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@contail/agentguard

v1.1.21

Published

The vantage point security layer for AI agents — sees every LLM, MCP, and HTTP call across every agent runtime (Cursor, Claude Desktop, OpenClaw, Hermes, custom) and correlates attacks no per-agent guardrail can

Vulnerabilities

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  • 0Medium
  • 0Low

Links

Git

Maintainers

contailcontail

Keywords

agentguardaisecurityfirewallllmproxymcpagentagent-securityguardrails

Readme

AgentGuard

Reverse Proxy Firewall + LLM Gateway for AI Agents

AgentGuard is a security layer for local autonomous AI agents. It provides inbound request filtering, LLM tool call interception, and outbound PII sanitization — all in a single Go binary with zero dependencies.

Install

npm install -g @contail/agentguard
agentguard setup

Or run directly:

npx @contail/agentguard setup

Features

  • Two-Stage Defense — 11-layer rule-based checks + optional remote trust evaluation
  • LLM Gateway — Multi-provider (OpenAI + Anthropic) tool call interception with SSE streaming support
  • MCP Security Gateway — Policy-based protection for IDE AI agents (Cursor, VS Code, Claude Desktop, Kiro)
  • Config Diagnosis — Automated security audit with auto-fix engine (7 fields)
  • PII Sanitization — Regex + entropy-based detection of emails, tokens, secrets in outbound requests
  • Safe Auto-Setup — One command configures shell RC + OpenClaw, clean undo with --undo

Usage

# Start (inbound proxy + LLM Gateway enabled by default)
agentguard

# Setup shell + OpenClaw integration
agentguard setup

# Security diagnosis + auto-fix
agentguard fix              # Preview fixable issues
agentguard fix --apply      # Apply all fixes

AI Control Web Demo

npm install -g @contail/agentguard
agentguard demo

The npm package includes the Chrome extension files. agentguard demo starts the local policy API, opens the Chrome extensions page, opens the bundled extension folder, and copies the extension path to the clipboard. In Chrome, enable Developer mode, click Load unpacked, then press Cmd+V in the file picker if needed.

To run the Chrome extension policy API and desktop app/CLI proxy together:

AGENTGUARD_GATE_URL=http://127.0.0.1:8000 \
AGENTGUARD_GATE_API_KEY='<PROJECT_API_KEY>' \
agentguard demo all --mitm

When AGENTGUARD_GATE_URL points at a local Trust Layer backend, the launcher checks the project API key before starting so audit webhook authentication errors fail fast.

Configuration

| Variable | Default | Description | |----------|---------|-------------| | AGENTGUARD_PORT | :10180 | Reverse proxy listen port | | AGENTGUARD_LLM_ENABLED | true | Enable LLM Gateway | | AGENTGUARD_LLM_PORT | :10081 | LLM Gateway listen port | | AGENTGUARD_LLM_MODE | monitor | monitor or enforce | | AGENTGUARD_LLM_PII | off | PII mode: off / monitor / sanitize / block | | AGENTGUARD_GATE_ENABLED | true | Enable Stage 2 evaluation |

Supported Platforms

  • macOS (Apple Silicon / Intel)
  • Linux (x64)
  • Windows (x64)

The npm package includes prebuilt binaries for supported platforms. The postinstall script installs the matching bundled binary automatically.

Links

License

MIT