{
  "$schema": "https://verifymcp.io/schemas/changelog.json",
  "server": "402signalhq-402signal",
  "component": "mcp-v0-3-1",
  "generated_at": "2026-09-21T00:55:20.893Z",
  "tracking_since": "2026-09-04",
  "counts": {
    "critical": 0,
    "security": 22,
    "functional": 0,
    "cosmetic": 0
  },
  "events": [
    {
      "id": "chg_01a09e1a-64ef-7085-9eef-e0123e1e2153",
      "kind": "check.verdict",
      "family": "stability",
      "subject_kind": "check",
      "subject": "stability",
      "subject_child": "",
      "from_code": "stability.building_history",
      "to_code": "stability.churn",
      "from_value": "0.23",
      "to_value": "fail",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {
        "days": "8",
        "added": "1",
        "breaks": "0",
        "removed": "1",
        "auth_transport": "0"
      },
      "occurred_on": "2026-09-14",
      "occurred_at": "2026-09-14 04:08:44.930358+00",
      "observed_since": "2026-09-13",
      "source": "scan",
      "summary": "Stability (0.23 → fail)",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64ef-7085-9eef-e0123e1e2153"
    },
    {
      "id": "chg_01a09e1a-64ef-7e18-b434-aecfff896de7",
      "kind": "check.reverified",
      "family": "auth-oauth",
      "subject_kind": "check",
      "subject": "auth-oauth",
      "subject_child": "",
      "from_code": "auth.none_undeclared",
      "to_code": "auth.none_no_destructive",
      "from_value": "unverified",
      "to_value": "partial",
      "materiality": "security",
      "direction": "improvement",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-09-14",
      "occurred_at": "2026-09-14 04:08:44.930358+00",
      "observed_since": "2026-09-13",
      "source": "scan",
      "summary": "Authorization (unverified → partial)",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64ef-7e18-b434-aecfff896de7"
    },
    {
      "id": "chg_01a09e1a-64f0-79b9-a416-0db6f739f893",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "preview",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "preview"
      },
      "occurred_on": "2026-09-14",
      "occurred_at": "2026-09-14 04:08:44.930358+00",
      "observed_since": "2026-09-13",
      "source": "scan",
      "summary": "Tool “preview” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64f0-79b9-a416-0db6f739f893"
    },
    {
      "id": "chg_01a09e1a-64f1-7573-85e4-d50352d4f97f",
      "kind": "tool.removed",
      "family": "",
      "subject_kind": "tool",
      "subject": "route",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {
        "tool": "route"
      },
      "occurred_on": "2026-09-14",
      "occurred_at": "2026-09-14 04:08:44.930358+00",
      "observed_since": "2026-09-13",
      "source": "scan",
      "summary": "Tool “route” was removed",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64f1-7573-85e4-d50352d4f97f"
    },
    {
      "id": "chg_01a09e1a-64f1-7b48-9ff4-bbdabb6a254e",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "validate",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "validate"
      },
      "occurred_on": "2026-09-14",
      "occurred_at": "2026-09-14 04:08:44.930358+00",
      "observed_since": "2026-09-13",
      "source": "scan",
      "summary": "Tool “validate” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64f1-7b48-9ff4-bbdabb6a254e"
    },
    {
      "id": "chg_01a09e1a-64f2-75e9-b581-ed36ec232e1f",
      "kind": "server.breaking_without_version_bump",
      "family": "",
      "subject_kind": "server",
      "subject": "0.5.0",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": "0.5.0",
      "to_value": "0.5.0",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {
        "removed": "1",
        "version": "0.5.0",
        "breaking": "0"
      },
      "occurred_on": "2026-09-14",
      "occurred_at": "2026-09-14 04:08:44.930358+00",
      "observed_since": "2026-09-13",
      "source": "scan",
      "summary": "A breaking change shipped without a version bump (still 0.5.0)",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64f2-75e9-b581-ed36ec232e1f"
    },
    {
      "id": "chg_01a098f3-5c38-7dca-9b68-2ecf338db4b6",
      "kind": "check.reverified",
      "family": "tool-safety-injection",
      "subject_kind": "check",
      "subject": "tool-safety-injection",
      "subject_child": "",
      "from_code": "toolsafety.unreachable",
      "to_code": "toolsafety.injection_clean",
      "from_value": "unverified",
      "to_value": "pass",
      "materiality": "security",
      "direction": "improvement",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-09-13",
      "occurred_at": "2026-09-13 04:08:00.655089+00",
      "observed_since": "2026-09-12",
      "source": "scan",
      "summary": "Injection markers (unverified → pass)",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c38-7dca-9b68-2ecf338db4b6"
    },
    {
      "id": "chg_01a098f3-5c3a-758b-8c0d-374fa146f74a",
      "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": "3"
      },
      "occurred_on": "2026-09-13",
      "occurred_at": "2026-09-13 04:08:00.655089+00",
      "observed_since": "2026-09-12",
      "source": "scan",
      "summary": "Authorization (Authorisation not fully verified: no authorisation is required to call this server, and 3 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/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c3a-758b-8c0d-374fa146f74a"
    },
    {
      "id": "chg_01a098f3-5c3f-780d-9f67-141d448e69f4",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "preview",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "preview"
      },
      "occurred_on": "2026-09-13",
      "occurred_at": "2026-09-13 04:08:00.655089+00",
      "observed_since": "2026-09-09",
      "source": "scan",
      "summary": "Tool “preview” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c3f-780d-9f67-141d448e69f4"
    },
    {
      "id": "chg_01a098f3-5c40-7963-b48b-a860deb346ce",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "route",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "route"
      },
      "occurred_on": "2026-09-13",
      "occurred_at": "2026-09-13 04:08:00.655089+00",
      "observed_since": "2026-09-09",
      "source": "scan",
      "summary": "Tool “route” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c40-7963-b48b-a860deb346ce"
    },
    {
      "id": "chg_01a098f3-5c42-705a-91e2-ea969ab0ca88",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "validate",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "validate"
      },
      "occurred_on": "2026-09-13",
      "occurred_at": "2026-09-13 04:08:00.655089+00",
      "observed_since": "2026-09-09",
      "source": "scan",
      "summary": "Tool “validate” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c42-705a-91e2-ea969ab0ca88"
    },
    {
      "id": "chg_01a0882f-7213-7b19-af38-a16ad8e0b5a1",
      "kind": "check.unverifiable",
      "family": "stability",
      "subject_kind": "check",
      "subject": "stability",
      "subject_child": "",
      "from_code": "stability.building_history",
      "to_code": "stability.insufficient_history",
      "from_value": "0.07",
      "to_value": "unverified",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-09-09",
      "occurred_at": "2026-09-09 22:00:05.871324+00",
      "observed_since": "2026-09-08",
      "source": "scan",
      "summary": "Stability (0.07 → unverified)",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a0882f-7213-7b19-af38-a16ad8e0b5a1"
    },
    {
      "id": "chg_01a0882f-7215-750c-af8a-378284209f81",
      "kind": "check.unverifiable",
      "family": "tool-safety-injection",
      "subject_kind": "check",
      "subject": "tool-safety-injection",
      "subject_child": "",
      "from_code": "toolsafety.injection_clean",
      "to_code": "toolsafety.unreachable",
      "from_value": "pass",
      "to_value": "unverified",
      "materiality": "security",
      "direction": "regression",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-09-09",
      "occurred_at": "2026-09-09 22:00:05.871324+00",
      "observed_since": "2026-09-08",
      "source": "scan",
      "summary": "Tool safety (pass → unverified)",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a0882f-7215-750c-af8a-378284209f81"
    },
    {
      "id": "chg_01a0882f-7215-7c1b-b495-52298cb1a879",
      "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": "2026-09-09",
      "occurred_at": "2026-09-09 22:00:05.871324+00",
      "observed_since": "2026-09-08",
      "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/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a0882f-7215-7c1b-b495-52298cb1a879"
    },
    {
      "id": "chg_01a0882f-7217-7a5f-a1ae-fe86c91d202a",
      "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": "2026-09-09",
      "occurred_at": "2026-09-09 22:00:05.871324+00",
      "observed_since": "2026-09-08",
      "source": "scan",
      "summary": "Endpoint reachability (reachable → not serving MCP)",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a0882f-7217-7a5f-a1ae-fe86c91d202a"
    },
    {
      "id": "chg_01a07f37-6b6a-7320-a5a7-b50834064a52",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "preview",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "preview"
      },
      "occurred_on": "2026-09-08",
      "occurred_at": "2026-09-08 04:12:13.449235+00",
      "observed_since": "2026-09-07",
      "source": "scan",
      "summary": "Tool “preview” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a07f37-6b6a-7320-a5a7-b50834064a52"
    },
    {
      "id": "chg_01a07f37-6b6a-7e01-ae2a-00e48d9365f7",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "route",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "route"
      },
      "occurred_on": "2026-09-08",
      "occurred_at": "2026-09-08 04:12:13.449235+00",
      "observed_since": "2026-09-07",
      "source": "scan",
      "summary": "Tool “route” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a07f37-6b6a-7e01-ae2a-00e48d9365f7"
    },
    {
      "id": "chg_01a07f37-6b6b-76aa-8f74-dfb7f3c0d22d",
      "kind": "tool.description_changed",
      "family": "",
      "subject_kind": "tool",
      "subject": "validate",
      "subject_child": "",
      "from_code": null,
      "to_code": null,
      "from_value": null,
      "to_value": null,
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "tool": "validate"
      },
      "occurred_on": "2026-09-08",
      "occurred_at": "2026-09-08 04:12:13.449235+00",
      "observed_since": "2026-09-07",
      "source": "scan",
      "summary": "Tool “validate” rewrote its description, which is the text the model reads",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a07f37-6b6b-76aa-8f74-dfb7f3c0d22d"
    },
    {
      "id": "chg_01a074e8-6fd7-7e44-b13c-ede8e0b35b8d",
      "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": "2026-09-06",
      "occurred_at": "2026-09-06 04:09:45.046587+00",
      "observed_since": "2026-09-05",
      "source": "scan",
      "summary": "Transport (fail → pass)",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a074e8-6fd7-7e44-b13c-ede8e0b35b8d"
    },
    {
      "id": "chg_01a074e8-6fd8-764d-b936-eb5c9dfdef37",
      "kind": "check.reverified",
      "family": "tool-safety-injection",
      "subject_kind": "check",
      "subject": "tool-safety-injection",
      "subject_child": "",
      "from_code": "toolsafety.unreachable",
      "to_code": "toolsafety.injection_clean",
      "from_value": "unverified",
      "to_value": "pass",
      "materiality": "security",
      "direction": "improvement",
      "score_delta": null,
      "detail": {},
      "occurred_on": "2026-09-06",
      "occurred_at": "2026-09-06 04:09:45.046587+00",
      "observed_since": "2026-09-05",
      "source": "scan",
      "summary": "Injection markers (unverified → pass)",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a074e8-6fd8-764d-b936-eb5c9dfdef37"
    },
    {
      "id": "chg_01a074e8-6fd8-7a87-9219-144723bf7a77",
      "kind": "check.appeared",
      "family": "tool-safety-manipulation",
      "subject_kind": "check",
      "subject": "tool-safety-manipulation",
      "subject_child": "",
      "from_code": null,
      "to_code": "toolsafety.manipulation_clean",
      "from_value": null,
      "to_value": "pass",
      "materiality": "security",
      "direction": "neutral",
      "score_delta": null,
      "detail": {
        "units": "3",
        "judged": "3"
      },
      "occurred_on": "2026-09-06",
      "occurred_at": "2026-09-06 04:09:45.046587+00",
      "observed_since": "2026-09-05",
      "source": "scan",
      "summary": "First check of Judged manipulation (pass)",
      "link": "https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a074e8-6fd8-7a87-9219-144723bf7a77"
    },
    {
      "id": "chg_01a074e8-6fd9-711f-a9cc-151151d03ce9",
      "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": "3"
      },
      "occurred_on": "2026-09-06",
      "occurred_at": "2026-09-06 04:09:45.046587+00",
      "observed_since": "2026-09-05",
      "source": "scan",
      "summary": "Authorization (Authorisation not fully verified: no authorisation is required to call this server, and 3 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/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a074e8-6fd9-711f-a9cc-151151d03ce9"
    }
  ],
  "days": [
    {
      "date": "2026-09-20",
      "total": 71,
      "delta": 1,
      "tracked": true,
      "explained": false,
      "beyond_event_horizon": false,
      "attribution": {
        "category": "Stability & Change Management",
        "from": 6,
        "to": 9,
        "delta": 3,
        "others": [],
        "accrual": null,
        "partial": false,
        "compared_to": "2026-09-19",
        "summary": "No change was recorded against any check on this day. Stability & Change Management went from 6 to 9."
      },
      "event_count": 0
    },
    {
      "date": "2026-09-15",
      "total": 70,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 2
    },
    {
      "date": "2026-09-14",
      "total": 70,
      "delta": 4,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 9
    },
    {
      "date": "2026-09-13",
      "total": 66,
      "delta": 31,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 12
    },
    {
      "date": "2026-09-09",
      "total": 35,
      "delta": -29,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 6
    },
    {
      "date": "2026-09-08",
      "total": 64,
      "delta": 1,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 7
    },
    {
      "date": "2026-09-07",
      "total": 63,
      "delta": 0,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 1
    },
    {
      "date": "2026-09-06",
      "total": 63,
      "delta": 38,
      "tracked": true,
      "explained": true,
      "beyond_event_horizon": false,
      "attribution": null,
      "event_count": 12
    }
  ]
}