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How to deploy an MCP allowlist gateway

Inventory agent tools, allowlist approved MCP servers, and log every invocation — before prod data is in scope.

TrialGovernance12 min
Agent harness · approvals

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Spec → allowlisted tools → model loop. Writes pause for human approval; MCP goes through an allowlist gateway.

When you need this

  • Developers install MCP plugins ad hoc
  • Security asks for MCP inventory
  • Agents need prod read access
  • Shadow MCP bypasses org controls

Prerequisites

  • List of IDE/agent tools in use
  • Security policy owner
  • Preferred gateway (e.g. Runlayer-managed) selected

Steps

  1. 1

    Inventory shadow MCP

    Survey teams for MCP configs in Cursor, Claude Desktop, and internal agents. Document data access per server.

  2. 2

    Define allowlist policy

    Approved servers only; deny by default. Separate dev (synthetic data) from prod (read-only, audited).

  3. 3

    Deploy gateway

    Route MCP through a managed gateway with RBAC and audit logs. Block direct prod connections from unapproved clients.

  4. 4

    Catalog skills and tools

    Publish an approved skills catalog so teams reuse vetted tools instead of inventing new MCP servers.

  5. 5

    Monitor and review quarterly

    Alert on new MCP registrations. Review tool invocation logs for anomalous patterns.

Adoption pitfalls

  • Policy memo without technical enforcement
  • Prod credentials in local MCP configs
  • No distinction between read and write tools

Adoption checklist

  • Complete MCP inventory documented
  • Allowlist enforced technically (not policy-only)
  • Audit logs retained 90+ days
  • Quarterly access review scheduled

SEER REAL assessment / sprint

Assessment inventories shadow MCP and data exposure. Sprint stands up allowlist gateway + catalog for the highest-risk agent surface.

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