Free AI agent security tools (2026)
AI agent security tools that you can use without paying: open-source projects plus tools with a free plan. Here are the top 25 of 40 from the AgentScout directory.
Updated
How we picked and ranked: tools are matched by category, the pricing each maker states and what each tool says it does. They are ranked by GitHub stars as recorded on each listing (link checks 2026-10-21); tools without a tracked repo follow, by listing maturity. No paid placements.
1. Strix
Open-source AI agents that run penetration tests on your app to find and help fix security vulnerabilities.
Pricing (as stated): Open source + cloud · Mature
2. LiteLLM
Open-source AI gateway and Python SDK that calls 100+ LLM providers in the OpenAI format, with cost tracking, guardrails, load balancing and logging.
Pricing (as stated): Open source + cloud · Mature
3. Kong Gateway
Cloud-native API, LLM and MCP gateway that adds routing, auth, multi-LLM support, semantic security and MCP traffic analytics through plugins.
Pricing (as stated): Open source + cloud · Mature
4. PentAGI
Autonomous multi-agent system for running penetration testing tasks.
Pricing (as stated): Open source · Mature
5. Casdoor
Agent-first identity and access management with an MCP and agent gateway.
Pricing (as stated): Open source · Mature
6. Portkey AI Gateway
Fast open-source AI gateway that routes requests to hundreds of LLMs through one API with fallbacks, load balancing and built-in guardrails.
Pricing (as stated): Open-source gateway free to self-host; hosted Developer plan free (10k logs/mo), Production $49/mo, Enterprise custom · Mature
7. Guardrails AI
Open-source framework for validating LLM inputs and outputs with configurable guardrails.
Pricing (as stated): Open source + cloud · Mature
8. AI-Infra-Guard
Tencent's AI red-teaming platform that scans agents, skills and MCP servers for risks.
Pricing (as stated): Open source · Mature
9. Superagent
SDK for AI agent safety that blocks prompt injections and unsafe tool calls, redacts PII and secrets, and runs red-team scenarios.
Pricing (as stated): SDK free and open source (MIT); hosted service free for open-source repos; private repos: free 100 credits/month, Starter $499/mo, Growth $1,499/mo, Scale from $3,999/mo · Mature
10. Agent Governance Toolkit
Microsoft toolkit for policy enforcement, identity and sandboxing for AI agents.
Pricing (as stated): Open source · Mature
11. Failproof AI
Observability and policy enforcement for AI agent harnesses.
Pricing (as stated): Open source · Mature
12. coucou
Mac notch and phone companion that monitors your Claude Code, Codex, Cursor and Gemini CLI sessions and lets you approve permissions on the go.
Pricing (as stated): Open source · Mature
13. agentgateway
Proxy for AI agents and MCP servers with security and observability.
Pricing (as stated): Open source · Mature
14. Archestra
Enterprise AI platform with guardrails, an MCP registry, gateway and orchestrator.
Pricing (as stated): Open source + cloud · Active
15. Tracecat
Open-source security automation platform for teams and AI agents.
Pricing (as stated): Open source + cloud · Active
16. Jarvis Registry
Open-source MCP and A2A agent gateway that connects copilots and agents to enterprise tools with identity, access control and observability.
Pricing (as stated): Open source · Active
17. Mercury Agent
Self-hosted personal AI agent with a written personality, local memory, permission-gated tools and token budgets, reachable via CLI or Telegram.
Pricing (as stated): Open source · Active
18. Handsy
Lets an AI model use a real iPhone through a $7 ESP32 board that acts as a Bluetooth keyboard and mouse, tapping and typing through apps with no jailbreak and no computer attached.
Pricing (as stated): Open source · Active
19. CyberStrike
Terminal agent for authorized penetration testing that runs recon, vulnerability discovery and reporting with specialized security agents on your own LLM.
Pricing (as stated): Open source · Active
20. PentestAgent
Agent framework for black-box security testing and bug bounty work.
Pricing (as stated): Open source · Active
21. Snyk Agent Scan
Snyk's scanner for security risks in MCP servers and agent skills.
Pricing (as stated): Open source · Active
22. Mantis
Google's toolkit for AI coding agents to autonomously find, reproduce and patch software vulnerabilities in isolated environments.
Pricing (as stated): Open source · Active
23. open-kritt
A self-hosted AI security research tool that orchestrates agents to hunt for vulnerabilities in a codebase and then validate and rank what they find; managed scans are also offered.
Pricing (as stated): Open source + cloud · Active
24. ToolHive
Stacklok platform that runs MCP servers in isolated containers with per-request identity, access policy and observability.
Pricing (as stated): Open source · Active
25. Agent Safehouse
macOS sandbox for local coding agents that limits file and integration access with deny-first policy profiles.
Pricing (as stated): Open source · Active
FAQ
What are the best free AI agent security tools?
Ranked by tracked GitHub stars, the top free AI agent security tools in our directory are Strix, LiteLLM, Kong Gateway, PentAGI, Casdoor. Stars measure popularity, not fit, so compare a few against your own task.
How many free AI agent security tools does AgentScout list?
40 tools match. This page shows the top 25. Pricing mix on this page: Open source (16), Open source + cloud (8), Freemium (1).
Are these tools really free?
Pricing is what each maker states on their site. Open-source tools are free to self-host but may need a paid model API key or offer paid cloud plans; freemium tools have a free plan with limits. Check each official site.
Where can I see every tool for agent security and safety?
Our task page lists all 53 tools we match to agent security and safety.
Related: All tools for agent security and safety · security & governance (20) · agent infra (5) · MCP servers (4) · crypto (2)
By role: For DevOps and SRE engineers · For security engineers
All popular searches · AI agents by role · Free tools
Best-of lists: Strix alternatives · All best lists
Related categories: Security & governance · Agent infra · MCP servers
Facts come from our directory listings; pricing is as each maker states it and can change. Check official sites before you choose.