MCP Servers

arc-gate-mcp

Runtime governance proxy for MCP tool calls. Inspects tool results for prompt injection and capability abuse before they reach your agent, blocking attacks that exploit the MCP trust boundary.

README

arc-gate-mcp

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

pip install arc-gate-mcp

Usage

arc-gate-mcp --upstream "uvx mcp-server-fetch" --policy balanced

With Claude Desktop

{
  "mcpServers": {
    "arc-gate": {
      "command": "uvx",
      "args": ["arc-gate-mcp", "--upstream", "uvx mcp-server-fetch", "--policy", "browser_agent"]
    }
  }
}

Policy modes

balanced — general purpose
browser_agent — web browsing agents
finance_agent — financial data agents
rag_assistant — document retrieval agents
strict — maximum enforcement

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.

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