Ktor Server

About

The `ktor-server-mcp` library bridges the gap between the official MCP Kotlin SDK and Ktor's powerful session and authentication features. It allows developers to build robust MCP servers where tools can seamlessly access authenticated user sessions and principals. By integrating within Ktor's `authenticate {}` flow, it ensures MCP endpoints respect Ktor's security hierarchy, making it ideal for creating OAuth-protected MCP servers.

Key Features

• Designed for seamless integration with `ktor-server-oauth` for OAuth 2.0 flows.
• Provides direct access to Ktor `call.sessions` and `call.principal<T>()` within MCP tools.
• Offers an idiomatic Kotlin DSL with a clean `tool()` syntax and automatic error handling.
• 1 GitHub stars
• Works inside Ktor's `authenticate {}` blocks, respecting route hierarchy.
• Allows full passthrough access to the official MCP Kotlin SDK via `configure {}` for advanced features.

Use Cases

• Building Ktor-based MCP servers that require authenticated user sessions and principals.
• Creating secure MCP tools that access user-specific data or external APIs using user credentials.
• Developing OAuth 2.0 protected MCP servers using `ktor-server-oauth`.