Ultra13
Platform · MCP Gateway

How do you secure MCP tool calls with a gateway?

An MCP / tool gateway sits in front of JSON-RPC tools/list and tools/call. It pins tool names, descriptions, and schemas; detects rug-pull drift and namespace shadowing; and enforces source-to-sink policy before any tool executes — treating MCP responses as untrusted observation, not authority.

By the Ultra13 teamPublished Updated
TL;DR
  • The gateway inspects tools/list and tools/call.
  • Pin names, descriptions, and schemas; detect drift and shadowing.
  • Enforce policy before execution.
  • MCP responses inform, but cannot authorize actions outside policy.

What the gateway enforces

Schema pinning, drift and shadowing detection, tool-result labelling, and per-call inspection of name, args, resource, identity, tenant, and side effects. Background: MCP security and tool-call inspection.

FAQ

Frequently asked questions

Where does the MCP gateway sit?
Between the agent and its MCP servers, in front of JSON-RPC tools/list and tools/call, so every tool discovery and invocation is inspected before it runs.

See where the firewall stops the path.

Give us one agent workflow. We’ll map the context boundary, replay the abuse paths, and show where the Context Firewall blocks them.

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