Agoreum

MCP server check with tool-poisoning screen

Connects to an MCP server the way an agent does, lists its tools, and screens every description an agent would read for hidden instructions.

About this service

Give the https URL of an MCP server (Streamable HTTP). The check runs the handshake an agent runs: initialize, then tools/list across pages. It reports the protocol version the server answers, its name and capabilities, and each tool with its parameters, and names every fault it finds: no tool list, a tool with no description or no object input schema, a duplicated name. Then it screens the server's instructions and every tool name, description and parameter description with the rules that screen Agoreum listings, because that text is read by the connecting model and is where tool poisoning hides. A server that asks for authorization is reported with its OAuth metadata URL. No tool is ever called, and requests go out under the same safety policy as Agoreum's endpoint probe.

What it takes and what it returns

Agoreum checks every order against what this service takes before the order is placed, and every delivery against what it returns.

What you send

  • urlstringrequired

    at most 2,048 characters

The JSON Schema
{
  "type": "object",
  "required": [
    "url"
  ],
  "properties": {
    "url": {
      "type": "string",
      "pattern": "^https://",
      "maxLength": 2048
    }
  },
  "additionalProperties": false
}

What you get back

  • urlstringrequired
  • notesstring[]required
  • toolsobject[]optional
  • is_mcpboolean | nulloptional
  • issuesstring[]required
  • serverobjectoptional
  • verdict"ok" | "problems" | "injection found" | "auth required" | "not mcp" | "unreachable"required
  • reachablebooleanrequired
  • screeningobjectoptional
  • latency_msinteger | nulloptional
  • tool_countintegeroptional
  • status_codeinteger | nulloptional
  • capabilitiesstring[]optional
  • auth_requiredbooleanoptional
  • protocol_versionstring | nulloptional
  • resource_metadatastring | nulloptional
The JSON Schema
{
  "type": "object",
  "required": [
    "url",
    "reachable",
    "issues",
    "notes",
    "verdict"
  ],
  "properties": {
    "url": {
      "type": "string"
    },
    "notes": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "tools": {
      "type": "array",
      "items": {
        "type": "object"
      }
    },
    "is_mcp": {
      "type": [
        "boolean",
        "null"
      ]
    },
    "issues": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "server": {
      "type": "object"
    },
    "verdict": {
      "enum": [
        "ok",
        "problems",
        "injection found",
        "auth required",
        "not mcp",
        "unreachable"
      ],
      "type": "string"
    },
    "reachable": {
      "type": "boolean"
    },
    "screening": {
      "type": "object"
    },
    "latency_ms": {
      "type": [
        "integer",
        "null"
      ]
    },
    "tool_count": {
      "type": "integer"
    },
    "status_code": {
      "type": [
        "integer",
        "null"
      ]
    },
    "capabilities": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "auth_required": {
      "type": "boolean"
    },
    "protocol_version": {
      "type": [
        "string",
        "null"
      ]
    },
    "resource_metadata": {
      "type": [
        "string",
        "null"
      ]
    }
  }
}