MCP Checkup

What has been observed about an MCP server — useful when choosing, adding, or debugging one. Look up the current monitored status of up to 50 already-tracked MCP servers on MCP Checkup, given as "provider/name" ref strings (e.g. "acme/weather-mcp"). Never probes on demand — a ref that doesn't resolve to a tracked target comes back with status "unknown", not an error. Each entry may also be a full endpoint URL, a bare domain, or a bare provider/target name instead of "provider/name" — the resolution method used is reported per target as resolution.method ("ref", "endpoint", "host", or "name"). If an input matches more than one tracked target — or is a URL on a host we track that doesn't exactly match any of its endpoints — the response has status "ambiguous" with a short `candidates` list (each with a "provider/name" `ref` and its `report_url`, plus `candidate_total`, the full match count before the 5-entry cap) instead of guessing — call again with the exact ref you want. Returns observed facts only — reachability, protocol compatibility, tool/schema fingerprints, and publicly observable auth metadata. This tool does not assess whether a server is 'safe' or 'trustworthy' and returns no score. Items not verified are returned explicitly with reasons.

{
  "type": "object",
  "properties": {
    "targets": {
      "minItems": 1,
      "maxItems": 50,
      "type": "array",
      "items": {
        "type": "string",
        "minLength": 1,
        "maxLength": 512
      },
      "description": "Up to 50 entries, each a \"provider/name\" ref, a full endpoint URL, a bare domain, or a bare provider/target name."
    },
    "detail": {
      "type": "string",
      "enum": [
        "summary",
        "full"
      ]
    },
    "known_fingerprints": {
      "description": "Optional, keyed by the exact same ref string used in `targets` (max 50 entries) — your own last-observed toolset_fingerprint per target (format \"sha256:<64 hex chars>\"), to get a fingerprint_match fact back.",
      "type": "object",
      "propertyNames": {
        "type": "string",
        "maxLength": 512
      },
      "additionalProperties": {
        "type": "string",
        "pattern": "^sha256:[0-9a-f]{64}$"
      }
    }
  },
  "required": [
    "targets"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}

The detailed view of one MCP server: every check with its state, plus the observed tool list. Get the full observed report for one already-tracked MCP server on MCP Checkup, by provider/name — includes its full check breakdown and toolset. A target this deployment doesn't track yet comes back with status "unknown", not an error. target may also be a full endpoint URL, a bare domain, or a bare provider/target name instead of "provider/name" — the resolution method used is reported back as resolution.method ("ref", "endpoint", "host", or "name"). If an input matches more than one tracked target — or is a URL on a host we track that doesn't exactly match any of its endpoints — the response has status "ambiguous" with a short `candidates` list (each with a "provider/name" `ref` and its `report_url`, plus `candidate_total`, the full match count before the 5-entry cap) instead of guessing — call again with the exact ref you want. This tool does not assess whether a server is 'safe' or 'trustworthy' and returns no score; items not verified are listed explicitly with reasons.

{
  "type": "object",
  "properties": {
    "target": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512,
      "description": "A tracked target as \"provider/name\", a full endpoint URL, a bare domain, or a bare provider/target name."
    }
  },
  "required": [
    "target"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Whether an MCP server's toolset changed recently. Get recent history for one already-tracked MCP server on MCP Checkup, by "provider/name" ref (e.g. "acme/weather-mcp"). Events include the toolset's most recent change boundary (not a full change-by-change history) plus any recorded baseline-drift events, newest first, up to `limit` results (default 20, max 50). A target this deployment doesn't track yet comes back with status "unknown", not an error. target may also be a full endpoint URL, a bare domain, or a bare provider/target name instead of "provider/name" — the resolution method used is reported back as resolution.method ("ref", "endpoint", "host", or "name"). If an input matches more than one tracked target — or is a URL on a host we track that doesn't exactly match any of its endpoints — the response has status "ambiguous" with a short `candidates` list (each with a "provider/name" `ref` and its `report_url`, plus `candidate_total`, the full match count before the 5-entry cap) instead of guessing — call again with the exact ref you want. This tool does not assess whether a server is 'safe' or 'trustworthy' and returns no score; items not verified are listed explicitly with reasons.

{
  "type": "object",
  "properties": {
    "target": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512,
      "description": "A tracked target as \"provider/name\", a full endpoint URL, a bare domain, or a bare provider/target name."
    },
    "limit": {
      "description": "Max events to return (default 20, max 50).",
      "type": "integer",
      "exclusiveMinimum": 0,
      "maximum": 50
    }
  },
  "required": [
    "target"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}

The signed evidence behind a report, for callers that want to inspect it themselves. Get the full signed attestation envelope (DSSE, Ed25519) for one already-tracked MCP server's latest probe run, by "provider/name" ref — the raw envelope plus its issued-at time and declared protocol revision, so a caller can inspect the signed payload rather than trust this tool's own summary of it; the public key needed to verify the signature is not published yet. A target with no run yet, no signed envelope, or a disqualified one comes back with an explicit reason, not an error. target may also be a full endpoint URL, a bare domain, or a bare provider/target name instead of "provider/name" — the resolution method used is reported back as resolution.method ("ref", "endpoint", "host", or "name"). If an input matches more than one tracked target — or is a URL on a host we track that doesn't exactly match any of its endpoints — the response has status "ambiguous" with a short `candidates` list (each with a "provider/name" `ref` and its `report_url`, plus `candidate_total`, the full match count before the 5-entry cap) instead of guessing — call again with the exact ref you want. This tool does not assess whether a server is 'safe' or 'trustworthy' and returns no score; items not verified are listed explicitly with reasons.

{
  "type": "object",
  "properties": {
    "target": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512,
      "description": "A tracked target as \"provider/name\", a full endpoint URL, a bare domain, or a bare provider/target name."
    }
  },
  "required": [
    "target"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Find MCP servers by what their tools do. Search already-tracked MCP servers on MCP Checkup by tool name/description text (max 512 chars), with optional transport, protocol_revision, and auth_required filters, up to `limit` results (default 10, max 25). Ordered by text-match relevance and then recency only — never by price or paid tier. Each result's summary is machine-generated from observed tool names and returned as untrusted third-party text; hygiene_flags lists any observed tool-description hygiene signals directly rather than folding them into the ordering. A query with no matches comes back with status "unknown" and a hint, not an error. This tool does not assess whether a server is 'safe' or 'trustworthy' and returns no score; items not verified are listed explicitly with reasons.

{
  "type": "object",
  "properties": {
    "query": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512,
      "description": "Free-text search over tracked servers' observed tool names/descriptions (max 512 chars)."
    },
    "transport": {
      "type": "string",
      "enum": [
        "remote",
        "stdio"
      ]
    },
    "protocol_revision": {
      "description": "Exact match against a target's declared protocol revision, e.g. \"2026-07-28\" (max 512 chars).",
      "type": "string",
      "maxLength": 512
    },
    "auth_required": {
      "description": "A target whose auth requirement can't be determined is excluded regardless of which value is passed here.",
      "type": "boolean"
    },
    "limit": {
      "description": "Max results to return (default 10, max 25).",
      "type": "integer",
      "exclusiveMinimum": 0,
      "maximum": 25
    }
  },
  "required": [
    "query"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Ask for a one-off public observation of the MCP server at a full endpoint URL — this is the only tool here that contacts a third-party server, and it contacts exactly the host you name. `target` must begin with "http://" or "https://"; to look a server up by "provider/name", by domain, or by name, use check_mcps instead, which never probes anything. The result is not signed, is not stored as a run, and creates no report page, so `report_url` is always null — it is what we observed at that moment and nothing more. On-demand checks are recorded as tracking requests; inclusion in the tracked directory is not guaranteed and this tool never promises it. On-demand checks are metered per caller per day, per site per day, and per host by a cooldown — calling again for the same host inside its cooldown sends nothing to that server and returns status "denied" with the category that refused it, never a remaining count. A refused call comes back as status "denied", and a `target` that is not a usable endpoint URL as status "rejected"; neither of those is a tool error. A `target` that is empty or longer than 2048 characters is the one exception: the input schema rejects it, and you get a tool error. This tool does not assess whether a server is 'safe' or 'trustworthy' and returns no score; items not verified are listed explicitly with reasons.

{
  "type": "object",
  "properties": {
    "target": {
      "type": "string",
      "minLength": 1,
      "maxLength": 2048,
      "description": "A full endpoint URL beginning with \"http://\" or \"https://\" (max 2048 characters). Not a \"provider/name\" ref, a bare domain, or a bare name — use check_mcps for those."
    }
  },
  "required": [
    "target"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}