2587 words
13 minutes
Building an MCP Server from Scratch — Day 4: Authentication & Production Hardening
2026-06-09
ai-agents
mcp
/
tutorial
/
authentication
/
security
/
typescript
/
express
/
production
/
rate-limiting

Day 3 gave us a working SSE server over HTTP and Docker. But right now anyone who knows the URL can talk to your MCP server. Your GitHub token is exposed to anyone who connects.

In production, you need:

  1. Authentication — Only authorized clients connect
  2. Rate limiting — Prevent abuse and API cost spikes
  3. CORS — Control which origins can access
  4. Input validation — Reject malformed requests early
  5. Environment validation — Fail fast on misconfiguration
  6. Graceful shutdown — Properly close connections on restart

Let’s harden the server.

Step 1: Authentication Middleware#

We’ll add API key authentication via header. Each client gets a unique key. The server checks every SSE connection and every message POST against it.

Install dependencies (none new — we use built-in crypto):

Terminal window
cd github-issue-mcp
npm ls express @modelcontextprotocol/sdk zod

Create src/auth.ts#

// src/auth.ts — API key authentication


import crypto from "crypto";


/**
 * Simple API key authentication.
 * Keys configured via AUTH_KEYS env var (comma-separated).
 */
export class AuthService {
  private validKeys: Set<string>;


  constructor() {
    const keysFromEnv = process.env.AUTH_KEYS;
    if (keysFromEnv) {
      this.validKeys = new Set(keysFromEnv.split(",").map((k) => k.trim()));
      console.error(`🔑 Auth configured: ${this.validKeys.size} API key(s)`);
    } else {
      // Development mode — generate random key
      const defaultKey = crypto.randomBytes(32).toString("hex");
      this.validKeys = new Set([defaultKey]);
      console.error(`🔑 No AUTH_KEYS set. Generated dev key:`);
      console.error(`   ${defaultKey}`);
    }
  }


  validate(apiKey: string | undefined): boolean {
    if (!apiKey) return false;
    return this.validKeys.has(apiKey);
  }


  middleware() {
    return (req: any, res: any, next: any) => {
      const apiKey = req.headers["x-api-key"] as string | undefined;
      if (!apiKey) {
        res.status(401).json({ error: "Missing X-API-Key header" });
        return;
      }
      if (!this.validate(apiKey)) {
        res.status(403).json({ error: "Invalid API key" });
        return;
      }
      // Store key on request for rate limiter
      req.apiKey = apiKey;
      next();
    };
  }
}

What this does:#

  • Reads API keys from AUTH_KEYS env var (comma-separated)
  • Dev mode: generates a random 64-char hex key
  • Middleware returns 401 if header missing, 403 if invalid key
  • Stores the validated key on req.apiKey for downstream middleware

Usage:#

Terminal window
export AUTH_KEYS="sk-mcp-dev-abc123,sk-mcp-dev-xyz789"
node build/server.js
Terminal window
curl -H "X-API-Key: sk-mcp-dev-abc123" http://localhost:3001/sse

Step 2: Rate Limiting#

Without rate limiting, a rogue client could hammer your server, burning through GitHub API quota and compute costs.

Create src/rate-limit.ts#

// src/rate-limit.ts — Sliding-window rate limiter


export class RateLimiter {
  private buckets: Map<string, { count: number; windowStart: number }> = new Map();
  private maxRequests: number;
  private windowMs: number;


  constructor(maxRequests: number = 60, windowMs: number = 60_000) {
    this.maxRequests = maxRequests;
    this.windowMs = windowMs;
    console.error(`⏱️ Rate limit: ${maxRequests} req / ${windowMs / 1000}s`);
  }


  check(apiKey: string): boolean {
    const now = Date.now();
    const bucket = this.buckets.get(apiKey);


    if (!bucket || now - bucket.windowStart >= this.windowMs) {
      this.buckets.set(apiKey, { count: 1, windowStart: now });
      return true;
    }


    if (bucket.count >= this.maxRequests) return false;
    bucket.count++;
    return true;
  }


  cleanup() {
    const now = Date.now();
    for (const [key, bucket] of this.buckets) {
      if (now - bucket.windowStart >= this.windowMs) {
        this.buckets.delete(key);
      }
    }
  }


  middleware() {
    return (req: any, res: any, next: any) => {
      const apiKey = req.apiKey || "anonymous";
      if (!this.check(apiKey)) {
        res.status(429).json({ error: "Too many requests", retryAfterMs: this.windowMs });
        return;
      }
      next();
    };
  }
}

Why rate limiting matters:#

ScenarioWithout LimitWith Limit
Malicious clientUnlimited calls → API costs spikeBlocked after 60/min
Buggy agent loopcreate_issue foreverBlocked, developer debugs
Multiple clientsOne hogs all resourcesEach gets fair share

Step 3: CORS Configuration#

CORS controls which web origins can access your SSE endpoint. For Claude Desktop (not a browser) this isn’t needed. For a web UI, it’s required.

Create src/cors.ts#

// src/cors.ts — CORS middleware


export function corsMiddleware(allowedOrigins: string[] = ["*"]) {
  return (req: any, res: any, next: any) => {
    const origin = req.headers.origin;


    if (allowedOrigins.includes("*")) {
      res.setHeader("Access-Control-Allow-Origin", "*");
    } else if (origin && allowedOrigins.includes(origin)) {
      res.setHeader("Access-Control-Allow-Origin", origin);
    }


    if (req.method === "OPTIONS") {
      res.setHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS");
      res.setHeader("Access-Control-Allow-Headers", "Content-Type, X-API-Key");
      res.setHeader("Access-Control-Max-Age", "86400");
      res.status(204).end();
      return;
    }


    next();
  };
}

Step 4: Environment Validation#

Fail fast is better than fail mysteriously. Validate all required config at startup.

Create src/env.ts#

// src/env.ts — Environment validation


export interface AppConfig {
  port: number;
  githubToken: string;
  authKeys: string[];
  rateLimitMax: number;
  rateLimitWindowMs: number;
  allowedOrigins: string[];
  nodeEnv: string;
}


export function loadConfig(): AppConfig {
  const errors: string[] = [];


  const githubToken = process.env.GITHUB_TOKEN;
  if (!githubToken) errors.push("GITHUB_TOKEN is required");


  const authKeysStr = process.env.AUTH_KEYS;
  if (!authKeysStr && process.env.NODE_ENV === "production") {
    errors.push("AUTH_KEYS is required in production mode");
  }


  const port = parseInt(process.env.PORT || "3001", 10);
  if (isNaN(port) || port <= 0 || port > 65535) {
    errors.push("PORT must be 1-65535");
  }


  if (errors.length > 0) {
    console.error("❌ Configuration errors:");
    errors.forEach((e) => console.error(`   - ${e}`));
    console.error("\nRequired: GITHUB_TOKEN");
    console.error("Production: AUTH_KEYS");
    console.error("Optional: PORT, RATE_LIMIT_MAX, RATE_LIMIT_WINDOW_MS, ALLOWED_ORIGINS, NODE_ENV");
    process.exit(1);
  }


  const authKeys = authKeysStr
    ? authKeysStr.split(",").map((k) => k.trim()).filter(Boolean)
    : [];


  console.error(`✅ Config validated | Port: ${port} | Auth: ${authKeys.length || "auto"} keys`);


  return {
    port,
    githubToken: githubToken!,
    authKeys,
    rateLimitMax: parseInt(process.env.RATE_LIMIT_MAX || "60", 10),
    rateLimitWindowMs: parseInt(process.env.RATE_LIMIT_WINDOW_MS || "60000", 10),
    allowedOrigins: process.env.ALLOWED_ORIGINS
      ? process.env.ALLOWED_ORIGINS.split(",").map((s) => s.trim())
      : ["*"],
    nodeEnv: process.env.NODE_ENV || "development",
  };
}

Step 5: Graceful Shutdown#

When your server restarts (or receives SIGTERM/SIGINT), you need to:

  1. Stop accepting new connections
  2. Wait for existing SSE streams to complete
  3. Close the HTTP server
  4. Exit cleanly

Update src/sse-server.ts with middleware support + shutdown:#

// src/sse-server.ts — Updated with middleware + graceful shutdown


import express from "express";
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";


export interface SSEServerInstance {
  server: import("http").Server;
  shutdown: () => Promise<void>;
  getActiveConnections: () => number;
}


export function createSSEServer(
  mcpServer: McpServer,
  port: number = 3001,
  configureMiddleware?: (app: express.Application) => void
): SSEServerInstance {
  const app = express();


  // Apply middleware first (auth, cors, rate limit, etc.)
  if (configureMiddleware) configureMiddleware(app);


  const transports: Map<string, SSEServerTransport> = new Map();


  app.get("/sse", async (req, res) => {
    const transport = new SSEServerTransport("/messages", res);
    transports.set(transport.sessionId, transport);


    res.on("close", () => {
      transports.delete(transport.sessionId);
      console.error(`[SSE] Session closed: ${transport.sessionId}`);
    });


    try {
      await mcpServer.connect(transport);
    } catch (error) {
      console.error(`[SSE] Connect error: ${error}`);
      res.status(500).end();
    }
  });


  app.post("/messages", express.json(), async (req, res) => {
    const sessionId = req.query.sessionId as string;
    const transport = transports.get(sessionId);
    if (!transport) {
      res.status(404).json({ error: "Session not found" });
      return;
    }
    await transport.handlePostMessage(req, res);
  });


  app.get("/health", (req, res) => {
    res.json({
      status: "ok",
      uptime: process.uptime(),
      activeConnections: transports.size,
    });
  });


  const httpServer = app.listen(port, () => {
    console.error(`✅ MCP SSE server on port ${port}`);
  });


  async function shutdown(): Promise<void> {
    console.error("Shutting down...");
    transports.clear();
    return new Promise((resolve) => {
      httpServer.close(() => {
        console.error("HTTP server closed");
        resolve();
      });
    });
  }


  return { server: httpServer, shutdown, getActiveConnections: () => transports.size };
}

The key change: configureMiddleware callback lets the entry point wire up auth, CORS, and rate limiting without the SSE module knowing about them.

Step 6: The Complete Production Entry Point#

Now src/server.ts — the hardened entry point with all middleware wired up:

// src/server.ts — Production hardened entry point
// Auth + Rate limiting + CORS + Env validation + Graceful shutdown


import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { ResourceTemplate } from "@modelcontextprotocol/sdk/server/mcp.js";
import { z } from "zod";
import express from "express";
import { GitHubClient } from "./github-client.js";
import { createSSEServer } from "./sse-server.js";
import { AuthService } from "./auth.js";
import { RateLimiter } from "./rate-limit.js";
import { corsMiddleware } from "./cors.js";
import { loadConfig } from "./env.js";


// Validate environment FIRST (fail fast)
const config = loadConfig();


// Initialize services
const github = new GitHubClient(config.githubToken);
const auth = new AuthService();
const rateLimiter = new RateLimiter(config.rateLimitMax, config.rateLimitWindowMs);
const GITHUB_API_BASE = "https://api.github.com";


const server = new McpServer({
  name: "github-issue-manager",
  version: "1.0.2",
});


// ──── Helpers ────
function parseLinkHeader(link: string | null): Record<string, string> {
  if (!link) return {};
  const result: Record<string, string> = {};
  for (const part of link.split(", ")) {
    const match = part.match(/<([^>]+)>;\s*rel="([^"]+)"/);
    if (match) result[match[2]] = match[1];
  }
  return result;
}


async function githubFetch(url: string) {
  return fetch(url, {
    headers: {
      Authorization: `Bearer ${config.githubToken}`,
      Accept: "application/vnd.github+json",
      "User-Agent": "github-issue-mcp-server/1.0",
    },
  });
}


// ──── Wire middleware ────
const instance = createSSEServer(server, config.port, (app) => {
  app.use(corsMiddleware(config.allowedOrigins));
  app.use(express.json());


  // Auth + rate limit on every request except /health
  app.use((req, res, next) => {
    if (req.path === "/health") return next();
    auth.middleware()(req, res, next);
  });
  app.use((req, res, next) => {
    if (req.path === "/health") return next();
    rateLimiter.middleware()(req, res, next);
  });


  // Clean stale rate limit buckets every 5 min
  setInterval(() => rateLimiter.cleanup(), 5 * 60 * 1000);
});


// ──── TOOLS (7) ────
server.tool("list_issues", "List issues", {
  owner: z.string(), repo: z.string(),
  state: z.enum(["open","closed","all"]).default("open"),
  limit: z.number().min(1).max(100).default(20),
}, async ({ owner, repo, state, limit }) => {
  try {
    const issues = await github.listIssues(owner, repo, state, limit);
    if (!issues.length) return { content: [{ type: "text", text: `No ${state} issues.` }] };
    const formatted = issues.map((i: any) =>
      `#${i.number}: ${i.title}\n  ${i.state} | ${i.created_at.slice(0,10)}\n  ${i.html_url}`
    ).join("\n\n");
    return { content: [{ type: "text", text: `## Issues in ${owner}/${repo} (${state})\n\n${formatted}` }] };
  } catch (e) { return { content: [{ type: "text", text: `Error: ${e}` }], isError: true }; }
});


server.tool("get_issue", "Get issue details", {
  owner: z.string(), repo: z.string(), issue_number: z.number().int().positive(),
}, async ({ owner, repo, issue_number }) => {
  try {
    const issue = await github.getIssue(owner, repo, issue_number);
    return { content: [{ type: "text", text:
      `# ${issue.title}\n**#${issue.number}** | **State:** ${issue.state}\n**URL:** ${issue.html_url}\n---\n${issue.body || "*No description*"}` }] };
  } catch (e) { return { content: [{ type: "text", text: `Error: ${e}` }], isError: true }; }
});


server.tool("create_issue", "Create issue", {
  owner: z.string(), repo: z.string(),
  title: z.string().min(1).max(256),
  body: z.string().optional(), labels: z.array(z.string()).optional(),
  assignees: z.array(z.string()).optional(),
}, async ({ owner, repo, title, body, labels, assignees }) => {
  try {
    const issue = await github.createIssue(owner, repo, { title, body, labels, assignees });
    return { content: [{ type: "text", text: `✅ Created #${issue.number}: ${issue.title}\n${issue.html_url}` }] };
  } catch (e) { return { content: [{ type: "text", text: `Error: ${e}` }], isError: true }; }
});


server.tool("update_issue", "Update issue", {
  owner: z.string(), repo: z.string(), issue_number: z.number().int().positive(),
  title: z.string().max(256).optional(), body: z.string().optional(),
  state: z.enum(["open","closed"]).optional(),
  labels: z.array(z.string()).optional(), assignees: z.array(z.string()).optional(),
}, async ({ owner, repo, issue_number, ...changes }) => {
  try {
    const issue = await github.updateIssue(owner, repo, issue_number, changes);
    return { content: [{ type: "text", text: `✅ Updated #${issue_number}\nState: ${issue.state}\n${issue.html_url}` }] };
  } catch (e) { return { content: [{ type: "text", text: `Error: ${e}` }], isError: true }; }
});


server.tool("search_issues", "Search issues", {
  query: z.string().min(1), limit: z.number().min(1).max(50).default(10),
}, async ({ query, limit }) => {
  try {
    const result = await github.searchIssues(query, limit);
    if (!result.issues.length) return { content: [{ type: "text", text: `No results for: "${query}"` }] };
    const formatted = result.issues.map((i: any) =>
      `#${i.number}: ${i.title}\n  ${i.state} | ${i.html_url}`
    ).join("\n\n");
    return { content: [{ type: "text", text: `## Results (${result.total_count} total)\n\n${formatted}` }] };
  } catch (e) { return { content: [{ type: "text", text: `Error: ${e}` }], isError: true }; }
});


server.tool("list_issues_paginated", "Paginated listing", {
  owner: z.string(), repo: z.string(),
  state: z.enum(["open","closed","all"]).default("open"),
  page: z.number().int().min(1).default(1),
  per_page: z.number().int().min(1).max(100).default(30),
  sort: z.enum(["created","updated","comments"]).default("updated"),
  direction: z.enum(["asc","desc"]).default("desc"),
}, async ({ owner, repo, state, page, per_page, sort, direction }) => {
  try {
    const url = `${GITHUB_API_BASE}/repos/${owner}/${repo}/issues?${
      new URLSearchParams({ state, page: String(page), per_page: String(per_page), sort, direction })}`;
    const res = await githubFetch(url);
    const issues: any[] = await res.json() as any[];
    const pagination = parseLinkHeader(res.headers.get("link"));
    if (!issues.length) return { content: [{ type: "text", text: `No issues page ${page}.` }] };
    const formatted = issues.map((i: any) =>
      `#${i.number}: ${i.title}\n  ${i.state} | 💬 ${i.comments}\n  ${i.html_url}`
    ).join("\n\n");
    let header = `## Issues (page ${page})`;
    if (pagination.last) header += ` — Page ${page}/${parseInt(new URL(pagination.last).searchParams.get("page") || "1")}`;
    return { content: [{ type: "text", text: `${header}\n\n${formatted}` }] };
  } catch (e) { return { content: [{ type: "text", text: `Error: ${e}` }], isError: true }; }
});


server.tool("batch_label_issues", "Batch label issues", {
  owner: z.string(), repo: z.string(),
  issue_numbers: z.array(z.number().int().positive()).min(1).max(25),
  labels: z.array(z.string()).min(1).max(10),
}, async ({ owner, repo, issue_numbers, labels }) => {
  const results: { n: number; ok: boolean; err?: string }[] = [];
  for (const n of issue_numbers) {
    try { await github.updateIssue(owner, repo, n, { labels }); results.push({ n, ok: true }); }
    catch (e) { results.push({ n, ok: false, err: String(e) }); }
  }
  const s = results.filter(r => r.ok).length;
  return { content: [{ type: "text",
    text: `## Labels: ${labels.join(", ")}\n✅ ${s}/${issue_numbers.length}${
      results.some(r => !r.ok) ? `\n❌ Failed:\n${results.filter(r => !r.ok).map(r => `- #${r.n}: ${r.err}`).join("\n")}` : ""
    }` }] };
});


// ──── RESOURCES (3) ────
server.resource("issue-detail",
  new ResourceTemplate("issue://{owner}/{repo}/{number}", { list: undefined }),
  async (uri, { owner, repo, number }) => {
    const issue = await github.getIssue(owner as string, repo as string, parseInt(number as string));
    return { contents: [{ uri: uri.href, mimeType: "text/markdown",
      text: `# ${issue.title}\n**Status:** ${issue.state === "open" ? "🟢" : "🔴"}\n**URL:** ${issue.html_url}\n---\n${issue.body || "*No description*"}` }] };
  });


server.resource("issue-comments",
  new ResourceTemplate("issue://{owner}/{repo}/{number}/comments", { list: undefined }),
  async (uri, { owner, repo, number }) => {
    const url = `${GITHUB_API_BASE}/repos/${owner}/${repo}/issues/${number}/comments`;
    const res = await githubFetch(url);
    const comments: any[] = await res.json() as any[];
    if (!comments.length) return { contents: [{ uri: uri.href, mimeType: "text/markdown", text: "*No comments*" }] };
    return { contents: [{ uri: uri.href, mimeType: "text/markdown",
      text: `# Comments\n\n${comments.map((c: any) => `---\n**@${c.user.login}** on ${new Date(c.created_at).toLocaleDateString()}\n\n${c.body || "*No text*"}`).join("\n\n")}` }] };
  });


server.resource("open-issues",
  new ResourceTemplate("issue://{owner}/{repo}/open", { list: undefined }),
  async (uri, { owner, repo }) => {
    const issues = await github.listIssues(owner as string, repo as string, "open");
    if (!issues.length) return { contents: [{ uri: uri.href, mimeType: "text/markdown", text: "✨ No open issues!" }] };
    return { contents: [{ uri: uri.href, mimeType: "text/markdown",
      text: `# Open Issues (${issues.length})\n\n${issues.map((i: any) => `- [#${i.number}](${i.html_url}): ${i.title}`).join("\n")}` }] };
  });


// ──── PROMPTS (3) ────
server.prompt("triage-issue", "Triage issue", {
  owner: z.string(), repo: z.string(), issue_number: z.number(),
}, ({ owner, repo, issue_number }) => ({
  messages: [{ role: "user", content: { type: "text",
    text: `Triage #${issue_number} in ${owner}/${repo}.\n1. Severity\n2. Labels\n3. Priority\n4. Assignee\n5. Next steps` } }],
}));


server.prompt("weekly-summary", "Weekly summary", {
  owner: z.string(), repo: z.string(),
}, ({ owner, repo }) => ({
  messages: [{ role: "user", content: { type: "text",
    text: `Weekly summary for ${owner}/${repo}.\nGroup: New | Updated | Stale (30d+).` } }],
}));


server.prompt("bug-report-template", "Bug report template", {}, () => ({
  messages: [{ role: "user", content: { type: "text",
    text: `Template:\n## Bug Report\n### Describe\n### To Reproduce\n### Expected\n### Environment` } }],
}));


// ──── Graceful shutdown ────
process.on("SIGTERM", async () => { await instance.shutdown(); process.exit(0); });
process.on("SIGINT", async () => { await instance.shutdown(); process.exit(0); });


console.error("\n🚀 github-issue-manager v1.0.2 — production hardened");
console.error("   Auth: X-API-Key | Health: /health (no auth)");

Step 7: Update package.json#

Bump version:

{
  "name": "github-issue-mcp",
  "version": "1.0.2",
  "scripts": {
    "build": "tsc",
    "start": "node build/server.js",
    "inspect": "npx @modelcontextprotocol/inspector"
  }
}

Step 8: Full Test#

Build and run:#

Terminal window
npm run build


export GITHUB_TOKEN="ghp_your_token_here"
export AUTH_KEYS="sk-mcp-1,sk-mcp-2"
export NODE_ENV=production


node build/server.js

Expected output:

✅ Config validated | Port: 3001 | Auth: 2 keys
🔑 Auth configured: 2 API key(s)
⏱️ Rate limit: 60 req / 60s
✅ MCP SSE server on port 3001
🚀 github-issue-manager v1.0.2 — production hardened

Test auth:#

Terminal window
# No key → 401
curl http://localhost:3001/sse
# {"error":"Missing X-API-Key header"}


# Wrong key → 403
curl -H "X-API-Key: wrong" http://localhost:3001/sse
# {"error":"Invalid API key"}


# Correct key → SSE opens
curl -H "X-API-Key: sk-mcp-1" http://localhost:3001/sse
# event: endpoint

Test rate limit:#

Terminal window
for i in $(seq 1 70); do
  curl -s -o /dev/null -w "%{http_code}\n" \
    -H "X-API-Key: sk-mcp-1" \
    -X POST "http://localhost:3001/messages?sessionId=test" \
    -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
done
# First 60 → 200 / After 60 → 429

Test health (no auth):#

Terminal window
curl http://localhost:3001/health
# {"status":"ok","uptime":12,"activeConnections":0}

Step 9: Docker with Auth#

Update Docker Compose:

services:
  mcp-server:
    build: .
    container_name: github-issue-mcp
    ports:
      - "127.0.0.1:3001:3001"
    environment:
      - GITHUB_TOKEN=${GITHUB_TOKEN}
      - AUTH_KEYS=${AUTH_KEYS}
      - NODE_ENV=production
      - RATE_LIMIT_MAX=60
      - RATE_LIMIT_WINDOW_MS=60000
    healthcheck:
      test: ["CMD", "wget", "--spider", "http://localhost:3001/health"]
      interval: 30s
      retries: 3
    restart: unless-stopped
    read_only: true

Run:

Terminal window
export GITHUB_TOKEN="ghp_..."
export AUTH_KEYS="sk-mcp-prod-1,sk-mcp-prod-2"
docker compose up -d

Step 10: Claude Desktop Config#

{
  "mcpServers": {
    "github-issue-manager": {
      "type": "sse",
      "url": "https://mcp.example.com/sse",
      "headers": {
        "X-API-Key": "sk-mcp-prod-1"
      }
    }
  }
}

The headers field lets you pass the API key with every request. Restart Claude Desktop — it should connect to your production-hardened server.

What You Learned#

ConceptImplementation
API key authAuthService → Express middleware → 401/403
Rate limitingSliding window → per-key buckets → 429
CORSControl origins → handle preflight OPTIONS
Env validationloadConfig() → fail fast on startup
Graceful shutdownSIGTERM/SIGINT → close transports → close HTTP
Middleware chainCORS → Body parser → Auth → Rate limit → SSE
DayTopicStatus
1Setup & Architecture✅
2Resources, Prompts & Advanced Tools✅
3SSE Transport & Docker✅
4Auth & Production Hardening✅ Done
5Testing, Publishing & EcosystemFinal

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Building an MCP Server from Scratch — Day 4: Authentication & Production Hardening
https://minixium.com/en/posts/build-mcp-server-from-scratch-day4-authentication-production-hardening/
Author
Minixium
Published at
2026-06-09
License
CC BY-NC-SA 4.0

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Building an MCP Server from Scratch — Day 5: Testing, Publishing & Ecosystem
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