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MCP Server Security Skill by @BagelHole

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github stars★ 1,180updatedMar 2026repo@BagelHole

$git clone https://github.com/BagelHole/DevOps-Security-Agent-Skills

The skill is the security/ai/mcp-server-security folder inside that repository. Copy it into the folder your agent loads skills from; check your agent's documentation for where that is.

about MCP Server Security Skill by @BagelHole

Secure Model Context Protocol (MCP) servers with transport encryption, tool authorization, input validation, and audit logging for safe AI agent integrations.

our take

Hardens MCP servers with transport encryption, tool authorisation, input validation and audit logging. It starts with an MCP threat model and covers TLS for HTTP transports and mutual TLS between agent and server.

when to use it

You run an MCP server that reaches real systems
You need a threat model for agent-to-tool traffic
You are adding authorisation and logging to tools

before you install

Security guidance needs adapting to your environment and verifying by a specialist for critical systems
Least privilege on the server's own credentials matters as much as the transport

what's inside

The original SKILL.md is organised into these sections:

1. When to Use This Skill
2. MCP Threat Model
3. Transport Security
3.1 TLS for Streamable HTTP and SSE Transports
3.2 mTLS Between Agent and Server
3.3 Securing stdio Transport
4. Authentication and Authorization
4.1 OAuth 2.1 Integration
4.2 API Key Management
5. Tool Authorization
5.1 Allowlist Patterns
5.2 Per-User Tool Access Enforcement

source and license

Written and maintained by @BagelHole. It is published under the MIT license, which allows reuse with attribution. SkillDirectory does not claim authorship: this page adds our own review and links back to the original, and the skill's text belongs to its author.

View the full SKILL.md on GitHub ↗

Read the opening of the original SKILL.md

# MCP Server Security

Comprehensive hardening guide for Model Context Protocol (MCP) servers. MCP is the open
standard for connecting AI agents to external tools, data sources, and services. Because
MCP servers execute real actions on real infrastructure, they are a high-value attack
surface. This skill covers every layer of defense you need before exposing an MCP server
to agents in production.

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## 1. When to Use This Skill

Apply this skill whenever you are:

- Deploying an MCP server that exposes tools (filesystem, database, API) to AI agents.
- Connecting an agent runtime (Claude Desktop, Cursor, a custom orchestrator) to one or
  more MCP servers over stdio, SSE, or Streamable HTTP transport.
- Building a multi-tenant platform where multiple users share the same MCP server.
- Passing sensitive data (PII, credentials, internal documents) through MCP resources.
- Operating in a regulated environment (SOC 2, HIPAA, PCI-DSS) where tool invocations
  must be auditable.
…

Excerpt only, quoted from the author's repository. Open the repository for the complete file.

↓ download .zip