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eni6ma

Applied scenario

MCP tool gating for side-effecting server actions

Model Context Protocol & tool hosts

Illustrative ScenarioReference organization:Illustrative MCP server estate

These Applied Scenarios are illustrative architectures, not case studies of customer deployments. Named organizations are reference points for sector and scale (they have not engaged ENI6MA for the work described). Outcomes are stated conditionally: what would be expected if an estate of this profile implemented the referenced Gate form factor and circuit variant under the reference architecture.

The problem as published

MCP standardizes tool names and schemas; it does not mint identity. If poll_headlines or write_ticket is implemented as “send a long-lived secret,” every agent improvement increases the cost of a single leak, and hosts often cannot tell which caller should be allowed to change the world.

How ENI6MA would apply

ENI6MA Gate MCP wrapper would sit in front of side-effecting tools: MCP still decides which tool runs; an envelope would decide whether the call proceeds. DEMO-HACK-style flows show challenge → respond → envelope → burn-before-validate before the application side effect.

Expected outcomes if implemented

  • Would remove ambient news/API keys from MCP client and tool paths.
  • Would reject replayed tool invocations at the nonce stage by design.
  • Would keep MCP discovery UX while making authorization cryptographic and per-call.

Reference architecture

Gate: MCP wrapper (Demo) · Circuit: hybrid · Control: ledger burn-before-validate · See /products/gate/mcp-wrapper

Absolute mechanism claims hold under the reference architecture.

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