mcp

Implement MCP servers with Zod validation, allowlisted commands, and restricted resource access.

3|1|Updated Dec 3, 2025
One-click install
npx skills add https://github.com/Probably-Group/Dev-AID --skill mcp-probably-group
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: mcp
Source: https://github.com/Probably-Group/Dev-AID/tree/main/.dev-aid/skills/expert/mcp
Command: npx skills add https://github.com/Probably-Group/Dev-AID --skill mcp-probably-group

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires @modelcontextprotocol/sdk, zod, and includes references (resource) components.

What problem does it solve?

It helps you implement Model Context Protocol (MCP) servers safely by providing clear, repeatable rules that reduce security mistakes while enabling tools, resources, and prompt templates.

Core Features & Use Cases

  • Secure tool execution: Prevents command injection by enforcing allowlists and validates tool inputs with strict schemas.
  • Controlled resource access: Avoids path traversal and restricts resource URIs to the intended scope and permissions.
  • Prompt and output hardening: Defends against prompt injection and prevents secrets from leaking through tool responses or errors.
  • Use case: Create an MCP server that reads approved workspace files, exposes a search tool, and provides structured prompt templates for code review and explanation.

Quick Start

Use the mcp skill to generate an MCP server implementation that validates every tool argument, restricts file paths to the workspace, and returns MCP-safe error codes without leaking sensitive details.

Frequently Asked Questions about mcp

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I build a secure Model Context Protocol server for Claude?

Build a secure Model Context Protocol server by enforcing Zod-based input validation, allowlisted command execution, and resource URI restrictions to prevent command injection and path traversal. This approach ensures untrusted inputs are handled safely.

How do I prevent prompt injection and secrets redaction in MCP tool responses?

Prevent prompt injection and secrets redaction in MCP tool responses by applying prompt and output hardening techniques. These defenses ensure sensitive details do not leak through tool responses or error messages.

How do I restrict file workspace access in a Model Context Protocol server?

Restrict file workspace access in a Model Context Protocol server by enforcing resource URI and path restrictions. This controlled resource access avoids path traversal and limits scope to approved workspace files.

Can I use Zod schemas to validate MCP server tool arguments?

Yes, you can use Zod schemas to validate MCP server tool arguments. Zod-based input validation provides strict schema enforcement that prevents command injection and ensures untrusted inputs are handled safely.

What are the best ways to add rate limiting and timeouts to MCP server tools?

Add rate limiting and timeouts to MCP server tools by implementing guardrails within the server execution logic. These constraints prevent resource exhaustion and ensure tool execution remains within safe operational boundaries.

Does the Model Context Protocol SDK support custom prompt template provisioning?

Yes, the Model Context Protocol SDK supports custom prompt template provisioning. You can expose structured prompt templates for tasks like code review and explanation while maintaining safe prompt handling.