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arc-gate-mcp

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arc-gate-mcp MCP server

arc-gate-mcp MCP server

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.

Related MCP server: MCP Fetch

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

Links

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.

Install Server
A
license - permissive license
A
quality
B
maintenance

How are these scores calculated?

Maintenance

–Maintainers
–Response time
0dRelease cycle
3Releases (12mo)
Commit activity

Resources

Unclaimed servers have limited discoverability.

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