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en What Are Access Keys For

Alexandre edited this page Jul 20, 2026 · 7 revisions

What Are Access Keys For?

Access Keys exist to stop your MCP server from being publicly callable by anyone who finds its URL. By default, a server with no key configured is open to any client that knows the address — an Access Key closes that door for clients that don't use OAuth.

Open the Arthur screen that visually supports “What Are Access Keys For?”.

Open the Arthur screen that visually supports “What Are Access Keys For?”

They're the simplest protection option: no external identity provider, no consent screen, just a value the client includes with every request. For clients that support OAuth instead, see OAuth Client.

Open the Connect tab to show the product area discussed by this wiki page.

Open the Connect tab to show the product area discussed by this wiki page

Learn more: How to Protect a Server with an Access Key.

Bring the Access Keys area into the viewport for a focused, semantic screenshot.

Bring the Access Keys area into the viewport for a focused, semantic screenshot

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