Christian Posta • 9/16/2025

MCP Authorization Patterns for Upstream API Calls

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This technical article examines the challenge of authorizing upstream API calls from multi-tenant MCP (Model Context Protocol) servers. It discusses five patterns for securely calling external services (e.g., GitHub, Slack) on behalf of users across trust domain boundaries, analyzing their pros and cons for enterprise adoption. The content is focused on authentication, authorization, and secure communication patterns in software architecture.

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#api #mcp #oauth
MCP Authorization Patterns for Upstream API Calls

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