mcp-builder

mcp-builder is a skill for Claude Code from composio-community/awesome-claude-plugins. It costs 61 tokens per session (963 once invoked), scanned A, original, no licence file.

Guidance for creating MCP servers in Python or Node.js. MCP, or Model Context Protocol, lets language models interact with outside services through defined tools.

In plain words
What is it for?
Use it when building an MCP server with Python’s FastMCP or the Node.js/TypeScript MCP SDK.
Why use it?
It helps developers plan and implement the server, its tools, and its connection to external APIs or services.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the mcp-builder plugin — 1 skill shipped together

Good fit Use it when building an MCP server with Python’s FastMCP or the Node.js/TypeScript MCP SDK.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/composio-community/awesome-claude-plugins/mcp-builder
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add composio-community/awesome-claude-plugins --skill mcp-builder
Clone the repo
git clone --depth 1 https://github.com/composio-community/awesome-claude-plugins

Made for: Claude Code.

Or install mcp-builder, the plugin that ships this one along with the rest of its 1 skill.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for mcp-builder

README.md
[![agentmods](https://agentmods.dev/badge/skills/composio-community/awesome-claude-plugins/mcp-builder.svg)](https://agentmods.dev/skills/composio-community/awesome-claude-plugins/mcp-builder)
Your own site
<a href="https://agentmods.dev/skills/composio-community/awesome-claude-plugins/mcp-builder"><img src="https://agentmods.dev/badge/skills/composio-community/awesome-claude-plugins/mcp-builder.svg" alt="Measured on agentmods" height="20"></a>
Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 963 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • Socket pass 27 Jul 2026
  • Snyk warn 27 Jul 2026
How audits are shown
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00061 $0.00963
Opus 5 $0.00030 $0.00481
Sonnet 5 $0.00012 $0.00193
Haiku 4.5 $0.00006 $0.00096

Measured 9d ago against content hash 5d5b121c1cb0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

mcp-builder scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

mcp-builder/skills/mcp-builder/SKILL.md · 127 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 127 lines · 61 tokens per session scan A 5d5b121c1cb0

Subscribe to this mod's changes

mcp-builder is a skill published in the GitHub repository composio-community/awesome-claude-plugins (1,941 stars, last pushed 1mo ago), with no licence file. It adds 61 tokens to every session and 963 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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