{
  "$schema": "https://verifymcp.io/schemas/changelog.json",
  "server": "cyanheads-cdc-health-mcp-server",
  "component": "cdc",
  "generated_at": "2026-09-22T05:45:15.870Z",
  "tracking_since": "2026-07-26",
  "counts": {
    "critical": 0,
    "security": 16,
    "functional": 0,
    "cosmetic": 0
  },
  "events": [
    {
      "id": "chg_01a0c144-8c43-7b49-9d22-39aed3328486",
      "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": "2026-09-21",
      "occurred_at": "2026-09-21 00:01:30.086371+00",
      "observed_since": "2026-09-20",
      "source": "scan",
      "summary": "The server rewrote its instructions, which are the text every model session reads",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_01a0c144-8c43-7b49-9d22-39aed3328486"
    },
    {
      "id": "chg_01a083ef-e37e-7388-ac3d-e114ed68ac38",
      "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 02:12:11.684499+00",
      "observed_since": "2026-09-08",
      "source": "scan",
      "summary": "Stability (0.97 → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_01a083ef-e37e-7388-ac3d-e114ed68ac38"
    },
    {
      "id": "chg_01a036ae-7076-7c36-b210-23238fe0665b",
      "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 02:09:56.772915+00",
      "observed_since": "2026-08-24",
      "source": "scan",
      "summary": "Stability (0.97 → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_01a036ae-7076-7c36-b210-23238fe0665b"
    },
    {
      "id": "chg_01a0141c-4110-7b89-b9fb-e6de15cf90e5",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "cdc_get_dataset_schema",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "cdc_get_dataset_schema"
      },
      "occurred_on": "2026-08-18",
      "occurred_at": "2026-08-18 09:03:11.031653+00",
      "observed_since": "2026-08-18",
      "source": "scan",
      "summary": "Tool “cdc_get_dataset_schema” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_01a0141c-4110-7b89-b9fb-e6de15cf90e5"
    },
    {
      "id": "chg_01a0141c-4115-782c-ad03-0d686e62ceb1",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "cdc_query_wonder",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "cdc_query_wonder"
      },
      "occurred_on": "2026-08-18",
      "occurred_at": "2026-08-18 09:03:11.031653+00",
      "observed_since": "2026-08-18",
      "source": "scan",
      "summary": "Tool “cdc_query_wonder” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_01a0141c-4115-782c-ad03-0d686e62ceb1"
    },
    {
      "id": "chg_019fe96a-b928-7abd-9d66-bc12be47fd64",
      "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": "4"
      },
      "occurred_on": "2026-08-10",
      "occurred_at": "2026-08-10 02:05:13.340946+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "Authorization (Authorisation not fully verified: no authorisation is required to call this server, and 4 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-cdc-health-mcp-server/cdc#chg-chg_019fe96a-b928-7abd-9d66-bc12be47fd64"
    },
    {
      "id": "chg_019fe96a-b928-72e8-986f-d3b0766d5e4d",
      "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 02:05:13.340946+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "Transport (fail → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_019fe96a-b928-72e8-986f-d3b0766d5e4d"
    },
    {
      "id": "chg_019fe96a-b927-763b-ad11-28b840764354",
      "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 02:05:13.340946+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "HSTS header (fail → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_019fe96a-b927-763b-ad11-28b840764354"
    },
    {
      "id": "chg_019fe96a-b932-7e66-989f-ea3c927a9a79",
      "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": "2026-08-10",
      "occurred_at": "2026-08-10 02:05:13.340946+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "The server rewrote its instructions, which are the text every model session reads",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_019fe96a-b932-7e66-989f-ea3c927a9a79"
    },
    {
      "id": "chg_019fe96a-b92f-74fa-93aa-d3918303e3ed",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "cdc_query_wonder",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "cdc_query_wonder"
      },
      "occurred_on": "2026-08-10",
      "occurred_at": "2026-08-10 02:05:13.340946+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Tool “cdc_query_wonder” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_019fe96a-b92f-74fa-93aa-d3918303e3ed"
    },
    {
      "id": "chg_019fe96a-b92b-7e0c-b344-f47dc7dc8de3",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "cdc_discover_datasets",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "cdc_discover_datasets"
      },
      "occurred_on": "2026-08-10",
      "occurred_at": "2026-08-10 02:05:13.340946+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Tool “cdc_discover_datasets” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_019fe96a-b92b-7e0c-b344-f47dc7dc8de3"
    },
    {
      "id": "chg_019fdf1d-0292-710b-93ec-1f38aa0d4978",
      "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 02:04:08.177999+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "HSTS header (pass → fail)",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_019fdf1d-0292-710b-93ec-1f38aa0d4978"
    },
    {
      "id": "chg_019fdf1d-0293-79b9-8b6e-dfc844044c00",
      "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 02:04:08.177999+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Endpoint reachability (reachable → not serving MCP)",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_019fdf1d-0293-79b9-8b6e-dfc844044c00"
    },
    {
      "id": "chg_019fdf1d-0292-771d-80d8-e83ca0e46516",
      "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 02:04:08.177999+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 tool list to see what that exposes.)",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_019fdf1d-0292-771d-80d8-e83ca0e46516"
    },
    {
      "id": "chg_019fdf1d-0291-7c35-a51f-255e0e511e91",
      "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 02:04:08.177999+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Stability (0.40 → unverified)",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_019fdf1d-0291-7c35-a51f-255e0e511e91"
    },
    {
      "id": "chg_019fdf1d-0291-72c5-b35e-368b63f56c14",
      "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 02:04:08.177999+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Transport (pass → fail)",
      "link": "https://verifymcp.io/servers/cyanheads-cdc-health-mcp-server/cdc#chg-chg_019fdf1d-0291-72c5-b35e-368b63f56c14"
    }
  ],
  "days": [
    {
      "date": "2026-09-21",
      "total": 81,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 6
    },
    {
      "date": "2026-09-16",
      "total": 81,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-09",
      "total": 81,
      "delta": 1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-07",
      "total": 80,
      "delta": -1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-08-26",
      "total": 81,
      "delta": -1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-08-25",
      "total": 82,
      "delta": 1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-08-22",
      "total": 0,
      "delta": null,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 3
    },
    {
      "date": "2026-08-18",
      "total": 0,
      "delta": null,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 11
    }
  ]
}