Runtime governance proxy for MCP tool calls. Blocks prompt injection and capability abuse before tool results reach your agent. What it does arc-gate-mcp sits between your MCP client and any MCP server. Every tool result passes through Arc Gate governance before reaching your agent — blocking prompt injection attacks that exploit the MCP trust boundary. Installation Usage With Claude Desktop Policy modes - balanced — general purpose - browser_agent — web browsing agents - finance_agent — financial data agents - rag_assistant — document retrieval agents - strict — maximum enforcement Links - Bendex Arc Platform - PyPI License AGPL-3.0 Used with Heym arc-gate-mcp is available as a template on Heym — an enterprise agent platform. Try the Governed Web Research Agent template to see Arc Gate MCP in action.