The Code Explainer MCP is a Cloudflare Worker that serves as a Model Context Protocol server specifically designed for code explanation. It analyzes and explains code by providing comprehensive breakdowns of structure and functionality, including architecture diagrams, component analysis, and more.
Clone the repository:
git clone https://github.com/BillDuke13/code-explainer-mcp.git
cd code-explainer-mcp
Install dependencies:
npm install
Configure your secret key:
wrangler.jsonc and replace YOUR_SECRET_KEY_HERE with your chosen secret key, orwrangler secret put SHARED_SECRET
Deploy to Cloudflare Workers:
npm run deploy
Send a POST request to your worker URL with the following JSON body:
{
"method": "explainCode",
"params": ["your code here", "programming language"]
}
Include the Authorization header with your secret key:
Authorization: Bearer YOUR_SECRET_KEY_HERE
The response will be a JSON object with a result field containing the code analysis:
{
"result": "# Code Analysis for JavaScript Code\n\n## Architecture Diagram\n...\n\n## Core Functionality\n..."
}
async function explainCode(code, language) {
const response = await fetch('https://your-worker-url.workers.dev', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'Authorization': 'Bearer YOUR_SECRET_KEY_HERE',
},
body: JSON.stringify({
method: "explainCode",
params: [code, language]
}),
});
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const data = await response.json();
return data.result;
}
// Example usage
const jsCode = `function add(a, b) { return a + b; }`;
explainCode(jsCode, "javascript")
.then(explanation => console.log(explanation))
.catch(error => console.error('Error:', error));
import requests
import json
def explain_code(code, language, api_url, secret_key):
headers = {
'Content-Type': 'application/json',
'Authorization': f'Bearer {secret_key}'
}
payload = {
'method': 'explainCode',
'params': [code, language]
}
response = requests.post(api_url, headers=headers, json=payload)
response.raise_for_status()
return response.json()['result']
# Example usage
code = "def hello(): print('Hello, world!')"
explanation = explain_code(code, "python", "https://your-worker-url.workers.dev", "YOUR_SECRET_KEY_HERE")
print(explanation)
const axios = require('axios');
async function explainCode(code, language) {
try {
const response = await axios.post('https://your-worker-url.workers.dev', {
method: 'explainCode',
params: [code, language]
}, {
headers: {
'Content-Type': 'application/json',
'Authorization': 'Bearer YOUR_SECRET_KEY_HERE'
}
});
return response.data.result;
} catch (error) {
console.error('Error:', error.response ? error.response.data : error.message);
throw error;
}
}
// Example usage
const codeToAnalyze = `
class Person {
constructor(name) {
this.name = name;
}
sayHello() {
return \`Hello, my name is \${this.name}\`;
}
}
`;
explainCode(codeToAnalyze, 'javascript')
.then(explanation => console.log(explanation))
.catch(err => console.error('Failed to explain code:', err));
You can test the service locally before deployment:
wrangler dev
Then test the endpoint using curl:
curl -X POST http://localhost:8787 \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_SECRET_KEY_HERE" \
-d '{"method":"explainCode","params":["function hello() { return \"Hello World\"; }","javascript"]}'
To add this MCP server to Claude Code, run this command in your terminal:
claude mcp add-json "code-explainer" '{"command":"npx","args":["-y","code-explainer-mcp"]}'See the official Claude Code MCP documentation for more details.
There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.
If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.
To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".
When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:
{
"mcpServers": {
"code-explainer": {
"command": "npx",
"args": [
"-y",
"code-explainer-mcp"
]
}
}
}To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.
Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.
The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.
You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.
To add this MCP server to Claude Desktop:
1. Find your configuration file:
~/Library/Application Support/Claude/claude_desktop_config.json%APPDATA%\Claude\claude_desktop_config.json~/.config/Claude/claude_desktop_config.json2. Add this to your configuration file:
{
"mcpServers": {
"code-explainer": {
"command": "npx",
"args": [
"-y",
"code-explainer-mcp"
]
}
}
}3. Restart Claude Desktop for the changes to take effect