Modern MCP agents often blow past context limits because tools return huge blobs (DOM dumps, network traces, screenshots, etc.). MCP Compact is a small proxy that sits between your agent and the upstream MCP server, forwards every tool call, and uses an LLM to summarize the response according to per-tool rules (token budget, fields to preserve/drop). It supports StreamableHTTP, tracks token usage, and can reconnect sessions, so you can keep agents focused without rewriting agent code or tools.