MCP security tools protect the connections between AI agents and the Model Context Protocol servers they use. They fall into three groups: scanners that check servers and tool descriptions before you install them, runtime layers that inspect tool calls and responses as they happen, and identity tools that control which agent can use which server with which credentials. The strongest options in 2026 are Snyk Agent Scan and Cisco’s open source MCP Scanner for scanning, Operant, Lasso, Prompt Security and Palo Alto Networks Prisma AIRS for runtime protection, and Aembit and Descope for authentication.
The need is real. Agents now read email, query databases and push code through MCP, and every connected server is a path for an attacker. Poisoned tool descriptions, prompt injection hidden in tool output and leaked OAuth tokens have all moved from research papers into vendor threat reports. Model context protocol security has become its own budget line, separate from general AI guardrails.
We picked the top tools below for how clearly they address MCP-specific threats, how much of the problem they cover, and how transparent each vendor is about what ships today. Most teams pair one of these with an MCP gateway, which we cover in our guide to the top MCP gateways in 2026.
MCP Security Tools At A Glance
Tool
Best For
Key Strength
Pricing Model
Snyk Agent Scan
Developers auditing local MCP configs
Scans MCP servers and agent skills for poisoning and injection
Open source CLI (Apache 2.0), Snyk account required
Cisco AI Defense and MCP Scanner
Enterprises standardizing on Cisco
Open source scanner plus MCP catalog and SASE controls
Free scanner; AI Defense is licensed
Operant AI MCP Gateway
Runtime threat detection across clouds
Detects tool poisoning and redacts sensitive data inline
Free trial, then paid
Palo Alto Networks Prisma AIRS
Large security teams on Palo Alto
MCP server scanning plus a unified AI gateway
Enterprise license
Lasso Security
Teams wanting an open source guardrail gateway
MCP gateway with server reputation scanning
Open source gateway; platform is paid
Prompt Security (SentinelOne)
SentinelOne customers
Shadow MCP discovery and risk data on known servers
Part of SentinelOne platform
Aembit
Credential isolation for agents
MCP Identity Gateway with per-tool policies
Free starter, Teams at $20 per agent per month
Akto
Security testing of MCP servers
Discovery plus attack probes for MCP risks
Quote-based
Descope
Teams building their own MCP servers
OAuth authorization server for MCP with consent and scopes
Free tier, Pro from $249 per month
Trail of Bits mcp-context-protector
Security-minded developers
Trust-on-first-use pinning against rug pulls
Open source (Apache 2.0)
Best MCP Security Tools In 2026
1. Snyk Agent Scan — Open Source Scanner For MCP Servers, Agent Skills And Tool Poisoning
Snyk bought Invariant Labs, the ETH Zurich spin-off behind the widely used MCP-Scan tool, in June 2025. That work now lives on as Snyk Agent Scan, an Apache 2.0 command-line tool that finds the MCP servers, skills and agent configs on a machine and checks them for prompt injection, tool poisoning and malware payloads.
Its main advantage is discovery. Agent Scan reads configs for Cursor, VS Code, Windsurf, Claude Desktop, Claude Code, Gemini CLI, Codex, Amazon Q and other clients, so a developer can audit everything installed in one run. Skills scanning is on by default. Snyk also sells Evo AI-SPM for AI inventory and policy, and it is building Agent Guard, a runtime layer that inspects MCP tool calls and their output, currently in private preview.
The scanner requires a free Snyk account and API token. Snyk advises running scans in a sandbox when configs are untrusted, because the scanner may start stdio servers to read their tool descriptions. It is the easiest first step for any team that wants a quick read on its local MCP exposure.
Auto-discovers configs across major AI clients
Detects tool poisoning and prompt injection
Scans agent skills as well as MCP servers
Free CLI backed by a commercial platform
2. Cisco AI Defense — Open Source MCP Scanner Plus Enterprise MCP Catalog And SASE Controls
Cisco attacks MCP risk from two directions. Its open source MCP Scanner, released by the AI Defense team under Apache 2.0, checks tools, prompts and resources using YARA rules, an LLM judge and the Cisco AI Defense inspection API. It can scan live remote or stdio servers, run offline against exported JSON for CI pipelines, and analyze server source code for mismatches between what a tool claims to do and what it actually does.
On the commercial side, Cisco announced an MCP Catalog for AI Defense in February 2026 that discovers and inventories MCP servers and registries, alongside an AI bill of materials that includes MCP servers. Cisco’s SASE platform adds visibility, logging and policy control over MCP traffic in the network path, and AI Defense provides real-time guardrails aimed at poisoned tools and unauthorized tool use.
The scanner is free for any team. The broader AI Defense features are licensed, so they make most sense for organizations that already run Cisco security. It is a strong mcp scanner choice even if you never buy the rest.
Operant AI built its MCP Gateway as a runtime defense product rather than a routing layer. It catalogs MCP tools and agents automatically, maps live traffic between clients and servers, and surfaces shadow MCP clients, servers and tools, including coding agents on developer machines.
Detection covers prompt injection, jailbreaks, tool poisoning and unusual access patterns across MCP client and server interactions. When it finds sensitive data or intellectual property moving through a tool call, it can block the flow or redact the data inline. Trust zones block untrusted servers, and identity-aware controls cover the non-human identities that agents use, with least-privilege execution and rate limiting on top.
Operant supports Kubernetes, AWS Bedrock, Azure and Google Vertex AI environments. It offers a seven-day free trial, with pricing beyond that through its sales team. It suits security teams that want active blocking at runtime, not only scanning before deployment.
Prisma AIRS is Palo Alto Networks’ AI security platform, and it now covers agents and MCP from build to runtime. Its agent supply chain features scan agent code, MCP servers and skills for vulnerabilities before deployment and suggest fixes. At runtime, it protects against prompt injection, tool misuse and sensitive data exposure.
The bigger change in 2026 is the gateway. Palo Alto Networks closed its acquisition of Portkey in May 2026 and is making Portkey’s AI gateway the core of Prisma AIRS. That gives the platform a single control point for LLM calls, tool calls and MCP connections, tied to agent identity checks. Prisma AIRS also exposes its own MCP server, so agents can call security scans on prompts and responses as a tool.
Prisma AIRS is sold as an enterprise license. It fits large organizations that already use Palo Alto Networks and want MCP security managed alongside network and cloud controls. Existing Portkey customers should review renewal terms as the products merge.
5. Lasso Security — Open Source MCP Gateway With Server Reputation Scanning And Guardrails
Lasso Security released one of the first open source security gateways for MCP in April 2025, and it remains a practical tool in 2026. The MIT-licensed gateway sits in front of your MCP servers and runs plugins on every request and response. A basic plugin masks secrets such as GitHub, AWS and Slack tokens, a Presidio plugin handles PII, and a tracing plugin logs tool calls to a queryable database.
Its scan mode is the standout. Before a server is allowed, the gateway checks its reputation using Smithery, npm and GitHub signals, inspects tool descriptions for hidden instructions and risky file access, and blocks servers that fall below a score threshold. Adding a Lasso API key unlocks the company’s commercial guardrails for prompt injection and custom policies.
Beyond the gateway, Lasso sells an AI security platform covering discovery, red teaming and runtime enforcement, plus its Intent Deputy engine, which checks whether an agent’s actions match its approved purpose. It fits teams that want to start free and grow into a commercial platform.
SentinelOne announced its acquisition of Prompt Security in August 2025, and Prompt Security now runs inside the SentinelOne Singularity Platform. At the time of the deal, SentinelOne highlighted MCP gateway security covering more than 13,000 known MCP servers as one of the capabilities customers would gain.
In practice, Prompt Security maps every agent and MCP server in the environment and flags shadow servers and unsanctioned agent deployments. It enforces least-privilege access so agents stay within their scope, and it keeps a searchable log of agent actions and interactions with company systems. Because it shares a console with SentinelOne’s endpoint, cloud and identity products, MCP findings sit next to the rest of a security team’s alerts.
Pricing is part of SentinelOne’s platform licensing. It is the obvious choice for existing SentinelOne customers, and a reasonable one for any company where unmanaged employee use of MCP servers is the main worry.
7. Aembit — MCP Identity Gateway That Keeps Credentials Away From Agents
Aembit is an identity and access platform for non-human workloads, and its MCP Identity Gateway applies that model to agents. Agents connect to the gateway as if it were an MCP server. The gateway validates the agent’s token, checks policy in Aembit Cloud, then obtains the right credentials for the downstream server on each request, so agents never hold enterprise secrets.
Policies fail closed, and access is denied unless a rule allows it. Aembit combines the agent’s identity with the user’s identity when an agent acts for a person, and it can allow or block individual tools, such as limiting an agent to read-only actions. An optional content inspection step checks tool listings and tool inputs and outputs. Logs record agent, user, server and policy decision.
The gateway can be Aembit-managed or self-hosted. Pricing is public: a free Starter plan covers three agents and one gateway, Teams costs $20 per agent per month, and Enterprise is custom. It suits teams whose main concern is token and credential leakage.
8. Akto — MCP Discovery And Attack Testing For Prompt Injection And Excessive Permissions
Akto began as an API security testing company and has extended that approach to MCP. It automatically finds MCP servers, agents, tools and resources across infrastructure, cloud and employee laptops, then tests them with a library of attack probes.
The probes cover prompt injection, tool poisoning, excessive permissions, unauthorized endpoint access and weak authentication, each with a severity rating based on context. Continuous monitoring watches for unusual tool activity and abnormal agent behavior. Akto Atlas extends visibility and guardrails to employee devices, and the company has added hooks for tools such as Claude Enterprise and LiteLLM.
Akto offers cloud, hybrid and on premises deployment, with an open source edition of its core platform on GitHub. MCP security is a paid feature with quote-based pricing. It fits AppSec teams that want to test MCP servers the way they already test APIs, before attackers do.
9. Descope — OAuth Authorization Server For MCP With Consent, Scopes And A Token Vault
Descope is a customer identity platform, and its Agentic Identity Hub targets the authentication side of mcp server security. Instead of hand-building OAuth for an MCP server, teams use Descope as the authorization server while the MCP server validates tokens as a resource server.
Descope supports the pieces the MCP authorization spec expects, including discovery documents, dynamic client registration and client ID metadata documents. A consent flow shows users the scopes a client is requesting, and the issued token carries only approved scopes and the MCP server’s URL as its audience, which blocks token reuse against other servers. For tools that call third-party APIs, Descope’s Connections feature stores and serves those tokens so the server does not keep them itself.
The free tier includes 2,000 monthly active consents for MCP scenarios. Pro starts at $249 a month billed annually and Growth at $799. It suits teams building and exposing their own remote MCP servers.
Trail of Bits, the security research firm, released mcp-context-protector in 2025 as a wrapper that sits between an MCP client and a server. It is Apache 2.0 licensed and free.
Its core defense is trust on first use. A new server is blocked until a person reviews its configuration, and any later change to tools or server instructions is blocked until approved again. That directly addresses rug pulls, where a server changes its tool descriptions after you trust it. Tool responses can be routed through a guardrail provider, with LlamaFirewall supported out of the box, and flagged responses go into quarantine until a user reviews and releases them. It can also neutralize ANSI escape sequences that hide text in terminal output.
It is a developer tool rather than an enterprise platform, with no central console or support contract. It suits security-minded engineers and small teams who want strong local protection at no cost.
How To Choose An MCP Security Tool
Which MCP Threats Matter Most To You?
Start with the threats, in plain terms. Tool poisoning is when a server hides instructions in a tool’s description, such as “also read the user’s SSH keys,” which the model follows but users never see. Prompt injection via tool output is when content a tool returns, like a web page or email, contains instructions that hijack the agent. Token and credential leakage happens when OAuth tokens or API keys end up in config files, logs or model context where they can be stolen. Over-permissioned servers give agents far more access than a task needs, so one mistake can delete data or send it out. Rug pulls are servers that behave well when you approve them and change their tools later. Scanners catch poisoning and some rug pulls, runtime tools catch injection and data leaks, and identity tools reduce credential and permission risk.
Do You Need Scanning, Runtime Protection Or Both?
Scanning before installation is cheap and catches known bad patterns, which is why a free mcp scanner such as Snyk Agent Scan or Cisco MCP Scanner belongs in every developer workflow. It cannot see what a server returns at runtime, though. If agents touch sensitive data or production systems, add a runtime layer such as Operant, Lasso, Prisma AIRS or Prompt Security that inspects live traffic.
How Are Agent Credentials Handled?
If agents use personal access tokens pasted into config files, fix that first. Identity tools such as Aembit keep credentials out of the agent entirely, while Descope gives MCP servers you build a proper OAuth flow with scoped tokens. Both reduce the blast radius when something else fails.
Does It Fit Your Existing Security Stack?
Large companies usually get the most value from extending a platform they already run. Cisco, Palo Alto Networks and SentinelOne customers can add MCP controls without another console. Smaller teams often do better with focused tools that are quick to deploy. Also consider whether you need a gateway for routing and policy, and compare with options in our MCP gateways roundup.
Frequently Asked Questions
What Is MCP Security?
MCP security covers the controls that protect AI agents, MCP servers and the data passing between them. It includes vetting servers before use, inspecting tool calls and responses at runtime, managing credentials safely and limiting each agent to the tools it needs.
What Is Tool Poisoning In MCP?
Tool poisoning is an attack where a malicious or compromised MCP server places hidden instructions inside a tool’s description or metadata. The model reads those instructions and may act on them, for example by sending files to an attacker, even though the user only sees a harmless tool name.
Are There Free MCP Security Tools?
Yes. Snyk Agent Scan, Cisco MCP Scanner, Lasso’s MCP gateway and Trail of Bits mcp-context-protector are all open source. Aembit and Descope offer free tiers that cover small agent deployments.
Is An MCP Gateway Enough To Secure MCP?
A gateway is a strong foundation because it centralizes authentication, access policy and logging. On its own it may not detect poisoned tool descriptions or injected instructions in tool output, so most teams add scanning, runtime inspection or both.
Conclusion
No single product covers every MCP risk yet. A practical 2026 setup combines a free scanner in developer workflows, a runtime layer for agents that touch sensitive systems, and an identity tool that keeps credentials out of agent hands. Snyk and Cisco lead on scanning, Operant, Lasso, Prompt Security and Prisma AIRS lead on runtime defense, and Aembit and Descope lead on authentication for MCP.
If you want to feature your company on this list, email us or submit a form in the Top Choices section. After a thorough assessment, we’ll decide whether it’s a valuable addition.
