Developer toolsPublic source

Package Registry MCP Server

Let your AI agents check dependencies. This MCP server queries crates.io and npm to look up packages, check versions, find advisories, analyze lockfiles, and propose upgrade plans.

Open the source Read the official guide ↗

What it gives an agent

A purpose-built capability behind one MCP connection.

The server owns its domain logic and publishes a tool contract an MCP client can discover. ADK-Rust can load that contract into an agent, normalize each schema for the chosen model provider, and keep the connection lifecycle outside the agent’s business logic.

Provides package capabilities through a typed MCP contract.

Provides registry capabilities through a typed MCP contract.

Architecture

How Package Registry MCP Server fits into an agent system.

The model never needs the implementation details or credentials of the system behind the server. It sees reviewed tool definitions. The MCP client handles discovery and calls, while the server keeps ownership of validation, policy, and communication with its domain system.

ADK-Rust agent

Chooses a capability from the reviewed tool catalog.

→

MCP client

Discovers schemas, sends calls, and receives typed content.

→

Package Registry MCP Server

Validates the request and owns 7 documented tool contracts.

→

Domain system

Keeps the API, data, credentials, and business rules behind the server.

Connection: stdio · Server framework: ADK MCP SDK + rmcp

Package Registry MCP Server architecture diagram from its official repository

Tool catalog

What can an agent ask Package Registry MCP Server to do?

Each tool has a stable name, a human-readable purpose, and a JSON input contract discovered during MCP initialization. Risk classes come from the project’s registry manifest when one is available.

7 named tools

lookup_package

Look up a package — description, latest version, downloads, repository

read only

list_versions

List available versions of a package (most recent first)

read only

get_changelog

Get changelog or release notes for a package version

read only

check_advisories

Check for known security advisories for a package

read only

check_compatibility

Check if upgrading between two versions is compatible (semver analysis)

read only

analyze_lockfile

Analyze a lockfile — count packages, detect outdated

read only

propose_upgrades

Propose an upgrade plan for outdated dependencies

read only

Governance

Understand the effect of every tool.

A server connection inherits the authority of its credentials and deployment environment. The declarations below come from this project’s README and MCP registry manifest; your application still decides which tools an agent receives and where approval is required.

7 read only

The registry manifest declares read only tool risk classes.

MCP surface

What the current documentation declares.

MCP can carry tools, resources, prompts, structured results, progress, cancellation, and long-running work. This record highlights the modern protocol features explicitly mentioned by this repository.

The current README concentrates on its tool surface. Check the source and release notes before relying on optional MCP capabilities beyond tool discovery and invocation.

ADK MCP SDKrmcpRegistry manifest

Install and connect

Follow the project’s documented starting point.

Install the server in the environment that owns its credentials and domain access. Add it to your MCP host, verify the discovered tools, and narrow the toolset before giving it to a production agent.

Install

cargo install mcp-package-registry

ADK-Rust connection shape

let toolset = McpToolset::from_stdio(
    "mcp-package-registry",
    ["mcp-package-registry"],
).await?;

let agent = LlmAgentBuilder::new("agent")
    .tools(toolset.tools().await?)
    .build()?;

Commands and configuration are extracted from the public README. Confirm prerequisites, environment variables, and release-specific options in the official documentation before deployment.

Official documentation

Continue with the project maintainers’ source of truth.

This page provides an approachable map of the server. The repository remains authoritative for exact schemas, prerequisites, configuration, examples, tests, releases, and security updates.

Overview ↗README.md CHANGELOG ↗CHANGELOG.md Architecture ↗docs/architecture.svg Issues and support ↗github.com issues

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