How does it prevent 'Rug Pull' attacks?

The skill implements hash verification, which compares the tool's current description against a known-good hash to detect unexpected changes before execution.

Does it include rate limiting for tools?

Yes, it provides logic for both per-tool and per-session rate limiting to prevent resource exhaustion and automated abuse of AI-exposed tools.

Is this skill compatible with any MCP server?

Yes, the patterns provided are architectural best practices that can be integrated into any MCP-compliant server regardless of the underlying programming language.

What is the main goal of MCP Security Hardening?

It provides patterns to prevent attacks like prompt injection and tool poisoning by treating all tool descriptions as untrusted input and validating them against an allowlist.

What are capability declarations?

Capability declarations are granular permissions (like read:file or network:request) that explicitly define what resources a specific tool is authorized to access.

MCP Security Hardening

Name: MCP Security Hardening
Author: yonatangross

byyonatangross

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Security & Testing

Implements defense-in-depth security patterns to protect Model Context Protocol (MCP) integrations against prompt injection and tool poisoning.

MCP Security Hardening provides a comprehensive framework for securing Model Context Protocol (MCP) servers and integrations. It establishes a zero-trust architecture by enforcing tool description sanitization, mandatory hash verification, and granular capability declarations. This skill is essential for developers building production-ready AI agents that need to mitigate risks like 'Rug Pull' attacks, data exfiltration, and unauthorized command execution through LLM-exposed tools, ensuring that every tool interaction follows the principle of least privilege.

Key Features

01Secure session management with high-entropy cryptographic IDs

02Granular capability enforcement for file and network access

03Multi-layer prompt injection defense and description sanitization

0469 GitHub stars

05Zero-trust tool allowlisting with cryptographic hash verification

06Rate limiting patterns for both tools and user sessions

Use Cases

01Hardening production MCP servers against adversarial prompt attacks

02Preventing tool poisoning (TPA) in complex multi-agent system environments

03Implementing human-in-the-loop approvals for sensitive file or database operations

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add yonatangross/orchestkit mcp-security-hardening

For use in Claude.ai and ChatGPT

Download Skill