Authentication vs. Authorization in MCP: What Atlassian Rovo Shows About OAuth, API Tokens, and Tool Calls

The text explores the intricacies of authentication and authorization within Atlassian's Model Context Protocol (MCP) environment, emphasizing the differences between OAuth and API tokens. It highlights that while both methods serve to authenticate identities, they do not inherently provide fine-grained authorization for specific actions at runtime. OAuth is positioned as the primary mechanism for interactive, user-driven sessions, providing user presence and consent framing, whereas API tokens cater to non-interactive processes like CI pipelines and backend automation. The discussion underscores the importance of runtime authorization to mitigate risks associated with broad permissions, particularly in write operations that can impact workflow integrity and supply-chain security. It argues for the necessity of a dedicated policy layer, such as the Permit MCP Gateway, to evaluate each tool invocation, ensuring that actions align with specific workflow contexts and intent, thereby reducing the potential for unauthorized or unintended operations. The piece concludes by stressing the need for a comprehensive audit trail that captures identity, intent, policy, and outcome for each tool call, which is crucial for effective access governance and compliance.

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