{
  "$schema": "https://verifymcp.io/schemas/changelog.json",
  "server": "cyanheads-pubchem-mcp-server",
  "component": "pubchem",
  "generated_at": "2026-09-21T00:30:15.761Z",
  "tracking_since": "2026-07-26",
  "counts": {
    "critical": 0,
    "security": 16,
    "functional": 0,
    "cosmetic": 0
  },
  "events": [
    {
      "id": "chg_01a0852f-3261-71bb-9af3-96e4e20ba61b",
      "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 08:00:57.87329+00",
      "observed_since": "2026-09-08",
      "source": "scan",
      "summary": "Stability (0.97 → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_01a0852f-3261-71bb-9af3-96e4e20ba61b"
    },
    {
      "id": "chg_01a0423c-e3eb-7bfd-8534-998550d595a7",
      "kind": "check.verdict",
      "family": "stability",
      "subject_kind": "check",
      "subject": "stability",
      "subject_child": "",
      "from_code": "stability.churn",
      "to_code": "stability.stable",
      "from_value": "fail",
      "to_value": "pass",
      "materiality": "security",
      "direction": "improvement",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-08-27",
      "occurred_at": "2026-08-27 08:01:21.833289+00",
      "observed_since": "2026-08-26",
      "source": "scan",
      "summary": "Stability (fail → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_01a0423c-e3eb-7bfd-8534-998550d595a7"
    },
    {
      "id": "chg_019feab4-d626-77b8-9f14-5f4933bd02d5",
      "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": "10"
      },
      "occurred_on": "2026-08-10",
      "occurred_at": "2026-08-10 08:05:47.586576+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "Authorization (Authorisation not fully verified: no authorisation is required to call this server, and 10 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-pubchem-mcp-server/pubchem#chg-chg_019feab4-d626-77b8-9f14-5f4933bd02d5"
    },
    {
      "id": "chg_019feab4-d626-7310-b8b4-8f841c192b3f",
      "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 08:05:47.586576+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "Transport (fail → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_019feab4-d626-7310-b8b4-8f841c192b3f"
    },
    {
      "id": "chg_019feab4-d625-7cb1-9f8b-85331fab3f8c",
      "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 08:05:47.586576+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "HSTS header (fail → pass)",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_019feab4-d625-7cb1-9f8b-85331fab3f8c"
    },
    {
      "id": "chg_019feab4-d624-7c9f-8c94-bb0bb60f6f45",
      "kind": "check.reverified",
      "family": "stability",
      "subject_kind": "check",
      "subject": "stability",
      "subject_child": "",
      "from_code": "stability.insufficient_history",
      "to_code": "stability.churn",
      "from_value": "unverified",
      "to_value": "fail",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {
        "days": "15",
        "added": "0",
        "breaks": "4",
        "removed": "0",
        "auth_transport": "0"
      },
      "occurred_on": "2026-08-10",
      "occurred_at": "2026-08-10 08:05:47.586576+00",
      "observed_since": "2026-08-09",
      "source": "scan",
      "summary": "Stability (unverified → fail)",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_019feab4-d624-7c9f-8c94-bb0bb60f6f45"
    },
    {
      "id": "chg_019fe067-f510-7663-8e5f-88405b55a3af",
      "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 08:05:37.151675+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Endpoint reachability (reachable → not serving MCP)",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_019fe067-f510-7663-8e5f-88405b55a3af"
    },
    {
      "id": "chg_019fe067-f50e-787b-8f50-db3bf4540599",
      "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 08:05:37.151675+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "HSTS header (pass → fail)",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_019fe067-f50e-787b-8f50-db3bf4540599"
    },
    {
      "id": "chg_019fe067-f50e-7d34-bd7e-bb1a9a84975a",
      "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 08:05:37.151675+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-pubchem-mcp-server/pubchem#chg-chg_019fe067-f50e-7d34-bd7e-bb1a9a84975a"
    },
    {
      "id": "chg_019fe067-f50e-71b3-bbfe-d095600459c5",
      "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 08:05:37.151675+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Transport (pass → fail)",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_019fe067-f50e-71b3-bbfe-d095600459c5"
    },
    {
      "id": "chg_019fe067-f50d-7188-b40f-c68154425c47",
      "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": "2026-08-08",
      "occurred_at": "2026-08-08 08:05:37.151675+00",
      "observed_since": "2026-08-07",
      "source": "scan",
      "summary": "Stability (fail → unverified)",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_019fe067-f50d-7188-b40f-c68154425c47"
    },
    {
      "id": "chg_019fa9af-4db9-77d9-be97-57865aecdfd8",
      "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": "4",
        "removed": "0",
        "auth_transport": "0"
      },
      "occurred_on": "2026-07-28",
      "occurred_at": "2026-07-28 17:04:26.031623+00",
      "observed_since": "2026-07-27",
      "source": "scan",
      "summary": "Stability (0.03 → fail)",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_019fa9af-4db9-77d9-be97-57865aecdfd8"
    },
    {
      "id": "chg_019fa9af-4dbb-73bb-90a8-7f7dae54ba6a",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "pubchem_get_compound_interactions",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "pubchem_get_compound_interactions"
      },
      "occurred_on": "2026-07-28",
      "occurred_at": "2026-07-28 17:04:26.031623+00",
      "observed_since": "2026-07-28",
      "source": "scan",
      "summary": "Tool “pubchem_get_compound_interactions” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_019fa9af-4dbb-73bb-90a8-7f7dae54ba6a"
    },
    {
      "id": "chg_019fa9af-4dbc-7bc8-9805-4615a92bf42d",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "pubchem_search_compounds",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "pubchem_search_compounds"
      },
      "occurred_on": "2026-07-28",
      "occurred_at": "2026-07-28 17:04:26.031623+00",
      "observed_since": "2026-07-28",
      "source": "scan",
      "summary": "Tool “pubchem_search_compounds” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_019fa9af-4dbc-7bc8-9805-4615a92bf42d"
    },
    {
      "id": "chg_019fa916-55b9-79c6-93e6-edc2b0e7aa16",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "pubchem_get_compound_3d_structure",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "pubchem_get_compound_3d_structure"
      },
      "occurred_on": "2026-07-28",
      "occurred_at": "2026-07-28 14:17:21.07111+00",
      "observed_since": "2026-07-28",
      "source": "scan",
      "summary": "Tool “pubchem_get_compound_3d_structure” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_019fa916-55b9-79c6-93e6-edc2b0e7aa16"
    },
    {
      "id": "chg_019fa916-55ba-761e-855c-8fa36e62da9a",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "pubchem_get_compound_details",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "pubchem_get_compound_details"
      },
      "occurred_on": "2026-07-28",
      "occurred_at": "2026-07-28 14:17:21.07111+00",
      "observed_since": "2026-07-28",
      "source": "scan",
      "summary": "Tool “pubchem_get_compound_details” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/cyanheads-pubchem-mcp-server/pubchem#chg-chg_019fa916-55ba-761e-855c-8fa36e62da9a"
    }
  ],
  "days": [
    {
      "date": "2026-09-19",
      "total": 80,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-13",
      "total": 80,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-09",
      "total": 80,
      "delta": 1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-07",
      "total": 79,
      "delta": -1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-08-27",
      "total": 80,
      "delta": 3,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-08-26",
      "total": 77,
      "delta": 1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-08-24",
      "total": 76,
      "delta": 1,
      "tracked": true,
      "explained": false,
      "beyond_event_horizon": false,
      "attribution": {
        "category": "Stability & Change Management",
        "from": 73,
        "to": 77,
        "delta": 4,
        "others": [],
        "accrual": null,
        "partial": false,
        "compared_to": "2026-08-23",
        "summary": "No change was recorded against any check on this day. Stability & Change Management went from 73 to 77."
      },
      "event_count": 0
    },
    {
      "date": "2026-08-22",
      "total": 75,
      "delta": null,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 3
    }
  ]
}