mcp-builder SKILL.md skillA

mcp-builder from platonai/browser4 is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add platonai/browser4/mcp-builder@git:20260526.099a5a1

Pins git:20260526.099a5a1 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: platonai/browser4
Path: browser4-agentic/src/main/resources/skills/mcp-builder/SKILL.md
Versions recorded: 2
Latest version: git:20260526.099a5a1, committed May 26, 2026
First version recorded: Apr 19, 2026
Size: 9,139 bytes
Repository stars: 1,164
License: Apache-2.0

Guide for creating advanced-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# MCP Server Development Guide

## Overview

Create MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. The quality of an MCP server is measured by how well it enables LLMs to accomplish real-world tasks.

---

# Process

## 🚀 High-Level Workflow

Creating a high-quality MCP server involves four main phases:

### Phase 1: Deep Research and Planning

#### 1.1 Understand Modern MCP Design

**API Coverage vs. Workflow Tools:**
Balance comprehensive API endpoint coverage with specialized workflow tools. Workflow tools can be more convenient for specific tasks, while comprehensive coverage gives agents flexibility to compose operations. Performance varies by client—some clients benefit from code execution that combines basic tools, while others work better with higher-level workflows. When uncertain, prioritize comprehensive API coverage.

**Tool Naming and Discoverability:**
Clear, descriptive tool names help agents find the right tools quickly. Use consistent prefixes (e.g., `github_create_issue`, `github_list_repos`) and action-oriented naming.

**Context Management:**
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add platonai/browser4/mcp-builder@sha256:f9825d26803917e6

The line at the top of this page pins the label git:20260526.099a5a1, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_6kplet2zuvhakypq.svg)](https://markdownregistry.com/a/art_6kplet2zuvhakypq)

3 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 2 versions of this file, between Apr 19, 2026 and May 26, 2026, about one every 37 days.

version	committed	commit	size	audit
git:20260526.099a5a1 latest	2026-05-26	099a5a1	9,139 B	A	view · diff
git:20260419.dcd5a6b	2026-04-19	dcd5a6b	9,135 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (9139 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

platonai/browser4 · 1,164 stars · license Apache-2.0 · pushed 2026-10-18 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_6kplet2zuvhakypq
GET https://markdownregistry.com/api/v1/resolve?ref=platonai/browser4/mcp-builder
GET https://markdownregistry.com/api/v1/blob/f9825d26803917e6ae6e1b44c2a2ca5e2cfe3a97ead241a3800226f3fe9de9f2

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

More from platonai/browser4

issues-batch-fix SKILL.md skill

platonai/browser4 · .trae/skills/issues-batch-fix/SKILL.md · Fix Browser4 test-issue reports under coworker/tasks/issues/draft via the locate-fix-verify-docs loop. Use when the…

git:20261005.8889a9b · audit A · 1,164 stars

AGENTS.md AGENTS.md file

platonai/browser4 · AGENTS.md

git:20261007.d600238 · audit A · 1,164 stars

CLAUDE.md CLAUDE.md file

platonai/browser4 · CLAUDE.md

git:20260806.5de4fd9 · audit A · 1,164 stars

data-validation SKILL.md skill

platonai/browser4 · browser4-agentic/src/main/resources/skills/data-validation/SKILL.md · Validates data against common and custom rules (required fields, formats, ranges). Use when checking data quality…