Mcp Builder
Official anthropics skill for MCP tools — helps with orchestrating AI agents and multi-step workflows.
Install on your platform
We auto-selected Claude Code based on this skill’s supported platforms.
Run in terminal (recommended)
claude mcp add mcp-builder npx -- -y @trustedskills/mcp-builder
Or manually add to ~/.claude/settings.json
{
"mcpServers": {
"mcp-builder": {
"command": "npx",
"args": [
"-y",
"@trustedskills/mcp-builder"
]
}
}
}Requires Claude Code (claude CLI). Run claude --version to verify your install.
About This Skill
What it does
The Mcp Builder skill provides a comprehensive guide for developing high-quality MCP (Model Context Protocol) servers. These servers enable Large Language Models (LLMs) to interact with external services through well-defined tools, ultimately allowing agents to accomplish real-world tasks. The skill focuses on best practices across four phases: research, implementation, testing, and evaluation, with specific guidance for TypeScript and Python development. It emphasizes API coverage and clear tool naming over complex workflow tools.
When to use it
- When building an MCP server to connect LLMs to external services.
- If you want to ensure your MCP server enables effective agent performance on real-world tasks.
- For developers using TypeScript or Python to implement MCP servers and seeking best practices.
- When needing a structured evaluation framework for validating the effectiveness of your MCP server with an LLM.
Key capabilities
- Four-phase workflow (research, implementation, testing, evaluation) for building MCP servers.
- Guidance on balancing API coverage versus specialized workflow tools.
- Best practices for clear and consistent tool naming conventions using prefixes.
- Recommendations for input/output schemas, pagination, response formatting, and tool annotations (readOnly, destructive, idempotent, openWorld hints).
- An evaluation framework requiring 10 complex questions with verifiable XML answers to validate LLM effectiveness.
Example prompts
- "Guide me through the research phase of building an MCP server."
- "What are best practices for naming tools in my MCP server?"
- "Show me code examples for implementing pagination in a TypeScript MCP tool."
Tips & gotchas
- Prioritize comprehensive API coverage over workflow tools when unsure, as performance varies by client.
- The evaluation framework requires creating 10 independent, read-only questions with verifiable answers in XML format to properly assess your server's effectiveness.
- Consistent tool naming and clear descriptions are crucial for agent discoverability and efficient operation.
Tags
TrustedSkills Verification
Unlike other registries that point to live repositories, TrustedSkills pins every skill to a verified commit hash. This protects you from malicious updates — what you install today is exactly what was reviewed and verified.
Security Audits
| Gen Agent Trust Hub | Pass |
| Socket | Pass |
| Snyk | Pass |
🏢 Official
Published by the company or team that built the technology.