Agent skill

MCP Server Builder

by alirezarezvani in alirezarezvani/claude-skills

Design and ship production-ready MCP (Model Context Protocol) servers from OpenAPI contracts instead of hand-written tool wrappers.

MITAuto-check passedAgent Workflows

Install MCP Server Builder

skills CLI

$ npx skills add alirezarezvani/claude-skills --skill mcp-server-builder -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install alirezarezvani/claude-skills mcp-server-builder --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/alirezarezvani/claude-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/engineering/skills/mcp-server-builder .claude/skills/mcp-server-builder && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "mcp-server-builder" agent skill from https://github.com/alirezarezvani/claude-skills/tree/main/engineering/skills/mcp-server-builder into .claude/skills/mcp-server-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-server-builder", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/alirezarezvani/claude-skills/tree/main/engineering/skills/mcp-server-builder

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add alirezarezvani/claude-skills --skill mcp-server-builder -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install alirezarezvani/claude-skills mcp-server-builder --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/alirezarezvani/claude-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/engineering/skills/mcp-server-builder .agents/skills/mcp-server-builder && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "mcp-server-builder" agent skill from https://github.com/alirezarezvani/claude-skills/tree/main/engineering/skills/mcp-server-builder into .agents/skills/mcp-server-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-server-builder", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add alirezarezvani/claude-skills --skill mcp-server-builder -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install alirezarezvani/claude-skills mcp-server-builder --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/alirezarezvani/claude-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/engineering/skills/mcp-server-builder .cursor/skills/mcp-server-builder && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "mcp-server-builder" agent skill from https://github.com/alirezarezvani/claude-skills/tree/main/engineering/skills/mcp-server-builder into .cursor/skills/mcp-server-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-server-builder", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/alirezarezvani/claude-skills.git --path engineering/skills/mcp-server-builder

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add alirezarezvani/claude-skills --skill mcp-server-builder -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install alirezarezvani/claude-skills mcp-server-builder --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/alirezarezvani/claude-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/engineering/skills/mcp-server-builder .gemini/skills/mcp-server-builder && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "mcp-server-builder" agent skill from https://github.com/alirezarezvani/claude-skills/tree/main/engineering/skills/mcp-server-builder into .gemini/skills/mcp-server-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-server-builder", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install alirezarezvani/claude-skills mcp-server-builder

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add alirezarezvani/claude-skills --skill mcp-server-builder -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/alirezarezvani/claude-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/engineering/skills/mcp-server-builder .github/skills/mcp-server-builder && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "mcp-server-builder" agent skill from https://github.com/alirezarezvani/claude-skills/tree/main/engineering/skills/mcp-server-builder into .github/skills/mcp-server-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-server-builder", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add alirezarezvani/claude-skills --skill mcp-server-builder -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install alirezarezvani/claude-skills mcp-server-builder --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/alirezarezvani/claude-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/engineering/skills/mcp-server-builder .opencode/skills/mcp-server-builder && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "mcp-server-builder" agent skill from https://github.com/alirezarezvani/claude-skills/tree/main/engineering/skills/mcp-server-builder into .opencode/skills/mcp-server-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-server-builder", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: mcp-server-builder
GitHub stars: 28k
Token cost: ~985 tokens
SKILL.md length: 348 words
Files: 9 (incl. scripts, references)
Skills in repo: 342
Repo updated: Aug 30, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Design and ship production-ready MCP (Model Context Protocol) servers from OpenAPI contracts instead of hand-written tool wrappers.

Works in 4 steps: OpenAPI to MCP Scaffold → Validate MCP Tool Definitions → Runtime Selection → …
Exposing an existing API as an MCP server
SKILL.md covers Overview, Core Capabilities, When to Use and Key Workflows, plus 2 more sections
Runs Python scripts from its folder; calls python3

What it does

MCP Server Builder is an agent skill from alirezarezvani/claude-skills. Design and ship production-ready MCP (Model Context Protocol) servers from OpenAPI contracts instead of hand-written tool wrappers. Python and TypeScript support, schema validation, safe evolution. Use when exposing an existing API as an MCP server, building tool integrations for Claude or Codex or Cursor, or scaffolding an MCP project from scratch.

Its SKILL.md is about 990 tokens, which your agent loads only when the skill is triggered. The skill folder holds 10 other files, including scripts and reference files (for example `README.md`, `references/openapi-extraction-guide.md` and `references/production-hardening-guide.md`).

It sits in Agent Workflows, covering MCP servers, OpenAPI specifications and Project scaffolding. It works with Model Context Protocol, OpenAPI, Python and TypeScript. The repository describes itself as: 380 Claude Code skills & agent skills & plugins (30+ Agents, 70+ custom commands, 380+ skills, customizable references, scripts)for Claude Code, Codex, Gemini CLI, Cursor, and 8… The licence is MIT.

When your agent uses it

Exposing an existing API as an MCP server
Building tool integrations for Claude
Scaffolding an MCP project from scratch

Example prompts

“/mcp-server-builder”

Requirements

Python 3

Workflow steps

4 steps, taken from the step headings in SKILL.md.

OpenAPI to MCP Scaffold
Validate MCP Tool Definitions
Runtime Selection
Harden for Production

What it can do on your machine

Read from SKILL.md and the folder at commit 19392f7. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 2 files in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
- python3
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

MCP Server Builder loads about 985 tokens when it runs, and up to ~2.5k if it reads all its reference files. Until then it costs about 93 tokens; SKILL.md has 348 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~93
When it runs · the whole SKILL.md, loaded when a task matches: ~985
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~2.5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from alirezarezvani/claude-skills at commit 19392f7, republished under its MIT licence (© alirezarezvani). 348 words, ~985 tokens.

Download SKILL.mdSave it as .claude/skills/mcp-server-builder/SKILL.md (or your agent's skills folder). This skill also uses 8 other files; get the full folder from GitHub.

name: mcp-server-builder
description: Design and ship production-ready MCP (Model Context Protocol) servers from OpenAPI contracts instead of hand-written tool wrappers. Python and TypeScript support, schema validation, safe evolution. Use when exposing an existing API as an MCP server, building tool integrations for Claude or Codex or Cursor, or scaffolding an MCP project from scratch.

MCP Server Builder

Tier: POWERFUL · Category: Engineering · Domain: AI / API Integration

Overview

Use this skill to design and ship production-ready MCP servers from API contracts instead of hand-written one-off tool wrappers. It focuses on fast scaffolding, schema quality, validation, and safe evolution.

The workflow supports both Python and TypeScript MCP implementations and treats OpenAPI as the source of truth.

Core Capabilities

Convert OpenAPI paths/operations into MCP tool definitions
Generate starter server scaffolds (Python or TypeScript)
Enforce naming, descriptions, and schema consistency
Validate MCP tool manifests for common production failures
Apply versioning and backward-compatibility checks
Separate transport/runtime decisions from tool contract design

When to Use

You need to expose an internal/external REST API to an LLM agent
You are replacing brittle browser automation with typed tools
You want one MCP server shared across teams and assistants
You need repeatable quality checks before publishing MCP tools
You want to bootstrap an MCP server from existing OpenAPI specs

Key Workflows

1. OpenAPI to MCP Scaffold

Start from a valid OpenAPI spec.
Generate tool manifest + starter server code.
Review naming and auth strategy.
Add endpoint-specific runtime logic.

bash

python3 scripts/openapi_to_mcp.py \
  --input openapi.json \
  --server-name billing-mcp \
  --language python \
  --output-dir ./out \
  --format text

Supports stdin as well:

bash

cat openapi.json | python3 scripts/openapi_to_mcp.py --server-name billing-mcp --language typescript

2. Validate MCP Tool Definitions

Run validator before integration tests:

bash

python3 scripts/mcp_validator.py --input out/tool_manifest.json --strict --format text

Checks include duplicate names, invalid schema shape, missing descriptions, empty required fields, and naming hygiene.

3. Runtime Selection

Choose Python for fast iteration and data-heavy backends.
Choose TypeScript for unified JS stacks and tighter frontend/backend contract reuse.
Keep tool contracts stable even if transport/runtime changes.

4. Harden for Production

Key items before publishing:

Keep secrets in env vars, not tool schemas
Prefer outbound host allowlists over open proxies
Use additive-only changes; never rename tool names in-place

Full hardening guidance: references/production-hardening-guide.md.

Script Interfaces

python3 scripts/openapi_to_mcp.py --help
- Reads OpenAPI from stdin or --input
- Produces manifest + server scaffold
- Emits JSON summary or text report
python3 scripts/mcp_validator.py --help
- Validates manifests and optional runtime config
- Returns non-zero exit in strict mode when errors exist

Reference Material

references/production-hardening-guide.md — auth & safety design, versioning strategy, common pitfalls, best practices, architecture decisions, contract quality gates, testing strategy, deployment practices, security controls
references/openapi-extraction-guide.md
references/python-server-template.md
references/typescript-server-template.md
references/validation-checklist.md
README.md

Files

SKILL.md and 8 other files (scripts, references) in engineering/skills/mcp-server-builder of alirezarezvani/claude-skills.

SKILL.md
README.md
references/openapi-extraction-guide.md
references/production-hardening-guide.md
references/python-server-template.md
references/typescript-server-template.md
references/validation-checklist.md
scripts/mcp_validator.py
scripts/openapi_to_mcp.py

Open the folder on GitHubat commit 19392f7

Compare with similar skills

MCP Server Builder next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

MCP Server Builder compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
MCP Server Builder this skillalirezarezvani/claude-skills	28k	—	~985	Automated safety check: Pass	MIT	1 mo ago
MCP Server Builderborghei/Claude-Skills	881	—	~1.9k	Automated safety check: Pass	MIT	yesterday
Kingdee MCP DevWaHaiLong/KingdeeMCP	103	—	~853	Automated safety check: Pass	MIT	1 mo ago
Generate MCP Servertrycompai/comp	2k	—	~2.7k	Automated safety check: Pass	Apache-2.0	yesterday
OpenAPI to MCP Servermcp-use/mcp-use	11k	—	~5.2k	Automated safety check: Pass	Apache-2.0	today
SpikardGoldziher/spikard	123	—	~799	Automated safety check: Pass	MIT	5 days ago

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Works with

Questions about MCP Server Builder

What does MCP Server Builder do?

Design and ship production-ready MCP (Model Context Protocol) servers from OpenAPI contracts instead of hand-written tool wrappers. MCP Server Builder is an agent skill from alirezarezvani/claude-skills. Design and ship production-ready MCP (Model Context Protocol) servers from OpenAPI contracts instead of hand-written tool wrappers.

When should I use MCP Server Builder?

MCP Server Builder fits situations like: exposing an existing API as an MCP server; building tool integrations for Claude; scaffolding an MCP project from scratch.

How do I install MCP Server Builder in Claude Code?

Run `npx skills add alirezarezvani/claude-skills --skill mcp-server-builder -a claude-code`. Or copy the skill folder (engineering/skills/mcp-server-builder in alirezarezvani/claude-skills) into .claude/skills/mcp-server-builder in your project. Claude Code loads it when a task matches its description.

How do I install MCP Server Builder in Codex?

Run `npx skills add alirezarezvani/claude-skills --skill mcp-server-builder -a codex`. Or copy the skill folder (engineering/skills/mcp-server-builder in alirezarezvani/claude-skills) into .agents/skills/mcp-server-builder in your project. Codex loads it when a task matches its description.

Can I use MCP Server Builder in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add alirezarezvani/claude-skills --skill mcp-server-builder -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mcp-server-builder, .gemini/skills/mcp-server-builder, .github/skills/mcp-server-builder and .opencode/skills/mcp-server-builder in your project.

What does MCP Server Builder need to run?

Going by SKILL.md and its folder, MCP Server Builder needs Python for the scripts in its folder and the command-line tools its instructions call (python3). Our summary lists: Python 3.

Does MCP Server Builder access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is MCP Server Builder safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does MCP Server Builder use?

MCP Server Builder is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does MCP Server Builder use?

About 985 tokens (SKILL.md is roughly 3.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.5k tokens, read only when the agent opens those files.

What are the alternatives to MCP Server Builder?

Skills that share tags, products or a category with MCP Server Builder: MCP Server Builder (borghei/Claude-Skills, 881 stars), Kingdee MCP Dev (WaHaiLong/KingdeeMCP, 103 stars), Generate MCP Server (trycompai/comp, 2k stars) and OpenAPI to MCP Server (mcp-use/mcp-use, 11k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains MCP Server Builder?

alirezarezvani (a GitHub user) maintains it in alirezarezvani/claude-skills, which has 27,829 GitHub stars. The repository holds 342 skills in this directory. The repository was last updated on August 30, 2026.

Source: alirezarezvani/claude-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install MCP Server Builder

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

MCP Server Builder

Overview

Core Capabilities

When to Use

Key Workflows

1. OpenAPI to MCP Scaffold

2. Validate MCP Tool Definitions

3. Runtime Selection

4. Harden for Production

Script Interfaces

Reference Material

Files

Compare with similar skills

Similar skills

More from alirezarezvani/claude-skills

Related

Questions about MCP Server Builder