Most MCP security checklists stop at “is this caller authenticated? ” That is necessary, but it does not answer the operational question: what is this tool allowed to do during this run? A useful boundary is a capability budget: a short-lived, explicit contract for each tool invocation.

Source: [Dev.to](https://dev.to/zira125/your-mcp-server-needs-a-capability-budget-not-just-auth-32p6)

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