Harness agent plugin that acts as a sentinel between the AI agent and MCP servers — polling long-running tasks so token-costly status loops never enter the LLM inference path
A **sentinel** between an AI agent and MCP servers — polling long-running tasks on the agent's behalf so that token-costly status loops never enter the LLM inference path. This is a **monorepo**: a harness-agnostic core (`@gcszhn/mcp-sentinel-core`) plus one thin plugin package per agent host. **Zero MCP re-configuration.** The sentinel never asks the user to configure MCP