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alexar76/warden

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WARDEN — MCP security firewall: vets an MCP server's tool definitions against static-scan rules, a signed threat feed, origin and tool-def pinning before any tool reaches the model

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alexar76/warden

Added 16 Sept 2026

#firewall#mcp#mcp-security#model-context-protocol#prompt-injection#security#tool-poisoning#typescript
Catalogue record, not a reviewed recommendation. This record can include automatically collected descriptions and setup details. Confirm important claims with the original source. Explore source-reviewed tools.

Overview

WARDEN is a security firewall for MCP servers. It vets a server's tool definitions against static-scan rules, a signed threat feed, and origin and tool-definition pinning before any tool reaches the model. It is a zero-dependency TypeScript library.

Best for

Best for
Developers building MCP servers who need a lightweight pre-model security check

Use cases

  • Block malicious or risky MCP tools before model access
  • Enforce allowed tool origins and pinned definitions
  • Add a static security scan step to MCP server deployment

How to use

Install

npx -y @aimarket/warden            # bin: warden-mcp

Tools exposed

  • vet_mcp_server
  • static_scan_tools
  • classify_sensitive_tools
  • check_egress_url
  • canonicalize_json
  • list_scan_rules

Clients listed in this record (not verified here)

Claude Desktop, Cursor

Notes

0 stars on GitHub. Last updated 2026-09-05. Licensed MIT.

Pros

  • Zero-dependency TypeScript library
  • Layers static scans, signed feeds, and pinning
  • Runs before any tool reaches the model

Cons

  • Zero stars indicate no community validation yet
  • Only vets tool definitions, not runtime tool behavior
  • Requires keeping rules and threat feed current

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