MCP Development protocol
Defines the protocol and steps for developing MCP (Model Context Protocol) servers.
---
description: Defines the protocol and steps for developing MCP (Model Context Protocol) servers.
author: https://github.com/nickbaumann98
version: 1.0
tags: ["mcp", "development", "protocol", "server", "integration"]
globs: ["*"]
---
# MCP Server Development Protocol
⚠️ CRITICAL: DO NOT USE attempt_completion BEFORE TESTING ⚠️
## Step 1: Planning (PLAN MODE)
- What problem does this tool solve?
- What API/service will it use?
- What are the authentication requirements?
□ Standard API key
□ OAuth (requires separate setup script)
□ Other credentials
## Step 2: Implementation (ACT MODE)
1. Bootstrap
- For web services, JavaScript integration, or Node.js environments:
```bash
npx @modelcontextprotocol/create-server my-server
cd my-server
npm install
```
- For data science, ML workflows, or Python environments:
```bash
pip install mcp
# Or with uv (recommended)
uv add "mcp[cli]"
```
2. Core Implementation
- Use MCP SDK
- Implement comprehensive logging
- TypeScript (for web/JS projects):
```typescript
console.error('[Setup] Initializing server...');
console.error('[API] Request to endpoint:', endpoint);
console.error('[Error] Failed with:', error);
```
- Python (for data science/ML projects):
```python
import logging
logging.error('[Setup] Initializing server...')
logging.error(f'[API] Request to endpoint: {endpoint}')
logging.error(f'[Error] Failed with: {str(error)}')
```
- Add type definitions
- Handle errors with context
- Implement rate limiting if needed
3. Configuration
- Get credentials from user if needed
- Add to MCP settings:
- For TypeScript projects:
```json
{
"mcpServers": {
"my-server": {
"command": "node",
"args": ["path/to/build/index.js"],
"env": {
"API_KEY": "key"
},
"disabled": false,
"autoApprove": []
}
}
}
```
- For Python projects:
```bash
# Directly with command line
mcp install server.py -v API_KEY=key
# Or in settings.json
{
"mcpServers": {
"my-server": {
"command": "python",
"args": ["server.py"],
"env": {
"API_KEY": "key"
},
"disabled": false,
"autoApprove": []
}
}
}
```
## Step 3: Testing (BLOCKER ⛔️)
<thinking>
BEFORE using attempt_completion, I MUST verify:
□ Have I tested EVERY tool?
□ Have I confirmed success from the user for each test?
□ Have I documented the test results?
If ANY answer is "no", I MUST NOT use attempt_completion.
</thinking>
1. Test Each Tool (REQUIRED)
□ Test each tool with valid inputs
□ Verify output format is correct
⚠️ DO NOT PROCEED UNTIL ALL TOOLS TESTED
## Step 4: Completion
❗ STOP AND VERIFY:
□ Every tool has been tested with valid inputs
□ Output format is correct for each tool
Only after ALL tools have been tested can attempt_completion be used.
## Key Requirements
- ✓ Must use MCP SDK
- ✓ Must have comprehensive logging
- ✓ Must test each tool individually
- ✓ Must handle errors gracefully
- ⛔️ NEVER skip testing before completion
Created: 7/2/2025
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