MCP Builder Agent Plugin

Design and build high-quality Model Context Protocol servers with clear tool contracts, TypeScript or Python patterns, transport guidance, and evaluation methods.

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0 repository stars Apache-2.0 Updated Aug 8, 2026

Reviewed seed

tools

with contracts.

A small, clear surface between the model and an external service, designed for safe and reliable use.

Copy the complete MCP Builder package

Sparse-clone the plugin directory and load it in a compatible client. The package contains guidance and evaluation helpers, not a preconfigured MCP server.

Installation

Install Plugin

Choose Codex or Copilot, click Copy, paste the two lines into a terminal, and press Enter.The installation commands are identical on Windows, macOS, and Linux.

codex plugin marketplace add agentplugin-net/portable-agent-plugins
codex plugin add mcp-builder@agentplugin-net

Explainable standards check

Latest official standard could not be confirmed

Official latest version: 1.0.0 (Working Draft). The value is read from the official specification and cached for one day.

Read the official specification

This is a static package-format check, not a security audit, quality score, malware scan, or guarantee of client compatibility.

Source package available for inspection

The package could not be checked: plugin.json returned 403.

Static source inspection

Capabilities

What can you do with MCP Builder?

Turn an external service into a well-designed MCP surface.

Use this plugin when building an MCP server and the difficult work is choosing tool boundaries, schemas, transports, error handling, and evaluation criteria.

Research the service and current MCP guidance.
Design focused tools with clear input and output schemas.
Implement TypeScript or Python server patterns.
Choose streamable HTTP or stdio deliberately.
Evaluate tool usability, errors, security, and documentation.

Design tools for model use

Tool names, descriptions, schemas, outputs, and error messages are treated as the product surface rather than incidental wrappers.

Make trust boundaries explicit

Authentication, network access, file operations, side effects, validation, and deployment concerns remain part of the design review.

Practical workflow

From service research to evaluated MCP server

Pass 01 / Design

Define tasks and tool contracts

Study the service, identify user goals, choose transport, and specify a small set of composable tools.

Pass 02 / Prove

Implement and evaluate

Build with the appropriate SDK, test normal and failure paths, run evaluations, and document setup and limitations.

Package contents

What is included in MCP Builder?

MCP Builder declares 1 Skill, 0 MCP configurations, and 2 additional resources. The included-file links below point to the reviewed source repository.

Agent Skills

mcp-builder

MCP servers

No runtime service

Package format

Agent Plugins

Official latest 1.0.0

plugin.json

Portable Agent Plugins 1.0 manifest.

SKILL.md

MCP research, design, implementation, testing, and evaluation workflow.

LICENSE.txt

Apache 2.0 license shipped with the standalone package.

Synced source content

Repository README

View original README

This README snapshot is stored by Agent Plugins Hub and refreshed by the daily GitHub synchronization pipeline. Remote images and embedded content are not loaded.

Source: https://github.com/agentplugin-net/portable-agent-plugins#readme

This repository does not currently provide a README snapshot. The plugin instructions below remain available.

Source documentation

MCP server development guide

Request update View raw SKILL.md

Rendered from the linked GitHub source. Raw HTML is disabled, scripts cannot execute, remote images are omitted, and external links open separately.

MCP Builder