",
      "summary": "Tool “create_filing_session” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a16d64-2a47-7d5c-83c9-5eaf1287296c"
    },
    {
      "id": "chg_01a16d64-2a48-7a1b-94ce-9a58edaefcee",
      "kind": "server.instructions_changed",
      "family": "",
      "subject_kind": "server",
      "subject": "instructions",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-10-24",
      "occurred_at": "2026-10-24 10:10:43.37232+00",
      "observed_since": "2026-10-23",
      "source": "scan",
      "summary": "The server rewrote its instructions, which are the text every model session reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a16d64-2a48-7a1b-94ce-9a58edaefcee"
    },
    {
      "id": "chg_01a1683d-f04f-7eba-a371-800528bee8b9",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "continue_filing_session",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "continue_filing_session"
      },
      "occurred_on": "2026-10-23",
      "occurred_at": "2026-10-23 10:10:52.050156+00",
      "observed_since": "2026-10-22",
      "source": "scan",
      "summary": "Tool “continue_filing_session” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a1683d-f04f-7eba-a371-800528bee8b9"
    },
    {
      "id": "chg_01a1683d-f058-7eed-a8f0-87e0b5a3c82b",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "create_filing_session",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "create_filing_session"
      },
      "occurred_on": "2026-10-23",
      "occurred_at": "2026-10-23 10:10:52.050156+00",
      "observed_since": "2026-10-22",
      "source": "scan",
      "summary": "Tool “create_filing_session” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a1683d-f058-7eed-a8f0-87e0b5a3c82b"
    },
    {
      "id": "chg_01a1683d-f05c-7808-b025-f9f5040b761a",
      "kind": "server.instructions_changed",
      "family": "",
      "subject_kind": "server",
      "subject": "instructions",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-10-23",
      "occurred_at": "2026-10-23 10:10:52.050156+00",
      "observed_since": "2026-10-22",
      "source": "scan",
      "summary": "The server rewrote its instructions, which are the text every model session reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a1683d-f05c-7808-b025-f9f5040b761a"
    },
    {
      "id": "chg_01a16317-f519-78f9-8308-9865c8f6837a",
      "kind": "check.verdict",
      "family": "stability",
      "subject_kind": "check",
      "subject": "stability",
      "subject_child": "",
      "from_code": "stability.building_history",
      "to_code": "stability.churn",
      "from_value": "0.03",
      "to_value": "fail",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {
        "days": "2",
        "added": "0",
        "breaks": "0",
        "removed": "1",
        "auth_transport": "0"
      },
      "occurred_on": "2026-10-22",
      "occurred_at": "2026-10-22 10:11:16.869383+00",
      "observed_since": "2026-10-21",
      "source": "scan",
      "summary": "Stability (0.03 → fail)",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a16317-f519-78f9-8308-9865c8f6837a"
    },
    {
      "id": "chg_01a16317-f51b-7366-b1d4-46727608e543",
      "kind": "tool.removed",
      "family": "",
      "subject_kind": "tool",
      "subject": "get_filing_status",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {
        "tool": "get_filing_status"
      },
      "occurred_on": "2026-10-22",
      "occurred_at": "2026-10-22 10:11:16.869383+00",
      "observed_since": "2026-10-21",
      "source": "scan",
      "summary": "Tool “get_filing_status” was removed",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a16317-f51b-7366-b1d4-46727608e543"
    },
    {
      "id": "chg_01a16317-f51b-7c7e-88f2-4a8c78a53fc8",
      "kind": "server.instructions_changed",
      "family": "",
      "subject_kind": "server",
      "subject": "instructions",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-10-22",
      "occurred_at": "2026-10-22 10:11:16.869383+00",
      "observed_since": "2026-10-21",
      "source": "scan",
      "summary": "The server rewrote its instructions, which are the text every model session reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a16317-f51b-7c7e-88f2-4a8c78a53fc8"
    },
    {
      "id": "chg_01a15ca4-e44a-7c2a-9ae7-f88cded2dc3a",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "get_filing_status",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "get_filing_status"
      },
      "occurred_on": "2026-10-21",
      "occurred_at": "2026-10-21 04:07:52.623196+00",
      "observed_since": "2026-10-20",
      "source": "scan",
      "summary": "Tool “get_filing_status” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a15ca4-e44a-7c2a-9ae7-f88cded2dc3a"
    },
    {
      "id": "chg_01a15ca4-e448-7e48-a210-ad51155ca5dd",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "continue_filing_session",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "continue_filing_session"
      },
      "occurred_on": "2026-10-21",
      "occurred_at": "2026-10-21 04:07:52.623196+00",
      "observed_since": "2026-10-20",
      "source": "scan",
      "summary": "Tool “continue_filing_session” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a15ca4-e448-7e48-a210-ad51155ca5dd"
    },
    {
      "id": "chg_01a15ca4-e449-74bd-96ac-8d4ad6996279",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "create_filing_session",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "create_filing_session"
      },
      "occurred_on": "2026-10-21",
      "occurred_at": "2026-10-21 04:07:52.623196+00",
      "observed_since": "2026-10-20",
      "source": "scan",
      "summary": "Tool “create_filing_session” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a15ca4-e449-74bd-96ac-8d4ad6996279"
    },
    {
      "id": "chg_01a15ca4-e44b-7763-bcad-bfaf3990e2f1",
      "kind": "server.instructions_changed",
      "family": "",
      "subject_kind": "server",
      "subject": "instructions",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-10-21",
      "occurred_at": "2026-10-21 04:07:52.623196+00",
      "observed_since": "2026-10-20",
      "source": "scan",
      "summary": "The server rewrote its instructions, which are the text every model session reads",
      "link": "https://verifymcp.io/servers/tax-terminal-filing/v1-hosted-mcp#chg-chg_01a15ca4-e44b-7763-bcad-bfaf3990e2f1"
    }
  ],
  "days": [
    {
      "date": "2026-11-04",
      "total": 67,
      "delta": 1,
      "tracked": true,
      "explained": false,
      "beyond_event_horizon": false,
      "attribution": {
        "category": "Stability & Change Management",
        "from": 22,
        "to": 25,
        "delta": 3,
        "others": [],
        "accrual": null,
        "partial": false,
        "compared_to": "2026-11-03",
        "summary": "No change was recorded against any check on this day. Stability & Change Management went from 22 to 25."
      },
      "event_count": 0
    },
    {
      "date": "2026-11-02",
      "total": 66,
      "delta": 1,
      "tracked": true,
      "explained": false,
      "beyond_event_horizon": false,
      "attribution": {
        "category": "Stability & Change Management",
        "from": 15,
        "to": 18,
        "delta": 3,
        "others": [],
        "accrual": null,
        "partial": false,
        "compared_to": "2026-11-01",
        "summary": "No change was recorded against any check on this day. Stability & Change Management went from 15 to 18."
      },
      "event_count": 0
    },
    {
      "date": "2026-11-01",
      "total": 65,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-10-31",
      "total": 65,
      "delta": 1,
      "tracked": true,
      "explained": false,
      "beyond_event_horizon": false,
      "attribution": {
        "category": "Stability & Change Management",
        "from": 8,
        "to": 12,
        "delta": 4,
        "others": [],
        "accrual": null,
        "partial": false,
        "compared_to": "2026-10-30",
        "summary": "No change was recorded against any check on this day. Stability & Change Management went from 8 to 12."
      },
      "event_count": 0
    },
    {
      "date": "2026-10-29",
      "total": 64,
      "delta": 1,
      "tracked": true,
      "explained": false,
      "beyond_event_horizon": false,
      "attribution": {
        "category": "Stability & Change Management",
        "from": 2,
        "to": 5,
        "delta": 3,
        "others": [],
        "accrual": null,
        "partial": false,
        "compared_to": "2026-10-28",
        "summary": "No change was recorded against any check on this day. Stability & Change Management went from 2 to 5."
      },
      "event_count": 0
    },
    {
      "date": "2026-10-26",
      "total": 63,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 13
    },
    {
      "date": "2026-10-25",
      "total": 63,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-10-24",
      "total": 63,
      "delta": 1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 5
    }
  ]
}