mcp-server-builder

# 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

1. Start from a valid OpenAPI spec.
2. Generate tool manifest + starter server code.
3. Review naming and auth strategy.
4. 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

-...

# MCP Server Builder

Generate and validate MCP servers from OpenAPI contracts with production-focused tooling. This skill helps teams bootstrap fast and enforce schema quality before shipping.

## Quick Start

```bash
# Generate scaffold from OpenAPI
python3 scripts/openapi_to_mcp.py \
  --input openapi.json \
  --server-name my-mcp \
  --language python \
  --output-dir ./generated \
  --format text

# Validate generated manifest
python3 scripts/mcp_validator.py --input generated/tool_manifest.json --strict --format text
```

## Included Tools

- `scripts/openapi_to_mcp.py`: OpenAPI -> `tool_manifest.json` + starter server scaffold
- `scripts/mcp_validator.py`: structural and quality validation for MCP tool definitions

## References

- `references/openapi-extraction-guide.md`
- `references/python-server-template.md`
- `references/typescript-server-template.md`
- `references/validation-checklist.md`

## Installation

### Claude Code

```bash
cp -R engineering/mcp-server-builder ~/.claude/skills/mcp-server-builder
```

### OpenAI Codex

```bash
cp -R engineering/mcp-server-builder ~/.codex/skills/mcp-server-builder
```

### OpenClaw

```bash
cp -R engineering/mcp-server-builder ~/.openclaw/skills/mcp-server-builder
```