Registry Lag — how fast MCP directories reflect a new server

Official2 tools

by registry-lag

Checks whether an MCP server is listed in MCP directories right now, and how long the listing took.

The Model Context Protocol (MCP) server app.rowb.registry-lag/reflection provides functionality to check whether an MCP server is currently listed in MCP directories. It also measures the time taken for that listing, returning both listing status and listing latency.

🛠️ Key Features

Checks whether an MCP server is listed in MCP directories “right now”
Reports listing time (how long the listing took)

🚀 Use Cases

Verify current directory presence of an MCP server
Assess directory listing lag for an MCP server

⚡ Developer Benefits

Visibility into directory listing status
Timing data for listing latency

⚠️ Limitations

Scope described only for directory listing checks and listing latency; no additional behaviors are specified

Captured live from the server via tools/list.

check_directory_lag

Check whether an MCP server name is listed in public MCP directories right now, and how long until it appeared (reflection lag).

Parameters1

name

string

required

server name fragment, 3-64 chars

Raw schema

{
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "description": "server name fragment, 3-64 chars"
    }
  },
  "required": [
    "name"
  ]
}

get_report

Names checked so far with run counts and first/last seen timestamps.

Parameters

No parameters.

Raw schema

{
  "type": "object",
  "properties": {}
}

Install

Tools (2)

check_directory_lagget_report

Remote endpoint

Streamable HTTP

Hosted server - connect over the network, no local install.

url

https://registry-lag.rowb.app/mcp

Add to VS Code Add to Cursor

claude_desktop_config.json

json

{
  "mcpServers": {
    "reflection": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://registry-lag.rowb.app/mcp"
      ]
    }
  }
}

Desktop config is stdio-only; this bridges via mcp-remote. Native remote: Settings > Connectors.