OPEN SOURCE · MCP SERVER

Stop AI from inventing packages.

Verify packages. Build with confidence.

An MCP server that verifies package existence across npm, PyPI, Maven Central, Go, Cargo, and NuGet — preventing AI coding agents from installing hallucinated dependencies.

Add to your workflow View on GitHub

01 Agent suggests a dependency02 Registry check, before install Build on what exists

01 / CONNECT

Add package verification to your AI workflow.

One MCP endpoint. A little more certainty in every build.

REMOTE MCP SERVER

Connect using this server URL

REMOTE · HTTPS

https://package-reality-check.checkpackage.workers.dev/mcp

mcp.json

{
  "mcpServers": {
    "package-reality-check": {
      "url": "https://package-reality-check.checkpackage.workers.dev/mcp"
    }
  }
}

Works with MCP-compatible AI coding agents

02 / WHY IT MATTERS

A quick check. A better starting point.

Registry Verification

Check whether packages exist in supported package registries.

Catch Hallucinated Dependencies

Identify nonexistent packages before they enter your project.

MCP-Native

Connect package verification directly to compatible AI coding agents.