{
  "$schema": "https://verifymcp.io/schemas/changelog.json",
  "server": "cyanheads-clinicaltrialsgov-mcp-server",
  "component": "clinicaltrials",
  "generated_at": "2026-09-22T00:33:19.577Z",
  "tracking_since": "2026-07-26",
  "counts": {
    "critical": 0,
    "security": 13,
    "functional": 0,
    "cosmetic": 0
  },
  "events": [
    {
      "id": "chg_01a096fd-ef8b-7ca8-915e-42c2d651348c",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "clinicaltrials_get_study_results",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "clinicaltrials_get_study_results"
      },
      "occurred_on": "2026-09-12",
      "occurred_at": "2026-09-12 19:00:19.409318+00",
      "observed_since": "2026-09-12",
      "source": "scan",
      "summary": "Tool “clinicaltrials_get_study_results” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_01a096fd-ef8b-7ca8-915e-42c2d651348c"
    },
    {
      "id": "chg_01a083e9-722a-72fb-8d7c-3507ce341c18",
      "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 02:05:09.479425+00",
      "observed_since": "2026-09-08",
      "source": "scan",
      "summary": "Stability (0.97 → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_01a083e9-722a-72fb-8d7c-3507ce341c18"
    },
    {
      "id": "chg_01a036a9-777a-78f1-bcb8-f5ca5b21bbd8",
      "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 02:04:30.868589+00",
      "observed_since": "2026-08-24",
      "source": "scan",
      "summary": "Stability (0.97 → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_01a036a9-777a-78f1-bcb8-f5ca5b21bbd8"
    },
    {
      "id": "chg_01a015d0-fb9a-76c2-906a-82e207e4f440",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "clinicaltrials_find_eligible",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "clinicaltrials_find_eligible"
      },
      "occurred_on": "2026-08-18",
      "occurred_at": "2026-08-18 17:00:12.508035+00",
      "observed_since": "2026-08-18",
      "source": "scan",
      "summary": "Tool “clinicaltrials_find_eligible” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_01a015d0-fb9a-76c2-906a-82e207e4f440"
    },
    {
      "id": "chg_01a015d0-fb9c-7027-91a8-c5f4e13e759f",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "clinicaltrials_get_study_results",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "clinicaltrials_get_study_results"
      },
      "occurred_on": "2026-08-18",
      "occurred_at": "2026-08-18 17:00:12.508035+00",
      "observed_since": "2026-08-18",
      "source": "scan",
      "summary": "Tool “clinicaltrials_get_study_results” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_01a015d0-fb9c-7027-91a8-c5f4e13e759f"
    },
    {
      "id": "chg_019fe969-c922-7c87-8da7-5f4065c5b033",
      "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": "7"
      },
      "occurred_on": "2026-08-10",
      "occurred_at": "2026-08-10 02:04:11.891535+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "Authorization (Authorisation not fully verified: no authorisation is required to call this server, and 7 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-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_019fe969-c922-7c87-8da7-5f4065c5b033"
    },
    {
      "id": "chg_019fe969-c922-757d-9674-93168f21e1bc",
      "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 02:04:11.891535+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "Transport (fail → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_019fe969-c922-757d-9674-93168f21e1bc"
    },
    {
      "id": "chg_019fe969-c921-73bd-a27c-57c00c89595c",
      "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 02:04:11.891535+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "HSTS header (fail → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_019fe969-c921-73bd-a27c-57c00c89595c"
    },
    {
      "id": "chg_019fdf1d-00a2-7e2c-83e9-b22d295c6a3a",
      "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 02:04:07.652417+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "HSTS header (pass → fail)",
      "link": "https://verifymcp.io/servers/cyanheads-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_019fdf1d-00a2-7e2c-83e9-b22d295c6a3a"
    },
    {
      "id": "chg_019fdf1d-00a5-7a97-85ce-1bd69fcd40aa",
      "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 02:04:07.652417+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Endpoint reachability (reachable → not serving MCP)",
      "link": "https://verifymcp.io/servers/cyanheads-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_019fdf1d-00a5-7a97-85ce-1bd69fcd40aa"
    },
    {
      "id": "chg_019fdf1d-00a3-745e-a4a2-dca6bed358d4",
      "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 02:04:07.652417+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-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_019fdf1d-00a3-745e-a4a2-dca6bed358d4"
    },
    {
      "id": "chg_019fdf1d-00a2-784c-a5e1-89c6b9bd6eea",
      "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 02:04:07.652417+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Stability (0.40 → unverified)",
      "link": "https://verifymcp.io/servers/cyanheads-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_019fdf1d-00a2-784c-a5e1-89c6b9bd6eea"
    },
    {
      "id": "chg_019fdf1d-00a1-77b8-9c14-f7fb9e899c75",
      "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 02:04:07.652417+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Transport (pass → fail)",
      "link": "https://verifymcp.io/servers/cyanheads-clinicaltrialsgov-mcp-server/clinicaltrials#chg-chg_019fdf1d-00a1-77b8-9c14-f7fb9e899c75"
    }
  ],
  "days": [
    {
      "date": "2026-09-18",
      "total": 82,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-13",
      "total": 82,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-12",
      "total": 82,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 10
    },
    {
      "date": "2026-09-09",
      "total": 82,
      "delta": 1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-07",
      "total": 81,
      "delta": -1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-03",
      "total": 82,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-08-26",
      "total": 82,
      "delta": 1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-08-25",
      "total": 81,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    }
  ]
}