- [Design Patterns for Deploying AI Agents with Model Context Protocol](https://arxiv.org/abs/2603.13417) — March 2026 field report from an enterprise MCP deployment identifying three protocol-level gaps that break production: missing identity propagation (who is the request for?), absent adaptive tool budgeting, and unstructured error semantics. The concrete mitigation patterns — JWT-enriched tool calls, per-tool timeout contracts, and standardized error-action mappings — are essential before betting on MCP as your primary tool-integration layer.