mcp-builder

mcp-builder is a skill for Claude Code, Codex from anujkumar8076/skill-router-mcp. It costs 32 tokens per session (79 once invoked), scanned A, original, MIT.

A guide for building MCP servers with the official software kit. MCP is a standard that lets AI agents use tools connected to services such as APIs or databases.

In plain words
What is it for?
It helps create tool definitions with input rules, choose local or web connections, and connect external services to an MCP server.
Why use it?
It provides a defined approach for exposing outside services to agents instead of designing the connection from scratch.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit It helps create tool definitions with input rules, choose local or web connections, and connect external services to an MCP server.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/anujkumar8076/skill-router-mcp/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 anujkumar8076/skill-router-mcp --skill mcp-builder
Clone the repo
git clone --depth 1 https://github.com/anujkumar8076/skill-router-mcp

Made for: Claude Code, Codex.

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/anujkumar8076/skill-router-mcp/mcp-builder/github.svg)](https://agentmods.dev/skills/anujkumar8076/skill-router-mcp/mcp-builder)
Your own site
<a href="https://agentmods.dev/skills/anujkumar8076/skill-router-mcp/mcp-builder"><img src="https://agentmods.dev/badge/skills/anujkumar8076/skill-router-mcp/mcp-builder/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for mcp-builder

Your own site · 80×15
<a href="https://agentmods.dev/skills/anujkumar8076/skill-router-mcp/mcp-builder"><img src="https://agentmods.dev/badge/skills/anujkumar8076/skill-router-mcp/mcp-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 79 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.
Origin original 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 $0.00032 $0.00079
Opus 5 $0.00016 $0.00039
Sonnet 5 $0.00006 $0.00016
Haiku 4.5 $0.00003 $0.00008

Measured 8d ago against content hash f85e12a0a20d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, 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 8d 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.

benchmark/skills/mcp-builder/SKILL.md · 10 lines

What it actually says

MCP Builder

Scaffold MCP servers with the official SDK: define tools with schemas, wire transports (stdio or HTTP), and connect external services safely.

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. 8d ago First seen · 10 lines · 32 tokens per session scan A f85e12a0a20d

Subscribe to this mod's changes

mcp-builder is a skill published in the GitHub repository anujkumar8076/skill-router-mcp (0 stars, last pushed 2mo ago), licensed MIT. It adds 32 tokens to every session and 79 once invoked, about $0.0002 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 2026-08-31.

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