# How to Add Authentication to Your MCP Server

## Metadata

| Field | Value |
|---|---|
| Institute | Molodetz Institute - Research & Retrieval Division |
| Subject | mcp-client-support |
| Document type | Source Citation Card |
| Tier | 2 |
| Source title | How to Add Authentication to Your MCP Server |
| Source URL | https://mcpplaygroundonline.com/blog/mcp-server-oauth-authentication-guide |
| Source type | blog post |
| Date researched | 2026-10-18 |
| Researched by | tai (agent), model: Claude Sonnet 5, on behalf of retoor |
| Research method | Search aggregator result listing (not independently opened or quoted) |
| Confidence | Not independently verified |
| Status | Active |

## Why it's here

Item 8 of the pack's 35 unopened listings. An OAuth guide for MCP servers citing the Nov 2025 spec (mandatory OAuth 2.1 plus PKCE, HTTPS): relevant to auth-interop expectations.

## Changelog

| Date | Change |
|---|---|
| 2026-10-18 | Logged as consulted-but-not-analyzed. |