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MCP Gateway vs Raw MCP Server: Key Differences in Policy, Limits, and Audit

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An MCP gateway acts as an intermediary layer between an agent host and an MCP server, handling policy enforcement, identity attribution, and rate limiting that a raw server cannot provide. While a raw MCP server only responds to tool listing and tool-call requests, a gateway controls who can call, how often, and at what cost. Rate limits operate at two levels — per API key to stop a single runaway agent, and per team to cap the entire fleet — with effective limits computed automatically from plan and policy minimums. Audit attribution is recorded at write time, tagging each request as MCP or REST traffic to ensure every tool call is traceable. SmartGate is cited as one implementation of this architecture, combining token control, rate limiting, and audit logging in an MCP-native design.

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