A guide for creating MCP server integrations. MCP is a standard way for an agent to connect to outside tools such as Notion, a browser, or workflow software.

Use it when adding a new MCP server, defining its tools and arguments, reading tool descriptors, and connecting the agent to existing services.

It gives developers a consistent folder layout and tool description format, making integrations easier to discover and call correctly.

mcp-server — Skill for Claude Code and Codex by WellApp-ai: A guide for creating MCP server integrations.

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.

agentmods

npx agentmods add skills/wellapp-ai/well/mcp-server

Any agent

npx skills add WellApp-ai/Well --skill mcp-server

Clone the repo

git clone --depth 1 https://github.com/WellApp-ai/Well

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/wellapp-ai/well/mcp-server.svg)](https://agentmods.dev/skills/wellapp-ai/well/mcp-server)

Your own site

<a href="https://agentmods.dev/skills/wellapp-ai/well/mcp-server"><img src="https://agentmods.dev/badge/skills/wellapp-ai/well/mcp-server.svg" alt="Measured on agentmods" height="20"></a>

Per session 11 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 759 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00011	$0.00759
Opus 5	$0.00005	$0.00380
Sonnet 5	$0.00002	$0.00152
Haiku 4.5	$0.00001	$0.00076

Measured 6d ago against content hash 6044313b7117, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

mcp-server 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 6d 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.

cursor-rules/skills/mcp-server/SKILL.md · 135 lines

How it starts

The opening of the file, as written. The whole thing — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCP Server Creation Guide

Use this skill when creating a new MCP server integration.

MCP Folder Structure

MCPs live in: ~/.cursor/projects/<project>/mcps/<server-name>/

mcps/
├── user-notion/
│   └── tools/
│       ├── API-retrieve-a-page.json
│       └── ...
├── cursor-ide-browser/
│   └── tools/
│       ├── browser_navigate.json
│       └── ...
└── user-n8n-mcp/
    └── tools/
        └── ...

Tool Descriptor Format

Each tool is a JSON file:

{
  "name": "tool-name",
  "description": "What this tool does",
  "arguments": {
    "type": "object",
    "properties": {
      "param1": { "type": "string", "description": "..." }
    },
    "required": ["param1"]
  }
}

Usage Pattern

Read tool descriptor before calling
Use CallMcpTool with server, toolName, arguments
Handle response appropriately

Example Call

CallMcpTool:
  server: "user-notion"
  toolName: "API-retrieve-a-page"
  arguments: { "page_id": "abc123" }

Existing MCPs Reference

MCP	Capabilities
user-notion	Page/block CRUD, search, comments
cursor-ide-browser	Navigation, clicks, screenshots, console
user-n8n-mcp	Workflow search, details, execution
user-context7	Library docs lookup
figma	Design specs, code generation from frames

Creating a New MCP

Create folder: mcps/<server-name>/tools/
Add tool descriptors as JSON files
Configure server in ~/.cursor/mcp.json
Restart Cursor (Cmd+Shift+P > "Reload Window")
Test with CallMcpTool

Authentication Patterns

Pattern 1: API Token (env block)

For MCPs that use API keys (Notion, n8n):

"mcp-name": {
  "command": "npx",
  "args": ["-y", "@package/mcp-server"],
  "env": {
    "API_KEY": "your-token-here"
  }
}

Pattern 2: URL-based (no auth)

For MCPs that connect to local servers (Figma desktop):

"mcp-name": {
  "url": "http://127.0.0.1:PORT/mcp"
}

Pattern 3: OAuth (remote URL)

Read the full file on GitHub · 135 lines

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.

6d ago First seen · 135 lines · 11 tokens per session scan A 6044313b7117

Subscribe to this mod's changes

mcp-server is a skill published in the GitHub repository WellApp-ai/Well (340 stars, last pushed 29d ago), licensed MIT. It adds 11 tokens to every session and 759 once invoked, about $0.0001 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 2026-08-30.

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