DepScope MCP Server

npm version License: AGPL-3.0 MCP Compatible

Package intelligence MCP server for AI agents. Stops AI coding agents (Claude, ChatGPT, Cursor, Windsurf, Copilot) from installing hallucinated, deprecated, or malicious packages across 19 ecosystems.

→ Backed by depscope.dev — 1.2M+ packages indexed, 19,000+ vulnerabilities tracked, real-time.

What's new in v0.9.0

The MCP server now sends a system-prompt directive to your AI client at handshake (server.instructions). Claude Code, Cursor, Windsurf and other MCP clients receive a proactive-invocation brief automatically — manual rule files (CLAUDE.md, .cursorrules, .windsurfrules) are now optional. Existing rules still work; they're just redundant.

What the model sees at every session start:

The 19-ecosystem coverage list
An "INVOKE PROACTIVELY" directive with explicit triggers (install, version bump, lockfile change, "module not found" errors, library comparison)
Three pillars: token-saving, energy-saving, security
Standard invocation flow: check_malicious → check_typosquat → check_package → install_command

For Claude Code there is also a companion plugin that bundles the MCP server with a skill carrying rich frontmatter triggers:

git clone https://github.com/cuttalo/depscope-claude-plugin ~/.claude/plugins/depscope

All npm versions <0.9.0 are now deprecated. Run npm update -g depscope-mcp if you installed globally.

Why this exists

LLMs frequently invent package names that look real but don't exist (fastapi-turbo, lodahs, tokio-stream-extras). When an agent tries to install one, it might hit an attacker's typosquat. DepScope verifies every package before install.

Quick start

Claude Desktop / Cursor / Windsurf (remote MCP)

Add to your MCP config:

{
  "mcpServers": {
    "depscope": {
      "url": "https://mcp.depscope.dev/mcp"
    }
  }
}

Local (stdio via npx)

{
  "mcpServers": {
    "depscope": {
      "command": "npx",
      "args": ["-y", "depscope-mcp"]
    }
  }
}

Tools (22)

Tool	Purpose
`check_package`	Full package check: deprecated/CVE/health/recommendation
`get_health_score`	0-100 score with breakdown (maintenance/popularity/security/maturity/community)
`get_vulnerabilities`	Open CVEs from OSV + KEV/EPSS
`package_exists`	Hallucination detector (404 = LLM invented it)
`find_alternatives`	Curated alternatives for deprecated/abandoned packages
`get_typosquat`	Suspicious name similarity check
`get_breaking_changes`	Migration plan between versions
`get_bugs`	Known bugs from GitHub issues
`compare_packages`	Side-by-side health/license/vuln comparison
`resolve_error`	Map error message → likely cause + fix
`search_errors`	Find similar error reports across ecosystems
`check_compat`	Stack compatibility check
`get_latest_version`	Latest stable + maturity signal
... and 9 more	full list in `tools.js`

Ecosystems (19)

npm · pypi · cargo · go · composer · maven · nuget · rubygems · pub · hex · swift · cocoapods · cpan · hackage · cran · conda · homebrew · jsr · julia

Pricing

Free. No auth required. Generous rate limits. The MCP server is open-source (AGPL-3.0); the backend (depscope.dev API) is proprietary.

License

AGPL-3.0-or-later. Backend is proprietary; this client is open.

depscope-mcp