{
  "$schema": "https://verifymcp.io/schemas/changelog.json",
  "server": "cyanheads-medical-codes-mcp-server",
  "component": "medical-codes",
  "generated_at": "2026-09-29T00:36:56.573Z",
  "tracking_since": "2026-07-26",
  "counts": {
    "critical": 0,
    "security": 19,
    "functional": 0,
    "cosmetic": 0
  },
  "events": [
    {
      "id": "chg_01a0d56e-ece0-7915-a8d8-d9feba1ee900",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "medcode_list_systems",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "medcode_list_systems"
      },
      "occurred_on": "2026-09-24",
      "occurred_at": "2026-09-24 22:00:10.581371+00",
      "observed_since": "2026-09-24",
      "source": "scan",
      "summary": "Tool “medcode_list_systems” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_01a0d56e-ece0-7915-a8d8-d9feba1ee900"
    },
    {
      "id": "chg_01a0d4ca-2046-7ca1-a4af-402acc2f0d93",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "medcode_search_codes",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "medcode_search_codes"
      },
      "occurred_on": "2026-09-24",
      "occurred_at": "2026-09-24 19:00:10.230774+00",
      "observed_since": "2026-09-24",
      "source": "scan",
      "summary": "Tool “medcode_search_codes” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_01a0d4ca-2046-7ca1-a4af-402acc2f0d93"
    },
    {
      "id": "chg_01a0d4ca-204e-71b6-86a7-fcb8d3ccec51",
      "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": "2026-09-24",
      "occurred_at": "2026-09-24 19:00:10.230774+00",
      "observed_since": "2026-09-24",
      "source": "scan",
      "summary": "The server rewrote its instructions, which are the text every model session reads",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_01a0d4ca-204e-71b6-86a7-fcb8d3ccec51"
    },
    {
      "id": "chg_01a0d4ca-2034-784e-a7d6-0bfac6d92683",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "medcode_check_code",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "medcode_check_code"
      },
      "occurred_on": "2026-09-24",
      "occurred_at": "2026-09-24 19:00:10.230774+00",
      "observed_since": "2026-09-24",
      "source": "scan",
      "summary": "Tool “medcode_check_code” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_01a0d4ca-2034-784e-a7d6-0bfac6d92683"
    },
    {
      "id": "chg_01a0d4ca-2038-7ca3-a686-fdef873fbd66",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "medcode_get_code",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "medcode_get_code"
      },
      "occurred_on": "2026-09-24",
      "occurred_at": "2026-09-24 19:00:10.230774+00",
      "observed_since": "2026-09-24",
      "source": "scan",
      "summary": "Tool “medcode_get_code” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_01a0d4ca-2038-7ca3-a686-fdef873fbd66"
    },
    {
      "id": "chg_01a0d4ca-203a-7a06-a926-74082db78ca2",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "medcode_map_codes",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "medcode_map_codes"
      },
      "occurred_on": "2026-09-24",
      "occurred_at": "2026-09-24 19:00:10.230774+00",
      "observed_since": "2026-09-24",
      "source": "scan",
      "summary": "Tool “medcode_map_codes” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_01a0d4ca-203a-7a06-a926-74082db78ca2"
    },
    {
      "id": "chg_01a083e9-7777-71c4-a897-734a35f2ed61",
      "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": "2026-09-09",
      "occurred_at": "2026-09-09 02:05:10.838083+00",
      "observed_since": "2026-09-08",
      "source": "scan",
      "summary": "Stability (0.97 → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_01a083e9-7777-71c4-a897-734a35f2ed61"
    },
    {
      "id": "chg_01a036a9-82b3-7337-b643-6e4a95c5d69c",
      "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": "2026-08-25",
      "occurred_at": "2026-08-25 02:04:33.770955+00",
      "observed_since": "2026-08-24",
      "source": "scan",
      "summary": "Stability (0.97 → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_01a036a9-82b3-7337-b643-6e4a95c5d69c"
    },
    {
      "id": "chg_019fe969-d922-7bc5-b1c4-28b2e680deff",
      "kind": "check.verdict",
      "family": "hsts",
      "subject_kind": "check",
      "subject": "hsts",
      "subject_child": "",
      "from_code": "headers.hsts_absent",
      "to_code": "headers.hsts_present",
      "from_value": "fail",
      "to_value": "pass",
      "materiality": "security",
      "direction": "improvement",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-08-10",
      "occurred_at": "2026-08-10 02:04:15.975531+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "HSTS header (fail → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_019fe969-d922-7bc5-b1c4-28b2e680deff"
    },
    {
      "id": "chg_019fe969-d923-7f1a-bdb4-67b6f548f446",
      "kind": "check.verdict",
      "family": "transport",
      "subject_kind": "check",
      "subject": "transport",
      "subject_child": "",
      "from_code": "transport.http_error",
      "to_code": "transport.verified",
      "from_value": "fail",
      "to_value": "pass",
      "materiality": "security",
      "direction": "improvement",
      "score_delta": null,
      "detail": {
        "transport": "streamable-http"
      },
      "occurred_on": "2026-08-10",
      "occurred_at": "2026-08-10 02:04:15.975531+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "Transport (fail → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_019fe969-d923-7f1a-bdb4-67b6f548f446"
    },
    {
      "id": "chg_019fe969-d924-7461-983d-006c2464307b",
      "kind": "check.reason",
      "family": "auth-oauth",
      "subject_kind": "check",
      "subject": "auth-oauth",
      "subject_child": "",
      "from_code": "auth.none_unlisted",
      "to_code": "auth.none_undeclared",
      "from_value": "unverified",
      "to_value": "unverified",
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "auth": "none",
        "undeclared_tools": "6"
      },
      "occurred_on": "2026-08-10",
      "occurred_at": "2026-08-10 02:04:15.975531+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "Authorization (Authorisation not fully verified: no authorisation is required to call this server, and 6 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.)",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_019fe969-d924-7461-983d-006c2464307b"
    },
    {
      "id": "chg_019fe969-d926-70a8-8357-89c312b65416",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "medcode_check_code",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "medcode_check_code"
      },
      "occurred_on": "2026-08-10",
      "occurred_at": "2026-08-10 02:04:15.975531+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Tool “medcode_check_code” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_019fe969-d926-70a8-8357-89c312b65416"
    },
    {
      "id": "chg_019fe969-d926-77a4-9622-14f2e8900daf",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "medcode_get_code",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "medcode_get_code"
      },
      "occurred_on": "2026-08-10",
      "occurred_at": "2026-08-10 02:04:15.975531+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Tool “medcode_get_code” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_019fe969-d926-77a4-9622-14f2e8900daf"
    },
    {
      "id": "chg_019fe969-d927-786e-8e91-ab66abd0a6a4",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "medcode_map_codes",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "medcode_map_codes"
      },
      "occurred_on": "2026-08-10",
      "occurred_at": "2026-08-10 02:04:15.975531+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Tool “medcode_map_codes” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_019fe969-d927-786e-8e91-ab66abd0a6a4"
    },
    {
      "id": "chg_019fdf1c-ff14-74b5-9aa1-a45bd9a547bf",
      "kind": "check.reason",
      "family": "auth-oauth",
      "subject_kind": "check",
      "subject": "auth-oauth",
      "subject_child": "",
      "from_code": "auth.none_undeclared",
      "to_code": "auth.none_unlisted",
      "from_value": "unverified",
      "to_value": "unverified",
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-08-08",
      "occurred_at": "2026-08-08 02:04:07.258788+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Authorization (Authorisation not fully verified: no authorisation is required to connect, but we couldn't read the whole tool list to see what that exposes.)",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_019fdf1c-ff14-74b5-9aa1-a45bd9a547bf"
    },
    {
      "id": "chg_019fdf1c-ff17-789b-9179-8e5350c90d28",
      "kind": "capture.status_changed",
      "family": "",
      "subject_kind": "server",
      "subject": "capture",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": "verified",
      "to_value": "not_mcp",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {
        "to": "not_mcp",
        "from": "verified"
      },
      "occurred_on": "2026-08-08",
      "occurred_at": "2026-08-08 02:04:07.258788+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Endpoint reachability (reachable → not serving MCP)",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_019fdf1c-ff17-789b-9179-8e5350c90d28"
    },
    {
      "id": "chg_019fdf1c-ff13-7a6e-bf7a-de655aac5039",
      "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": "2026-08-08",
      "occurred_at": "2026-08-08 02:04:07.258788+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "HSTS header (pass → fail)",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_019fdf1c-ff13-7a6e-bf7a-de655aac5039"
    },
    {
      "id": "chg_019fdf1c-ff13-7429-9d3f-fdfafde3fb99",
      "kind": "check.unverifiable",
      "family": "stability",
      "subject_kind": "check",
      "subject": "stability",
      "subject_child": "",
      "from_code": "stability.building_history",
      "to_code": "stability.insufficient_history",
      "from_value": "0.40",
      "to_value": "unverified",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-08-08",
      "occurred_at": "2026-08-08 02:04:07.258788+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Stability (0.40 → unverified)",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_019fdf1c-ff13-7429-9d3f-fdfafde3fb99"
    },
    {
      "id": "chg_019fdf1c-ff12-7276-8662-abc0879b5091",
      "kind": "check.verdict",
      "family": "transport",
      "subject_kind": "check",
      "subject": "transport",
      "subject_child": "",
      "from_code": "transport.verified",
      "to_code": "transport.http_error",
      "from_value": "pass",
      "to_value": "fail",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {
        "status": "530",
        "transport": "streamable-http"
      },
      "occurred_on": "2026-08-08",
      "occurred_at": "2026-08-08 02:04:07.258788+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Transport (pass → fail)",
      "link": "https://verifymcp.io/servers/cyanheads-medical-codes-mcp-server/medical-codes#chg-chg_019fdf1c-ff12-7276-8662-abc0879b5091"
    }
  ],
  "days": [
    {
      "date": "2026-09-28",
      "total": 86,
      "delta": 7,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-25",
      "total": 79,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-24",
      "total": 79,
      "delta": -1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 24
    },
    {
      "date": "2026-09-19",
      "total": 80,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-09",
      "total": 80,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-08",
      "total": 80,
      "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": "2026-09-07",
        "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": "2026-09-07",
      "total": 79,
      "delta": -1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-08-26",
      "total": 0,
      "delta": null,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    }
  ]
}